Answering a Federal Complaint: Denials, Affirmative Defenses, Counterclaims, and Judgment on the Pleadings

Summary. The answer is the defendant's first pleading, and the admissions, denials, and defenses in it shape discovery, summary judgment, and trial. This article explains how a federal answer works: the response deadlines under Rules 12(a) and 81(c), the three responses Rule 8(b) permits, the line between a denial and an affirmative defense, and the waiver rules of Rules 8(c) and 12(h) that make omissions expensive. It analyzes the circuit split over whether Twombly and Iqbal govern affirmative defenses, how courts treat boilerplate defenses and Rule 12(f) motions to strike, and the defenses intellectual property defendants most often forfeit. It then covers counterclaims, including the compulsory counterclaim bar, supplemental jurisdiction, and declaratory judgment and trademark cancellation counterclaims, and explains when either side can win on the pleadings under Rule 12(c). It closes with strategy for both sides, two worked examples, an FAQ, and practical takeaways.

A software company is served with a federal complaint on a Friday afternoon. Its general counsel forwards it to outside counsel with a one-line instruction: "Deny everything; we'll sort it out in discovery." The instinct is understandable, and in federal court it is wrong in three expensive ways: a blanket denial usually violates Rules 8(b) and 11, any allegation the answer fails to deny is treated as admitted, and defenses and counterclaims the answer leaves out may never come back.

The answer looks like the least glamorous document in a lawsuit. It is also the one the defendant lives with longest. This article explains how it works in federal court: the deadline, the paragraph-by-paragraph responses, the affirmative defenses, the counterclaims, and the motion for judgment on the pleadings that tests whether any of it mattered. We write for both sides, because a plaintiff who knows how answers are built is far better at reading one.

The short answer

1. The deadline is short. A defendant served with a summons must answer within 21 days. One who waives service under Rule 4(d) gets 60 days from the date the request was sent, or 90 days if it was sent outside the United States. A Rule 12 motion suspends the deadline until 14 days after the court rules. Fed. R. Civ. P. 12(a). In removed cases, Fed. R. Civ. P. 81(c)(2) sets the clock.
2. There are only three responses. Each allegation must be admitted, denied, or met with a statement that the defendant lacks knowledge or information sufficient to form a belief about its truth. Fed. R. Civ. P. 8(b). An allegation that is not denied, other than one about the amount of damages, is admitted.
3. Affirmative defenses must be pleaded. A matter that defeats the claim even if every allegation is true must be "affirmatively state[d]" under Rule 8(c), or it is ordinarily forfeited. Many courts forgive a late assertion that causes no unfair surprise, but that forgiveness is discretionary, not a plan.
4. The pleading standard for defenses is unsettled. The Second Circuit applies Twombly's plausibility standard to affirmative defenses in a context-sensitive way; the Fifth and Ninth Circuits require fair notice. Pleading a sentence or two of facts for each defense makes the debate irrelevant.
5. Some Rule 12 defenses disappear on contact. Objections to personal jurisdiction, venue, process, and service of process are waived unless raised in the first Rule 12 motion or in the answer. Fed. R. Civ. P. 12(h)(1).
6. Compulsory counterclaims are now or never. A claim against the plaintiff that arises out of the same transaction or occurrence must be pleaded in the answer or it is barred later. Fed. R. Civ. P. 13(a).
7. Jury rights expire quietly. A jury demand must be served within 14 days after the last pleading directed to the issue. Fed. R. Civ. P. 38(b).
8. Pleadings can decide cases. Once the pleadings close, either side may move for judgment on the pleadings under Rule 12(c), and admissions in the answer are often what wins the motion.

What an answer must do: the framework in Rules 7, 8, 10, and 11

The Federal Rules allow only a short list of pleadings: a complaint, an answer to a complaint, an answer to a counterclaim designated as a counterclaim, an answer to a crossclaim, a third-party complaint and its answer, and a reply to an answer if the court orders one. Fed. R. Civ. P. 7(a). Within that scheme, the answer does three jobs.

It responds to the allegations. Rule 8(b)(1)(B) requires the defendant to "admit or deny the allegations asserted against it by an opposing party," and Rule 8(b)(2) adds that a denial "must fairly respond to the substance of the allegation."

It states defenses. Rule 8(b)(1)(A) requires the defendant to "state in short and plain terms its defenses to each claim asserted against it," and Rule 8(c)(1) requires it to "affirmatively state any avoidance or affirmative defense." A defendant may plead defenses in the alternative and even inconsistently. Rule 8(d)(2)-(3).

It asserts the defendant's own claims. Counterclaims against the plaintiff and crossclaims against codefendants travel under Rule 13; claims against nonparties who may be liable over travel under Rule 14.

The form rules are modest but enforced. Paragraphs must be numbered and limited as far as practicable to a single set of circumstances, and an exhibit attached to a pleading "is a part of the pleading for all purposes." Fed. R. Civ. P. 10(b)-(c). Counsel signs the answer under Fed. R. Civ. P. 11, which certifies that "the denials of factual contentions are warranted on the evidence or, if specifically so identified, are reasonably based on belief or a lack of information." Rule 11(b)(4).

Why the answer matters more than its reputation

Admissions bind. "Facts admitted in an answer, as in any pleading, are judicial admissions that bind the defendant throughout this litigation." Gibbs ex rel. Estate of Gibbs v. CIGNA Corp., 440 F.3d 571, 578 (2d Cir. 2006). The Ninth Circuit agrees that factual assertions in pleadings, unless amended, are "considered judicial admissions conclusively binding on the party who made them." American Title Insurance Co. v. Lacelaw Corp., 861 F.2d 224, 226 (9th Cir. 1988). The Supreme Court treats stipulated facts the same way, refusing to let a party escape a factual concession it made below. Christian Legal Society v. Martinez, 561 U.S. 661 (2010). A judicial admission is not evidence to be weighed against other evidence; it takes the fact out of the case. In a different lawsuit, the same pleading is only an evidentiary statement of a party opponent under Fed. R. Evid. 801(d)(2), which the party may try to explain.

Defenses define discovery. Discovery reaches nonprivileged matter "relevant to any party's claim or defense and proportional to the needs of the case." Fed. R. Civ. P. 26(b)(1). An unpleaded defense is a weak basis for demanding documents about it, and a pleaded defense opens the defendant's own files to discovery about the facts behind it. Every defense in the answer is both a sword and an invitation.

The judge reads it. The answer is usually the first thing the court sees from the defense. An answer full of evasions, "the document speaks for itself," and thirty boilerplate defenses tells the judge something about the defense before any motion is filed.

When the answer is due: deadlines, extensions, removal, and default

Rule 12(a) also yields to any federal statute that sets a different time, so check the statute creating the claim when the government is a party.

Counting. Fed. R. Civ. P. 6(a) excludes the day of the triggering event, counts every day including weekends and holidays, and carries a deadline that lands on a weekend or legal holiday to the next business day. Rule 6(d) adds three days only when the triggering paper was served by mail, left with the clerk, or delivered by other consented means. It does not extend the time to answer a complaint served under Rule 4, and since 2016 it does not apply to electronic service.

Partial motions to dismiss. Most courts hold that a Rule 12 motion directed at some counts suspends the time to answer the entire complaint, because piecemeal answers waste effort. A minority disagrees. In Gerlach v. Michigan Bell Telephone Co., 448 F. Supp. 1168 (E.D. Mich. 1978), the court reasoned that "[s]eparate counts are, by definition, independent bases for a lawsuit" and that the parties must proceed on the counts not challenged. The cautious course is a stipulation or order confirming that the whole answer is deferred, or a short answer to the unchallenged counts.

Extensions. Before the deadline runs, the court may extend it for good cause, with or without a motion. After it runs, an extension requires a motion and a showing of excusable neglect. Fed. R. Civ. P. 6(b)(1). Excusable neglect is an equitable judgment that weighs the danger of prejudice, the length of the delay and its effect on the proceedings, the reason for the delay, and good faith. Pioneer Investment Services Co. v. Brunswick Associates Ltd. Partnership, 507 U.S. 380 (1993). Local practice varies. Some districts let parties stipulate to a first extension that does not move a court-set date; others require a motion or a letter to chambers; many judges address the point in standing orders. A stipulation the court has not approved, in a district that requires approval, protects no one.

Removal. A defendant has 30 days after service to remove, 28 U.S.C. § 1446(b), and the clock starts with formal service, not with an emailed courtesy copy. Murphy Brothers, Inc. v. Michetti Pipe Stringing, Inc., 526 U.S. 344 (1999). After removal, "repleading is unnecessary unless the court orders it," Rule 81(c)(2), so a general denial filed under state rules before removal can remain the operative answer. Federal judges sometimes order a Rule 8(b)-compliant answer anyway, and a defendant planning counterclaims or specific affirmative defenses should consider amending to put them in federal form. For the removal mechanics, see Removal and Remand: Getting a Case to Federal Court and Keeping It There.

Default. When a defendant "has failed to plead or otherwise defend," the clerk must enter its default. Fed. R. Civ. P. 55(a). The defaulting defendant admits the plaintiff's well-pleaded allegations of fact, but a default "is not treated as an absolute confession" of liability, and conclusions of law are not admitted. Nishimatsu Construction Co. v. Houston National Bank, 515 F.2d 1200, 1206 (5th Cir. 1975). An entry of default may be set aside for good cause under Rule 55(c), and a default judgment under Fed. R. Civ. P. 60(b). Courts weigh whether the defendant's culpable conduct caused the default, whether it has a meritorious defense, and whether reopening would prejudice the plaintiff. TCI Group Life Insurance Plan v. Knoebber, 244 F.3d 691 (9th Cir. 2001). The Second Circuit resolves doubts in favor of the defaulting party and treats default as a last resort rather than a first sanction. Enron Oil Corp. v. Diakuhara, 10 F.3d 90 (2d Cir. 1993). The practical lesson: a late answer filed with a short motion explaining the delay almost always beats a default followed by a motion to vacate.

How to respond to each allegation under Rule 8(b)

Rule 8(b) gives the defendant exactly three tools, and most answer-drafting mistakes come from trying to invent a fourth.

Admissions and partial denials

Admit what is true. It costs little, builds credibility with the judge, and narrows discovery. But admit precisely. If paragraph 12 says "Defendant signed the License Agreement attached as Exhibit A, which required it to pay royalties on all units sold," the right answer admits signing the attached agreement and denies the paraphrase of its terms. Rule 8(b)(4) requires exactly that: a party that intends in good faith to deny only part of an allegation "must admit the part that is true and deny the rest." A denial "must fairly respond to the substance of the allegation," Rule 8(b)(2), so a defendant cannot deny a paragraph because one adjective is wrong. The common formula, "admits that X and otherwise denies the allegations of paragraph 12," works in most courtrooms, although a few judges want the defendant to identify what it denies rather than relying on "otherwise denies."

General denials

Rule 8(b)(3) permits a general denial only by a party that intends in good faith to deny every allegation of the pleading, including the jurisdictional grounds. In federal court that describes almost no one, and a general denial of facts the defendant knows to be true is a Rule 11 problem. The habit comes from state practice. California allows a general denial of an unverified complaint (Cal. Code Civ. Proc. § 431.30(d)), and Texas allows a general denial (Tex. R. Civ. P. 92) while requiring certain pleas to be verified (Tex. R. Civ. P. 93). Rule 8(b)(3) does allow a defendant to "generally deny all except those [allegations] specifically admitted," which is why well-drafted federal answers end the responses with a catch-all denial of anything not expressly admitted, including headings, footnotes, and the prayer for relief.

Lack of knowledge or information

Under Rule 8(b)(5), a party that "lacks knowledge or information sufficient to form a belief about the truth of an allegation must so state, and the statement has the effect of a denial." Two limits apply. First, the statement must be true after reasonable inquiry. A defendant cannot plead ignorance of its own contracts, its own website, or a public registration it could pull in five minutes, and courts treat such responses as admissions or order repleading. Wright & Miller, Federal Practice and Procedure §§ 1261-1265, collects the cases. Second, use the rule's words. Judge Shadur of the Northern District of Illinois spent years correcting answers that departed from Rule 8(b)'s "plain roadmap," noting that it permits only three responses and that a "demand" for "strict proof" is unknown to federal practice. King Vision Pay Per View, Ltd. v. J.C. Dimitri's Restaurant, Inc., 180 F.R.D. 332 (N.D. Ill. 1998).

"The document speaks for itself" and "legal conclusions require no response"

Judges who police answers reject both dodges. A response that a document "speaks for itself" is "insufficient and contrary to the Federal Rules of Civil Procedure," and a response that an allegation calls for a legal conclusion does not satisfy Rule 8(b). State Farm Mutual Automobile Insurance Co. v. Riley, 199 F.R.D. 276, 278-79 (N.D. Ill. 2001). The fix is easy: admit that the document exists and contains the quoted words, deny the plaintiff's characterization, and refer the court to the document for its full contents. For legal conclusions, many judges tolerate "states a legal conclusion to which no response is required," but the safer formula adds "to the extent a response is required, denied." The penalty for getting it wrong ranges from an order to replead to a ruling that the allegation stands admitted.

The silent admission: Rule 8(b)(6)

Under Rule 8(b)(6), an allegation other than one about the amount of damages "is admitted if a responsive pleading is required and the allegation is not denied." The usual victims are unnumbered introductory paragraphs, headings that state facts, footnotes, and allegations buried in exhibits incorporated by reference. Answer every numbered paragraph, then deny everything not expressly admitted.

Jurisdictional allegations and citizenship

Answer them. Parties cannot create subject matter jurisdiction by admission, Insurance Corp. of Ireland v. Compagnie des Bauxites de Guinee, 456 U.S. 694 (1982), so admitting a jurisdictional paragraph does not prevent a later challenge under Rule 12(h)(3). But factual admissions about citizenship, principal place of business, and amount in controversy will be used against the defendant. A corporation's principal place of business is its "nerve center," Hertz Corp. v. Friend, 559 U.S. 77 (2010), while partnerships and other unincorporated entities take the citizenship of every member. Carden v. Arkoma Associates, 494 U.S. 185 (1990); Americold Realty Trust v. ConAgra Foods, Inc., 577 U.S. 378 (2016). Personal jurisdiction is different: it protects an individual liberty interest and can be waived, Insurance Corp. of Ireland, so an answer that admits the court "has personal jurisdiction over Defendant" and omits the defense forfeits it.

Special matters under Rule 9

Fed. R. Civ. P. 9 changes the default rules for three subjects that matter in commercial and IP cases.

• Capacity. A party that challenges another's capacity to sue or be sued must do so by a specific denial stating any supporting facts peculiarly within its knowledge. Rule 9(a)(2). A capacity defense not raised that way is waived. Summers v. Interstate Tractor & Equipment Co., 466 F.2d 42 (9th Cir. 1972).
• Conditions precedent. A plaintiff may allege generally that all conditions precedent have occurred, but a denial "must be made with particularity." Rule 9(c). If the defendant does not deny satisfaction of the conditions specifically and with particularity, the allegations are assumed admitted and cannot later be attacked. Jackson v. Seaboard Coast Line Railroad, 678 F.2d 992 (11th Cir. 1982). In licensing disputes this is the rule that preserves notice-and-cure arguments.
• Fraud. An affirmative defense of fraud must meet Rule 9(b)'s particularity requirement, just as a fraud claim must. Wright & Miller, Federal Practice and Procedure § 1297.

Denials versus affirmative defenses: the leading cases explained

A denial says "that did not happen" or "that element is missing." An affirmative defense says "even if it happened, the plaintiff loses." The distinction controls three things: who bears the burden of proof, whether the matter must be pleaded, and whether leaving it out waives it.

Rule 8(c)(1) lists eighteen affirmative defenses: accord and satisfaction, arbitration and award, assumption of risk, contributory negligence, duress, estoppel, failure of consideration, fraud, illegality, injury by fellow servant, laches, license, payment, release, res judicata, statute of frauds, statute of limitations, and waiver. The list begins with "including," so it is illustrative, not exhaustive. (Discharge in bankruptcy was removed in 2010 because the Bankruptcy Code itself voids judgments on discharged debts.) For unlisted matters, courts ask whether the defendant bears the burden of proof on the issue and whether the defense controverts the plaintiff's prima facie case or instead avoids it. Winforge, Inc. v. Coachmen Industries, Inc., 691 F.3d 856, 872 (7th Cir. 2012). The Ninth Circuit states the converse: "[a] defense which demonstrates that plaintiff has not met its burden of proof is not an affirmative defense." Zivkovic v. Southern California Edison Co., 302 F.3d 1080 (9th Cir. 2002).

Gomez v. Toledo: the defendant pleads it; the plaintiff need not anticipate it. A public employee suing under 42 U.S.C. § 1983 did not have to allege that the official acted in bad faith. Qualified immunity is a defense the official must plead, in part because the facts supporting it are peculiarly within the official's knowledge. Gomez v. Toledo, 446 U.S. 635 (1980). Complaints need not plead around affirmative defenses; answers must plead them.

Jones v. Bock: the burden stays put, but a complaint can plead itself out of court. Failure to exhaust under the Prison Litigation Reform Act, 42 U.S.C. § 1997e(a), is an affirmative defense, so prisoners need not plead exhaustion. Jones v. Bock, 549 U.S. 199 (2007). The Court added that whether a ground supports dismissal for failure to state a claim "depends on whether the allegations in the complaint suffice to establish that ground, not on the nature of the ground in the abstract." A complaint that shows on its face that the claim is time-barred can be dismissed on the pleadings even though limitations is an affirmative defense.

Taylor v. Sturgell and Arizona v. California: preclusion is the defendant's to raise. Claim and issue preclusion are affirmative defenses, and the party asserting preclusion bears the burden. Taylor v. Sturgell, 553 U.S. 880 (2008). Res judicata is "ordinarily lost if not timely raised," and a court raises it on its own only in special circumstances, such as when the court itself previously decided the issue. Arizona v. California, 530 U.S. 392 (2000). For the doctrine, see Res Judicata, Collateral Estoppel, and the Preclusive Effect of Judgments.

Day v. McDonough and Wood v. Milyard: forfeiture is not waiver. In Day, the State miscalculated a habeas limitations period and failed to assert it; the Court held a district court may raise the time bar on its own after giving the parties notice and an opportunity to respond. Day v. McDonough, 547 U.S. 198 (2006). In Wood, the State told the court it would "not challenge, but [was] not conceding" timeliness. That deliberate choice was a waiver, and the court of appeals abused its discretion by resurrecting the defense. Wood v. Milyard, 566 U.S. 463 (2012). The Court's working definitions: forfeiture is "the failure to make the timely assertion of a right," while waiver is the intentional relinquishment of a known right. Hamer v. Neighborhood Housing Services of Chicago, 583 U.S. 17 (2017). Courts forgive forfeitures far more readily than waivers, which is a reason never to concede, in an answer, a defense the client has not yet investigated.

Arbaugh, Fort Bend, and the shrinking category of jurisdictional defenses. Defendants once held statutory prerequisites in reserve on the theory that they were jurisdictional and could be raised at any time. The Supreme Court has spent two decades narrowing that category. Title VII's employee-numerosity requirement is an element of the claim, not a jurisdictional limit, so the objection that the complaint fails to state a claim on that ground "endures up to, but not beyond, trial on the merits." Arbaugh v. Y & H Corp., 546 U.S. 500 (2006). Title VII's charge-filing requirement is a mandatory claim-processing rule, forfeited if tardily asserted. Fort Bend County v. Davis, 587 U.S. 541 (2019). The Copyright Act's registration prerequisite, 17 U.S.C. § 411(a), is not jurisdictional either. Reed Elsevier, Inc. v. Muchnick, 559 U.S. 154 (2010). Deadlines found only in court rules are claim-processing rules, Kontrick v. Ryan, 540 U.S. 443 (2004); Eberhart v. United States, 546 U.S. 12 (2005), and the trend has reached statutory time limits on suits against the government. Wilkins v. United States, 598 U.S. 152 (2023); Harrow v. Department of Defense, 601 U.S. 480 (2024). The main survivors are statutory appeal deadlines. Bowles v. Russell, 551 U.S. 205 (2007). The lesson for answer drafting is blunt: if the defense is not jurisdictional, and most are not, plead it or risk losing it.

Burdens follow the doctrine, so the label matters. Fair use is an affirmative defense on which the proponent bears the burden. Campbell v. Acuff-Rose Music, Inc., 510 U.S. 569, 590 (1994). Possession of a license "traditionally has been characterized as a matter of affirmative defense," but when the parties dispute only the scope of an admitted license, the copyright owner must prove the use was unauthorized. Bourne v. Walt Disney Co., 68 F.3d 621, 631 (2d Cir. 1995); Graham v. James, 144 F.3d 229 (2d Cir. 1998). A trademark defendant asserting classic fair use under 15 U.S.C. § 1115(b)(4) has no burden to negate confusion, which remains the plaintiff's burden. KP Permanent Make-Up, Inc. v. Lasting Impression I, Inc., 543 U.S. 111 (2004). Nominative fair use is not an affirmative defense at all in the Ninth Circuit, which substitutes it for the usual confusion factors and leaves the burden on the plaintiff, Toyota Motor Sales, U.S.A., Inc. v. Tabari, 610 F.3d 1171 (9th Cir. 2010), or in the Second Circuit, which weighs it alongside the Polaroid factors. International Information Systems Security Certification Consortium, Inc. v. Security University, LLC, 823 F.3d 153 (2d Cir. 2016). Plead it anyway. Mislabeling rarely costs anything: Rule 8(e) requires pleadings to be construed so as to do justice, courts routinely treat a denial pleaded as an affirmative defense as a denial, and Rule 8(c)(2) separately rescues a defense mislabeled as a counterclaim, or the reverse. The trademark side of this is developed in Trademark Fair Use: Descriptive Use, Nominative Use, and Expressive Works After Jack Daniel's.

Do Twombly and Iqbal apply to affirmative defenses? How the circuits differ

Bell Atlantic Corp. v. Twombly, 550 U.S. 544 (2007), and Ashcroft v. Iqbal, 556 U.S. 662 (2009), require a complaint to plead facts that make a claim plausible, retiring the "no set of facts" formulation of Conley v. Gibson, 355 U.S. 41 (1957). Whether affirmative defenses must clear the same bar has divided courts ever since.

The textual argument against applying plausibility is that Rule 8(a)(2) requires "a short and plain statement of the claim showing that the pleader is entitled to relief," and Twombly built its standard on that word, while Rule 8(b)(1)(A) asks a defendant only to "state in short and plain terms its defenses" and Rule 8(c) asks it to "affirmatively state" them. The fairness argument is about time: "Plaintiffs can prepare their complaints over years, limited only by the statute of limitations, whereas defendants have only twenty-one days to file their answers." Lane v. Page, 272 F.R.D. 581 (D.N.M. 2011). The arguments for plausibility are that boilerplate defenses waste discovery and that notice means little without facts. HCRI TRS Acquirer, LLC v. Iwer, 708 F. Supp. 2d 687 (N.D. Ohio 2010); Barnes v. AT&T Pension Benefit Plan-Nonbargained Program, 718 F. Supp. 2d 1167 (N.D. Cal. 2010) (reporting in 2010 that "the vast majority of courts presented with the issue" had extended Twombly to affirmative defenses).

Second Circuit. In GEOMC Co. v. Calmare Therapeutics Inc., 918 F.3d 92 (2d Cir. 2019), the court held that "the plausibility standard of Twombly applies to determining the sufficiency of all pleadings, including the pleading of an affirmative defense," but stressed that applying it is a context-specific task. The context includes the short time a defendant has to answer and whether the facts behind the defense are readily available. A limitations defense usually rests on dates the defendant knows; a defense that depends on the plaintiff's internal conduct may not, and the standard relaxes accordingly. The posture in which the defense arrives, including a late amendment, also matters.

Fifth Circuit. A defendant "must plead an affirmative defense with enough specificity or factual particularity to give the plaintiff 'fair notice' of the defense that is being advanced," although "in some cases, merely pleading the name of the affirmative defense ... may be sufficient." Woodfield v. Bowman, 193 F.3d 354, 362 (5th Cir. 1999). The court kept the fair-notice formulation after Twombly. LSREF2 Baron, L.L.C. v. Tauch, 751 F.3d 394 (5th Cir. 2014). The point of the rule, in the Fifth Circuit's phrase, is that a defendant should not be permitted to "lie behind a log" and ambush the plaintiff with an unexpected defense. Rogers v. McDorman, 521 F.3d 381 (5th Cir. 2008).

Seventh Circuit. "Affirmative defenses are pleadings and, therefore, are subject to all pleading requirements of the Federal Rules of Civil Procedure." Heller Financial, Inc. v. Midwhey Powder Co., 883 F.2d 1286, 1294 (7th Cir. 1989). Heller approved striking defenses that were "nothing but bare bones conclusory allegations." District courts in the circuit disagree about whether that approach incorporates Twombly or simply requires notice.

Eighth Circuit. An answer asserting that the claims were barred by "the applicable statute of limitations" sufficiently raised the defense. Zotos v. Lindbergh School District, 121 F.3d 356 (8th Cir. 1997).

Ninth Circuit. "[T]he 'fair notice' required by the pleading standards only requires describing the defense in 'general terms.'" Kohler v. Flava Enterprises, Inc., 779 F.3d 1016, 1019 (9th Cir. 2015). An answer alleging that a store met accessibility requirements through "alternative methods" adequately invoked the regulatory "equivalent facilitation" defense. The older rule was the same: "The key to determining the sufficiency of pleading an affirmative defense is whether it gives plaintiff fair notice of the defense." Wyshak v. City National Bank, 607 F.2d 824, 827 (9th Cir. 1979). Some district courts in the circuit still apply Twombly, reasoning that Kohler did not squarely decide the question; others, such as Kohler v. Staples the Office Superstore, LLC, 291 F.R.D. 464 (S.D. Cal. 2013), never did.

Elsewhere. Hayne v. Green Ford Sales, Inc., 263 F.R.D. 647 (D. Kan. 2009), applied Twombly and struck conclusory defenses with leave to amend. Lane v. Page declined, relying on the text and on the old Official Form 30, which modeled an affirmative defense in one conclusory sentence. The Official Forms were abrogated along with Fed. R. Civ. P. 84 in 2015, which removed one leg of that argument; the textual and fairness arguments remain.

What this means in practice. In every circuit, two or three sentences of facts per defense cost an hour and eliminate the motion. Where facts are still unknown, Rule 11(b)(3) allows a factual contention that "will likely have evidentiary support after a reasonable opportunity for further investigation or discovery," if the pleading specifically identifies it as such. A defense pleaded that way gives notice, survives the plausibility debate, and is honest about what the defendant knows on day 21.

Boilerplate defenses, reservations of rights, and motions to strike

Every litigator has seen the form answer: thirty numbered "affirmative defenses," each a single sentence, several of them inapplicable (assumption of risk in a trademark case, contributory negligence in a software license dispute), ending with a reservation of "the right to assert additional defenses as discovery proceeds." It has three problems.

1. Rule 11. Each defense is a legal and factual contention certified under Rule 11(b). A defense with no factual basis is sanctionable in principle, even if sanctions motions over answers are rare. See Rule 11 and Inherent-Power Sanctions: The Safe Harbor, Fee Awards, and Attorney Conduct.
2. Non-defenses. "Failure to state a claim" is not an affirmative defense; it is a Rule 12(h)(2) defense that an answer may preserve. Denials of elements ("no damages," "no likelihood of confusion") are not affirmative defenses either. Most courts leave mislabeled defenses alone, reasoning that calling a defense "affirmative" when it is not does not make it legally insufficient. Kohler v. Staples, 291 F.R.D. 464.
3. Reservations. "A reservation of unpled defenses is not a defense of any kind, much less an affirmative one." Lane, 272 F.R.D. 581. Adding a defense later requires an amendment under Rule 15 whatever the answer says.

How Rule 12(f) works

Rule 12(f) lets a court strike "an insufficient defense or any redundant, immaterial, impertinent, or scandalous matter," on its own or on a motion made within 21 days after service of the pleading. Motions to strike are disfavored: striking a pleading is a drastic remedy, and the motion is often a delay tactic. Lane, 272 F.R.D. 581. But when such motions "remove unnecessary clutter from the case, they serve to expedite, not delay." Heller, 883 F.2d at 1294. The Ninth Circuit affirmed striking lengthy, stale, previously litigated allegations, defining immaterial matter as that which "has no essential or important relationship to the claim for relief or the defenses being plead[ed]." Fantasy, Inc. v. Fogerty, 984 F.2d 1524 (9th Cir. 1993), rev'd on other grounds, Fogerty v. Fantasy, Inc., 510 U.S. 517 (1994). The Second Circuit approved striking references to a consent judgment, which adjudicated nothing. Lipsky v. Commonwealth United Corp., 551 F.2d 887 (2d Cir. 1976). And Rule 12(f) is not a substitute for a dispositive motion: it does not authorize striking a claim for damages on the ground that the damages are barred as a matter of law. Whittlestone, Inc. v. Handi-Craft Co., 618 F.3d 970 (9th Cir. 2010). Wright & Miller, Federal Practice and Procedure § 1380, surveys the practice.

For plaintiffs, a motion to strike is worth filing only against defenses that change discovery or shift burdens: an unclean hands defense that would open the plaintiff's licensing history, or a fraud defense pleaded without particulars. Expect leave to amend; courts freely grant it unless the plaintiff would be prejudiced. A meet-and-confer letter and a contention interrogatory often get the same result for less money. For defendants, prune before the plaintiff asks. A twelve-defense answer with facts reads as a serious defense; a thirty-defense answer reads as a form.

Which defenses are waived if you leave them out, and how courts forgive

Three waiver regimes operate at once, and they could hardly be more different.

Rule 12(h)(1) is strict. Personal jurisdiction, venue, process, and service objections are waived if left out of a Rule 12 motion that raised other defenses, or if neither made by motion nor included in the answer or an amendment allowed as a matter of course. There is no prejudice requirement. A defendant that answers on the merits and forgets personal jurisdiction has consented to it. For the jurisdictional analysis itself, see Personal Jurisdiction Over Online and Foreign Defendants: From Zippo to Ford Motor.

Rule 12(g)(2) consolidates, and Rule 12(h)(2) forgives. A party that makes a Rule 12 motion "must not make another motion under this rule raising a defense or objection that was available to the party but omitted from its earlier motion." But failure to state a claim, failure to join a required party under Rule 19, and failure to state a legal defense survive; they may be raised in any pleading, by Rule 12(c) motion, or at trial. A defendant that forgot a Rule 12(b)(6) argument should put it in the answer and raise it under Rule 12(c). The Third Circuit held that a district court erred by entertaining a successive Rule 12(b)(6) motion, but found the error harmless because the same argument could have come by Rule 12(c). Leyse v. Bank of America National Ass'n, 804 F.3d 316 (3d Cir. 2015). The Ninth Circuit told reviewing courts to "be forgiving" of district courts that decide late Rule 12(b)(6) motions on the merits, because forcing the argument into a later motion "can produce unnecessary and costly delays." In re Apple iPhone Antitrust Litigation, 846 F.3d 313 (9th Cir. 2017).

Rule 8(c) is usually forgiving, but not always. The baseline is clear: "a party's failure to plead an affirmative defense generally results in the waiver of that defense and its exclusion from the case." Kapche v. Holder, 677 F.3d 454 (D.C. Cir. 2012). The D.C. Circuit requires a party to raise an affirmative defense in a responsive pleading before raising it in a dispositive motion, leaving amendment as the route. Harris v. Secretary, U.S. Department of Veterans Affairs, 126 F.3d 339 (D.C. Cir. 1997). And the Fifth Circuit held that the United States waived a state statutory cap on malpractice damages by raising it for the first time after trial, because the plaintiffs would have tried their damages case differently had they known. Ingraham v. United States, 808 F.2d 1075 (5th Cir. 1987).

Most circuits, however, ask whether the defense surfaced at a pragmatically sufficient time and without unfair prejudice:

• A damages cap raised at trial as a purely legal issue was not waived. Lucas v. United States, 807 F.2d 414 (5th Cir. 1986).
• A district court "may still entertain affirmative defenses at the summary judgment stage in the absence of undue prejudice to the plaintiff, bad faith or dilatory motive on the part of the defendant, futility, or undue delay of the proceedings." Saks v. Franklin Covey Co., 316 F.3d 337, 350 (2d Cir. 2003).
• Raising a defense in a summary judgment motion can constructively amend the answer if the plaintiff is not prejudiced. Ahmad v. Furlong, 435 F.3d 1196 (10th Cir. 2006); Magana v. Commonwealth of the Northern Mariana Islands, 107 F.3d 1436 (9th Cir. 1997); Moore, Owen, Thomas & Co. v. Coffey, 992 F.2d 1439 (6th Cir. 1993).
• Qualified immunity first raised at summary judgment is not automatically waived. Eddy v. Virgin Islands Water & Power Authority, 256 F.3d 204 (3d Cir. 2001).
• A plaintiff with notice that the defense would be tried suffers no prejudice from the pleading defect. Hassan v. U.S. Postal Service, 842 F.2d 260 (11th Cir. 1988).
• A limitations defense raised in a motion to dismiss was not waived by its absence from the answer. Blaney v. United States, 34 F.3d 509 (7th Cir. 1994). But the same defense raised for the first time in a reply memorandum filed the night before oral argument came too late, because the plaintiff had no fair chance to respond. Venters v. City of Delphi, 123 F.3d 956 (7th Cir. 1997).

The thread running through these cases is notice. "The purpose of Rule 8(c) is to give the court and the other parties fair warning that a particular line of defense will be pursued." Williams v. Ashland Engineering Co., 45 F.3d 588 (1st Cir. 1995).

The safest rescue is amendment. Leave should be freely given "when justice so requires," Fed. R. Civ. P. 15(a)(2), and is denied for undue delay, bad faith or dilatory motive, repeated failure to cure, undue prejudice, or futility. Foman v. Davis, 371 U.S. 178 (1962); Wright & Miller, Federal Practice and Procedure § 1487. After the scheduling order's deadline for amending pleadings passes, the defendant must first show good cause under Fed. R. Civ. P. 16(b)(4), which turns on diligence; carelessness "offers no reason for a grant of relief." Johnson v. Mammoth Recreations, Inc., 975 F.2d 604, 609 (9th Cir. 1992); Sosa v. Airprint Systems, Inc., 133 F.3d 1417 (11th Cir. 1998); Leary v. Daeschner, 349 F.3d 888 (6th Cir. 2003). When a defense becomes apparent only in discovery, the defendant's job is to assert it promptly once it does. Venters, 123 F.3d 956.

Defenses intellectual property defendants must plead

IP statutes add defenses of their own, several with special pleading rules. The table below sorts the ones most often lost or mishandled.

A few points deserve emphasis.

Plead invalidity twice. An invalidity defense dies with a finding of noninfringement; a counterclaim for a declaration of invalidity does not, and an appellate affirmance of noninfringement does not moot it. Cardinal Chemical Co. v. Morton International, Inc., 508 U.S. 83 (1993). Section 282(c) separately requires notice of prior art at least 30 days before trial, and local patent rules require invalidity contentions on their own schedule; neither substitutes for pleading the defense.

Laches is mostly gone from damages claims. Laches cannot bar damages for infringement within the Copyright Act's three-year window, Petrella, or the Patent Act's six-year damages period in 35 U.S.C. § 286, SCA Hygiene. It survives in trademark cases, where the Lanham Act has no limitations period and courts borrow the analogous state period to decide which side bears the burden on delay. Jarrow. Equitable estoppel, which requires misleading conduct and reliance rather than delay alone, remains available in patent cases. For the full treatment, see Understanding Equitable Defenses: A Comprehensive Guide to Laches, Acquiescence, Waiver, and Equitable Estoppel.

Copyright's registration rules are defenses, not jurisdiction. Because Reed Elsevier held § 411(a) nonjurisdictional, a defendant that wants to argue the plaintiff sued before the Copyright Office acted must say so. The same is true of a challenge to a registration's accuracy under § 411(b), which after Unicolors requires facts showing the applicant actually knew the information was inaccurate, whether the mistake was one of fact or of law.

Standing comes in two kinds. Article III standing is jurisdictional and can be raised at any time. So-called statutory standing, meaning whether the plaintiff falls within the class Congress authorized to sue, is a merits question about the cause of action. Lexmark International, Inc. v. Static Control Components, Inc., 572 U.S. 118 (2014). Plead it, or raise it as failure to state a claim. For copyright, only the legal or beneficial owner of an exclusive right may sue. 17 U.S.C. § 501(b).

Arbitration needs a motion, not just a defense. "Arbitration and award" in Rule 8(c) refers to a completed arbitration. A defendant with an arbitration agreement should move to compel under 9 U.S.C. §§ 3-4 promptly, because litigating on the merits can waive the right, and no showing of prejudice is required. Morgan v. Sundance, Inc., 596 U.S. 411 (2022). When a court finds the dispute arbitrable and a party asks for a stay, the court must stay rather than dismiss, Smith v. Spizzirri, 601 U.S. 472 (2024), and an appeal from the denial of a motion to compel stays the district court case. Coinbase, Inc. v. Bielski, 599 U.S. 736 (2023).

Counterclaims: compulsory, permissive, and lost

The compulsory counterclaim rule

A pleading "must state as a counterclaim any claim" that the pleader has against an opposing party when the pleading is served, if the claim "arises out of the transaction or occurrence that is the subject matter of the opposing party's claim" and does not require adding a party over whom the court cannot acquire jurisdiction. Fed. R. Civ. P. 13(a)(1). Two exceptions: the claim was already the subject of another pending action when this one was commenced, or the plaintiff sued by attachment or other process that did not establish personal jurisdiction and the defendant asserts no counterclaim. Rule 13(a)(2).

"Transaction" is read broadly. It "may comprehend a series of many occurrences, depending not so much upon the immediateness of their connection as upon their logical relationship." Moore v. New York Cotton Exchange, 270 U.S. 593, 610 (1926). The Third Circuit's version asks whether separate trials "would involve a substantial duplication of effort and time by the parties and the courts," and whether the claims are "offshoots of the same basic controversy." Great Lakes Rubber Corp. v. Herbert Cooper Co., 286 F.2d 631 (3d Cir. 1961). The Fourth Circuit asks four questions (same issues of fact and law, res judicata effect, same evidence, logical relationship) and does not require a yes to all of them. Painter v. Harvey, 863 F.2d 329 (4th Cir. 1988). Courts also note "the close connection between Rule 13(a) and the doctrine of claim preclusion." Transamerica Occidental Life Insurance Co. v. Aviation Office of America, Inc., 292 F.3d 384 (3d Cir. 2002); see 6 Wright & Miller, Federal Practice and Procedure §§ 1409-1417; Restatement (Second) of Judgments § 22.

The consequence of omission is preclusion: "[a] counterclaim which is compulsory but is not brought is thereafter barred." Baker v. Gold Seal Liquors, Inc., 417 U.S. 467, 469 n.1 (1974). The rule exists "to prevent multiplicity of actions and to achieve resolution in a single lawsuit of all disputes arising out of common matters." Southern Construction Co. v. Pickard, 371 U.S. 57, 60 (1962). Applications in IP and commercial cases are unforgiving:

• Antitrust claims premised on the patentee's alleged misuse of its patent were compulsory counterclaims in the earlier infringement suit and were barred. Critical-Vac Filtration Corp. v. Minuteman International, Inc., 233 F.3d 697 (2d Cir. 2000).
• When a declaratory judgment plaintiff seeks a declaration of noninfringement, the patentee's infringement claim on the same patent and product is a compulsory counterclaim. Vivid Technologies, Inc. v. American Science & Engineering, Inc., 200 F.3d 795 (Fed. Cir. 1999); Polymer Industrial Products Co. v. Bridgestone/Firestone, Inc., 347 F.3d 935 (Fed. Cir. 2003).
• An abuse of process claim is a compulsory counterclaim in the allegedly abusive action. Pochiro v. Prudential Insurance Co. of America, 827 F.2d 1246 (9th Cir. 1987).
• A forum selection clause can override the rule: a party cannot be barred from the agreed forum because it did not counterclaim elsewhere. As the Seventh Circuit put it, no one is literally compelled to plead a compulsory counterclaim; only a litigant that wants to avoid a later bar must. Publicis Communication v. True North Communications Inc., 132 F.3d 363 (7th Cir. 1997).

Permissive counterclaims and supplemental jurisdiction

Any other claim against an opposing party is permissive. Rule 13(b). It may be pleaded, but needs a jurisdictional basis. Older cases required an independent basis for permissive counterclaims. Several circuits now hold that 28 U.S.C. § 1367 displaced that rule: a permissive counterclaim is within supplemental jurisdiction if it forms part of the same Article III case or controversy, a test broader than "transaction or occurrence." Jones v. Ford Motor Credit Co., 358 F.3d 205 (2d Cir. 2004); Channell v. Citicorp National Services, Inc., 89 F.3d 379 (7th Cir. 1996); Global NAPs, Inc. v. Verizon New England Inc., 603 F.3d 71 (1st Cir. 2010). The constitutional test is the familiar "common nucleus of operative fact," United Mine Workers v. Gibbs, 383 U.S. 715 (1966), and the court keeps discretion to decline under § 1367(c).

IP counterclaims worth considering

• Declaratory judgment of noninfringement and invalidity. Available whenever there is a case or controversy under 28 U.S.C. § 2201, judged under "all the circumstances." MedImmune, Inc. v. Genentech, Inc., 549 U.S. 118 (2007). Some courts dismiss "mirror image" declaratory counterclaims in ordinary cases as redundant, but in IP cases the invalidity counterclaim does independent work, as Cardinal Chemical shows. See Declaratory Judgment Actions: Jurisdiction, Discretion, and the Race to the Courthouse.
• Trademark cancellation. In "any action involving a registered mark," the court may order the cancellation of registrations in whole or in part. 15 U.S.C. § 1119. The grounds track 15 U.S.C. § 1064: the full menu of registrability objections during the registration's first five years, and a narrower list (genericness, functionality, abandonment, fraud, and a few others) after that. Section 1119 is not an independent grant of jurisdiction, so a plaintiff can sometimes moot the counterclaim with a broad covenant not to sue. Already, LLC v. Nike, Inc., 568 U.S. 85 (2013). See Trademark Cancellation in Federal Litigation: A Practical Guide.
• Antitrust and sham litigation. Enforcing a patent obtained by knowing fraud on the Patent Office can support a monopolization claim under 15 U.S.C. § 2, Walker Process Equipment, Inc. v. Food Machinery & Chemical Corp., 382 U.S. 172 (1965), and litigation that is objectively baseless and subjectively intended to interfere with a competitor loses antitrust immunity. Professional Real Estate Investors, Inc. v. Columbia Pictures Industries, Inc., 508 U.S. 49 (1993). These counterclaims are expensive, discovery-heavy, and, after Critical-Vac, risky to hold back.
• Contract counterclaims. In licensing disputes, claims for unpaid fees, refunds, service credits, or indemnity usually arise from the same agreement and are compulsory.

Crossclaims, third-party complaints, and the plaintiff's response

A crossclaim against a coparty arising out of the same transaction is permitted but not required. Rule 13(g). New parties may be joined to a counterclaim or crossclaim under Rules 19 and 20, Rule 13(h), and a defendant may implead a nonparty "who is or may be liable to it for all or part of the claim against it," without leave if it files the third-party complaint within 14 days after serving its original answer and with leave after that. Fed. R. Civ. P. 14(a)(1). That 14-day window is a reason to identify indemnitors and suppliers before the answer is filed, not after.

A counterclaim requires an answer within 21 days, Rule 12(a)(1)(B), and the plaintiff may instead move against it under Rule 12. A reply to an answer that contains only defenses is not allowed unless the court orders one. Rule 7(a)(7). A counterclaim filed after the answer, or a claim that matures later, comes in by amendment under Rule 15 or by supplemental pleading under Rule 13(e).

Judgment on the pleadings under Rule 12(c)

Rule 12(c) allows a motion for judgment on the pleadings "[a]fter the pleadings are closed," but "early enough not to delay trial." The pleadings close once a complaint and an answer have been filed, assuming no counterclaim or crossclaim is pending. Doe v. United States, 419 F.3d 1058, 1061 (9th Cir. 2005). If there is a counterclaim, wait for the answer to it; if there are several defendants, most courts wait until all have answered.

The standard. The test is the same as under Rule 12(b)(6). Patel v. Contemporary Classics of Beverly Hills, 259 F.3d 123 (2d Cir. 2001); Hayden v. Paterson, 594 F.3d 150 (2d Cir. 2010). The two motions are "functionally identical," and Iqbal applies to both. Cafasso v. General Dynamics C4 Systems, Inc., 637 F.3d 1047 (9th Cir. 2011). The difference is the record. A Rule 12(c) motion considers the answer too, and the Ninth Circuit explains how the two pleadings interact: judgment is proper when the movant "clearly establishes on the face of the pleadings that no material issue of fact remains to be resolved and that it is entitled to judgment as a matter of law," and "the allegations of the non-moving party must be accepted as true, while the allegations of the moving party which have been denied are assumed to be false." Hal Roach Studios, Inc. v. Richard Feiner & Co., 896 F.2d 1542, 1550 (9th Cir. 1990).

What the court may consider. The complaint, the answer, exhibits to either (which are "part of the pleading for all purposes" under Rule 10(c)), documents incorporated by reference, and matters subject to judicial notice. Tellabs, Inc. v. Makor Issues & Rights, Ltd., 551 U.S. 308, 322 (2007); Fed. R. Evid. 201. If the parties present other material and the court does not exclude it, the motion "must be treated as one for summary judgment under Rule 56," and all parties must get "a reasonable opportunity to present all the material that is pertinent to the motion." Rule 12(d).

How defendants use it. To raise a Rule 12(b)(6) argument after answering; courts treat an untimely Rule 12(b)(6) motion as one under Rule 12(c). Patel, 259 F.3d 123. To win on an affirmative defense that the complaint itself establishes, such as a limitations defense apparent from the dates pleaded. Jones v. Bock, 549 U.S. 199. To resolve pure questions of law: preemption, statutory standing, or the meaning of an unambiguous contract attached to the pleadings.

How plaintiffs use it. When the answer admits the operative facts and offers only legally insufficient defenses. The plaintiff in Hal Roach won judgment on the pleadings on its declaratory claim about when film licenses expired. In a collection or license-fee case, a defendant that admits the contract, admits the plaintiff's performance, admits nonpayment, and pleads only conclusory defenses has written the plaintiff's motion. The cure is the precision discussed above: particularized denials of conditions precedent under Rule 9(c), setoff or recoupment counterclaims, and defenses pleaded with facts.

Practical realities. Many judges require a pre-motion letter or conference; a pending motion does not automatically stay discovery; and a granted motion often comes with leave to amend. The denial of a Rule 12(c) motion is interlocutory, and preserving legal issues for appeal follows the ordinary rules: purely legal issues resolved at summary judgment are preserved, Dupree v. Younger, 598 U.S. 729 (2023), while fact-bound sufficiency arguments must be renewed under Rule 50. Ortiz v. Jordan, 562 U.S. 180 (2011). For the post-trial side of preservation, see Post-Trial Motions in Federal Court: Judgment as a Matter of Law, New Trial, Remittitur, and Relief From Judgment. For the motion practice generally, see Motions to Dismiss Under Rule 12: A Practical Guide for Plaintiffs and Defendants.

Jury demands, Rule 7.1 disclosures, verification, and local rules

Jury demands. A party may demand a jury on any issue triable of right by serving the other parties with a written demand, which may be included in a pleading, "no later than 14 days after the last pleading directed to the issue is served," and filing it under Rule 5(d). Fed. R. Civ. P. 38(b). A party that does not properly serve and file a demand waives a jury. Rule 38(d). For most issues the last pleading is the answer; for counterclaim issues it is the plaintiff's answer to the counterclaim. Relief is available only by motion under Fed. R. Civ. P. 39(b), and in the Ninth Circuit that discretion "does not permit a court to grant relief when the failure to make a timely demand results from an oversight or inadvertence." Pacific Fisheries Corp. v. HIH Casualty & General Insurance, Ltd., 239 F.3d 1000, 1002 (9th Cir. 2001). A pro se litigant's good-faith mistake about the deadline is still inadvertence. Zivkovic, 302 F.3d 1080. An amended pleading revives the right only for genuinely new issues, not new legal theories; in Lutz, the Ninth Circuit vacated a liability verdict because the plaintiff's timely demand had covered only remedies. Lutz v. Glendale Union High School, 403 F.3d 1061 (9th Cir. 2005). The Seventh Circuit enforces the deadline against unrepresented litigants too: the rules "apply to uncounseled litigants and must be enforced." Members v. Paige, 140 F.3d 699 (7th Cir. 1998). In removed cases, Rule 81(c)(3) controls. And when legal and equitable claims are joined, common legal issues go to the jury first, Beacon Theatres, Inc. v. Westover, 359 U.S. 500 (1959); Dairy Queen, Inc. v. Wood, 369 U.S. 469 (1962), so a damages counterclaim can bring a jury into what the plaintiff filed as an injunction case. Whether to demand one is a strategic call; in trademark cases, see Bench Trial vs. Jury Trial Issues in Trademark Litigation: A Practical Guide.

Rule 7.1 disclosure statements. A nongovernmental corporate party must file a statement identifying any parent corporation and any publicly held corporation owning 10% or more of its stock, or stating that there is none. Since December 1, 2022, when jurisdiction rests on diversity, every party must also file a statement naming, and identifying the citizenship of, every individual or entity whose citizenship is attributed to it, both when the action is filed or removed and when any later event could affect jurisdiction. Rule 7.1(a)(2). The statement is due with the party's first appearance, pleading, motion, or other filing, and must be supplemented if the information changes. For an LLC defendant, that means tracing members through every layer of ownership, which is why citizenship should be confirmed before the answer admits or denies jurisdictional facts. Many districts add their own interested-party certificates (Northern District of California Civil Local Rule 3-15 is one example).

Verification. Unless a rule or statute says otherwise, "a pleading need not be verified or accompanied by an affidavit." Fed. R. Civ. P. 11(a). A federal answer to a verified complaint therefore need not be verified, unlike California practice (Cal. Code Civ. Proc. § 446) or New York's (N.Y. C.P.L.R. 3020). Verification requirements in federal court are specific, such as derivative complaints under Fed. R. Civ. P. 23.1 and temporary restraining orders under Fed. R. Civ. P. 65(b). When a verified statement is needed, an unsworn declaration under 28 U.S.C. § 1746 works.

Local rules and standing orders. Read them before drafting. Some districts require each answer paragraph to restate the allegation it responds to (Northern District of Illinois Local Rule 10.1 is the familiar example). Many judges' standing orders forbid "speaks for itself," require a conference before Rule 12(f) or 12(c) motions, or demand pre-motion letters. A defendant that answers in a district it rarely visits should check the assigned judge's prior orders on answers, too.

Strategy for each side

For defendants

1. Decide motion or answer first. A Rule 12 motion delays the answer and may win, but it also teaches the plaintiff how to fix the complaint, and dismissal with leave to amend usually produces a better complaint. When the defects are curable, answering and holding the legal arguments for Rule 12(c) or summary judgment is often the better trade.
2. Investigate before admitting or denying. Pull the contracts, the USPTO and Copyright Office records, the corporate records, and the client's own website archive. Issue a litigation hold the same week.
3. Admit the undisputed; deny the characterizations. Denying facts the plaintiff can prove invites requests for admission and, if the plaintiff later proves the matter, expense-shifting under Fed. R. Civ. P. 37(c)(2). See Strategic Responses to Requests for Admission: A Comprehensive Guide for Legal Practitioners.
4. Plead the defenses the summary judgment motion will need. On an affirmative defense the defendant bears the burden, so at summary judgment it must affirmatively establish each element, Celotex Corp. v. Catrett, 477 U.S. 317 (1986), under the substantive evidentiary standard that will apply at trial. Anderson v. Liberty Lobby, Inc., 477 U.S. 242 (1986). See Summary Judgment Under Rule 56: Winning and Surviving Before Trial.
5. Use counterclaims deliberately. Compulsory counterclaims must go in. Permissive ones are a choice that trades leverage against escalation, insurance coverage (counterclaims are rarely covered), fee exposure, and jury rights.
6. Keep any preliminary statement short. Rule 8(d)(1) wants allegations "simple, concise, and direct." Themes belong in the defenses and counterclaims, not in a brief bolted to the front of the answer.
7. Calendar the windows the answer opens. Fourteen days for a jury demand, fourteen days to implead without leave, and, for the plaintiff, twenty-one days to amend as of course under Rule 15(a)(1)(B).

For plaintiffs

1. Inventory the admissions in a chart keyed to the elements, and use them in Rule 12(c) motions, requests for admission, and summary judgment.
2. Challenge evasions early. A meet-and-confer letter citing Rule 8(b) and State Farm v. Riley usually produces an amended answer; if not, ask the court to deem the allegations admitted or to order a compliant answer.
3. Use the as-of-course amendment window. The answer starts the plaintiff's 21-day clock under Rule 15(a)(1)(B), the cheapest moment to fix problems the answer exposed.
4. Answer or attack counterclaims within 21 days. Counterclaims are claims, so Twombly and Iqbal apply to them without debate. In trademark and patent cases, consider whether a covenant not to sue can moot declaratory and cancellation counterclaims under Already.
5. Strike selectively. Target only defenses that expand discovery or shift burdens, and expect leave to amend.

For individuals and small businesses without a lawyer

Individuals may represent themselves. 28 U.S.C. § 1654. Corporations, LLCs, and other entities generally may not: "a corporation may appear in the federal courts only through licensed counsel." Rowland v. California Men's Colony, 506 U.S. 194, 201-02 (1993). An owner who files an answer for the company risks having it struck and a default entered. Courts construe pro se filings liberally, Haines v. Kerner, 404 U.S. 519 (1972); Erickson v. Pardus, 551 U.S. 89 (2007), but the deadlines still apply. Calendar the due date, ask for an extension in writing before it runs, answer every numbered paragraph, include a jury demand if you want one, and plead any counterclaim arising from the same events. Many districts run pro se help desks. See the Self-Represented Litigant Toolkit: Forms, Filings, Hearings, and Collection.

Costs and practical realities

In our experience, a straightforward answer in a commercial case takes ten to twenty-five lawyer hours, most of it factual investigation; an IP answer with particularized defenses and counterclaims can take several times that. Notify insurers immediately, because tender delays can jeopardize coverage, and know that counterclaims are usually not covered. The answer also starts the case's machinery: the Rule 26(f) conference, initial disclosures that must identify witnesses and documents supporting the pleaded defenses under Fed. R. Civ. P. 26(a)(1), and a scheduling order whose deadline for amending pleadings converts the generous Rule 15 standard into Rule 16's demand for diligence.

Common mistakes

1. Missing the deadline, or relying on a stipulated extension the local rules required the court to approve.
2. General denials of facts the defendant knows are true, and "the document speaks for itself."
3. Leaving headings, footnotes, or unnumbered paragraphs unanswered, so they are admitted under Rule 8(b)(6).
4. Pleading lack of knowledge about the client's own documents or public records.
5. Admitting jurisdictional facts before confirming citizenship, especially for LLCs.
6. Answering on the merits without preserving personal jurisdiction, venue, or service objections.
7. Thirty boilerplate defenses plus a reservation of rights, instead of a dozen pleaded with facts.
8. Pleading fraud, inequitable conduct, failure of conditions precedent, or lack of capacity without the particularity Rule 9 requires.
9. Holding back a compulsory counterclaim for a later suit.
10. Answering and litigating when the client should have moved to compel arbitration.
11. Missing the 14-day jury demand or the 14-day window to file a third-party complaint without leave.
12. Forgetting the Rule 7.1 disclosure statement.

Worked examples

Example 1: a software company answers a copyright and license complaint

Juniper Labs, a 60-person software company, licensed Meridian Data Systems' "Atlas" SDK to build a data connector. After a dispute over a $180,000 "true-up" invoice, Meridian emailed that the license was terminated and, three months later, sued in the Northern District of California for copyright infringement, breach of the license, and unjust enrichment. The complaint alleges that Juniper kept distributing the connector, with Atlas libraries inside, after termination, and that it copied Atlas header files into an open-source plugin.

Juniper's counsel obtains a court-approved extension and spends it on facts, not forms. Three paragraph responses carry most of the weight.

• Paragraph 14 alleges that Meridian "owns valid copyrights in the Atlas SDK." Juniper admits that the Copyright Office's public records show a registration in Meridian's name for a work titled Atlas SDK 4.0, states that it lacks knowledge or information sufficient to form a belief about whether the deposit matches the versions at issue or about Meridian's chain of title, and denies the rest. Ownership of a valid copyright remains Meridian's burden. Feist Publications, Inc. v. Rural Telephone Service Co., 499 U.S. 340 (1991).
• Paragraph 22 alleges that the license "conditioned Juniper's right to use the SDK on timely payment." Juniper admits that the license is attached as Exhibit A, denies the characterization, and avers that the grant in section 2.1 is not conditioned on payment and that section 9.3 allows termination only after 30 days' written notice and an opportunity to cure. That averment frames the decisive legal question: if payment is a covenant rather than a condition, Meridian's remedy for nonpayment lies in contract, not copyright. Graham v. James, 144 F.3d 229 (2d Cir. 1998); MDY Industries, LLC v. Blizzard Entertainment, Inc., 629 F.3d 928 (9th Cir. 2010); Restatement (Second) of Contracts § 224 (a condition is an event that must occur before performance becomes due).
• Paragraph 30 alleges that "all conditions precedent to termination have been performed." Juniper denies it with particularity under Rule 9(c): Meridian never sent the written notice section 9.3 requires and never allowed the cure period. Without that specific denial, the allegation would be treated as admitted. Jackson, 678 F.2d 992.

Juniper pleads seven defenses, each with two or three sentences of facts: license, because termination never validly occurred; implied license and estoppel, because Meridian's account manager wrote that Juniper should "keep the connector live while finance sorts this out"; fair use limited to the header files, invoking the treatment of reimplemented interface code in Google LLC v. Oracle America, Inc., 593 U.S. 1 (2021); the bar on statutory damages and fees under 17 U.S.C. § 412, because Meridian registered version 4.0 after the alleged infringement began; limitations for acts more than three years before suit; preemption under 17 U.S.C. § 301 of the unjust enrichment count, which seeks the value of copying (the contract count survives, as in ProCD, Inc. v. Zeidenberg, 86 F.3d 1447 (7th Cir. 1996)); and setoff for $96,000 in service-level credits Meridian owes.

What Juniper leaves out matters as much. It does not plead the essential-step defense of 17 U.S.C. § 117, which protects owners of copies, because its license makes it a licensee. It does not plead copyright misuse, because it has no facts about anticompetitive restrictions. It does not list "failure to state a claim" as an affirmative defense or reserve unnamed defenses.

Juniper counterclaims for declarations of noninfringement, that payment is a covenant, and that the termination was ineffective, and for breach of contract to recover the service credits. The contract counterclaim arises from the same agreement as Meridian's claims, so it is compulsory. The answer demands a jury in the caption and at the end. Juniper files a Rule 7.1(a)(1) statement; the citizenship disclosure in Rule 7.1(a)(2) does not apply, because jurisdiction rests on the copyright claim, with supplemental jurisdiction over the state claims. (Had the license required arbitration, Juniper would have had to decide before answering whether to move to compel, because litigating the merits can waive the right. Morgan, 596 U.S. 411.)

What happened next shows why the precision mattered. Meridian moved to strike the implied license and fair use defenses as conclusory; under the Ninth Circuit's fair-notice standard, Kohler, 779 F.3d 1016, and with facts pleaded, the motion failed. Meridian then moved for judgment on the pleadings on the contract count, relying on Juniper's admission that it had not paid the invoice. The court denied the motion because the particularized Rule 9(c) denial and the setoff counterclaim raised issues the pleadings could not resolve. Hal Roach, 896 F.2d 1542. With statutory damages off the table under § 412 and the covenant argument intact, the case settled for a fraction of the invoice.

Example 2: a small business counterclaims to cancel the plaintiff's registration

Harbor Lane Coffee Co., LLC runs three cafés in Maine under the HARBOR LANE name, which it has used since 2016 without registering it. Harborline Holdings, LLC owns a federal registration for HARBORLINE covering coffee and café services, issued four years and nine months before it sues Harbor Lane in the District of Maine for infringement under 15 U.S.C. § 1114 and unfair competition under 15 U.S.C. § 1125(a).

First decision: hire a lawyer. The owners' instinct is to write the judge a letter explaining that they were there first. An LLC cannot appear without counsel, Rowland, 506 U.S. at 201-02, and a letter from an owner would likely be struck, leaving the company in default.

Second decision: answer rather than move. Counsel spots a clock the complaint does not mention. Cancellation on the grounds that matter most here, Harbor Lane's priority and likelihood of confusion under section 2(d), is available under 15 U.S.C. § 1064 only within five years of registration; after that, the grounds narrow to genericness, functionality, abandonment, fraud, and a few others. Because § 1119 cancellations draw their grounds from § 1064, counsel treats the fifth anniversary, three months away, as a hard deadline and decides against a Rule 12 motion that could push the counterclaims past it.

The answer. Harbor Lane admits that the USPTO register shows the HARBORLINE registration, denies the allegations of validity, enforceable rights, and likelihood of confusion, and avers its own first use in 2016. Its affirmative defenses are priority of use, with a fallback to the limited-area prior-use defense of 15 U.S.C. § 1115(b)(5) if the registration becomes incontestable, and laches and acquiescence: Harborline's founder visited a Harbor Lane café and reviewed it online in 2019, then said nothing while Harbor Lane opened two more locations. Jarrow, 304 F.3d 829. Counsel suspects that Harborline's application claimed use for café services it never offered, but has no evidence of intent to deceive, which fraud on the USPTO requires. In re Bose Corp., 580 F.3d 1240 (Fed. Cir. 2009). So the answer pleads nonuse as a basis for partial cancellation and leaves fraud for a later amendment if discovery supplies the intent evidence.

The counterclaims. (1) Cancellation under 15 U.S.C. § 1119 on priority and likelihood of confusion, pleaded in the alternative to Harbor Lane's position that there is no confusion at all, which Rule 8(d)(3) allows. (2) Partial cancellation as to café services, for nonuse. (3) Harbor Lane's own claim under § 1125(a) as the senior user, which arises from the same competing uses and is therefore compulsory. (4) A declaration of noninfringement. The answer demands a jury.

The plaintiff's options. Harborline considers a covenant not to sue, the move that ended the cancellation counterclaim in Already, LLC v. Nike, Inc., 568 U.S. 85 (2013). It would not work here, because Harbor Lane's § 1125(a) counterclaim is an independent federal claim that keeps the case, and the registration, in play. The parties settle on coexistence: Harborline deletes café services from its registration and accepts a geographic carve-out, and Harbor Lane withdraws its priority-based cancellation claim. The leverage came from an answer filed before the fifth anniversary.

Frequently asked questions

How long do I have to answer a federal complaint? Usually 21 days after service; 60 days from the date the waiver request was sent if you waive service; and 14 days after the court rules on a Rule 12 motion. Removed cases follow Rule 81(c)(2). Ask for any extension before the deadline, in the form the local rules require.

Can I just deny everything? Only if you can deny every allegation in good faith, including the jurisdictional ones. Otherwise a general denial violates Rules 8(b)(3) and 11, and courts may treat evasive responses as admissions.

What happens if I do not respond to a paragraph? Under Rule 8(b)(6), it is admitted, unless it concerns the amount of damages.

What if I forget an affirmative defense? The default rule is forfeiture, but most circuits allow a defense raised at a pragmatically sufficient time without unfair prejudice, and leave to amend is freely given before the scheduling order deadline. The D.C. Circuit is stricter, and a defense first raised after trial is almost always gone.

Does Twombly apply to my affirmative defenses? In the Second Circuit, yes, applied with attention to context; in the Fifth and Ninth Circuits the test is fair notice; elsewhere district courts are split. Plead a few facts per defense and the question will not matter.

Is "failure to state a claim" an affirmative defense? No. It is a defense preserved by Rule 12(h)(2) that the answer may include and a Rule 12(c) motion may later raise. Listing it under "affirmative defenses" is harmless but imprecise.

Must I file my counterclaim now? If it arises from the same transaction or occurrence as the plaintiff's claim, yes, or it is barred later. Baker, 417 U.S. at 469 n.1. Permissive counterclaims are optional, subject to limitations periods and the court's supplemental jurisdiction.

Can the plaintiff win on my answer alone? Yes. If the answer admits the operative facts and pleads only legally insufficient defenses, Rule 12(c) allows judgment on the pleadings.

Does my company need a lawyer to answer? In federal court, yes, for corporations, LLCs, and partnerships. Individuals may represent themselves.

My case was removed after I filed a general denial in state court. Do I need a new answer? Not unless the court orders one, Rule 81(c)(2), but a federal-form answer is often wise if you have counterclaims, Rule 9 matters, or specific affirmative defenses to plead.

Practical takeaways

• Calendar the answer date the day the complaint arrives, and confirm that any extension is effective under the local rules.
• Respond to every numbered paragraph with one of the three Rule 8(b) responses, then deny everything not expressly admitted.
• Admit precisely, deny characterizations, and never claim ignorance of your own records.
• Plead each affirmative defense with a few sentences of facts, and plead fraud, inequitable conduct, conditions precedent, and capacity with the particularity Rule 9 requires.
• Put personal jurisdiction, venue, and service objections in the first filing or lose them.
• Plead compulsory counterclaims now; in IP cases, pair invalidity defenses with declaratory counterclaims, and watch the five-year window for trademark cancellation grounds.
• Serve a jury demand within 14 days, and file any third-party complaint within 14 days of the answer to avoid needing leave.
• Plaintiffs: inventory the admissions, use the 21-day amendment window, and consider Rule 12(c) when the answer concedes the facts.

This document is general information, not legal advice for any particular situation; the law changes, and the facts matter.

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• Indirect and Divided Patent Infringement: Inducement, Contributory Liability, and the Akamai Problem: the knowledge and intent elements an accused inducer's answer must contest.
• Trademark Fair Use: Descriptive Use, Nominative Use, and Expressive Works After Jack Daniel's: the fair use defenses a trademark defendant pleads and how burdens differ by circuit.
• Trademark Cancellation in Federal Litigation: A Practical Guide: the grounds and timing for cancellation counterclaims under § 1119.
• Declaratory Judgment Actions: Jurisdiction, Discretion, and the Race to the Courthouse: when a declaratory counterclaim presents a live controversy.
• Understanding Equitable Defenses: A Comprehensive Guide to Laches, Acquiescence, Waiver, and Equitable Estoppel: the elements behind the equitable defenses most answers plead.
• Res Judicata, Collateral Estoppel, and the Preclusive Effect of Judgments: preclusion as an affirmative defense and its link to the compulsory counterclaim rule.
• Statutes of Limitations, Accrual, and Tolling: The Clock That Ends Most Claims: the limitations analysis behind the most common affirmative defense.
• Rule 11 and Inherent-Power Sanctions: The Safe Harbor, Fee Awards, and Attorney Conduct: the certification every denial and defense carries.
• Summary Judgment Under Rule 56: Winning and Surviving Before Trial: where pleaded defenses are tested on evidence.

Related Guides

• Drafting an Answer and Affirmative Defenses: A Practical Guide: the step-by-step companion to this article, from intake to filing.
• Motions to Dismiss Under Rule 12: A Practical Guide for Plaintiffs and Defendants: the alternative to answering, and the consolidation and waiver rules that govern it.
• Drafting a Complaint That Survives a Motion to Dismiss: the plaintiff's side of the pleading contest.
• Removal and Remand: Getting a Case to Federal Court and Keeping It There: removal deadlines and how they interact with the answer.
• Pleading and Proving Induced and Contributory Patent Infringement: A Practical Guide: pleading standards on the claim side of patent cases.
• Filing or Opposing Post-Trial Motions Under Rules 50, 59, and 60: A Practical Guide: the procedural endgame for issues framed at the pleading stage.

Related Checklists

• Answer and Affirmative Defenses Checklist: A Practical Checklist: every deadline, response, defense, and counterclaim decision in one list.
• Petitioning to Cancel a Trademark Registration: A Practical Checklist: grounds, timing, and proof for cancellation.
• Rule 11 Sanctions and Safe Harbor Checklist: A Practical Checklist: testing denials and defenses before signing.

Related Toolkits

• Responsive Pleading Toolkit: Answer Templates, Affirmative Defense Libraries, and Counterclaim Outlines: model answers, defense language, and counterclaim outlines.
• Civil Procedure Toolkit: Pleadings, Jurisdiction, Preclusion, and Deadlines: the broader procedural framework.
• Federal Civil Litigation Toolkit: A Roadmap and Resource Guide: where the answer fits in the life of a federal case.
• Self-Represented Litigant Toolkit: Forms, Filings, Hearings, and Collection: practical help for individuals answering without counsel.