Summary. Rule 11 practice is procedural before it is substantive, and most motions fail on the safe harbor rather than on the merits. The rule requires a separate motion, served and not filed, with twenty-one days to withdraw or correct — and a motion filed without that sequence is denied almost automatically. This checklist covers the pre-filing inquiry that prevents exposure, the exact safe harbor procedure, the response for a party receiving a motion, and the separate regimes governing discovery conduct, conduct that multiplies proceedings, and bad-faith conduct reachable only through inherent power.

What this checklist is for. Complying with Rule 11, seeking sanctions, and responding to a motion. For the doctrine, see Rule 11 and Inherent-Power Sanctions.

Phase 1 — Before signing any paper

  • Verify every citation against the original source. Confirm the case exists, the citation is accurate, the holding is as represented, the procedural posture supports the use, and the authority remains good law.
  • Find and address adverse controlling authority, which Model Rule 3.3 requires you to disclose if opposing counsel has not.
  • Confirm each factual contention has evidentiary support you could identify to a judge, and note the source.
  • Where a contention depends on facts in the opponent's control, say so specifically in the pleading, as Rule 11(b)(3) requires. A blanket assertion that everything will be proved later does not qualify.
  • Where a legal contention is foreclosed by binding precedent, frame it expressly as an argument for extending, modifying, or reversing existing law.
  • Assess whether the client's account is plausible on its face and consistent with the documents you hold.
  • Document the pre-filing investigation — what was reviewed, who was interviewed, what was researched — in a memorandum to the file.
  • Check the judge's standing orders, including any requirement to disclose the use of generative artificial intelligence or to certify that citations were verified.

Why this matters. The certification is objective. Good faith is not a defense, and the rule reaches not only the initial filing but later advocating the paper — so a claim that discovery gutted must be abandoned rather than pressed.

Phase 2 — Seeking sanctions

  • Choose the right authority. Rule 11 for papers filed with the court; Rule 26(g) and Rule 37 for discovery, where Rule 11 does not apply; § 1927 for an attorney whose conduct multiplied the proceedings; inherent power for bad-faith conduct the rules do not reach.
  • Prepare the motion as a separate document — not a section of an opposition, not a footnote.
  • Describe the specific conduct alleged to violate Rule 11(b), by paper and by paragraph.
  • Serve the motion on the offending party. Do not file it.
  • Calendar twenty-one days from service.
  • If the paper is withdrawn or appropriately corrected within the period, the motion may not be filed.
  • File only after the period expires without withdrawal.
  • Note the timing risk: if the case settles or is dismissed before the period runs, the motion can no longer be filed. Move early enough that the window closes while the case is live.
  • Do not assume a warning letter substitutes for service of the motion; most circuits require service of the motion itself.
  • Consider whether a letter identifying the problem would achieve the objective without a motion. Most correctable conduct is corrected when identified privately.

Phase 3 — Responding to a motion

  • Calendar the twenty-one days on receipt.
  • Re-read the challenged paper with fresh eyes, ideally with a colleague who did not draft it.
  • Verify every citation in it, independently.
  • If the criticism has merit, withdraw or amend within the safe harbor. This ends the exposure entirely and courts do not treat it as an admission.
  • If it does not, respond substantively, and consider whether the motion itself was interposed for an improper purpose — Rule 11 applies to sanctions motions.
  • Notify the professional liability carrier. Many policies cover sanctions defense and late notice is a coverage problem.
  • Assess whether the attorney's and the client's interests diverge, and arrange separate counsel where they do.
  • Preserve the record: request specific findings identifying the conduct, the provision violated, the state-of-mind finding, and the calculation of any amount.

Phase 4 — The other regimes

Discovery — Rule 26(g) and Rule 37

  • Note that Rule 11 does not apply to disclosures, discovery requests, responses, objections, or motions under Rules 26 through 37.
  • Rule 26(g) requires certification that a disclosure is complete and correct and that a request, response, or objection is warranted, not interposed for an improper purpose, and neither unreasonable nor unduly burdensome. The sanction is mandatory on violation, and there is no safe harbor.
  • Rule 37(a)(5) makes fee-shifting on a motion to compel presumptive.
  • Rule 37(c)(1) exclusion of undisclosed information is automatic and self-executing absent substantial justification or harmlessness.
  • Rule 37(e) is the exclusive framework for lost electronically stored information, requiring intent to deprive for severe measures.

Section 1927

  • Reaches attorneys only, for conduct that multiplies the proceedings unreasonably and vexatiously.
  • No safe harbor and no separate-motion requirement.
  • Does not reach the initial filing; it requires a course of conduct.
  • Check the circuit's state-of-mind standard — subjective bad faith in some, objective recklessness in others.
  • The award is compensatory: the excess costs actually caused.

Inherent power

  • Requires a specific finding of bad faith.
  • Reaches parties as well as attorneys, and conduct outside the courtroom.
  • Fee awards are limited by but-for causation under Goodyear Tire & Rubber Co. v. Haeger, 581 U.S. 101 (2017), and must be compensatory rather than punitive.
  • Build the causal record contemporaneously — which motions, which tasks, which hours would not have been necessary.

Phase 5 — Verification of authority

  • Read every case cited, in the original reporter or database, before filing.
  • Confirm the holding, not merely the headnote.
  • Confirm the case has not been reversed, vacated, superseded, or abrogated.
  • If a generative tool was used at any stage, verify independently — the tool's output is not a source.
  • Comply with any standing order requiring disclosure or certification.
  • If a citation cannot be verified, remove it rather than filing and hoping.
  • If a defect is discovered after filing, notify the court promptly and correct it. The sanctions in the reported cases were driven far more by the failure to come clean than by the original error.

Common mistakes

  1. Filing the Rule 11 motion without serving it first, which is denied without reaching the merits.
  2. Including the sanctions request in an opposition brief rather than as a separate motion.
  3. Serving the motion too late, so the case resolves before the safe harbor expires.
  4. Using Rule 11 for a discovery dispute, where it does not apply.
  5. Kitchen-sink motions citing every authority at once, which signal that counsel has not analyzed the conduct.
  6. Seeking sanctions because the other side lost. Losing is not sanctionable, and courts say so.
  7. Block-billed fee petitions with no causal analysis, which get cut or remanded.
  8. Ignoring a served motion rather than evaluating whether the paper should be withdrawn.
  9. Not notifying the carrier.
  10. Filing a brief with unverified citations, which is now a documented and public professional risk.

Primary authority

Related

This checklist is educational and not legal advice. Circuits differ on the § 1927 standard and on several safe-harbor questions, state sanctions rules vary from the federal rule, and individual judges' standing orders impose additional requirements. Consult qualified litigation counsel before filing or responding to a sanctions motion.