Summary. Business tax planning is a small number of decisions made at predictable moments, and the ones that matter most are made when the business is least able to evaluate them. This toolkit sequences them: the entity and classification choice at formation, the compensation architecture that follows, the state footprint that accumulates invisibly, the equity incentives with their own elections and deadlines, and the exit, where the structure chosen years earlier determines the after-tax proceeds. Each stage identifies the decision, the deadline if there is one, the documentation an examination will request, and the point at which the choice becomes irreversible.

What this toolkit is for, and who should use it

The most expensive tax mistakes in closely held business are not aggressive positions that failed. They are defaults that nobody chose: a C corporation formed because that is what startups do, holding appreciated real estate a decade later; an S election made without conforming the operating agreement; a state where employees worked for three years and no return was filed; an 83(b) that was completed and never mailed.

This toolkit is for an owner, a CFO, and the counsel or accountant advising them. It assumes a privately held operating business, and it flags the points where a specialist is required rather than pretending otherwise.

Roadmap at a glance

  1. Entity and classification at formation.
  2. The self-employment tax decision and reasonable compensation.
  3. Basis, losses, and leverage.
  4. The § 199A deduction and what it rewards.
  5. Qualified small business stock, and when the C corporation wins.
  6. State taxes — entity-level taxes, PTET elections, and nexus.
  7. Equity compensation and its elections.
  8. Accumulations, distributions, and the traps that follow them.
  9. Restructuring when the original choice stops fitting.
  10. Preparing the exit.
  11. The transaction — asset, stock, and hybrid structures.
  12. After the sale, and the estate plan.

Stage 1 — Entity and classification

  • Separate the state-law entity from the federal tax classification. Since the check-the-box regulations they are different questions.
  • Defaults: a single-member LLC is disregarded; a multi-member LLC is a partnership; a state-law corporation is a C corporation.
  • Elections: Form 8832 for corporate classification; Form 2553 for S status, which an eligible LLC may file directly. Timing is generally the 15th day of the third month of the year for which the election applies, with late relief available under a revenue procedure but not to be planned around.
  • The sixty-month rule limits changing classification again by election.
  • A default worth adopting: start as an LLC unless there is a specific reason not to, because an LLC can elect into any regime later while a C corporation with appreciated assets cannot get out.
  • The specific reasons not to are real: venture financing, a § 1202 strategy, and industries where every buyer expects a corporation.

Resources

Stage 2 — Self-employment tax and reasonable compensation

  • A sole proprietor's or operating partner's earnings are subject to self-employment tax; an S corporation shareholder-employee pays FICA on salary only, with the distributive share exempt.
  • The constraint is reasonable compensation, and the IRS recharacterizes distributions as wages where the salary is unreasonably low.
  • Document the number: comparable compensation surveys by role, industry, and geography; an allocation of the owner's time among executive, production, and administrative functions; the company's reliance on non-owner employees and on capital; and a board or member resolution setting the salary annually with the analysis attached.
  • Partners are generally not employees of their own partnership, and guaranteed payments are subject to SE tax. The limited partner exception in IRC § 1402(a)(13) does not shield a partner actively performing services.
  • Note the interaction with § 199A: W-2 wages help above the threshold, which cuts against minimizing salary.

Illustration. A consultant with $250,000 of profit elects S status and takes a $120,000 salary supported by a survey. The saving is real; the same election with a $30,000 salary and no support is an audit adjustment with penalties.

Resources

Stage 3 — Basis, losses, and leverage

  • Losses are deductible only to the extent of basis, then at risk under § 465, then as permitted by the passive activity rules of § 469, then subject to the excess business loss limitation.
  • The critical difference: a partner's basis includes a share of partnership liabilities under § 752; an S corporation shareholder's does not, and a personal guarantee creates no basis.
  • Distributions of appreciated property are generally tax-free from a partnership and are treated as a sale at fair market value from a corporation under § 311(b).
  • Put appreciating assets where they can be extracted — real estate and licensable intellectual property in a partnership, not inside a corporation.
  • Maintain basis schedules annually, per owner. Reconstructing them at a sale is expensive and sometimes impossible.

Resources

Stage 4 — The § 199A deduction

  • Up to 20% of qualified business income from a domestic pass-through.
  • Above the taxable income threshold, two limits apply: the W-2 wage and capital limit (the greater of 50% of W-2 wages, or 25% of wages plus 2.5% of the unadjusted basis of qualified property), and the specified service trade or business exclusion covering health, law, accounting, consulting, financial services, athletics, performing arts, and businesses whose principal asset is reputation or skill.
  • Planning: aggregation elections across commonly controlled businesses; separating genuinely distinct non-service functions with real substance and arm's-length pricing; and calibrating the S corporation salary against the wage limitation.
  • Model both ways. The provision has a scheduled expiration, and any pass-through-versus-C-corporation comparison should be run with and without it.

Stage 5 — Qualified small business stock

  • § 1202 excludes gain on C corporation stock acquired at original issuance, held five years, from a corporation with $50 million or less of gross assets at issuance, meeting the active business requirement, up to the greater of $10 million or 10× basis.
  • Track eligibility contemporaneously: the gross-asset test at each issuance, the issuance date, the holding period start (which for an option is the exercise date, not the grant date), the holder's basis, any redemptions in the disqualifying windows, and the annual active business confirmation.
  • Stacking and packing — gifts to non-grantor trusts and family members to multiply the cap, and contributions of appreciated property to increase basis for the 10× prong — are legitimate and require care.
  • For a business that reinvests and exits by selling stock, § 1202 frequently makes the C corporation the lowest-tax structure available.

Resources

Stage 6 — State taxes

  • Entity-level taxes — franchise, margin, gross receipts, and city-level taxes that may not recognize federal S status.
  • Pass-through entity tax elections, now available in most income-tax states, deducting the state tax at the entity level and crediting owners. Frequently worth more than the entire self-employment tax analysis, and available only to pass-throughs.
  • Nexus wherever employees, property, or economic presence exist, with income, sales, and payroll filing obligations.
  • Apportionment and the sourcing rules for services and intangibles.
  • Composite returns and nonresident withholding for out-of-state owners.
  • Conformity — not every state follows the federal treatment of S corporations, § 199A, or bonus depreciation.

Resources

Stage 7 — Equity compensation

  • Restricted stock with an § 83(b) election filed within thirty days — no extension, no cure — which also starts the capital gains and QSBS clocks.
  • Incentive stock options for employees only, under a stockholder-approved plan, at fair market value, with the $100,000 annual limit and the AMT consequence on exercise.
  • Nonqualified options for anyone, taxed at exercise on the spread.
  • § 409A valuations obtained before granting, refreshed annually and after any material event. A stale price creates tax exposure for the employee.
  • RSUs with double-trigger vesting for a private company, so no tax event precedes liquidity.
  • Profits interests in an LLC, non-taxable at grant under the safe harbor if properly structured with a threshold — and converting the holder into a partner, with K-1 reporting and self-employment tax.
  • Rule 701 volume and disclosure thresholds tracked, and blue sky notices filed.

Resources

Stage 8 — Accumulations, distributions, and traps

  • Accumulated earnings tax under § 531 on earnings retained beyond the reasonable needs of the business; defend with documented plans and a working capital analysis.
  • Personal holding company tax under § 541 where a closely held corporation's income becomes largely passive — which happens after an operating business is sold.
  • S corporation traps: the one class of stock rule, which disproportionate distributions and non-conforming operating agreement provisions can violate; ineligible shareholders; the built-in gains tax under § 1374 for five years after a C-to-S conversion; and excessive passive investment income where C corporation earnings and profits remain.
  • Mandatory tax distributions in a pass-through, without which a minority owner owes tax on income never received.
  • Form 7203 basis reporting for S corporation shareholders claiming losses or receiving distributions.

Resources

Stage 9 — Restructuring

  • Partnership or disregarded LLC to corporation — generally tax-free under § 351, subject to § 357(c) gain where liabilities exceed basis.
  • Corporation to corporation, different state — tax-free under § 368(a)(1)(F), with attributes carrying over.
  • Corporation to LLC — a deemed liquidation taxed at both levels. Model it before doing anything else; for an appreciated business it is usually prohibitive.
  • The F reorganization for an S corporation preparing to sell: contribute the operating S corporation to a new holding company, elect QSub treatment, and convert the subsidiary to an LLC. The buyer purchases units and receives asset treatment; the sellers pay one level of tax; and the S election history risk is cleaned up.
  • State-law conversions and mergers where the tax result permits, with attention to lender consent, UCC re-perfection, appraisal rights, and license transferability.

Resources

Stage 10 — Preparing the exit

Begin eighteen to thirty-six months before a sale process.

  • Model the after-tax proceeds under the likely structures. This number, not the headline price, is the objective.
  • Complete any restructuring — the F reorganization, the separation of real estate, the resolution of a second class of stock — while there is time.
  • Clean the records: basis schedules, 83(b) elections with proof of mailing, 409A valuations, Form 2553 acceptance letters, state registrations, and QSBS documentation.
  • Address personal goodwill where the facts support it: no prior assignment to the company, genuinely personal customer relationships, and a contemporaneous analysis.
  • Consider a gift or trust transfer of interests before the value rises, using the current exemption.
  • Confirm the § 1202 holding period and whether waiting improves the outcome.
  • Resolve nexus and payroll exposure before diligence quantifies it as an escrow item.

Resources

Stage 11 — The transaction

  • Asset sale — one level of tax for a pass-through, two for a C corporation; the buyer gets a stepped-up basis and allocates the price under § 1060 using Form 8594.
  • Stock sale — one level of tax for the seller, carryover basis for the buyer.
  • Deemed asset sale elections — § 338(h)(10) and § 336(e) for an S corporation, giving the buyer asset treatment from a stock purchase.
  • Purchase price allocation negotiated: goodwill and going concern versus tangible assets versus a covenant not to compete, each with different consequences to each side.
  • Installment reporting under § 453, with depreciation recapture accelerated into the year of sale and a possible interest charge under § 453A.
  • Rollover equity structured to be tax-deferred where possible.
  • Escrow, earnout, and working capital adjustments, each with its own timing and character consequences.
  • Transaction expenses — determine what is deductible, what is capitalized, and who bears each.

Resources

Stage 12 — After the sale, and the estate plan

  • Manage the proceeds entity. A C corporation that sold its business and now holds investments faces the personal holding company tax.
  • Confirm the § 1202 exclusion is claimed correctly, with the documentation assembled.
  • Consider a qualified opportunity fund investment for gain deferral where the facts fit, or a charitable remainder trust where the intent is genuine.
  • Update the estate plan — the liquidity event changes everything about it, and the exemption and valuation environment may have changed too.
  • Address state residency deliberately if a move is contemplated, understanding that departure-year sourcing rules and residency audits are real.
  • Retain the tax file permanently: the returns, the elections, the valuations, the allocation, and the closing documents. A question about basis will arrive in twenty years.

Resources

Master resource index

Articles

Guides

Checklists

Related toolkits

External and primary sources

  • Classification and formation: Treas. Reg. § 301.7701-3; 26 U.S.C. § 351; § 357; § 721
  • Pass-throughs: § 199A; § 465; § 469; § 752; § 1361; § 1374
  • Compensation: § 83; § 409A; § 422; § 1402
  • Exit: § 338; § 368; § 453; § 1060; § 1202; § 1031
  • Accumulations: § 531; § 541

This toolkit is educational and not legal or tax advice. Federal provisions discussed here are subject to legislative change, state entity-level taxes and conformity vary, and several elections carry deadlines that cannot be extended. Consult qualified tax counsel and an accountant before making an election or structuring a transaction.