Checklist · Tax

Choosing a Tax Entity: A Practical Checklist

Type
Checklist
Jurisdiction
National
Date
2024-04-08
Topic
Tax

Entity choice is the first tax decision a business makes and the one it is stuck with the longest. This checklist walks founders and their counsel through the eleven phases of the analysis: mapping the owners against the S corporation eligibility limits, projecting whether profits will be distributed or reinvested, testing for Section 1202 qualified small business stock, modeling self-employment and payroll tax across the alternatives, evaluating the Section 199A deduction and the specified-service limitation, designing the equity compensation plan, planning for outside investment, checking state income tax and franchise fees, and thinking through the exit. It closes with the mechanics of making the election on Form 2553 or Form 8832, the deadlines that cannot be missed, and a candid look at what it costs to convert later. A running worked example follows two software founders through the same decision. Federal tax classification is governed by the Internal Revenue Code and the check-the-box regulations; entity formation and franchise taxes are state law and vary materially.

Choosing a Tax Entity: A Practical Checklist

Tax > Business Tax | Published 8 April 2024 - Updated 19 September 2025 | UpLaw - uplaw.us

Entity choice is the cheapest decision you will ever make and the most expensive one to unmake. The formation fee is a few hundred dollars. Converting a C corporation back to an LLC five years later can cost you a full second layer of tax on every dollar of built-in gain. Get it right at the front.

Keywords: entity choice, tax classification, S corporation, C corporation, LLC, check-the-box, Form 2553, Form 8832, Section 1202 QSBS, Section 199A, self-employment tax, reasonable compensation, profits interest, franchise tax, entity conversion

How to use this checklist

Two things are being chosen, and people constantly conflate them.

The first is the state-law entity: a corporation formed under a state corporation statute (the Delaware General Corporation Law, the California Corporations Code, or the Model Business Corporation Act, adopted in substantial part by a majority of states), or a limited liability company formed under a state LLC act, or a limited partnership. That choice governs limited liability, governance, fiduciary duties, and dissolution — and it is entirely a matter of state law. There is no federal law of business entities. Throughout this checklist, Delaware is used as the corporate reference point, because it is where most venture-backed companies incorporate and because its statute and Court of Chancery case law are the ones investors and their counsel expect. That is a convention, not a national rule. Franchise taxes, LLC acts, conversion mechanics, and conformity to the federal S election all vary materially, and you must confirm the rule in your own formation state and in every state where you operate.

The second is the federal tax classification: C corporation, S corporation, partnership, or disregarded entity. That choice governs how income is taxed and to whom. Unlike entity law, this is uniform and national — it comes from the Internal Revenue Code and the Treasury regulations, and it applies the same way in Wilmington and in Fresno. The state tax consequences that ride on top of it (Phase 8) do not.

These are separable. Under the check-the-box regulations, Treas. Reg. § 301.7701-3, an LLC — an "eligible entity" — may be taxed as a partnership (the default with two or more members), as a disregarded entity (the default with one member), as a C corporation (by electing on Form 8832), or as an S corporation (by electing on Form 2553, which under Treas. Reg. § 301.7701-3(c)(1)(v)(C) is deemed to carry an association election with it). A state-law corporation, by contrast, is a C corporation by default and can only become an S corporation, never a partnership.

So the real question is not "LLC or corporation." It is: which of the four tax regimes do I want, and what is the cheapest state-law wrapper to get me there?

Work the phases in order. Phases 2 and 3 usually decide the case; everything else refines it.

Our running example. Vellum Systems is a two-founder B2B software company. Dana Okonkwo and Ravi Chandran own it 50/50. They expect to lose money for two years, then earn roughly $600,000 of profit in year three. They intend to plow every dollar back into engineering, hire fifteen people, grant equity to all of them, raise a seed round from a venture fund within eighteen months, and sell the company in seven to ten years. We will run Vellum through every phase.

Phase 1 — Map the owners and test S-corp eligibility

  • [ ] List every intended owner at formation, and every owner reasonably foreseeable in the next 24 months.
  • [ ] For each owner, record: individual or entity; U.S. citizen, resident alien, or nonresident alien; if a trust, what kind of trust; if an entity, what type.
  • [ ] Count the shareholders. The S corporation limit is 100, but under I.R.C. § 1361(c)(1) a "family" — all descendants of a common ancestor within six generations, plus spouses — counts as one.
  • [ ] Confirm no owner is a nonresident alien. This is an absolute bar under § 1361(b)(1)(C).
  • [ ] Confirm no owner is a partnership, LLC, or C corporation. Permitted owners are individuals, estates, certain trusts, and certain tax-exempt organizations. (A wholly owned S corporation subsidiary can be a QSub under § 1361(b)(3), but that is a subsidiary, not a shareholder.)
  • [ ] If a trust will hold stock, confirm it is a grantor trust, a QSST (§ 1361(d)), an ESBT (§ 1361(e)), a voting trust, or a testamentary trust within the permitted window.
  • [ ] Confirm the entity itself is eligible: a domestic corporation (or an eligible entity electing corporate treatment), not an insurance company taxed under subchapter L, not certain financial institutions, not a DISC (§ 1361(b)(2)).
  • [ ] Confirm one class of stock (§ 1361(b)(1)(D)). Differences in voting rights are permitted. Differences in rights to distribution and liquidation proceeds are not.
  • [ ] Screen the cap table for instruments that could be a disguised second class: preferred stock (fatal), disproportionate distributions, SAFEs and convertible notes outside the straight-debt safe harbor of § 1361(c)(5), and side agreements altering distribution rights (Treas. Reg. § 1.1361-1(l)).

Why it matters, and the traps. Subchapter S is a hard-edged, formalistic regime. It is not a policy question whether your Berlin-based co-founder can hold shares; § 1361(b)(1)(C) says no, and the election simply does not exist. A single ineligible shareholder — one nonresident alien, one LLC on the cap table, one partnership holding a sliver — terminates or prevents S status, and the corporation is a C corporation with all the consequences that follow.

The one-class-of-stock rule is where sophisticated founders get hurt. It sounds narrow. It is not. Preferred stock is a second class, full stop, so an S corporation cannot take a priced venture round without terminating its election. Worse, the rule can be violated by conduct: if Dana takes a $40,000 distribution and Ravi takes $10,000 in the same year without a corresponding true-up, the IRS can argue the shareholders' rights to distributions are not identical. And SAFEs — the standard pre-seed instrument — are a genuinely unresolved second-class-of-stock risk in an S corporation, because they are neither equity nor straight debt within the § 1361(c)(5) safe harbor.

If an election does terminate inadvertently, § 1362(f) permits the IRS to grant relief where the termination was inadvertent, the corporation acts to fix it, and the shareholders agree to be treated as if the election never lapsed. That relief is discretionary and typically requires a private letter ruling. It is not a plan.

Vellum. Two U.S.-citizen individual founders, no trusts, no entities. Vellum passes the eligibility screen — an S election is available. But note the venture round eighteen months out. Any preferred stock kills the election. Hold that thought.

Phase 2 — Distribute or reinvest? The single biggest driver

  • [ ] Build a three-to-five-year projection of pre-tax operating profit.
  • [ ] For each year, estimate what fraction of profit will be distributed to owners versus retained in the business.
  • [ ] Compute the pass-through cost: owner's marginal ordinary rate (top federal bracket 37%), plus self-employment or Medicare tax (Phase 4), less any § 199A deduction (Phase 5), plus state income tax.
  • [ ] Compute the C corporation cost on distributed earnings: 21% entity-level tax under § 11, then qualified-dividend tax on the after-tax remainder at up to 20% plus the 3.8% net investment income tax under § 1411. Effective combined federal rate on distributed earnings: roughly 39.8%.
  • [ ] Compute the C corporation cost on retained earnings: 21%, full stop — deferred until the money comes out.
  • [ ] Flag whether accumulated earnings tax (§ 531) or personal holding company tax (§ 541) could apply to a cash-hoarding C corp.
  • [ ] Compare the two curves across the projection, not in a single year.

Why it matters, and the traps. Everything else in entity choice is a refinement of this one comparison. The C corporation carries a second layer of tax, but only when money leaves the corporation. If money never leaves — because it is reinvested in engineers, servers, and go-to-market, and the eventual payday is a sale of stock rather than a dividend — the second layer may never be paid at all.

That is why the "double taxation is bad" heuristic is wrong for high-growth companies and right for cash-flowing ones. A profitable services firm whose partners take home every dollar each year is paying 39.8% federally as a C corp and something closer to 29.6%–40.8% as a pass-through, depending on § 199A. A software company reinvesting everything is paying 21% as a C corp and 40%+ as a pass-through — on money the owners never see.

The trap on the other side: C corporation losses are trapped. Vellum's first two years of losses generate net operating losses that sit at the entity level, carried forward under § 172 (indefinitely, but limited to 80% of taxable income in the carryforward year). In a partnership or S corporation, those same losses flow out to the owners' personal returns immediately, where — subject to basis (§ 704(d), § 1366(d)), at-risk (§ 465), passive-activity (§ 469), and excess-business-loss (§ 461(l)) limits — they can shelter other income.

A second trap: the accumulated earnings tax imposes a 20% penalty on earnings retained "beyond the reasonable needs of the business." Operating companies genuinely reinvesting rarely trip it. A C corp sitting on an idle pile of cash and marketable securities can.

Vellum. Reinvest, not distribute. Two years of losses the founders would love to use personally — but those losses are small (they are paying themselves nothing), and the year-three profit is being plowed back. The retention story points hard at a C corporation. But the losses point at a pass-through. This is exactly the case Phase 3 resolves.

Phase 3 — Test for Section 1202 QSBS eligibility (and why it can dominate the analysis)

  • [ ] Confirm the issuer is a domestic C corporation — and remains one during substantially all of the holder's holding period (§ 1202(c)(1), (c)(2)).
  • [ ] Confirm the stock is acquired at original issuance from the corporation, for money, property (other than stock), or services (§ 1202(c)(1)(B)). Stock bought from another shareholder never qualifies.
  • [ ] Confirm the corporation's aggregate gross assets did not exceed the statutory ceiling at any time before the issuance and immediately after it (§ 1202(d)). Ceiling: $50 million for stock acquired on or before 4 July 2025; $75 million (inflation-indexed) for stock acquired after that date, under the amendments made by Pub. L. 119-21 (2025).
  • [ ] Confirm the active business requirement: at least 80% of assets used in the active conduct of one or more qualified trades or businesses (§ 1202(e)).
  • [ ] Screen out the excluded businesses under § 1202(e)(3): health, law, engineering, architecture, accounting, actuarial science, performing arts, consulting, athletics, financial services, brokerage services, any business whose principal asset is the reputation or skill of its employees; plus banking, insurance, financing, leasing, investing; farming; extraction; and hotels, motels, and restaurants.
  • [ ] Model the holding period. Legacy stock (acquired on or before 4 July 2025): 100% exclusion at five years. New stock (acquired after 4 July 2025): tiered — 50% at three years, 75% at four years, 100% at five years.
  • [ ] Model the cap: the greater of $10 million of gain per issuer ($15 million for post-4-July-2025 stock, indexed) or 10× the aggregate adjusted basis of the QSBS disposed of that year (§ 1202(b)(1)).
  • [ ] Consider stacking (gifts to non-grantor trusts and family members, each with their own cap) and § 1045 rollover into replacement QSBS within 60 days.
  • [ ] If the business will start as an LLC, understand the basis trap in § 1202(i)(1)(B): on incorporation, the QSBS basis is deemed to be the fair market value of the contributed property, so pre-incorporation appreciation gets no exclusion, and the 10× multiplier is measured against that stepped-up basis.

Why it matters, and the traps. Section 1202 is the reason so many companies that look like ideal pass-throughs are C corporations anyway. The math is brutal in its simplicity: a founder who holds qualifying stock for five years and sells for a $10 million gain pays zero federal tax on it. No pass-through structure produces that outcome. There is nothing to trade against a 0% rate.

But the eligibility screen is exacting, and the traps are real.

Trap one: the clock starts at issuance, not at incorporation of the idea. If Vellum operates as an LLC for two years and then converts, the founders' QSBS holding period starts on the conversion date, and — under § 1202(i)(1)(B) — the exclusion applies only to appreciation after that date. Two years of value creation are stranded outside the shelter. Founders who are even plausibly QSBS candidates should generally incorporate as a C corporation on day one, when the gross-asset test is trivially satisfied and the enterprise is worth nothing.

Trap two: the excluded-business list is a landmine for services companies. "Consulting" is read broadly. A firm whose principal asset is the reputation or skill of its people is out. A software company selling a product is in; a software company that is really a staffing shop for engineers is not.

Trap three: an S corporation cannot issue QSBS. Section 1202(c)(1) requires C corporation stock. Shares held while the corporation was an S corporation do not become QSBS when it later revokes the election; only stock issued after the revocation, by a C corporation, can qualify.

Trap four: redemptions. Section 1202(c)(3) and the regulations disqualify stock if the corporation made significant redemptions from the holder (or related persons) in the surrounding window, or made substantial redemptions from any shareholder in the two years around the issuance. Cleaning up a departed founder's shares can silently poison a subsequent issuance.

Vellum. B2B software product company, no gross assets to speak of, U.S. C corp. It is a textbook QSBS candidate. Combined with the reinvestment story from Phase 2, Phase 3 essentially decides the case: Delaware C corporation, issued at formation. The two years of pass-through losses the founders would have used are worth a few thousand dollars in tax savings; the QSBS exclusion is potentially worth millions. This is not close.

Phase 4 — Model self-employment/payroll tax across the alternatives

  • [ ] Identify which owners will work in the business and which are passive.
  • [ ] For a sole proprietorship or single-member LLC: all net earnings hit self-employment tax under §§ 1401–1402 — 12.4% Social Security up to the wage base ($176,100 for 2025), 2.9% Medicare with no ceiling, plus the 0.9% Additional Medicare Tax above $200,000/$250,000.
  • [ ] For a partnership/multi-member LLC: determine whether members are "limited partners as such" within § 1402(a)(13). Do not assume the answer.
  • [ ] For an S corporation: split each owner-employee's take into W-2 reasonable compensation (subject to FICA) and distributions (not subject to FICA or, for a materially participating owner, the § 1411 NIIT).
  • [ ] Document the reasonable-compensation determination: comparable salaries, hours, duties, revenue attributable to the owner's efforts.
  • [ ] Price the payroll infrastructure: an S corporation needs real payroll, real W-2s, real Forms 941, and a real payroll provider.
  • [ ] For a C corporation: owner-employee salary is FICA-taxed and deductible to the corporation; dividends are not deductible and not FICA-taxed.
  • [ ] Remember § 1372: a >2% S corporation shareholder is treated like a partner for fringe benefits — health insurance premiums go on the W-2.

Why it matters, and the traps. This is the classic reason a profitable, owner-operated business elects S status. If Dana's LLC earns $300,000 of net profit, essentially all of it is self-employment income. If the same business is an S corporation and Dana takes a defensible $150,000 salary and $150,000 in distributions, the second $150,000 escapes the 2.9%+ Medicare tax entirely — roughly $4,400 a year, more once the wage base is exceeded on the Social Security side.

The trap is that the savings are only as good as the salary. The IRS has litigated and won on this repeatedly. Rev. Rul. 74-44 recharacterizes distributions as wages where an S corporation pays its shareholder-employees nothing and calls it all a distribution. In David E. Watson, P.C. v. United States, 668 F.3d 1008 (8th Cir. 2012), an accountant paying himself $24,000 while taking roughly $200,000 in distributions saw the distributions recharacterized as wages, with penalties. There is no bright-line percentage; there is a facts-and-circumstances reasonableness standard, and you want a memo in the file.

The mirror-image trap sits on the partnership side. Section 1402(a)(13) excludes a limited partner's distributive share from self-employment income — but the exclusion applies to limited partners "as such," and the proposed regulations under § 1.1402(a)-2 (1997) were never finalized, leaving LLC members in a decades-long fog. The Tax Court has been closing the gap with a functional test: in Renkemeyer, Campbell & Weaver, LLP v. Commissioner, 136 T.C. 137 (2011), the court held that law-firm partners whose income derived from their own services could not use the exclusion, and in Soroban Capital Partners LP v. Commissioner, 161 T.C. No. 12 (2023), it confirmed that state-law limited partner status is not dispositive — the court will look at what the partner actually does. Do not build a plan on the assumption that an LLC member's distributive share is automatically exempt from SE tax.

Vellum. Not decisive here. Dana and Ravi will be W-2 employees of the C corporation regardless. But this phase would dominate the analysis for a two-partner consulting firm distributing everything — where an S election is often worth five figures a year.

Phase 5 — Evaluate the Section 199A deduction and the SSTB limitation

  • [ ] Confirm the business is a pass-through. Section 199A does not apply to C corporations.
  • [ ] Estimate each owner's taxable income against the § 199A threshold (roughly $197,300 single / $394,600 joint for 2025, indexed; the 2025 legislation made the deduction permanent and widened the phase-in range beginning in 2026).
  • [ ] Below the threshold: a straight 20% deduction on qualified business income, with no wage limit and no SSTB exclusion.
  • [ ] Above the threshold: apply the W-2 wage / UBIA limit — the deduction is capped at the greater of 50% of the business's W-2 wages, or 25% of W-2 wages plus 2.5% of the unadjusted basis of qualified property.
  • [ ] Above the threshold: test whether the business is a specified service trade or business (§ 199A(d)(2)) — health, law, accounting, actuarial science, performing arts, consulting, athletics, financial services, brokerage, or a business whose principal asset is the reputation or skill of its owners or employees. If so, the deduction phases out to zero.
  • [ ] Note that engineering and architecture are not SSTBs for § 199A purposes, even though they are excluded businesses for § 1202.
  • [ ] Adjust QBI downward for reasonable compensation paid to S corporation owners and for guaranteed payments to partners — both reduce QBI.
  • [ ] Compare the resulting effective rate (as low as 29.6% federal for a fully deductible pass-through) against the 21% C corporation rate on retained earnings and the ~39.8% rate on distributed earnings.

Why it matters, and the traps. Section 199A is what keeps pass-throughs competitive. A fully qualifying pass-through owner in the top bracket pays 37% on 80% of QBI — an effective 29.6% — versus 39.8% on distributed C corporation earnings. That is a real, durable advantage for a cash-distributing business.

The traps run in both directions. The SSTB cliff is the big one: a high-earning law firm, medical practice, or consulting shop gets no § 199A deduction at all above the threshold, which flattens one of the main arguments for pass-through status and — notably — is also the population that § 1202 excludes. Service professionals sit in the gap where neither shelter is available.

The subtler trap is the interaction with reasonable compensation. Paying an S corporation owner more W-2 salary saves nothing on QBI (salary is not QBI) but does raise the W-2 wage limit for owners above the threshold. Paying less salary raises QBI but shrinks the wage cap and invites a Watson problem. There is an optimum, it is business-specific, and it moves every year. Model it; do not eyeball it.

Vellum. Not available — Vellum is a C corporation. Worth recording in the file that the founders knowingly forwent § 199A in exchange for § 1202.

Phase 6 — Plan the equity compensation (options vs profits interests)

  • [ ] Decide whether employees will receive corporate equity (options, restricted stock, RSUs) or partnership equity (profits interests, capital interests).
  • [ ] If a corporation: adopt an equity incentive plan; reserve a pool; decide ISOs (§ 422 — available only to corporations, only to employees, with the $100,000 annual vesting limit and AMT exposure) versus NSOs (§ 83).
  • [ ] Obtain a § 409A valuation before granting options; grant at or above fair market value.
  • [ ] If an LLC/partnership: structure grants as profits interests under Rev. Proc. 93-27 and Rev. Proc. 2001-43 — a share of future profits and appreciation only, with zero liquidation value on the grant date, so the grant is not a taxable event.
  • [ ] Understand that a profits-interest holder becomes a partner: K-1s instead of W-2s, no employee payroll withholding, self-employment tax on their share.
  • [ ] Confirm the 83(b) election strategy for restricted stock and, prudentially, for profits interests — filed within 30 days of grant, no exceptions.
  • [ ] Compare the two systems for what your employees will actually understand and value.

Why it matters, and the traps. Equity compensation is where the "just use an LLC, it's flexible" advice quietly falls apart. LLCs cannot grant incentive stock options — § 422 requires stock of a corporation. They can grant profits interests, which are elegant tax instruments (Rev. Proc. 93-27 treats a properly structured profits interest as producing no income on grant, and Rev. Proc. 2001-43 extends that treatment to unvested profits interests where the recipient is treated as a partner from grant). But the drafting is genuinely hard, the hurdle amount must be set correctly at each grant, and the recipient loses W-2 status.

Try explaining to a senior engineer joining from a public company that instead of options she is getting a "Class B profits interest with a $4.2 million distribution threshold," that she will now receive a K-1 and must make quarterly estimated payments, and that her employer can no longer withhold her taxes. Recruiting friction is a real, if unquantified, cost.

Note also that the 30-day § 83(b) deadline is jurisdictional in practice — there is no relief, no reasonable-cause exception, no late filing. See our Founder Equity, Vesting, and the 83(b) Election: A Practical Checklist for the mechanics.

Vellum. Fifteen hires, all expecting options. The C corporation gives them ISOs. Another point on the board.

Phase 7 — Plan for outside investment (why VCs demand a Delaware C corp)

  • [ ] Ask honestly: will this business raise institutional capital in the next five years?
  • [ ] If yes, understand that venture funds will require a Delaware C corporation and will not close otherwise.
  • [ ] Understand why: funds have tax-exempt limited partners (university endowments, pension plans, foundations) that cannot take unrelated business taxable income (§§ 511–514), which flows through from an operating partnership; and foreign LPs that cannot take effectively connected income and the U.S. filing obligations that come with it. A blocker C corporation solves both.
  • [ ] Understand the second reason: preferred stock. The venture preferred stack — liquidation preference, conversion rights, protective provisions — requires multiple classes, which is fatal to an S election under § 1361(b)(1)(D).
  • [ ] Understand the third reason: § 1202 QSBS is itself a benefit the fund's own partners want.
  • [ ] If pre-seed on SAFEs or convertible notes, confirm the entity is already a C corporation — the standard instruments assume it.
  • [ ] Confirm Delaware specifically: settled case law, a specialized Court of Chancery, and investor familiarity. Delaware is a default, not a legal requirement — but deviating from it invites diligence questions.

Why it matters, and the traps. The trap here is a founder who forms an LLC "for now, we'll convert later," raises a friends-and-family round into the LLC, and then discovers at the seed term sheet stage that conversion is a legal project costing tens of thousands of dollars, requiring every member to sign, and resetting the QSBS clock and § 1202 basis floor. The "we'll convert later" plan is only cheap if it is executed very early.

The countervailing point: most businesses will never raise venture capital, and forming a C corporation for a company that will simply be profitable and distribute cash is a self-inflicted wound. Be honest about which company you are building. If the answer is a bootstrapped consultancy or a services firm, the venture argument is irrelevant and Phases 4 and 5 govern.

For the financing mechanics, see Raising Capital: A Startup Securities Toolkit and Running a SAFE Financing Round: A Practical Checklist.

Vellum. Seed round in eighteen months. Delaware C corp. The decision is now overdetermined.

Phase 8 — Check state income tax, franchise tax, and the pass-through entity tax election

  • [ ] Identify the formation state and every state where the business will have nexus (employees, offices, meaningful sales).
  • [ ] Register as a foreign entity in each state of operation; formation in Delaware does not exempt you from qualifying in your home state.
  • [ ] Price the Delaware franchise tax if incorporating there: the authorized shares method versus the assumed par value capital method. Authorize 10,000,000 shares at $0.0001 par and use APVC, or the first bill will be a shock. Delaware LLCs pay a flat $300 annual tax.
  • [ ] Price the home state's minimum tax. California charges an $800 minimum franchise tax on corporations and LLCs, plus an LLC gross-receipts fee that scales with revenue, plus a 1.5% entity-level tax on S corporations. Texas imposes a franchise (margin) tax. New York, Tennessee, and others have their own quirks.
  • [ ] Confirm the state actually respects the federal S election. Most income-tax states conform, but conformity is not universal and it is not automatic: some jurisdictions impose an entity-level tax on S corporations anyway, some require a separate state-level S election, and at least one major city (New York City) has historically taxed S corporations under its general corporation tax notwithstanding the federal election. This is state law. Check yours; do not assume.
  • [ ] Evaluate the pass-through entity tax (PTET) election, now available in the large majority of income-tax states and blessed by IRS Notice 2020-75: the entity pays state income tax and deducts it federally, and the owners take a credit — converting a capped SALT itemized deduction into an uncapped business deduction.
  • [ ] Note that PTET is available only to pass-throughs — partnerships and S corporations. A C corporation cannot use it; neither can a sole proprietor or, generally, a disregarded single-member LLC.

Why it matters, and the traps. The state layer is where theoretically elegant plans meet a $9,000 annual bill. A California-based founder who incorporates in Delaware pays Delaware franchise tax and California's $800 minimum and qualifies as a foreign corporation in California — two states, two registered agents, two filings. That is a fine trade for a company raising venture capital and a bad one for a two-person design studio.

The PTET election is the most valuable and most-missed item on this list. It is a genuine federal tax reduction for pass-through owners in high-tax states, worth real money to a profitable S corporation or partnership — and it is one more thing a C corporation cannot have. It also has hard, state-specific election deadlines, some of which fall in the first quarter of the tax year. Calendar them.

Multi-entity structures raise their own state questions; see Running Multiple Businesses Under One Structure: A Deep Dive into Holding, Operating, and Parent Companies.

Vellum. Delaware C corp, foreign-qualified in its operating state. Both franchise taxes get budgeted. APVC method elected. No PTET — that door is closed by the C corp choice, and the founders accept it.

Phase 9 — Understand the exit: asset sale vs stock sale consequences

  • [ ] Ask what the likely exit is: sale of the business, sale to a strategic acquirer, sale to management, or hold-forever cash flow.
  • [ ] Model a C corporation asset sale: corporate-level gain taxed at 21%, then a second tax on distribution of proceeds to shareholders. This is the double tax at its worst, and it is why buyers who want assets and sellers who own C corps fight.
  • [ ] Model a C corporation stock sale: single-level capital gain to shareholders — and potentially 0% federal tax if the stock is QSBS.
  • [ ] Model an S corporation asset sale: gain flows through, generally one level of tax, but ordinary-income recapture under §§ 1245 and 1250 applies, and the § 1374 built-in gains tax bites if the company was formerly a C corporation and is inside the five-year recognition period.
  • [ ] Understand the § 338(h)(10) and § 336(e) elections: a stock sale of an S corporation treated as an asset sale, giving the buyer a basis step-up.
  • [ ] Model an LLC/partnership sale: the buyer gets a basis step-up (directly, or via a § 754 election and § 743(b) adjustment); the seller gets capital gain except to the extent of "hot assets" under § 751 (inventory, unrealized receivables, depreciation recapture).
  • [ ] Recognize that buyers pay more for a structure that gives them a step-up — pass-throughs often command a purchase-price premium that partially offsets the C corp's QSBS advantage.

Why it matters, and the traps. Buyers want assets (basis step-up, no historical liabilities). Sellers of C corporations want stock (one layer of tax). This is the central tension of the middle-market deal, and entity choice determines who has leverage.

The catastrophic case: a profitable C corporation, no QSBS (perhaps because it is a consulting firm, or because the shares predate a conversion), sold in an asset deal. Gain is taxed at 21% at the corporation, and the after-tax proceeds are taxed again at up to 23.8% when distributed. Nearly 40% of the gain is gone. The same business as an LLC would have paid one layer.

The § 1374 trap deserves its own line. Converting a C corporation to an S corporation does not wash away the built-in gain. For five years after the election, any built-in gain recognized at the entity level is taxed at 21% at the corporate level and flows through to the shareholders. The double tax follows the assets for half a decade.

For deal structure and diligence, see Mergers and Acquisitions: A Comprehensive Guide from Letter of Intent to Closing, Conducting Merger and Acquisition Due Diligence: A Practical Checklist, and The Mergers and Acquisitions Toolkit.

Vellum. Stock sale in seven to ten years, QSBS held five-plus years, 100% federal exclusion up to the greater of $15 million or 10× basis per founder — with stacking through non-grantor trusts potentially multiplying that. The exit analysis confirms everything.

Phase 10 — Make the election properly (Form 2553, Form 8832) and calendar the deadline

  • [ ] Obtain an EIN before filing any election.
  • [ ] For an S election: file Form 2553, signed by every shareholder (and spouses in community property states), no later than two months and fifteen days after the beginning of the tax year the election is to take effect (§ 1362(b)(1)) — for a calendar-year taxpayer, 15 March.
  • [ ] For a newly formed entity, the clock runs from the earlier of: when it first had shareholders, first had assets, or first began doing business — not from the incorporation date.
  • [ ] For an LLC electing S status: file Form 2553 alone. Under Treas. Reg. § 301.7701-3(c)(1)(v)(C), it is deemed to include the association election. A separate Form 8832 is unnecessary.
  • [ ] For an entity classification change that is not an S election: file Form 8832, effective up to 75 days before or 12 months after the filing date.
  • [ ] Note the 60-month limitation: after an elective classification change, the entity generally cannot change again for five years (Treas. Reg. § 301.7701-3(c)(1)(iv)).
  • [ ] If the deadline is blown, evaluate late-election relief under Rev. Proc. 2013-30 — available within three years and seventy-five days of the intended effective date, with reasonable cause and consistent reporting.
  • [ ] Confirm the corresponding state election, where one is separately required (e.g., New York, New Jersey).
  • [ ] Save the IRS acceptance letter (CP261) in the permanent corporate file. Do not close the loop until it arrives.

Why it matters, and the traps. Entity elections fail for clerical reasons far more often than for substantive ones. A missing spouse signature in a community property state. A Form 2553 mailed to the wrong service center. A late filing by three days. An acceptance letter never received, never chased, and never noticed — until three years of returns filed as an S corporation are examined and the entity turns out to have been a C corporation the whole time. That is a catastrophic, expensive discovery, and it is entirely preventable by confirming receipt.

Keep the election, the acceptance letter, and the underlying consents in the corporate minute book alongside the charter and the bylaws. See Board Governance, Minutes, and Corporate Formalities: A Practical Checklist and The Startup Legal Document Stack: What Founders Need and Why.

Phase 11 — Understand the cost of converting later

  • [ ] LLC → C corporation. Generally tax-free under § 351 (contribution of assets in exchange for stock, with the transferors in control immediately after) or by statutory conversion. But: the QSBS clock restarts, and § 1202(i)(1)(B) sets the QSBS basis floor at the fair market value of contributed property, so pre-conversion appreciation is permanently outside the exclusion. Manageable — but only early.
  • [ ] C corporation → S corporation. Available by filing Form 2553, but: the § 1374 built-in gains tax applies for a five-year recognition period; the § 1375 tax on excess passive investment income applies where the corporation has accumulated E&P; and existing shares can never become QSBS.
  • [ ] S corporation → C corporation. Easy (revoke the election under § 1362(d)(1)), but the S election generally cannot be re-made for five years without IRS consent (§ 1362(g)). And existing shares still do not become QSBS — only newly issued stock can.
  • [ ] C corporation → LLC. The expensive one. This is a taxable liquidation under §§ 331 and 336: the corporation recognizes gain as if it sold every asset at fair market value, and the shareholders recognize gain on the deemed distribution. Two layers of tax on unrealized appreciation, with no cash coming in to pay them.
  • [ ] Before any conversion, run the § 1202 impact, the built-in gain exposure, and the state-law conversion or merger mechanics.

Why it matters, and the traps. Entity choice is asymmetric. Moving toward the corporate form is usually cheap; moving away from it is usually ruinous. That asymmetry should shape the default: if the answer is genuinely close, and the business may plausibly need C corporation treatment later, forming as an LLC preserves optionality at a low conversion cost — provided the conversion happens before meaningful value accrues.

The moment the business has real enterprise value, both directions get expensive: converting up strands appreciation outside § 1202; converting down triggers a double tax on it. There is a window, it is early, and it closes quietly.

Common mistakes to avoid

  1. Confusing the state-law entity with the tax classification. An LLC is not a tax status. Choose the regime first, then the wrapper.
  2. Electing S status reflexively. The S election is a genuine gift to an owner-operated, cash-distributing business. It is a straitjacket for one that will raise venture capital, grant profits interests, or issue preferred stock.
  3. Forming an LLC when the business is obviously a QSBS candidate. Every month spent as an LLC is a month of appreciation stranded outside § 1202. If venture capital and a stock sale are the plan, incorporate on day one.
  4. Paying an S corporation owner an unreasonably low salary. Watson and Rev. Rul. 74-44 are not folklore. Document the comparables.
  5. Assuming an LLC member's income is exempt from self-employment tax. Renkemeyer and Soroban say otherwise where the member actually works in the business.
  6. Missing the Form 2553 deadline — or filing it and never confirming the CP261 acceptance letter arrived.
  7. Letting a SAFE, a convertible note, or a disproportionate distribution create a second class of stock and silently terminate an S election.
  8. Ignoring the state layer. Delaware plus California means two franchise taxes, two registered agents, two sets of filings. Budget for it or don't do it.
  9. Skipping the PTET election in a state that offers it, leaving a real federal deduction on the table.
  10. Believing "we'll convert later" is free. It is cheap only while the company is worth nothing.
  11. Failing to model the exit. A C corporation asset sale can consume 40% of the gain. Know your buyer's preference before you pick a structure.
  12. Deciding once and never revisiting. Entity choice should be re-tested when profitability arrives, when investors arrive, when a state footprint changes, and when Congress rewrites the code — which it did, materially, in 2017 and again in 2025.

The consolidated entity-choice checklist

Owners and eligibility

  • [ ] Every owner mapped: individual, entity, trust, foreign person
  • [ ] No nonresident aliens, partnerships, or corporations if S status is wanted
  • [ ] ≤100 shareholders (family aggregation applied)
  • [ ] One class of stock confirmed; SAFEs, notes, and side letters screened

The core economics

  • [ ] Three-to-five-year profit projection built
  • [ ] Distribute-vs-reinvest split estimated for each year
  • [ ] Pass-through effective rate modeled (marginal rate + SE tax − § 199A + state)
  • [ ] C corporation modeled on both retained (21%) and distributed (~39.8%) earnings
  • [ ] Early-year loss utilization compared

The shelters

  • [ ] § 1202 QSBS eligibility tested: C corp, original issuance, gross-asset cap, active business, not an excluded business
  • [ ] QSBS holding-period tier and per-issuer cap modeled (legacy vs post-4-July-2025 stock)
  • [ ] § 199A tested: threshold, W-2/UBIA limit, SSTB status
  • [ ] SE tax modeled across sole proprietorship, partnership, and S corporation
  • [ ] Reasonable compensation benchmarked and documented

Structure and people

  • [ ] Equity plan designed: ISOs/NSOs versus profits interests
  • [ ] § 409A valuation obtained before any option grant
  • [ ] § 83(b) elections calendared (30 days, no relief)
  • [ ] Outside-investment plan confirmed; Delaware C corp if venture capital is realistic

State and exit

  • [ ] Formation state and all nexus states identified; foreign qualifications filed
  • [ ] Franchise/minimum taxes priced (Delaware APVC method elected if applicable)
  • [ ] State S-conformity confirmed
  • [ ] PTET election evaluated and calendared
  • [ ] Asset-sale vs stock-sale consequences modeled
  • [ ] § 1374 built-in gains exposure assessed if converting from C to S

Execution

  • [ ] EIN obtained
  • [ ] Form 2553 or Form 8832 filed on time, correctly signed
  • [ ] CP261 acceptance letter received and filed in the minute book
  • [ ] State-level election filed where separately required
  • [ ] Decision memo written and stored — including the roads not taken and why

Primary Authority

Entity classification

  • I.R.C. § 7701(a)(2), (a)(3) — definitions of partnership and corporation
  • Treas. Reg. §§ 301.7701-1, -2, -3 — the check-the-box regulations; default classifications; elective changes; the 60-month limitation
  • IRS Form 8832, Entity Classification Election
  • IRS Form 2553, Election by a Small Business Corporation

Subchapter S

  • I.R.C. § 1361 — small business corporation; eligible shareholders; the 100-shareholder limit; one class of stock; QSubs
  • I.R.C. § 1362 — election, revocation, termination; § 1362(b) (timing); § 1362(f) (inadvertent termination relief); § 1362(g) (five-year re-election bar)
  • I.R.C. § 1366 — pass-through of items; basis limitation
  • I.R.C. § 1372 — fringe benefits for 2% shareholders
  • I.R.C. § 1374 — built-in gains tax; I.R.C. § 1375 — excess passive investment income
  • Treas. Reg. § 1.1361-1(l) — one class of stock
  • Rev. Proc. 2013-30 — late S election relief
  • Rev. Rul. 74-44 — recharacterization of S corporation distributions as wages
  • David E. Watson, P.C. v. United States, 668 F.3d 1008 (8th Cir. 2012) — reasonable compensation

Partnership taxation

  • I.R.C. §§ 701–777 — subchapter K generally; § 704(d) (basis limit); § 707(c) (guaranteed payments); § 721 (nonrecognition on contribution); § 751 (hot assets); § 754 / § 743(b) (basis adjustments)
  • Rev. Proc. 93-27 and Rev. Proc. 2001-43 — profits interests

Rates, shelters, and payroll

  • I.R.C. § 11 — 21% corporate rate; I.R.C. § 1(h) — capital gains and qualified dividends
  • I.R.C. § 1202 — qualified small business stock, as amended by Pub. L. 119-21 (2025)
  • I.R.C. § 1045 — QSBS rollover
  • I.R.C. § 199A — qualified business income deduction; § 199A(d)(2) — SSTB definition
  • I.R.C. §§ 1401–1402 — self-employment tax; § 1402(a)(13) — limited partner exclusion
  • I.R.C. § 1411 — net investment income tax
  • I.R.C. § 83 — property transferred for services; § 83(b) election
  • I.R.C. § 422 — incentive stock options; § 409A — deferred compensation and option pricing
  • I.R.C. § 351 — nonrecognition on incorporation; §§ 331, 336 — corporate liquidation
  • I.R.C. § 338(h)(10), § 336(e) — deemed asset sale elections
  • I.R.C. §§ 531, 541 — accumulated earnings and personal holding company taxes
  • I.R.C. §§ 511–514 — unrelated business taxable income
  • Renkemeyer, Campbell & Weaver, LLP v. Commissioner, 136 T.C. 137 (2011)
  • Soroban Capital Partners LP v. Commissioner, 161 T.C. No. 12 (2023)
  • IRS Notice 2020-75 — state pass-through entity taxes

State law (varies — confirm your jurisdiction)

Entity formation, governance, conversion, franchise tax, and conformity to the federal S election are governed by state law. Delaware is cited below as the corporate reference point — the statute investors and their counsel expect — not as a national rule. Nothing in this section states a requirement that applies in every state.

  • Delaware General Corporation Law, tit. 8, Del. C.; Delaware Limited Liability Company Act, tit. 6, Del. C. ch. 18; Delaware franchise tax, tit. 8, Del. C. § 503
  • Model Business Corporation Act (adopted in substantial part by a majority of states)
  • Revised Uniform Limited Liability Company Act (RULLCA) and state LLC acts
  • California Revenue & Taxation Code §§ 17941, 17942, 23153 (LLC annual tax and fee; minimum franchise tax)

Secondary sources

  • Bittker & Eustice, Federal Income Taxation of Corporations and Shareholders
  • McKee, Nelson & Whitmire, Federal Taxation of Partnerships and Partners
  • Eustice & Kuntz, Federal Income Taxation of S Corporations

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This checklist is general legal information from UpLaw (uplaw.us), not legal advice, and does not create an attorney-client relationship. Federal tax classification is governed by the Internal Revenue Code and Treasury regulations; entity formation, franchise taxes, and state conformity to the federal S election vary materially by state and change over time. Dollar thresholds, rates, and indexed limits change annually. Verify current requirements and consult qualified tax counsel and an accountant before acting.