S Corporation Restrictions: Shareholders, Stock, and Distributions

S corporation restrictions cover six main areas: who can own shares, how many shareholders you can have, how the stock is structured, how shareholders are paid, how distributions are made, and what tax year the company uses. Break any of them and the IRS can terminate your S election, often back to the date the problem started, which drops the company into C corporation status and double taxation. S corp status is a federal tax election rather than a type of entity, and the price of the pass-through treatment is a long list of qualifying conditions that have to stay satisfied every single day.

Who Can Make the Election

Only a domestic corporation, or a domestic entity eligible to be treated as one, can elect S status. You file Form 2553 no later than two months and 15 days after the start of the tax year you want the election to take effect, or at any point during the preceding tax year.¹ Miss that window and you stay a C corp for the year unless you qualify for late-election relief.

A handful of corporations are shut out permanently: insurance companies taxed under Subchapter L, financial institutions using the reserve method for bad debts, and current or former DISCs.² Every other eligibility requirement has to be satisfied on the effective date of the election. If any requirement fails, the election is void.

Shareholder Limits and Who Can Own Shares

An S corporation can have no more than 100 shareholders.³ That cap is less tight than it sounds. A married couple and their estates count as one shareholder. All members of a family count as one shareholder as long as they descend from a common ancestor no more than six generations removed from the youngest shareholder generation, and the definition pulls in spouses, former spouses, and legally adopted or foster children.² Family businesses can keep adding relatives without bumping the ceiling.

The list of eligible shareholders is short: U.S. citizens and resident aliens, estates, certain qualifying trusts, and tax-exempt organizations described in sections 401(a) and 501(c)(3).² Qualified retirement plans and charities can hold S corp stock, which many owners miss.

Everyone else is barred. Partnerships, LLCs taxed as partnerships, C corporations, other S corporations, and nonresident aliens cannot own shares.³ This is the restriction that causes the most accidental terminations. A shareholder who moves abroad and loses U.S. resident status, or an estate that distributes shares to an ineligible beneficiary, can destroy the election for the entire corporation.

Trusts need extra care. Only certain kinds can hold S corp stock: grantor trusts, voting trusts, qualified subchapter S trusts (QSSTs), and electing small business trusts (ESBTs). A QSST must have one income beneficiary and distribute all S corp income annually. An ESBT can have multiple beneficiaries but pays tax on the S corp income at the highest individual rate. When a grantor of a grantor trust dies, the trust stays eligible for up to two years before it has to convert to a QSST or ESBT or get rid of the shares.

One Class of Stock

An S corporation can issue only one class of stock. Every outstanding share has to carry identical rights to distributions and liquidation proceeds.² Voting differences are the only allowed variation: voting and non-voting common stock is fine. The moment any agreement hands one group of shareholders a larger slice of profits or a priority claim in liquidation, the IRS treats that as a second class and the election terminates.

Shareholder loans can trip the same wire. If the IRS recharacterizes a shareholder loan as equity and that equity has rights different from the common stock, the company has a second class on its hands. The tax code offers a “straight debt” safe harbor to prevent this. Qualifying debt must be a written, unconditional promise to pay a fixed dollar amount on demand or by a specific date. The interest rate and payment dates cannot depend on corporate profits or borrower discretion, the debt cannot be convertible into stock, and the creditor must be an eligible S corp shareholder or an active lending business.⁴ Debt that checks every box is safe even if it looks equity-like.

Distributions Have to Be Pro Rata

Every distribution has to go out in exact proportion to each shareholder’s ownership percentage. A 40% owner gets 40% of every distribution, every time.⁵ The same rule governs allocations of income, losses, deductions, and credits. There’s no room for the special allocations or flexible profit-splitting that partnerships and multi-member LLCs can use.

Disproportionate distributions do more than irritate shareholders. They violate the single-class-of-stock requirement, which means the election terminates as of the date of the violation. A 2024 Tax Court case held an S corp founder liable for taxes on income he never actually received, because the corporation had overdistributed to the other shareholders. Track every dollar leaving the corporation and make sure the math stays proportional.

Reasonable Compensation for Shareholder-Employees

Any shareholder who performs more than minor services for the corporation has to receive a W-2 salary reflecting fair market value before taking distributions.⁶ The IRS watches this closely because the incentive to cheat is obvious. Salaries carry Social Security and Medicare tax; distributions do not. Paying yourself a token salary and pulling the rest as distributions is the single fastest way to invite an S corp audit.

A shareholder’s stated intent to limit their own salary doesn’t matter. What matters is whether the compensation reasonably reflects the services actually performed.⁷ The IRS weighs the officer’s training and experience, duties and hours, what comparable businesses pay for similar roles, dividend history, and what the corporation pays non-shareholder employees. If your rank-and-file staff earn more than you do for similar work, that’s a red flag. When the IRS reclassifies distributions as wages, the corporation owes back employment taxes plus interest and penalties.

The 2% Shareholder Fringe Benefit Rule

Any shareholder who owns more than 2% of the stock, counting direct and constructive ownership, is treated like a partner in a partnership for fringe benefit purposes.⁸ Benefits that regular employees receive tax-free, like employer-paid health insurance, group-term life insurance over $50,000, and dependent care assistance, become taxable income for these shareholders.

Health insurance is where this bites hardest. The corporation has to include the premiums it pays for a 2%-or-greater shareholder in that person’s W-2 Box 1 wages for income tax purposes. The premiums are not subject to Social Security or Medicare tax, so they stay out of Boxes 3 and 5. The shareholder then claims the self-employed health insurance deduction on their personal return. Botching the W-2 reporting either generates unnecessary payroll tax or costs the shareholder the deduction entirely.

Required Tax Year

S corporations have to use a calendar year ending December 31 unless they have a legitimate reason to do otherwise.⁹ The point is to stop shareholders from deferring income by using a fiscal year that ends well before their personal returns are due. The only exits are a Section 444 election, which requires a deposit to offset the deferral, or convincing the IRS Commissioner that a real business purpose supports a different year-end.¹⁰ Most S corps stick with December 31.

Extra Taxes for Former C Corporations

Two corporate-level taxes apply to S corporations that used to be C corporations and still carry accumulated earnings and profits from those years. They exist to stop companies from converting to S status just to dodge corporate tax on money earned or gains built up while they were C corps.

Excess Passive Income Tax

If more than 25% of gross receipts come from passive sources like interest, dividends, rents, royalties, or annuities, and the corporation still holds C corp earnings and profits, the corporation owes a corporate-level tax on the excess passive income at the highest corporate rate, currently 21%.¹¹ Three consecutive years of excess passive income automatically terminates the election on the first day of the next tax year.¹² The simplest fix is to distribute the accumulated C corp earnings and profits. Once they’re gone, the test no longer applies.

Built-In Gains Tax

Assets that appreciated while the company was a C corp carry a built-in gain into the S era. Sell those assets within five years of the election and the corporation owes tax on the net recognized built-in gain at the highest corporate rate, currently 21%.¹³ The five-year recognition period was made permanent by the PATH Act of 2015. After five years, old C corp gains stop triggering the extra tax. Corporations that have always been S corps never owe it.

Loss Deduction Limits for Shareholders

A shareholder who wants to deduct S corp losses on a personal return faces four limitations, applied in order. A loss has to clear each hurdle before the next one matters.¹⁴

Basis limitation. You cannot deduct losses in excess of your combined stock basis and debt basis. Stock basis starts with what you paid for shares and moves with income allocations, contributions, and other items. Debt basis comes from loans you personally make to the corporation. Losses above basis carry forward indefinitely, but they expire for good if you sell your stock with basis still at zero.
At-risk limitation. Even with enough basis, you can only deduct losses up to the amount you’re personally at risk for. That generally covers cash and property you contributed plus borrowings for which you’re personally liable. Nonrecourse loans secured only by your S corp stock don’t count.
Passive activity limitation. If you don’t materially participate in the business, your losses are passive and can only offset other passive income. Suspended passive losses release when you dispose of your entire interest to an unrelated party.
Excess business loss limitation. For tax years beginning before 2029, aggregate business losses above $305,000 for single filers or $610,000 for joint filers (adjusted annually for inflation) are disallowed for the year. The excess becomes a net operating loss carryforward.

Shareholders report basis on Form 7203, which the IRS requires with the individual return whenever a shareholder claims a loss, takes a distribution, disposes of stock, or receives a loan repayment.¹⁵

States Don’t All Follow the Federal Election

The S election is federal, and states aren’t bound by it. Most states honor the election and tax S corp income only at the shareholder level, but a meaningful number impose their own entity-level taxes on S corporations, from minimum franchise taxes to flat income taxes on S corp earnings. A few jurisdictions don’t recognize the election at all for state purposes. An S corporation operating across state lines has to check each state’s treatment on its own rather than assuming the federal pass-through carries over.

What Happens When the Election Terminates

Violating any restriction, whether it involves shareholder eligibility, the stock structure, or the passive income test, terminates the election. Termination is often retroactive to the date of the disqualifying event, so the corporation flips back to C corp status and faces double taxation from that date forward.

After termination, the corporation cannot re-elect S status for five tax years beginning after the first year the termination took effect.¹⁶ The IRS can waive the waiting period, but only if the corporation shows the terminating event was outside its reasonable control and wasn’t part of a plan to end the election. A change in majority ownership, meaning more than 50% of stock held by people who weren’t owners at the time of termination, helps the case for a waiver.

For genuinely inadvertent problems, like governing documents that accidentally create disproportionate distribution rights, Section 1362(f) offers relief. The corporation has to show the termination was inadvertent, that it and its shareholders acted in good faith, and that everyone filed tax returns consistent with S corp status. The traditional path is a private letter ruling, which has historically carried a user fee of $38,000 or more. The IRS has also published streamlined procedures that let corporations self-correct common errors, such as defective operating agreements, without a private letter ruling, provided the IRS hasn’t already flagged the issue and no disproportionate distributions were actually made.

A late Form 2553 can also be rescued. Revenue Procedure 2013-30 grants automatic relief when the only mistake was missing the filing deadline, all shareholders reported their income as if the election were in place, and the IRS has not flagged the issue within six months of the first S corp return being filed.¹⁷ That relief has no outside time limit as long as those conditions hold.

1
Internal Revenue Service. Instructions for Form 2553
2
Office of the Law Revision Counsel. 26 U.S. Code 1361 – S Corporation Defined
3
Internal Revenue Service. S Corporations
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Office of the Law Revision Counsel. 26 USC 1361 – S Corporation Defined
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eCFR. 26 CFR 1.1377-1 – Pro Rata Share
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Internal Revenue Service. S Corporation Employees, Shareholders and Corporate Officers
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Internal Revenue Service. Wage Compensation for S Corporation Officers
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Office of the Law Revision Counsel. 26 U.S. Code 1372 – Partnership Rules to Apply for Fringe Benefit Purposes
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eCFR. 26 CFR 1.1378-1 – Taxable Year of S Corporation
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Internal Revenue Service. About Form 8716, Election to Have a Tax Year Other Than a Required Tax Year
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eCFR. 26 CFR 1.1375-1 – Tax Imposed When Passive Investment Income of Corporation Having Subchapter C Earnings and Profits Exceeds 25 Percent of Gross Receipts
12
Office of the Law Revision Counsel. 26 U.S. Code 1362 – Election; Revocation; Termination
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Office of the Law Revision Counsel. 26 U.S. Code 1374 – Tax Imposed on Certain Built-In Gains
14
Internal Revenue Service. S Corporation Stock and Debt Basis
15
Internal Revenue Service. About Form 7203, S Corporation Shareholder Stock and Debt Basis Limitations
16
Office of the Law Revision Counsel. 26 USC 1362 – Election; Revocation; Termination
17
Internal Revenue Service. Revenue Procedure 2013-30