Who Can Own S Corp Stock: Shareholders, Trusts, and Estates

Ownership of S corporation stock is limited by federal tax law to a short list of eligible holders: individual U.S. citizens and resident aliens, four specific types of trusts, decedents’ estates, bankruptcy estates, and a narrow group of tax-exempt organizations. The total shareholder count cannot exceed 100 at any point in the tax year, and every share must belong to someone who fits one of those categories. Anyone outside the list — a nonresident alien, a partnership, a C corporation, an IRA — cannot hold even a single share without terminating the corporation’s S election.¹

Individual Shareholders: Citizens and Resident Aliens

Any human being who is a U.S. citizen can own S corporation stock. So can a resident alien. No other individual qualifies.

The IRS uses two tests to decide whether a non-citizen is a resident alien for tax purposes. The Green Card Test is straightforward: if you hold a lawful permanent resident card, you pass. The Substantial Presence Test uses a weighted count of days physically in the United States across three calendar years. You must be present at least 31 days in the current year, and the weighted total must reach 183. Current-year days count fully, prior-year days count as one-third, and days from two years back count as one-sixth.²³

A nonresident alien cannot own even one share. If one does, the S election terminates on that date. This is where quiet failures happen: a shareholder moves abroad, a green card lapses, or stock passes to a spouse who doesn’t have residency status. Each individual shareholder provides a Social Security number or ITIN so the corporation can issue a Schedule K-1.⁴

Trusts That Can Hold S Corporation Stock

Trusts are eligible only if they fit one of four specific categories in the tax code. Each has its own structure and tax treatment.

Qualified Subchapter S Trust (QSST)

A QSST has one current income beneficiary, who must be a U.S. citizen or resident alien, and it must distribute all of its income to that beneficiary each year.⁵ The beneficiary makes the QSST election and is treated as the owner of the stock for tax purposes, reporting the S corporation income on their individual return. A QSST cannot serve multiple beneficiaries at once.

Electing Small Business Trust (ESBT)

An ESBT can have multiple beneficiaries and is not required to distribute all income annually. Every beneficiary must be an individual, an estate, or a qualifying charitable organization. No interest in the trust can be acquired by purchase; each beneficiary’s interest must come through gift, bequest, or a similar non-sale transfer.⁶

The trade-off is tax cost. The ESBT itself pays tax on the S portion of its income at the highest individual rate, which for 2026 is 37 percent, with no graduated brackets.⁷⁸

Grantor Trusts

A grantor trust qualifies as long as the grantor is a U.S. citizen or resident. The IRS treats the grantor as the owner of the stock. Revocable living trusts, the most common estate planning vehicle, typically fall here.

At the grantor’s death, the trust stops being a grantor trust and can continue holding the stock for only two years from the date of death.⁹ Before that window closes, the shares must be distributed to an eligible shareholder or the trust must convert to a QSST or ESBT with a timely election.

Testamentary Trusts

A trust created by a will can hold S corporation stock, but only for two years starting on the date the shares are transferred in.¹⁰ Before those two years run out, the trustee must distribute the shares to eligible individual shareholders or convert to a QSST or ESBT.

Estates

A decedent’s estate can hold S corporation shares while the estate is under administration. There is no fixed statutory deadline, but keeping an estate open indefinitely to hold stock invites IRS scrutiny. Once administration wraps up, the shares must go to an eligible shareholder.¹

A bankruptcy estate of an individual shareholder is also a permitted owner during the bankruptcy proceedings, so a shareholder’s personal financial trouble doesn’t automatically wreck the tax status for everyone else on the register.

Tax-Exempt Organizations

A narrow group of tax-exempt entities can hold S corporation stock: charitable organizations described in Section 501(c)(3) and certain employee benefit trusts, including those used in employee stock ownership plans. The organization’s share of S corporation earnings is treated as unrelated business taxable income and is taxed accordingly.¹

Worth flagging because it catches planners off guard: charitable remainder trusts, both annuity and unitrust varieties, are barred from ESBT status and are not otherwise listed as eligible shareholders.

Who Cannot Own S Corporation Stock

The prohibited list is broad, and the moment stock lands in the wrong hands the S election terminates.

C corporations. A corporation taxed under Subchapter C cannot hold shares.
Partnerships, whether general or limited.
Multi-member LLCs, because the IRS treats them as partnerships by default.
Nonresident aliens.
IRAs, both traditional and Roth. Transferring shares into an IRA terminates the election on the transfer date.¹¹

The IRA prohibition trips up business owners more often than expected. Someone consolidating retirement accounts, or chasing tax-advantaged growth on closely held stock, discovers too late that the transfer killed the S election for every shareholder, not just their own.¹²

The Single-Member LLC Workaround

There is one path for LLC ownership. A single-member LLC that has not elected corporate tax treatment is a disregarded entity: the IRS looks through it to the individual owner. If that owner is a U.S. citizen or resident alien, the stock is treated as owned by them directly, and S corporation eligibility is preserved. The LLC gives the owner liability protection without creating a prohibited shareholder. If the single-member LLC elects corporate taxation, it becomes prohibited and the election ends.

The 100-Shareholder Cap and Family Counting

An S corporation cannot have more than 100 shareholders at any point in the tax year.¹² The real capacity is much larger because of how families are counted. A married couple is always one shareholder, regardless of how the stock is divided. Beyond that, an entire family — a common ancestor, all lineal descendants of that ancestor, and the spouses or former spouses of those descendants — counts as one shareholder.¹³

The common ancestor cannot be more than six generations removed from the youngest generation of family shareholders. A large family business can have dozens of relatives on the share register while occupying a single slot toward the cap. Every family member still has to individually meet the citizenship or residency requirement.

What Happens When an Ineligible Person Ends Up Holding Stock

When an ineligible shareholder acquires stock, when the count exceeds 100, or when the ownership rules are otherwise broken, the S election terminates on the date of the violation.¹⁴ There is no grace period and no warning letter. The tax year splits: income before the violation is taxed under S rules, and everything after is taxed as a C corporation.¹⁵ The company then pays corporate income tax on its earnings, and distributions become dividends subject to a second layer of tax. Once terminated, the corporation generally cannot re-elect S status for five tax years without IRS consent.

If the termination was genuinely inadvertent, the IRS has authority under Section 1362(f) to treat the election as if it never ended. Relief requires four things: the termination was inadvertent, the corporation took corrective steps within a reasonable time after discovering the problem, the corporation and every affected shareholder agree to whatever adjustments the IRS requires, and the IRS is satisfied the circumstances weren’t planned. Getting that relief means requesting a private letter ruling, which carries a substantial user fee.¹⁶ Narrow automatic relief exists under Revenue Procedure 98-55 for certain trust-related failures, such as a missed QSST or ESBT election, as long as everyone reported income consistently with S corporation status.¹⁷

Because the categories are narrow and the consequences immediate, every transfer of S corporation stock — a sale, a gift, an estate distribution, a divorce settlement, a rollover — deserves a check against the eligibility rules before the transfer happens, not after.

1
Office of the Law Revision Counsel. 26 USC 1361 S Corporation Defined
2
Internal Revenue Service. Publication 519 U.S. Tax Guide for Aliens
3
Internal Revenue Service. Determining an Individual’s Tax Residency Status
4
Internal Revenue Service. 2025 Shareholder’s Instructions for Schedule K-1 Form 1120-S
5
Internal Revenue Service. Private Letter Ruling 202529002
6
Office of the Law Revision Counsel. 26 USC 1361 S Corporation Defined
7
Internal Revenue Service. 2026 Form 1041-ES
8
Internal Revenue Service. TD 8994 Electing Small Business Trust
9
Internal Revenue Service. Private Letter Ruling 202614003
10
eCFR. 26 CFR 1.1361-1 S Corporation Defined
11
Internal Revenue Service. Private Letter Ruling 202310008
12
Internal Revenue Service. S Corporations
13
Office of the Law Revision Counsel. 26 U.S. Code 1361 S Corporation Defined
14
Office of the Law Revision Counsel. 26 USC 1362 Election Revocation Termination
15
eCFR. 26 CFR 1.1362-3 Treatment of S Termination Year
16
Internal Revenue Service. Internal Revenue Bulletin 2026-1
17
Internal Revenue Service. Revenue Procedure 98-55