Who Can Be a Shareholder in an S Corporation?

Shareholders in an S corporation must be U.S. citizens or resident aliens, estates, certain qualifying trusts, or a narrow set of tax-exempt organizations. No partnerships, no C corporations, no other S corporations, and no nonresident aliens. The company is also capped at 100 shareholders. Get any of this wrong, even briefly, and the S election terminates automatically, dropping the business back into C corporation taxation.¹

Individuals: Citizens and Resident Aliens

The typical S corporation shareholder is an individual who is a U.S. citizen or a resident alien. The statute specifically bars nonresident aliens, so residency status matters from the day shares are issued and every day after. If a shareholder later loses resident alien status, that single change can terminate the election for the entire company.¹

The nonresident alien bar reaches further than direct ownership. In community property states, a nonresident alien spouse may be treated as having an ownership interest in shares held by the other spouse. That indirect interest is enough to disqualify the corporation.

Estates

The estate of a deceased shareholder is an eligible shareholder. This keeps the S election intact while probate runs its course, so the family isn’t forced into an immediate sale or transfer just to preserve tax status. Once the estate distributes the stock, the beneficiary who receives it has to independently qualify as an eligible shareholder on their own.²

Trusts That Can Hold S Corporation Stock

Trusts are where most inadvertent terminations happen. Only specific trust types qualify, and several of them come with hard deadlines.³

Grantor trusts. A trust treated as owned by the grantor for tax purposes is eligible during the grantor’s lifetime. After the grantor’s death, the trust remains eligible for only two years. Within that window, the stock must either be distributed to an eligible shareholder or the trust must convert to a QSST or ESBT.

Qualified Subchapter S Trusts (QSSTs). A QSST must have a single income beneficiary who is a U.S. citizen or resident alien, and it must distribute all income to that beneficiary annually. The beneficiary, not the trustee, makes the QSST election.

Electing Small Business Trusts (ESBTs). ESBTs allow multiple beneficiaries, which is what makes them more flexible than QSSTs. The trustee makes the election. S corporation income inside an ESBT is taxed at the highest individual rate rather than flowing out to each beneficiary at their own rate.

Testamentary trusts. A trust that receives S corporation stock under a will is eligible for two years from the date the stock is transferred in. After that, it must elect QSST or ESBT status, or distribute the stock out.

Voting trusts. A trust created primarily to exercise voting power over S corporation stock qualifies.

The two-year deadlines for grantor and testamentary trusts are hard. Miss them and the S election ends. Complex trusts, charitable remainder trusts, and most other trust types not on the list above cannot hold S corporation stock at all.

Tax-Exempt Organizations

Organizations described in IRC Sections 501(c)(3) and 401(a) are eligible shareholders, which covers most charities, religious organizations, and qualified retirement plans.¹

There is a tax cost. The organization’s share of S corporation income is treated as unrelated business taxable income regardless of the income’s actual source. Interest and dividend income that would normally be excluded from UBTI becomes taxable when it flows through an S corporation.⁴

Who Cannot Own Shares

The ineligible list is essentially everyone who isn’t in the categories above:

Nonresident aliens. No direct ownership, and no indirect ownership through community property rules.
Partnerships. This includes multi-member LLCs that default to partnership tax treatment.
Corporations. Neither C corporations nor other S corporations can be shareholders.
Ineligible trusts. Any trust not specifically listed as eligible.

The reasoning behind these exclusions is that S corporation income passes through to shareholders and lands on individual U.S. tax returns. Allowing entities with their own separate tax structures to hold shares would defeat the point.¹

The Single-Member LLC Exception

One workaround catches people off guard, in both directions. A single-member LLC that hasn’t elected corporate tax treatment is a disregarded entity, meaning the IRS looks straight through it to the owner.⁵ If a U.S. citizen owns a single-member LLC and that LLC holds S corporation stock, the arrangement works, because the IRS sees only the individual behind it. But if the sole member is a nonresident alien, a partnership, or a corporation, holding the stock through a disregarded LLC changes nothing. It still fails.

Corporations That Can’t Elect S Status at All

Even with a fully eligible shareholder roster, certain corporations are barred from S status outright: banks that use the reserve method of accounting, insurance companies taxed under Subchapter L, and domestic international sales corporations.²

The 100-Shareholder Cap

An S corporation cannot have more than 100 shareholders at any point. Even a brief, inadvertent breach terminates the election.¹

The family aggregation rule softens this considerably. A married couple and their estates count as one shareholder automatically. Beyond that, an extended family can elect to be treated as a single shareholder. The family group includes a common ancestor, all lineal descendants of that ancestor, and all spouses and former spouses of anyone in the group. The common ancestor can be up to six generations removed from the youngest generation of shareholders in the family, and adopted children and eligible foster children count the same as biological children.¹

For a multigenerational family business, this rule can collapse dozens of individual owners into a single count. It’s the reason some family S corporations distribute earnings to far more than 100 people while staying safely within the statutory cap.

What Happens if the Wrong Shareholder Gets In

Any violation of the shareholder eligibility rules or the 100-shareholder cap terminates the S election. Termination takes effect on the date of the disqualifying event, not retroactively to the start of the year. From that moment forward, the company is taxed as a C corporation, and its earnings get hit twice: once at the corporate level and again when distributed as dividends.

Once terminated, the corporation generally cannot re-elect S status for five tax years without IRS consent. That five-year wait applies whether the termination was intentional or purely accidental.

Relief exists for inadvertent terminations. If the disqualifying event was unintentional, the company acted promptly to fix it, and the corporation and shareholders agree to be treated as if the election had never lapsed, the IRS can waive the termination. Relief is not automatic; the corporation typically has to file a private letter ruling request. Given the alternative of five years as a C corporation, pursuing that relief is almost always worth the effort.

1
Office of the Law Revision Counsel. 26 U.S. Code 1361 – S Corporation Defined
2
Internal Revenue Service. S Corporations
3
eCFR. 26 CFR 1.1361-1 – S Corporation Defined
4
Internal Revenue Service. Publication 598 – Tax on Unrelated Business Income of Exempt Organizations
5
Internal Revenue Service. Single Member Limited Liability Companies