S corporation election (Form 2553): deadline, eligibility, and who should file

What an S corporation election does

A regular C corporation pays corporate income tax on its profits, and then its shareholders pay tax again on dividends they receive. That double taxation is the reason small business owners file Form 2553. The election reclassifies the entity as an S corporation under Subchapter S of the Internal Revenue Code, and the company's income, losses, credits, and deductions pass through to the shareholders, who report them on their personal returns. The entity itself generally pays no federal income tax on its operating profits.

For an LLC, the election works the same way. An LLC that does not elect otherwise is taxed as a sole proprietorship or a partnership. By filing Form 2553, the members elect to be taxed as an S corporation instead, which can be useful when the business starts generating real income and the owners want to split profit into a reasonable salary and a pass-through distribution. See the Form 2553 filing page for the deadline on your compliance calendar.

Who is eligible

The IRS is specific about who can be an S corporation. The business must be a domestic entity, and it must have only one class of stock. That means you cannot give some shareholders voting shares and others non-voting shares and still qualify, although differences in voting rights alone are generally allowed. The owners must be US citizens or resident aliens; non-resident aliens cannot be shareholders, and neither can most partnerships, corporations, or trusts. Certain trusts, such as grantor trusts and electing small business trusts, can own S corporation stock, but the rules are detailed and worth reviewing with an accountant.

The shareholder limit is the part that catches growing companies. An S corporation cannot have more than 100 shareholders. Members of the same family are counted as one shareholder for this purpose, which gives family-owned businesses room to grow. Even with that relief, a company that runs a broad employee stock plan or brings in many investors can trip the limit, and once it does, the S election terminates automatically.

The deadline you cannot miss

Form 2553 has to reach the IRS within a window tied to the tax year. For a corporation that exists at the start of its tax year, the election must be filed by the 15th day of the third month of that tax year. For a calendar year entity, that means March 15. An entity formed later in the year has more flexibility, and an entity choosing a non-calendar fiscal year has its own window. A late election is not automatically rejected. The IRS can accept it if the failure to file on time was for reasonable cause and if no one has yet relied on the entity being a C corporation, but relief is discretionary and you should not count on it.

Because the window is short and fixed to the calendar, this is exactly the kind of filing that belongs on a deadline calendar. LawDep tracks Form 2553 as an event filing that appears when you record a new entity, so the March 15 cutoff lands on the same calendar as your franchise tax and annual reports.

How to file

You file Form 2553 by mail or through the IRS e-file system. You need the entity's employer identification number (EIN, obtained on Form SS-4), the date of incorporation, the tax year you are choosing, and the names, addresses, and taxpayer identification numbers of every shareholder, who must all consent to the election in writing. The consent requirement is strict. An election without unanimous shareholder consent is invalid no matter how well the rest of the form is filled out. For an LLC, every member must consent.

The IRS also wants to know the entity's reasonable business purpose for its tax year choice if it is not a calendar year, and it asks about any prior tax classification elections the entity has made. Once the election is approved, the IRS issues a notification, and the S status is effective from the start of the tax year you elected.

What an S election does not change

Filing Form 2553 does not change your state taxes automatically. Several states do not recognize S corporation status and tax the entity as a C corporation, or they require a separate state-level election. California, for example, levies its own 1.5% franchise tax on S corporations. You should treat the federal election and the state treatment as two separate questions.

The election also does not relieve the company of payroll obligations. An S corporation owner who works in the business must be paid a reasonable salary, with payroll taxes withheld, before any pass-through profit is distributed. The IRS watches for owners who take all profit as a distribution and no salary, because that avoids Social Security and Medicare taxes. If the salary is clearly below market, the IRS can recharacterize the distribution as wages and impose the payroll taxes plus penalties.

The LLC election in particular

For an LLC, the S election is a two-step process that trips up more filers than the corporation version. First, the LLC must elect to be taxed as a corporation by filing Form 8832, the entity classification election. Only after the entity is treated as a corporation can it file Form 2553 to elect S status. The two forms have different deadlines, and a common mistake is filing Form 2553 without the Form 8832, or filing them in the wrong order. The classification election must be effective before the S election takes effect, and the IRS will not accept an S election for an entity it still treats as a partnership. See the Form 8832 page and the Form 2553 page for the deadlines.

The practical sequence is to file Form 8832 first, wait for it to be accepted, then file Form 2553 within the S election window. In practice many teams file both at once and sort out the order with a cover letter, but the safe route is sequential. An LLC that misses the S window can rely on late-election relief, but again the relief is discretionary and the taxpayer bears the burden of showing reasonable cause.

Keep it on the calendar

The S corporation election is a one-time filing, but it sits at the start of a chain of annual obligations that follow it. Once the election is effective, the company files a Form 1120-S every year, issues K-1s to shareholders, and continues to file payroll and franchise tax returns. LawDep tracks Form 2553, the annual 1120-S, and the supporting filings on one rolling calendar, so the election date is not just a file and forget event. Generate a free calendar to see how the full set of US business filings lines up.

General information, not tax advice. Confirm eligibility and timing with your accountant before filing.