S Corp

An S corp—or S corporation—is a tax designation granted to certain businesses that allows them to report business income on personal income tax returns. By choosing S corp status, business owners can avoid the double taxation that C corporations are subject to.

But corporations aren’t the only business entities that benefit from S corp status. LLCs that are taxed as sole proprietorships or partnerships can instead use the tax designation to avoid paying self-employment taxes.

Filing as an S corp can be a good option for small business owners looking to bypass the federal corporate income tax; however, S corporations can come with a lot of paperwork that may make them less appealing to some.

Key eligibility requirements

To qualify for S corp status, a business must:

• Be a domestic corporation or eligible LLC
• Have no more than 100 shareholders
• Have only one class of stock
• Have shareholders who are U.S. citizens or resident aliens

These restrictions make S corps best suited for small, closely held businesses. They are not appropriate for companies planning to raise venture capital, issue preferred stock, or bring on foreign investors.

How an S corp works

A business must first be formed as a corporation or LLC at the state level. Once formed, owners file Form 2553 to elect S corp status. If approved, the business files an annual informational return (Form 1120-S), and income or losses are allocated to shareholders based on ownership percentage. Each shareholder receives a Schedule K-1 to report their share on their personal return.

Shareholders who work in the business must receive a reasonable salary subject to payroll taxes. Profits the business distributes beyond that salary are generally not subject to self-employment tax, which is the primary tax advantage of S corp status.

Why it matters

The S corp election is primarily a tax strategy. For profitable business owners who can pay themselves a reasonable salary and still have remaining profits, it reduces self-employment taxes compared to operating as a sole proprietorship, partnership, or single-member LLC. Eligible owners may also claim the Section 199A deduction, subject to IRS rules and eligibility requirements.

Beyond taxes, the S corp preserves the liability protection of a corporation; shareholders are generally not personally responsible for business debts, provided corporate formalities are maintained.

S corp vs. C corp vs. LLC

A C corp or C corporation pays corporate income tax, and shareholders may also pay tax on dividends. S corp income passes through to the owners’ personal tax returns, and no separate corporate tax applies. An S corp allows not more than 100 shareholders, while C corps have no shareholder limits. 

S corp can only issue one class of stock, and a C corp can issue multiple stock classes, making them the standard for companies seeking outside investment. An S corp's pass-through taxation benefits smaller, owner-operated businesses.

While S corp and C corp are tax designations, an LLC is a business’ entity status filed at the state level. An LLC status protects its owners’ personal liability for the losses incurred in business.

Limitations to consider

The IRS enforces the reasonable salary requirement, and underpaying to maximize distributions is a known audit trigger. S corp status is also automatically terminated if the business exceeds 100 shareholders, transfers shares to a non-resident alien, or creates a second class of stock.

State tax treatment varies. Some states recognize the federal S corp election, while others impose additional taxes or filing requirements.

Related terms

These related terms can help explain how S corp status connects to federal tax treatment, business structures, and shareholder reporting.

• Pass-through taxation: Pass-through taxation means business income, losses, deductions, and credits pass through to owners or shareholders, who report them on their personal tax returns.
• C corp: A C corp business follows double taxation rules. It means the business pays corporate tax and profits are taxed again as dividends.
• LLC: An LLC is a state-law business entity that may have different federal tax classifications depending on elections and number of members.

FAQs about S corp

When is the deadline to elect S corp status?

Form 2553 generally must be filed no more than two months and 15 days after the beginning of the tax year the election is meant to take effect, or at any time during the prior tax year. For an existing calendar-year business, that deadline is generally March 15. Late-election relief may be available if IRS requirements are met.

Is it better to form an LLC or an S corp?

These are not always competing choices. An LLC is a state-law entity, while S corp status is a federal tax election. An eligible LLC can elect S corp tax treatment without becoming a corporation under state law. Whether that makes sense depends on profits, payroll costs, owner compensation, state taxes, administrative costs, and growth plans.

Does an S corp actually save money on taxes?

It can. The S corp election is generally most beneficial when the business earns enough profit to pay the owner a reasonable salary while still distributing additional earnings. Whether it results in tax savings depends on the business’s income, expenses, and payroll obligations.