What Is an S Corporation?

Definition & Examples of an S Corporation

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An S corporation is a special kind of tax status that corporations or limited liability companies can select. S corporation status doesn't alter the business operations, but it moves the tax burdens from the business to the owners themselves.

Learn how an S corporation pays taxes, why it can be beneficial to pay taxes this way, how to select S corporation status, and some pros and cons of S corporations.

What Is an S Corporation?

S corporations are corporations that decide on an alternate way to pay yearly income taxes. Instead of the corporation paying the tax itself, the company’s income, losses, deductions, and credits are paid by the owners. 

Limited liability companies (LLCs) may also elect taxation as an S corporation. 

  • Alternate names: Small business corporation, subchapter S corporation, S corp


The term “S corporation” doesn’t mean small; it’s named for a specific part of the Internal Revenue Code. 

How Does an S Corporation Work? 

An S corporation operates like any other corporation—it has bylaws, shareholders, and a board of directors. The only difference is in the way the S corp pays taxes. A corporation pays income taxes at the corporate tax rate of 21% on its retained earnings (profits kept in the business). With S corp tax status, the owners (shareholders) pay the corporation’s taxes through their personal tax returns (called pass-through taxes). 

To report income taxes, the S Corporation files an information tax return using Form 1120-S. The S corporation also files a Schedule K-1 for each owner with the Internal Revenue Service (IRS). The Schedule K-1 form shows how much annual income the owner received from the business, and this income is used to calculate the owner’s total income tax bill.


"Most of the small businesses I deal with are still electing S corp status even though the corporate rate is 21% and the top individual rate is 37%,” CPA Gail Rosen told The Balance via email. “This is because most small companies are in business to pay themselves a salary, not to keep money in their business. The 21% corporate rate only applies to the profit you leave in your company.” 

Requirements for an S Corporation

“There are two paths to becoming an S corporation, one for a business that is a corporation and one for LLCs,” Rosen said via email. “Both paths include a process called an ‘election’ to be taxed as an S corporation.” 

Before becoming an S corporation, a business must meet specific tests. The potential S corporation must:

  • Be a domestic corporation (registered within the U.S.)
  • Have no more than 100 shareholders
  • Have shareholders that are persons, estates, or trusts
  • Not have partnerships, corporations, or non-resident alien shareholders 
  • Only have one class of stock (common stock)

After ensuring that they meet the requirements, the company must then file a form with the IRS to choose S corporation status.

The company must make the election no more than two months and 15 days after the beginning of the tax year when the election is to take effect, but it can also make the election at any time during the year before.

For example, let’s say your company’s tax year ends on December 31. If you started the business on Jan. 1, 2020, and you want to make the election in 2020, you must do it no later than March 15, 2020. If you want to make the election for 2021, you can do it any time in 2020, but no later than March 15, 2021.   

Pros and Cons of S Corporations

  • Limited liability for owners

  • Additional tax deduction for owners

  • Avoids double taxation for owners

  • Only allows for one type of stock

  • Limited tax year options

  • IRS oversight of owner pay

Pros Explained

  • Limited liability for owners: S corporations, like LLCs and corporations, are separate legal entities, which means owners have limited liability for the S corporation's debts and lawsuits—as long as they follow IRS rules.
  • Additional tax deduction for owners: S corporation owners, like owners of LLCs, may be eligible for a 20% qualified business income (QBI) deduction from their share of the S corp income. This benefit is in addition to the normal tax deductions the business takes. Corporate owners aren’t eligible for this benefit. 
  • Avoids double taxation for owners: Most businesses form an S corporation to avoid the double taxation dilemma of businesses formed as corporations. Double taxation for a corporation means that owners are taxed twice—once on the income of the business and again on income distributed to owners in the form of dividends. 

Cons Explained

  • Only allows for one type of stock: Only one type of stock is allowed for S corporations, and there are restrictions on types of owners. These limitations don't apply to corporations.
  • Limited tax year options: An S corporation must have a December 31 fiscal year-end unless it has a good reason for a different year-end and gains approval from the IRS.
  • IRS oversight of owner pay: The IRS watches closely to see that S corporation owners working in the business are being paid reasonable compensation for their services as employees so they can’t avoid paying taxes. S corp owners must also report and pay their share of FICA tax (Social Security/Medicare) on this income. 

  • S corporations are a type of corporation with special tax status.
  • A major benefit of S corp status is that owners avoid double taxation. 
  • Small U.S. corporations and LLCs can select this tax status by filing an election form with the IRS.
  • The business continues to operate as before; only the tax reporting and payment are different. 
  • S corporation owners must take a reasonable salary. 
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The Balance uses only high-quality sources, including peer-reviewed studies, to support the facts within our articles. Read our editorial process to learn more about how we fact-check and keep our content accurate, reliable, and trustworthy.
  1. Internal Revenue Service. "S Corporations." Accessed Sept. 5, 2020.

  2. Internal Revenue Service. "Instructions for Form 2553 Election by a Small Business Corporation," Page 1. Accessed Sept. 5, 2020.

  3. Internal Revenue Service. "Qualified Business Income Deduction." Accessed Sept. 5, 2020.

  4. Internal Revenue Service. "Accounting Periods and Methods," Page 6. Accessed Sept. 5, 2020.

  5. Internal Revenue Service. "Wage Compensation for S Corporation Officers." Accessed Sept. 5, 2020.

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