The short answer: An S corporation is not a type of company but a federal tax election. A corporation or an eligible LLC files Form 2553 with the IRS and is then taxed under Subchapter S: it generally pays no corporate income tax, and its profit passes through to shareholders on Schedule K-1. Owners who work in the business take a reasonable W-2 salary, and profit above that can be paid as distributions that are free of self-employment tax. It is limited to 100 eligible US shareholders and one class of stock.
An S corp keeps the liability shield of a corporation while avoiding the second layer of tax. Here is how it works, who qualifies, how it compares with an LLC and a C corp, and how to set one up.
Key Takeaways
- Tax status, not an entity: you form a corporation or LLC, then elect S status on Form 2553.
- Taxed once: profit and losses pass through to shareholders on Schedule K-1.
- Salary first: working owners must take a reasonable W-2 salary before distributions.
- Payroll tax savings: distributions above the salary are not hit with self-employment tax.
- Strict ownership rules: up to 100 shareholders, US citizens or residents only, one class of stock.
- Deadlines: Form 1120-S is due March 15; late filing costs $260 per shareholder per month.
What Is an S Corporation?
An S corporation is not a type of company you register with the state. It is a federal tax election. You first form a corporation, or in many cases an LLC, under state law, and then ask the IRS to tax that entity under Subchapter S of the Internal Revenue Code by filing Form 2553. Once the election is accepted, the entity is treated as an S corp for federal tax purposes.
The defining feature is pass-through taxation. A standard corporation, a C corporation, is taxed twice: once on its profit at the corporate level, and again when shareholders receive dividends. An S corp avoids the second layer. It generally pays no federal income tax of its own; its profit, losses, deductions and credits flow through to shareholders, who report them on their personal returns and pay tax at their own rates.
How an S Corp Works
Five features define how an S corporation operates, from how it is set up to how its owners get paid.
1. Formation and Election
The business is registered with the state as a corporation or an LLC. It then files Form 2553 with the IRS, provided it meets the eligibility rules. Without the election, a corporation is taxed as a C corporation and an LLC keeps its default treatment.
2. Ownership and Management
Shareholders own the S corp through their shares. In a corporation, they elect a board of directors, and the board appoints officers to run daily operations. An LLC taxed as an S corp keeps its own management structure under its operating agreement.
3. How Owners Are Paid
An S corp can pay its owners a salary, distributions, or both. An owner who works in the business must be paid a reasonable salary through payroll, with income tax and FICA withheld. Profit taken beyond that salary can be distributed, and distributions are not subject to self-employment or payroll tax.
4. Pass-Through Taxation
The S corp files Form 1120-S each year but generally pays no federal corporate income tax. Each shareholder receives a Schedule K-1 and reports their share of income, deductions and credits on their own return, whether or not the cash was distributed. A loss can pass through too, up to the shareholder’s basis in their stock and loans to the company. Eligible shareholders can also claim the 20% qualified business income deduction on their share of profit.
5. Limited Liability
Like any corporation or LLC, an S corp gives its shareholders limited liability. Their personal assets are generally protected from the company’s debts, except for debts they personally guarantee or harm they cause themselves.
Benefits and Drawbacks of an S Corp
S corp status has real advantages, but it does not suit every business. Here is the honest balance sheet.
Benefits
- No double taxation. Profit is taxed once, at the shareholder level, not at both the corporate and shareholder levels.
- Losses pass through. A loss can flow to shareholders and may offset other income on their personal returns, within basis and other limits.
- Lower self-employment tax. Profit distributed above a reasonable salary is not subject to the 15.3% self-employment tax. See the worked example below.
- Limited liability. Shareholders are generally protected from business debts and lawsuits.
- An incorporated business can carry more weight with customers, suppliers, lenders and new hires.
- The company continues if an owner leaves or dies.
- Ownership transfer. Shares can be sold or gifted fairly easily, as long as the new owner is an eligible shareholder; a transfer to an ineligible owner ends the S election.
Drawbacks
- Shareholder limits. No more than 100 shareholders, all US citizens or residents or other eligible holders, which limits how widely it can raise money.
- One class of stock. No preferred shares, which most venture investors expect.
- Higher tax in some cases. A very profitable company that reinvests most of its profit may pay less as a C corporation at the flat 21% corporate rate than its owners would pay at top individual rates.
- The reasonable salary test. Working owners must take a salary the IRS would accept as reasonable. Setting it too low is a common audit issue.
- Running costs. Payroll, a separate Form 1120-S, K-1s and state filings all add cost every year.
- Bylaws, regular meetings, minutes and detailed records are expected of a corporation.
- Rigid profit allocation. Profit and losses must be split strictly by ownership percentage; you cannot give one owner a bigger share by agreement.
- Loss limits. A shareholder can deduct losses only up to their basis in stock and direct loans to the company.
- State rules differ. Some states tax S corps directly (California charges 1.5% of net income with an $800 minimum), and New York City does not recognize the election at all.
- Conversion tax. A former C corporation that elects S status can owe built-in gains tax if it sells appreciated assets within five years.
Worked Example: How Much Can an S Corp Save?
Priya runs a consulting business that earns $150,000 of profit. As a sole proprietor or a single-member LLC, all of it is subject to self-employment tax. If she elects S corp status and pays herself a $70,000 salary, only the salary bears payroll tax.
| Sole proprietor or SMLLC | S corp with $70,000 salary | |
|---|---|---|
| Business profit | $150,000 | $150,000 |
| Owner's W-2 salary | None | $70,000 |
| Earnings subject to SE or payroll tax | $138,525 (92.35% of profit) | $70,000 |
| Self-employment or FICA tax | $21,194 | $10,710 |
| Rough difference | About $10,500 less, before costs |
The roughly $10,500 difference is not all savings. Against it, Priya pays for a payroll service and a separate 1120-S return, any state S corp tax or fees, and state unemployment tax on her salary. The deduction for half of self-employment tax and the employer’s share of FICA also change her income tax a little. Most important, $70,000 has to be a salary the IRS would accept for her role and hours. For how the payroll side works, see FICA and self-employment tax explained.
Wondering whether an S corp election would save you money?
Book a free 30-minute call with a Countsure CPA. We will run the numbers on your own profit, a defensible salary and your state’s rules.
IRS Eligibility Rules for an S Corp
Not every business can elect S corp status. The IRS sets these conditions, and all of them must be met.
- Domestic entity: a corporation, or an LLC eligible to be taxed as one, formed under the laws of a US state or territory.
- 100 shareholders or fewer: members of one family can be counted as a single shareholder.
- Eligible shareholders only: individuals who are US citizens or residents, certain trusts and estates, and certain tax-exempt organizations. Partnerships, corporations and non-resident aliens cannot hold shares.
- One class of stock: every share must have the same rights to distributions and liquidation proceeds, although voting rights may differ.
- Not an ineligible business: certain financial institutions, insurance companies and domestic international sales corporations cannot elect.
- A timely election: Form 2553, signed by every shareholder, filed no later than 2 months and 15 days after the start of the tax year the election should take effect, or at any time in the prior year.
If Form 2553 is filed late, S status starts the following year unless the IRS grants relief. Rev. Proc. 2013-30 allows late-election relief in many cases, generally within 3 years and 75 days of the intended effective date, if the company has reasonable cause and has acted as an S corp.
Worked example: a corporation formed in 2026 on a calendar year wants S status from January 1, 2027. It can file Form 2553 any time in 2026 or up to March 15, 2027. If it files on April 1, 2027, the election takes effect on January 1, 2028 unless it asks for late-election relief.
Founders outside the US: because non-resident aliens cannot be shareholders, a company owned by a founder living abroad cannot be an S corp. See our LLC tax guide for Indian entrepreneurs for the structures that do work.
S Corp vs. LLC
Both protect owners from business debts and avoid the double tax of a C corp, but they suit different needs. Remember that an S corp is a tax status and an LLC is a legal entity, so an LLC can elect to be taxed as an S corp. The table compares an S corp with an LLC under its default tax treatment.
| S corp | LLC (default tax) | |
|---|---|---|
| What it is | A federal tax status | A legal entity formed under state law |
| Formation | Form a corporation or LLC, then file Form 2553 | File articles of organization with the state |
| Default tax | Not a default; must be elected | Disregarded entity (one owner) or partnership (two or more) |
| Owners | Up to 100 eligible shareholders; no non-resident aliens, partnerships or corporations | Any number and any type of member, unless the LLC elects S corp tax |
| Profit splits | Strictly by ownership percentage | Flexible, set by the operating agreement |
| Owner pay | Reasonable W-2 salary plus distributions | Draws or guaranteed payments; self-employment tax on active owners' profit |
| Best for | Profitable owner-operators who want to cut self-employment tax | Owners who want flexibility and simple administration |
For more on how an LLC is taxed by default, see our single-member LLC and multi-member LLC guides.
S Corp vs. C Corp
S corps and C corps are formed the same way under state law. The differences are in how they are taxed, who can own them and what kind of investment they can take.
| S corp | C corp | |
|---|---|---|
| Federal tax | Pass-through; no corporate income tax in most cases | 21% corporate tax, then tax on dividends |
| Owners | Up to 100 eligible shareholders, US citizens or residents | No limit on number or type, including foreign owners and funds |
| Stock | One class (voting differences allowed) | Multiple classes, including preferred stock |
| Losses | Pass through to shareholders, limited by basis | Stay in the company as net operating losses |
| Return | Form 1120-S plus a K-1 for each shareholder | Form 1120 |
| Best for | Privately held businesses that distribute profit | Companies raising venture capital or reinvesting most profit |
A C corp suits a growth company that plans to raise venture capital, issue preferred stock or have foreign investors. An S corp suits a small or mid-sized business that will stay privately held and wants to pay out profit without a second layer of tax. A company can start as an S corp and revoke the election later, but it then generally has to wait five years to elect again.
How to Form an S Corp
If your business meets the requirements, forming an S corp follows this sequence.
Step 1: Form a Corporation or LLC
- Choose a name that meets your state’s rules and is available.
- File articles of incorporation (or articles of organization for an LLC) with your state’s business filing office.
- Adopt bylaws or an operating agreement covering ownership, rights, meetings and decisions.
- For a corporation, appoint directors and officers and issue shares in line with each owner’s percentage.
Step 2: Get an EIN
Apply for an Employer Identification Number from the IRS. Form 2553 asks for it, so this comes before the election. A company that already has an EIN keeps it; electing S status does not require a new one.
Step 3: File Form 2553
Complete Form 2553, have every shareholder sign the consent, and file it within the deadline. Keep the IRS acceptance letter (CP261 notice) with your records.
Step 4: Set Up Payroll
Put working owners on payroll at a reasonable salary, with federal and state withholding, quarterly Form 941 filings and year-end W-2s.
Step 5: Meet Ongoing Requirements
- Hold annual shareholder and board meetings and keep minutes, if you are a corporation.
- Keep clean books and track each shareholder’s basis.
- File Form 1120-S and issue a Schedule K-1 to each shareholder every year.
- File any state S corp return and pay state taxes or fees.
S Corp Deadlines and Penalties
| Item | Due date or amount | Notes |
|---|---|---|
| Form 2553 (new election) | 2 months and 15 days after the tax year starts (March 15 for a calendar year), or any time in the prior year | Late relief possible under Rev. Proc. 2013-30 |
| Form 1120-S and K-1s | March 15 (calendar year) | September 15 with Form 7004 |
| Late-filing penalty | $260 per shareholder per month, up to 12 months | For returns due in 2027 |
Worked example: an S corp with three shareholders files its 2026 Form 1120-S two months late, without an extension. The penalty is $260 × 3 shareholders × 2 months = $1,560, even if the company owes no tax.
Need your S corp election and 1120-S handled?
Countsure files Form 2553, sets up owner payroll at a supportable salary, and prepares the 1120-S and shareholder K-1s each year.
Frequently Asked Questions
1. Is an S corp a type of company or a tax status?
A tax status. You form a corporation, or an eligible LLC, under state law and then elect with the IRS on Form 2553 to be taxed under Subchapter S. The S corp label describes how the entity is taxed, not how it is legally organized.
2. How does an S corp avoid double taxation?
An S corp generally pays no federal corporate income tax. Its profit and losses pass through to shareholders on Schedule K-1, and each shareholder pays tax on their share on their own return. Profit is taxed once, not at both the corporate and shareholder levels as in a C corporation.
3. Can an LLC be an S corp?
Yes. An LLC that meets the eligibility rules can elect S corporation tax by filing Form 2553. It stays an LLC under state law but is taxed as an S corporation federally.
4. Why do S corp owners have to take a salary?
Shareholders who work in the business must be paid a reasonable W-2 salary, with payroll taxes withheld, before taking distributions. Otherwise owners could take all profit as distributions and avoid payroll tax entirely. A salary that is too low is a common audit issue.
5. How many shareholders can an S corp have?
No more than 100. Members of one family can count as a single shareholder. Shareholders must be US citizens or residents, certain trusts and estates, or certain tax-exempt organizations, and the company can have only one class of stock.
6. Can a non-resident or a foreign company own an S corp?
No. A non-resident alien, a partnership or a corporation cannot be a shareholder. If an ineligible person acquires shares, the S election ends automatically and the company is taxed as a C corporation.
7. Which IRS form makes the S corp election, and when is it due?
Form 2553, signed by every shareholder. It must be filed no later than 2 months and 15 days after the start of the tax year the election should take effect (March 15 for a calendar-year company), or at any time in the prior year. A late election can often be fixed under Rev. Proc. 2013-30.
8. When is the S corp tax return due?
Form 1120-S is due March 15 for a calendar-year S corporation, with an automatic six-month extension to September 15 if Form 7004 is filed on time. Each shareholder must receive a Schedule K-1. Late filing for returns due in 2027 costs $260 per shareholder for each month late, up to 12 months.
9. Is an S corp worth it for a small business?
It usually starts to pay off once profit is comfortably above what a reasonable salary for the owner would be, because only the salary bears payroll tax. Below that point, the cost of payroll, a separate return and state fees can outweigh the savings.
10. Does an S corp need a new EIN?
No. An existing corporation or LLC keeps its EIN when it elects S corporation status. You need the EIN before filing Form 2553, because the form asks for it.
Thinking About an S Corp Election? Get the Structure Right from the Start.
An S corporation comes with eligibility rules, a reasonable-salary standard and yearly filings that are easy to get wrong and costly to fix. Countsure is a CPA-led firm that helps owners choose the right entity, make the election cleanly and stay compliant year after year.
Other Related Services
- What Is an LLC?: types, taxes and how a limited liability company works.
- Single-Member LLC Guide: how a one-owner LLC is taxed and when an S election helps.
- Multi-Member LLC Guide: partnership tax, Form 1065 and K-1s.
Parth Shah, Managing Director
(CPA-US, FCA, RV-S&FA, DISA)
Parth Shah who is head of Accounts and Book keeping has experience of more than 10 years. A Certified Public Accountant – US, fellow Chartered Accountant, Registered Valuer and Diploma in Information System Audit.
