If you run a profitable small business, you have probably heard someone say you should “become an S corp” to save on taxes. But what is an S corp, exactly, and is it right for you? An S corp is not a separate type of company you register with your state. It is a federal tax status that an eligible corporation or LLC chooses by filing a form with the IRS. That choice changes how the business and its owners are taxed, and it can cut self-employment taxes once profits are high enough.
This guide explains what an S corp is in plain English, who qualifies, how the taxes work with a worked example, the pros and cons, how it compares with an LLC and a C corp, and the exact steps to elect S corp status.
What Is an S Corp?
An S corp (short for S corporation) is a business that has elected to be taxed under Subchapter S of Chapter 1 of the Internal Revenue Code. The name comes from that subchapter. A regular corporation that has not made this election is called a C corporation, taxed under Subchapter C.
The key feature of an S corp is that it is a pass-through entity. The business itself generally does not pay federal income tax. Instead, its profit, losses, deductions and credits “pass through” to the owners, who report their share on their personal tax returns. That avoids the double taxation C corporations face, where profit is taxed once at the corporate level and again when it is paid out as dividends.
Two kinds of businesses can become an S corp:
- A corporation formed under state law can elect S corp status.
- An LLC can elect to be taxed as a corporation and then as an S corp. Its legal structure stays an LLC; only the tax treatment changes.
Who Qualifies? S Corp Eligibility Requirements
The IRS sets strict rules for who can elect S corp status. To qualify, the business must:
- Be a domestic corporation, or an LLC eligible to be taxed as a corporation.
- Have no more than 100 shareholders. Family members can be counted as one shareholder.
- Have only allowed shareholders: individuals, certain trusts and estates. Partnerships, corporations and nonresident aliens cannot own shares in an S corp.
- Have only one class of stock. Differences in voting rights are allowed, but every share must have the same rights to profits and distributions.
- Not be an ineligible business, such as certain banks, insurance companies or domestic international sales corporations.
- Get written consent from every shareholder to the election.
If the business later breaks one of these rules, for example by adding a foreign shareholder, the S corp election ends automatically.
How S Corp Taxes Work
Understanding how an S corp is taxed comes down to three ideas: pass-through income, owner salary and distributions.
Pass-Through Income
The S corp files an informational return, Form 1120-S, each year. It then issues a Schedule K-1 to each shareholder showing their share of income, deductions and credits. Shareholders report those amounts on their own Form 1040 and pay income tax at their personal rates, whether or not the money was actually paid out to them.
Reasonable Salary for Owners
This is where the tax savings come from, and where most mistakes happen. If you own an S corp and work in the business, the IRS expects you to pay yourself a reasonable salary through payroll. That salary is subject to Social Security and Medicare taxes (FICA), just like any employee’s wages, and the business withholds income tax from it.
“Reasonable” means roughly what you would pay someone else to do the same job in the same industry and area. Setting your salary too low to dodge payroll taxes is a common audit trigger, and the IRS can reclassify distributions as wages.
Distributions
Profit left after paying your salary can be taken as distributions. Distributions are still subject to income tax, but they are not subject to the 15.3% self-employment or FICA tax. That difference is the main S corp tax advantage.
The QBI Deduction
S corp owners may also qualify for the Section 199A qualified business income (QBI) deduction of up to 20% of qualified business income. The deduction was set to expire after 2025, but the 2025 tax law known as the One Big Beautiful Bill Act made it permanent, as explained by RSM’s analysis of the change. Owner wages paid by the S corp do not count as QBI, so salary levels affect this deduction too.
S Corp Tax Savings Example
Here is a simplified example comparing a single-member LLC taxed as a sole proprietorship with the same business taxed as an S corp. It ignores state taxes, retirement contributions and the QBI deduction to keep the math clear.
| Default LLC (sole proprietor) | LLC taxed as an S corp | |
|---|---|---|
| Net business profit | $100,000 | $100,000 |
| Owner salary through payroll | Not applicable | $60,000 |
| Distributions | Not applicable | $40,000 |
| Self-employment or FICA tax | About $14,130 (15.3% on 92.35% of profit) | About $9,180 (15.3% on $60,000 salary) |
| Estimated payroll tax saving | About $4,950 |
That saving is before the extra costs of running an S corp: payroll software or a payroll service, a separate business tax return, and often higher accounting fees. Those costs commonly run $1,500 to $3,000 a year or more, so the real benefit in this example is closer to $2,000 to $3,500.
Pros and Cons of an S Corp
Advantages
- Lower self-employment taxes on profit above a reasonable salary.
- No double taxation at the federal level, unlike a C corp.
- Pass-through losses can offset other income, subject to basis and at-risk limits.
- Credibility with some banks, clients and partners that prefer working with corporations.
- Easy ownership transfer of shares compared with partnership interests.
Disadvantages
- More paperwork and cost: payroll, quarterly payroll filings, Form 1120-S and K-1s.
- Strict eligibility rules on shareholders and stock classes.
- Reasonable salary scrutiny from the IRS.
- Less flexible profit splits: distributions must follow ownership percentages. An LLC taxed as a partnership can split profits in other ways.
- Taxable fringe benefits: owners with more than 2% of the shares pay tax on many benefits, such as health insurance premiums, that would be tax-free for regular employees.
- State differences: some places do not fully follow the federal S corp rules. New York City and Washington, D.C., for example, tax S corps much like regular corporations, and California charges a 1.5% franchise tax on S corp income with an $800 minimum.
S Corp vs LLC vs C Corp
Because an S corp is a tax status rather than a legal entity, the real comparison is between how each option is taxed.
| Feature | LLC (default tax) | S corp | C corp |
|---|---|---|---|
| Legal protection for owners | Yes | Yes | Yes |
| Federal tax at business level | No | No (in most cases) | Yes, 21% flat rate |
| Self-employment tax on all profit | Yes | No, only on salary | No, but dividends are taxed twice |
| Ownership limits | None | Up to 100 eligible shareholders | None |
| Classes of stock | Flexible | One | Multiple |
| Paperwork | Lowest | Moderate | Highest |
| Best for | New or low-profit businesses | Profitable owner-operated businesses | Companies raising venture capital or reinvesting profit |
When Does an S Corp Make Sense?
There is no single profit level where electing S corp status becomes worthwhile, but many accountants start the conversation when a business consistently earns around $40,000 to $60,000 or more in net profit after a reasonable owner salary is possible. Below that, the savings are often eaten up by payroll and accounting costs.
An S corp usually makes sense when:
- Profit is steady and well above what you would pay yourself as a reasonable salary.
- You are comfortable running payroll and keeping clean books.
- All owners are U.S. citizens or residents, and you do not plan to bring in corporate or foreign investors.
It usually does not make sense when profits are low or unpredictable, when you plan to raise venture capital, or when owners want to split profits differently from their ownership percentages.
How to Set a Reasonable Salary
There is no fixed formula, but the IRS looks at the facts that would decide pay for any employee. Before you pick a number, gather evidence for it:
- Your duties and hours. List what you actually do each week: sales, delivery, management, bookkeeping. A full-time owner who does the core work of the business should earn more than someone who checks in occasionally.
- Market pay for the role. Look up wages for similar jobs in your area using the Bureau of Labor Statistics occupational wage data, salary surveys or job listings.
- Your training and experience. A licensed professional such as an engineer or nurse practitioner should be paid in line with that license.
- What the business can afford. Salary should not exceed what the company earns, but it also should not be set at a token amount while large distributions are paid out.
- Prior years. Pay that jumps up and down without a business reason invites questions.
Keep a short memo in your records explaining how you chose the figure. If the IRS ever asks, a written rationale backed by market data is far stronger than a number picked to minimize tax. Review it every year as the business grows.
Three Real-World Scenarios
A freelance designer earning $35,000 a year. After payroll costs and a separate tax return, the savings would be small or even negative. Staying a default LLC is usually the better choice until profit grows.
A consultant earning $150,000 a year. If similar consultants are paid about $90,000, the remaining $60,000 can be taken as distributions free of payroll tax. The yearly saving can be meaningful even after accounting fees, which is why this owner is a classic candidate.
Two friends running a restaurant who plan to bring in an outside investor company. Corporate shareholders are not allowed, so the election would end as soon as the investor joins. A partnership-taxed LLC or a C corporation may fit their plans better.
How to Elect S Corp Status: Step by Step
- Form a corporation or LLC in your state if you have not already.
- Get an Employer Identification Number (EIN) from the IRS.
- Confirm every shareholder is eligible and that you have only one class of stock.
- File IRS Form 2553 with signatures from every shareholder.
- Set up payroll and pay yourself a reasonable salary.
- Check your state’s rules, since some states require a separate election or charge extra taxes.
- File Form 1120-S each year and issue K-1s to shareholders.
Form 2553 Deadline
Form 2553 must be filed no later than two months and 15 days after the start of the tax year in which you want S corp status to begin. For a calendar-year business, that is generally March 15. According to Bench’s guide to Form 2553, a late election normally takes effect the following year, although the IRS can grant late-election relief under Revenue Procedure 2013-30 if you had reasonable cause and acted consistently with S corp status.
Common S Corp Mistakes to Avoid
- Paying no salary or an unreasonably low one. This is the most common S corp red flag.
- Mixing personal and business money. Keep separate bank accounts and pay yourself properly.
- Forgetting basis limits. You can only deduct losses up to your stock and debt basis in the S corp.
- Taking unequal distributions. Paying one owner more than their ownership share can look like a second class of stock and risk the election.
- Missing state filings. Federal approval does not automatically cover state taxes.
What Is an S Corp? Frequently Asked Questions
Is an S corp the same as an LLC?
No. An LLC is a legal entity created under state law. An S corp is a federal tax election. An LLC can choose to be taxed as an S corp while staying an LLC legally.
How does an S corp owner get paid?
Through a combination of a reasonable salary paid via payroll and distributions of remaining profit. Salary is subject to payroll taxes; distributions are not.
Can a single person own an S corp?
Yes. An S corp can have one shareholder, as long as that person is an eligible shareholder such as a U.S. citizen or resident.
Does an S corp pay taxes?
At the federal level, an S corp generally does not pay income tax itself. Its income passes through to the owners. There are exceptions, such as the built-in gains tax for some businesses that converted from C corps, and many states charge their own fees or taxes.
Can I switch back from an S corp?
Yes. You can revoke the election with consent from shareholders holding more than half of the shares. In most cases, you then have to wait five years before electing S corp status again.
The Bottom Line
So, what is an S corp? It is a tax election that lets a corporation or LLC pass profits through to its owners while paying payroll taxes only on a reasonable salary. For a profitable, owner-run business, an S corp can save thousands of dollars a year. For a new or low-profit business, the extra paperwork usually outweighs the benefit. Run the numbers with a tax professional before you file Form 2553.
Want more practical money guides? Explore the Evora Finance section for more articles on taxes, business and personal finance.
This article is for general information and is not tax, legal or financial advice. Tax rules change and depend on your situation, so consult a qualified CPA or tax attorney before making an S corp election.
