What Is an S Corp? A Plain-English Guide to the Tax Election
Most people searching for an S corp are looking for a kind of company to start. That is the most common misunderstanding about this topic, and it is worth clearing up first: an S corp is not a business structure. It is a tax election you apply for after you have a company.
This guide covers what an S corp actually is, where the name comes from, how taxation and distributions work, who qualifies, what it costs, and the state-level catch that trips up owners who assume federal approval settles it.
Key Takeaways
- An S corp is a federal tax election, not a type of business entity.
- The entity comes first: you form an LLC or corporation before filing anything with the IRS.
- Profits and losses pass through to shareholders, who split income between a reasonable salary and distributions.
- Eligibility is strict: 100 shareholders or fewer, one class of stock, and only individuals, certain trusts or estates as owners.
- Federal approval does not automatically mean your state recognizes the election.
What Is an S Corp?
An S corp is a federal tax election, not a business structure. You form an LLC or a corporation with your state first, then ask the IRS to tax it under Subchapter S by filing Form 2553. The company itself pays no federal income tax on most profits. Shareholders report the income on their personal returns.
That sequence matters more than any other detail here. No form creates an S corp out of nothing. You form an LLC or a corporation first, and the election is a layer of tax treatment applied on top. Your legal structure does not change: if you had an LLC on Monday and the IRS accepts your election on Friday, you still have an LLC. The IRS defines an S corporation as a corporation that elects to pass income, losses, deductions and credits through to its shareholders.
This is also why "S corp or LLC" is not really an either/or. An LLC can elect the treatment and remain an LLC, the route most small business owners take. Our S corp vs LLC comparison handles that decision in full.
What Does S Corp Stand For?
The S stands for Subchapter S of the Internal Revenue Code, the section that sets the rules for this tax treatment. The full term is S corporation, also written S-corporation. The alternative is Subchapter C, which taxes profits at the company level and again when shareholders receive dividends.
That second layer is what the election avoids. A C corporation pays tax on its profits, then shareholders pay again on dividends. An S corp skips the company-level layer.
How S Corp Taxation Actually Works
The company files Form 1120-S each year and issues a Schedule K-1 to every shareholder showing their share of income, deductions and credits. Shareholders carry those figures onto their personal tax returns and pay at their own rates. The business generally owes no federal income tax itself.
"Generally" is doing real work there. Most explainers say the company pays no federal income tax, full stop. The IRS is more precise: an S corp still owes tax on certain built-in gains and passive income at the entity level. For most small operating businesses that never comes up, but the bill is not automatically zero.
The part owners care about is the split. If you work in your own business, the IRS expects a reasonable salary before you take anything else out. That salary runs through S corp payroll like any other employee's wages, which means Social Security and Medicare taxes at a combined 15.3 percent. Profit beyond that salary comes out as a distribution, free of those payroll taxes. On a sole proprietorship or a default LLC, the whole profit is exposed to self-employment tax.
That gap is the financial case for the election. What counts as "reasonable" is a judgment call with real audit consequences, and our S corp tax calculator walks through the math. The annual return, including deadlines and extensions, is covered in our guide to S corp filing.
S Corp Distributions and How They Are Taxed
S corp distributions are the profits you take out beyond your salary. They are the reason most owners look at this election, and the piece most guides get wrong.
How Are S Corp Distributions Taxed?
S corp distributions are not taxed again when you take them, but only up to your stock basis. Above basis, the excess is taxed as a capital gain. The underlying profit was already taxed on your Schedule K-1, whether or not you actually withdrew the money that year.
Stock basis is roughly what you put in, plus income already taxed to you, minus what you have taken out. Plenty of articles stop at "distributions are not taxed", true only inside that limit. Beyond it the excess becomes a capital gain, tracked on Form 7203. The IRS guidance on S corporation stock and debt basis sets out the calculation.
So there is no single S corp distribution tax rate to quote. Inside basis the payment is not a taxable event, because the profit behind it was already taxed on your K-1. Outside basis, capital gains rates apply.
The S corp shareholder distribution rules are stricter than most owners expect. Profits have to be allocated strictly by ownership percentage. Two owners with equal shares take equal distributions, even if one did most of the work. An LLC taxed as a partnership can split profits flexibly. This structure cannot.
Who Qualifies to Be an S Corp
The IRS sets five tests. It requires a domestic entity, no more than 100 shareholders, one class of stock, and a company that is not an ineligible corporation. Shareholders can only be individuals, certain trusts or estates. Partnerships, corporations and non-resident aliens cannot hold S corp stock.
Differences in voting rights are allowed. Differences in distribution or liquidation rights are not: those create a second class of stock and end the election. Certain financial institutions, insurance companies and domestic international sales corporations are excluded.
Who Can Own Shares in an S Corp?
Ownership is where the real questions land:
| Eligible Shareholders | Not Eligible |
|---|---|
| US citizens and residents | Partnerships |
| Certain trusts and estates | Corporations |
| Single-member disregarded LLCs | Multi-member LLCs |
| Non-resident aliens |
Can an S corp own an LLC? Yes. Nothing stops it from being a member of an LLC, and holding subsidiaries this way is common.
Can an LLC own an S corp? Generally no, with one exception that matters. A multi-member LLC is treated as a partnership, and partnerships cannot hold the stock. But a single-member LLC that is a disregarded entity, owned by an eligible individual, can hold shares, because the IRS looks through to the person behind it. Most sources state a flat "no" and leave owners thinking a workable structure is off limits.
Can a partnership own an S corp? No. The IRS names partnerships explicitly as ineligible, and a single ineligible owner voids the election for everyone.
For the most common route, our guide to an LLC with an S corp election covers how that structure works. And eligibility is not a one-time check: adding an ineligible shareholder later, or accidentally creating a second class of stock, can terminate the election.
The Benefits of an S Corp, and What They Cost
The benefits of an S corp come down to three things. The first is the payroll tax saving on distributions described above. The second is pass-through treatment, which keeps most profit from being taxed at the company level and again at the shareholder level. The third is the qualified business income deduction under Section 199A, worth up to 20 percent of qualifying profit, with one catch: the IRS does not count reasonable compensation from the company as QBI. The salary you are required to pay yourself is the one slice that does not qualify.
The costs are real and recurring: payroll administration, a separate Form 1120-S each year, tighter recordkeeping, and a reasonable salary requirement that draws IRS attention when owners under-pay themselves.
So where is the break-even? Published guidance ranges from roughly $40,000 to $80,000 in annual net profit, a spread of more than a factor of two. That is not imprecision. The break-even moves with your reasonable salary, your state, and what payroll and a preparer cost you. A CPA can run your actual numbers, worth more than any published threshold.
The State Layer Most Guides Skip
Electing S corp status with the IRS is a federal action. It does not automatically bind your state, and this is where owners get caught.
California recognizes the federal election but still taxes S corporation income from California sources at 1.5 percent, and every corporation incorporated, registered or doing business in the state owes an $800 minimum franchise tax, payable whether the business is active, inactive or running at a loss. One break most guides miss: the Franchise Tax Board waives that $800 minimum for a newly formed S corporation filing its initial return for its first taxable year. First-year net income is still subject to the 1.5 percent rate.
New York requires a separate state election, so federal acceptance does not carry over on its own. New Jersey has changed its procedure as well. Some states do not recognize the status at all and tax the company as a regular corporation.
So check your state before assuming the election delivers the saving you calculated.
How to Become an S Corp and What It Costs
You form an LLC or corporation with your state, then file Form 2553 with the IRS, signed by every shareholder. Form 2553 itself is free. The real cost is the state filing fee for the underlying entity, which runs from $35 to $500 across the states, with a median of $100.
You need an EIN before the election can be processed, so start with our EIN application guide if you do not have one. Deadlines, late-election relief and what the IRS sends back are covered in our guide to the S corp election, along with Form 2553.
How much does it cost to start an S corp, all in? The filing side is cheap. The recurring side, payroll processing and a preparer for the annual 1120-S, decides whether the election pays for itself. Those are the numbers to weigh against the payroll tax saving.
Ready to form the entity the election sits on? FormationHub files your LLC with your state, so the structure is in place before you take the tax question to your accountant.
Disclaimer: FormationHub is not a law firm or an accounting firm, and this article is general information, not legal or tax advice. Filing fees, processing times, and state requirements change. Confirm the current requirements with your state's filing office or the IRS before you file, and talk to a licensed attorney or CPA about your specific situation.
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