A corporation is formed under state law. "S-corp" and "C-corp" are not different kinds of corporations — they are two different federal tax elections that the same state-law corporation (or, in some cases, an LLC) can make. A C-corp is the default: the business pays corporate income tax on its profits, and shareholders pay tax again on dividends. An S-corp is a pass-through election: profits and losses flow through to the owners' personal tax returns, and the business itself generally doesn't pay federal income tax — but only if the company meets strict ownership limits. Here's how the two actually work, and how to think about which one fits your situation.
Step one: the corporation itself is a state-law creature
When you incorporate, you file paperwork with a state agency — usually the Secretary of State — and that state's law governs your corporation's existence, its board and shareholder rules, and its annual reporting duties. Formation fees, ongoing report requirements, and any state franchise tax vary by state and change over time, so don't rely on a number you saw somewhere else — check your state's Secretary of State and state tax agency for the current figures before you file.
Once that corporation exists, it has a separate question to answer: how will it be taxed for federal purposes? By default, a newly formed corporation is taxed as a C-corporation. It can instead elect to be taxed as an S-corporation by filing Form 2553 with the IRS, if it qualifies. That election doesn't change anything about how the corporation was formed under state law — it only changes how the IRS taxes it.
C-corp: the default, and "double taxation"
A C-corporation is its own separate taxpayer. It calculates its taxable income and pays federal corporate income tax on it at a flat rate (21% federal, current as of this writing under permanent law — always confirm the current rate on irs.gov before you rely on it, since tax law can change). If the corporation then distributes profits to shareholders as dividends, those shareholders pay tax again on that dividend income on their personal returns. That two-layer result is what people mean by "double taxation."
Double taxation sounds purely negative, but it comes with real advantages that matter to certain businesses:
No ownership restrictions. A C-corp can have unlimited shareholders, including other corporations, LLCs, partnerships, trusts, and foreign investors.
Multiple classes of stock. You can create common stock, preferred stock, and different voting rights — which is exactly what venture capital and other outside investors typically require.
Retained earnings flexibility. Profits can be kept in the company and reinvested without immediately passing tax liability through to owners' personal returns.
Familiar structure for institutional investors. Most VC funds and many banks are set up to invest in C-corps, not S-corps or LLCs.
This is why most companies that plan to raise venture capital, go public, or bring in a large and varied group of investors are C-corps: the S-corp restrictions below would make that kind of capital-raising impossible.
S-corp: pass-through taxation, with limits
An S-corporation is not a separate taxpayer in the same way. Instead, its income, losses, deductions, and credits generally "pass through" to the shareholders, who report their share on their own personal tax returns — similar to how a partnership or a sole proprietorship is taxed. This avoids the second layer of tax that hits C-corp dividends. Many owner-operated small businesses that don't need outside institutional investors choose the S-corp election for this reason, since the QBI/Section 199A deduction can also let eligible pass-through business income qualify for a deduction of up to 20% — confirm your eligibility and the current rules on irs.gov, since the calculation has real limits and phase-outs.
To be eligible for S-corp status, the IRS requires the corporation to meet several ownership limits at all times:
No more than 100 shareholders. Certain family members can be counted as a single shareholder for this test.
Shareholders must be eligible owners. Generally individuals who are U.S. citizens or resident aliens, along with certain trusts and estates. Other corporations, partnerships, and nonresident aliens generally cannot be shareholders.
Only one class of stock. All shares must carry identical rights to distributions and liquidation proceeds (differences in voting rights alone are allowed).
Must be a domestic (U.S.) corporation that isn't an ineligible type of corporation (certain financial institutions and insurance companies, for example, can't elect S status).
If a company later violates any of these — say, a shareholder transfers stock to a corporation, or the company issues a second class of stock — the S-election can terminate, sometimes unexpectedly, and the company reverts to C-corp taxation. That's a real risk worth watching if your ownership structure is changing (a new investor, a divorce transferring shares, an estate).
Can an LLC be an S-corp?
Yes, and this is one of the most common points of confusion. An LLC has no federal tax classification of its own. By default, a single-member LLC is taxed as a disregarded entity (reported on the owner's personal Schedule C), and a multi-member LLC is taxed as a partnership. But an LLC can elect to be taxed as a C-corporation, or — if it meets the same ownership limits described above — elect S-corp tax treatment, all while remaining an LLC under state law. Forming an LLC changes your personal liability protection; it does not, by itself, change how you're taxed. The tax classification is a separate, later choice. For the mechanics of making that specific choice, see our guide to the S-corp election.
What to do: steps if you're weighing this choice
Get the entity formed first. File your formation documents (articles of incorporation, or articles of organization for an LLC) with your state. State filing requirements and fees vary — confirm current details with your Secretary of State.
Decide whether outside investors are realistically in your future. If you plan to raise venture capital or bring in a wide, varied group of investors, C-corp taxation (and often Delaware incorporation, which is its own separate question) is usually the path institutional investors expect.
If you want pass-through treatment, confirm you meet every S-corp eligibility requirement — ownership count, shareholder eligibility, one class of stock — before you file.
File Form 2553 with the IRS if electing S-status. There is a filing deadline tied to your tax year and formation date. That deadline, and the relief available if you miss it, are detailed in the Form 2553 instructions — the exact date depends on your situation, so confirm it directly with the current IRS instructions rather than relying on a general rule of thumb.
Talk to a CPA before you file. Payroll requirements differ too: S-corp owners who work in the business are generally required to pay themselves a reasonable salary through payroll (subject to payroll withholding) in addition to any pass-through distributions, and getting that wrong has real consequences. A qualified accountant can model out the numbers for your specific situation.
A quick way to keep it straight
Think of it as two separate questions with two separate answers:
"What kind of legal entity is this?" — Answered by state law: corporation, LLC, partnership, sole proprietorship.
"How does the federal government tax it?" — Answered by a federal election: as a C-corp (default for corporations), as an S-corp (if eligible and elected), or, for an LLC, as disregarded, partnership, S-corp, or C-corp.
Neither an S-corp nor a C-corp status changes your state-law liability protection — that comes from properly forming and maintaining the corporation or LLC itself, keeping business and personal funds separate, and following your state's corporate formalities. If your business is carrying debt or you're worried about a creditor or a possible bankruptcy filing, that's a separate question from your tax election, and it's worth talking to an attorney about the business-debt side specifically.
Frequently asked questions
Is an S-corp always better than a C-corp for a small business?
Not always — it depends on your goals. S-corp pass-through taxation avoids the second layer of dividend tax and suits many owner-operated businesses, but the ownership limits can be a real constraint. A C-corp is usually the right call if you plan to raise venture capital, want multiple classes of stock, or expect a large and varied ownership group.
Can I switch from a C-corp to an S-corp later, or vice versa?
Generally yes, though each direction has its own rules, timing requirements, and potential tax consequences (switching from C to S can trigger a built-in-gains tax on appreciated assets in some cases). This is a conversation to have with a CPA before you file anything.
Does forming an LLC automatically give me S-corp tax treatment?
No. An LLC's default federal tax treatment is disregarded (single-member) or partnership (multi-member). S-corp taxation for an LLC requires a separate, affirmative election with the IRS, and the LLC must meet the same ownership eligibility rules as a corporation to qualify.
Do S-corp owners avoid self-employment tax entirely?
No. An S-corp owner who works in the business must be paid a reasonable salary through payroll, and that salary is subject to standard payroll taxes just like any employee's wages. Only the additional pass-through distribution portion (beyond reasonable salary) avoids self-employment tax — and the IRS actively scrutinizes unreasonably low salaries set up to dodge payroll tax.
Does my state also recognize the S-corp election?
It varies. Most states follow the federal S-corp election automatically, but some require a separate state-level election or tax S-corps differently (including a few that tax them like C-corps at the state level). Check with your state's tax agency.
This article is general business and tax information, not legal, tax, or financial advice, and using it doesn't create an attorney-client or accountant-client relationship. For a decision specific to your business, talk to a qualified attorney or CPA, or contact your local SBA office or Small Business Development Center for free guidance.
Frequently asked questions
Is an S-corp always better than a C-corp for a small business?
Not always — it depends on your goals. S-corp pass-through taxation avoids the second layer of dividend tax and suits many owner-operated businesses, but the ownership limits can be a real constraint. A C-corp is usually the right call if you plan to raise venture capital, want multiple classes of stock, or expect a large and varied ownership group.
Can I switch from a C-corp to an S-corp later, or vice versa?
Generally yes, though each direction has its own rules, timing requirements, and potential tax consequences (switching from C to S can trigger a built-in-gains tax on appreciated assets in some cases). Talk to a CPA before you file anything.
Does forming an LLC automatically give me S-corp tax treatment?
No. An LLC's default federal tax treatment is disregarded (single-member) or partnership (multi-member). S-corp taxation for an LLC requires a separate, affirmative election with the IRS, and the LLC must meet the same ownership eligibility rules as a corporation to qualify.
Do S-corp owners avoid self-employment tax entirely?
No. An S-corp owner who works in the business must be paid a reasonable salary through payroll, subject to standard payroll taxes. Only additional pass-through distributions beyond reasonable salary avoid self-employment tax, and the IRS scrutinizes unreasonably low salaries set up to dodge payroll tax.
Does my state also recognize the S-corp election?
It varies. Most states follow the federal S-corp election automatically, but some require a separate state-level election or tax S-corps differently. Check with your state's tax agency.
This article is general legal information, not legal advice, and may not reflect the most current law or the law in your jurisdiction. Laws vary by state and change over time. For advice about your specific situation, consult a licensed attorney.
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