C Corp Meaning: How a C Corporation Is Taxed, When It Makes Sense and How It Compares with an S Corp or LLC

If someone told you to "form a C corp" because investors expect it, or you've heard C corps get "double taxed," this guide explains what that means for your money. It's for US founders and small business owners deciding on an entity, or reconsidering one. You'll get the plain-English C corp meaning, the 21% federal rate, a worked example of double taxation in dollars, the July 2025 changes to the qualified small business stock (QSBS) exclusion, a side-by-side with S corps and LLCs, state franchise taxes, and a practical test for when a C corp really makes sense.

Quick answer

A C corp is a corporation taxed under Subchapter C of the tax code. It's a separate legal entity that pays its own federal income tax at a flat 21% on Form 1120. When it pays dividends, shareholders are taxed again. That's the double taxation people mean.

• Owners (shareholders) have limited liability; a board of directors runs the company

• No limit on the number or type of shareholders, and multiple classes of stock are allowed

• Profits kept in the business are taxed only at 21%

• Only C corp stock can qualify for the Section 1202 QSBS gain exclusion, now up to $15 million per issuer

• Best fit: venture-backed startups, companies reinvesting profits, foreign or many owners

What a C corp is

"C corp" isn't a separate kind of business you register with a state. You form a corporation by filing articles (or a certificate) of incorporation with a Secretary of State. The "C" describes how the IRS taxes it. Every corporation is a C corporation by default, taxed under Subchapter C of Chapter 1 of the Internal Revenue Code, unless its shareholders elect S corporation status by filing Form 2553.

Legally, a corporation is a person separate from its owners. It can sign contracts, own property, borrow, sue and be sued in its own name. The SBA describes corporations as offering the strongest protection to their owners from personal liability, at the cost of more formation expense, record-keeping and reporting than other structures. Shareholders own the company through stock. They elect a board of directors, which sets policy and appoints officers, such as a CEO, treasurer and secretary, to run daily operations. In a one-founder corporation, the same person can hold every role, but the roles still exist on paper and the corporation is expected to keep bylaws, hold or document annual shareholder and board decisions, and keep a stock ledger.

That separation is what creates both the liability shield and the tax result. Because the corporation is its own taxpayer, its profits are taxed on its own return, not on yours. You only owe personal tax when money moves from the corporation to you, as salary, bonus, dividends or proceeds when you sell your shares.

How a C corp is taxed

At the corporate level, a C corp files Form 1120 and pays a flat 21% federal rate on taxable income. That rate has applied since 2018 and has no expiry date, so it wasn't part of the 2025 tax-law extensions. For a calendar-year corporation, Form 1120 is due by the 15th day of the fourth month after year-end, which is April 15. Corporations with a June 30 fiscal year-end file by September 15. Form 7004 gives an automatic extension to file, but not to pay. Corporations that expect to owe $500 or more for the year generally make quarterly estimated payments.

At the shareholder level, money you take out is taxed according to what it is:

• Salary and bonuses for work you do as an employee are deductible by the corporation and taxed to you as wages, with payroll taxes of 7.65% on your side and a matching share paid by the corporation. Salary is taxed only once for income tax purposes.
• Dividends are paid from after-tax profit and are not deductible. Qualified dividends are taxed at 0%, 15% or 20%. For 2026, the 0% rate applies to taxable income up to $98,900 for married couples filing jointly ($49,450 for single filers), and 20% applies above $613,700 joint ($545,500 single). On top of that, the 3.8% net investment income tax applies to dividends once modified adjusted gross income passes $250,000 for joint filers or $200,000 for single filers.
• Selling your shares produces capital gain or loss, which may be partly or fully tax-free if the stock is QSBS (see below).

Two corporate-only taxes are worth knowing about. The accumulated earnings tax adds a 20% penalty tax on profits a corporation hoards beyond its reasonable business needs to help shareholders avoid dividend tax. Documented plans for expansion, equipment or working capital are the usual defence. The personal holding company tax hits corporations that mostly earn passive income such as rents, royalties or interest. Separately, the corporate alternative minimum tax applies only to very large groups with over $1 billion of average financial statement income, so it won't affect a small business.

Double taxation: a worked example

Here's what double taxation looks like for a profitable small C corp that pays out everything. Assume $200,000 of taxable profit after paying the owner a reasonable salary, a married owner filing jointly, and federal tax only.

$200,000 of C corp profit, fully paid out (federal only)

$42,000

Corporate tax

21% on Form 1120

$158,000

Paid as dividends

after-tax profit

$23,700

Dividend tax at 15%

owner in the 15% band

32.85%

Combined federal rate

$65,700 total tax

The corporation pays $42,000 and distributes the remaining $158,000. If the owner's income keeps them in the 15% qualified-dividend band, they pay $23,700. Total federal tax: $65,700, or 32.85% of the profit.

Now assume the owner is a high earner: the dividend lands in the 20% band and the 3.8% NIIT applies. Dividend tax becomes 23.8% × $158,000 = $37,604, and the combined federal rate reaches about 39.8%.

Compare that with a pass-through. If the same $200,000 flows through an S corp or LLC, it's taxed once on the owner's return at ordinary rates, which top out at 37%. Many owners of pass-through businesses also get the 20% qualified business income deduction, which can cut the top effective rate on that income to about 29.6%. For a business that distributes its profits, the pass-through usually wins.

The math flips when profits stay in the business. If the corporation retains the $158,000 to buy equipment, hire or build inventory, only the 21% has been paid. The second layer is deferred, possibly for years, and may never arrive if the shares later qualify for the QSBS exclusion. That's the core reason growth companies choose C corps.

Owners shrink double taxation in three legitimate ways: paying themselves reasonable salaries that the corporation deducts, providing deductible fringe benefits such as health coverage and retirement contributions, and retaining profits for real business needs. "Reasonable" matters: the IRS can recharacterize an inflated salary as a disguised dividend and disallow the deduction.

The pass-through side — self-employment tax on $200,000 of LLC profit

Net Self-Employment Earnings

Taxable Base (92.35%)$184,700.00

Social Security (12.4%)$22,878.00

Medicare (2.9%)$5,356.30

Deductible Half$14,117.15

Self-Employment Tax$28,234.30

Open the full Federal Tax Calculator (PDF, save, compare)

QSBS and Section 1202: what changed in July 2025

The qualified small business stock exclusion is the biggest tax reason founders and investors insist on a C corp. Under Section 1202, a non-corporate shareholder who acquires stock at original issue from a qualifying domestic C corporation, and holds it long enough, can exclude some or all of the gain when selling it. S corp and LLC interests don't qualify.

The One Big Beautiful Bill Act (Public Law 119-21), signed July 4, 2025, made three changes for stock issued and acquired after that date:

• Tiered holding periods. Previously, you got nothing unless you held the stock for more than five years. Now you can exclude 50% of the gain after three years, 75% after four and 100% after five.
• Higher cap. The per-issuer limit on excludable gain rose from $10 million to $15 million, or 10 times your basis in the stock if that's greater. The $15 million figure is indexed for inflation for tax years beginning after 2026.
• Bigger companies qualify. The corporation's aggregate gross assets can't exceed $75 million (up from $50 million) before and immediately after the stock is issued. This figure is also indexed after 2026.

Stock issued on or before July 4, 2025 keeps the old rules, including the $10 million cap and, for stock acquired after September 27, 2010, a 100% exclusion only after more than five years.

Some businesses never qualify. Section 1202(e)(3) excludes service businesses in health, law, engineering, architecture, accounting, actuarial science, performing arts, consulting, athletics, financial services and brokerage, as well as any business whose main asset is the reputation or skill of its employees. It also excludes banking, insurance, financing, leasing and investing, farming, mining and extraction, and hotels, motels and restaurants. The corporation must also use at least 80% of its assets in an active qualified business during substantially all of your holding period.

Example. A founder buys 1,000,000 shares of a new software C corp in January 2026 for $10,000. In 2031, after five years, she sells them for $12,010,000. Her $12 million gain is under the $15 million cap, so all of it can be excluded from federal income tax. Had she sold after three years, half the gain would be excluded and the taxable half would be taxed at up to 28%, the maximum rate that applies to Section 1202 gain, plus the NIIT if it applies. States don't all follow Section 1202. California, for example, doesn't, so check your state.

C corp vs S corp vs LLC

The three structures all give owners limited liability. The difference is mostly tax, ownership flexibility and paperwork.

C corp vs S corp vs LLC at a glance (2026)

	C corp	S corp	LLC (default tax)
Federal income tax	Corporation pays 21%; dividends taxed again	Pass-through; no entity-level federal tax	Pass-through; no entity-level federal tax
Tax return	Form 1120	Form 1120-S + K-1s	Schedule C (one owner) or Form 1065 + K-1s
Owners	Unlimited; anyone, including foreign persons and companies	Up to 100; US individuals and certain trusts/estates only	Unlimited; anyone
Classes of ownership	Multiple classes of stock (e.g. preferred)	One class of stock	Flexible allocations by agreement
Owner pay	Salary; dividends	Reasonable salary + distributions	Draws; profit subject to SE tax
Losses	Stay in the corporation	Pass to owners (basis limits)	Pass to owners (basis limits)
QSBS (Section 1202)	Eligible	Not eligible	Not eligible
Formalities	Board, bylaws, minutes, stock ledger	Same as corporation	Operating agreement; fewer formalities

Federal income tax

C corp

Corporation pays 21%; dividends taxed again

S corp

Pass-through; no entity-level federal tax

LLC (default tax)

Pass-through; no entity-level federal tax

Tax return

C corp

Form 1120

S corp

Form 1120-S + K-1s

LLC (default tax)

Schedule C (one owner) or Form 1065 + K-1s

Owners

C corp

Unlimited; anyone, including foreign persons and companies

S corp

Up to 100; US individuals and certain trusts/estates only

LLC (default tax)

Unlimited; anyone

Classes of ownership

C corp

Multiple classes of stock (e.g. preferred)

S corp

One class of stock

LLC (default tax)

Flexible allocations by agreement

Owner pay

C corp

Salary; dividends

S corp

Reasonable salary + distributions

LLC (default tax)

Draws; profit subject to SE tax

Losses

C corp

Stay in the corporation

S corp

Pass to owners (basis limits)

LLC (default tax)

Pass to owners (basis limits)

QSBS (Section 1202)

C corp

Eligible

S corp

Not eligible

LLC (default tax)

Not eligible

Formalities

C corp

Board, bylaws, minutes, stock ledger

S corp

Same as corporation

LLC (default tax)

Operating agreement; fewer formalities

The S corp is a tax election available to corporations (and LLCs) that meet strict eligibility rules. It keeps the corporate legal structure but passes profits through to owners, avoiding the corporate layer. The LLC is the most flexible: by default it's taxed as a sole proprietorship or partnership, but it can elect to be taxed as an S corp or C corp. Our LLC vs S corp guide covers the payroll-tax savings of the S election in detail.

When a C corp makes sense

A C corp is usually the right choice when at least one of these is true:

1. You'll raise venture capital. Institutional investors typically want preferred stock with liquidation preferences, which an S corp can't issue, and many funds have tax-exempt or foreign limited partners who can't easily hold pass-through interests. Most venture-backed startups are Delaware C corps.
2. You want QSBS. If your business is in a qualifying industry and you expect a large exit, the Section 1202 exclusion, now available in part after three years, can outweigh years of double taxation.
3. You'll reinvest most profits. If profits fund growth rather than owner draws, paying 21% now beats paying up to 37% on pass-through income.
4. You have foreign, corporate or many owners. Non-resident aliens, partnerships and corporations can't own S corp stock, and an S corp is capped at 100 shareholders.
5. You want equity compensation. Incentive stock options can only be granted by corporations.

A C corp is usually the wrong choice when you're a service business that distributes its profits, when you expect early losses you'd like to deduct personally (C corp losses stay inside the corporation as net operating losses), or when you may sell the business as an asset sale, which can trigger tax at both levels.

Switching later is possible but not free. An LLC can elect C corp taxation with Form 8832. A C corp that converts to an S corp can owe built-in gains tax if it sells appreciated assets within five years of the switch. Converting from S to C is easier, but you generally can't re-elect S status for five years.

State corporate and franchise taxes

Federal tax is only part of the bill. Most states tax corporate income, and many charge a franchise tax or minimum tax just for existing or doing business there. If you incorporate in one state and operate in another, you'll typically pay in both: in your state of incorporation, and in the state where you register as a foreign corporation.

• Delaware. Corporations formed in Delaware file an annual report and pay franchise tax by March 1. The minimum tax is $175 under the authorized shares method or $400 under the assumed par value capital method, plus a $50 annual report fee. Startups with millions of authorized shares often get alarming bills under the default method and should recalculate using the assumed par value method. Our Delaware registered agent guide covers the filing.
• California. Corporations doing business in California pay 8.84% of net income, with an $800 minimum franchise tax. Newly incorporated or qualified corporations are exempt from the minimum tax in their first taxable year. California also doesn't follow the federal QSBS exclusion.
• Texas. There's no corporate income tax, but the franchise (margin) tax applies to corporations and LLCs. Entities with annualized revenue at or below $2.65 million owe no tax but must still file reports.
• North Carolina. The corporate income tax rate is 2% for 2026, and corporations pay a separate franchise tax with a $200 minimum.

Rules, rates and minimums change often, so confirm with your state revenue department before you choose where to incorporate. For a small business operating in one state, incorporating at home is usually simpler and cheaper than Delaware.

Common C corp mistakes

• Treating corporate money as yours. Paying personal bills from the corporate account muddles the books, invites disguised-dividend findings and weakens your liability shield. Pay yourself a salary or a declared dividend.
• Skipping the paperwork. Missing board consents, stock issuances never documented, or no 83(b) election filed within 30 days for restricted founder stock are costly to fix during an investor's due diligence.
• Unreasonable compensation. Too high, and the IRS may treat part as a dividend. Too low in a corporation that also pays dividends, and you may draw questions about payroll taxes. Benchmark against what you'd pay an outsider.
• Choosing a C corp for a lifestyle business. If you'll take every dollar out, you'll likely pay more than you would through a pass-through.
• Forgetting state minimums. Even a dormant corporation can owe Delaware or California minimum taxes every year until it's formally dissolved.

How to form a C corp

Setting up a C corporation

1. 1

   Pick the state and name

   Most small businesses incorporate where they operate; venture-backed startups usually choose Delaware. Check name availability with the Secretary of State.

2. 2

   File articles or a certificate of incorporation

   List the authorized shares, registered agent and incorporator. State filing fees vary.

3. 3

   Adopt bylaws and appoint directors

   Hold an organizational meeting or sign a written consent appointing officers and approving stock issuance.

4. 4

   Issue stock and file any 83(b) elections

   Record each issuance in the stock ledger. File 83(b) with the IRS within 30 days for stock subject to vesting.

5. 5

   Get an EIN and open a business bank account

   Apply free on IRS.gov. Keep corporate funds fully separate.

   EIN application guide
6. 6

   Register for state taxes and calendar deadlines

   Form 1120 by the 15th day of the 4th month, quarterly estimates, state annual reports and franchise tax.

Once you're running, keep a simple annual routine: board approval of officer salaries and any dividends, minutes or written consents for major decisions, an updated cap table, Form 1120 and state returns on time, and payroll for every owner who works in the business. If you're still choosing between structures, read our LLC vs sole proprietorship and LLC vs S corp guides, then talk to a CPA with your real numbers before you file.

Official links

• IRS — Instructions for Form 1120Corporate return, due dates, 21% rate
• IRS — Form 2553 (S corporation election)Electing out of C corp taxation
• IRS — Form 8832 (entity classification election)An LLC electing to be taxed as a corporation
• IRS — Topic 559, Net investment income tax3.8% tax on dividends above the threshold
• 26 U.S.C. § 1202 — Qualified small business stockCurrent text including July 2025 amendments
• SBA — Choose a business structureComparison of entity types
• California FTB — CorporationsMinimum franchise tax and first-year exemption

This is general information, not legal or tax advice — confirm on the official source or with a professional.

Frequently asked questions

What does C corp mean?

A C corp is a corporation taxed under Subchapter C of the Internal Revenue Code. It's a separate legal entity owned by shareholders and run by a board of directors. It files its own federal return, Form 1120, and pays corporate income tax on its profits at a flat 21%. Shareholders pay tax again on dividends they receive.

Is a C corp better than an LLC?

Not for most small, owner-run businesses that pay out their profits, because an LLC's profits are taxed once on the owners' returns. A C corp is usually better if you plan to raise venture capital, want to qualify for the QSBS gain exclusion, need to reinvest most profits in the business, or have foreign or many shareholders. An LLC can also elect to be taxed as a C corp.

What is double taxation in a C corp?

Double taxation means the same profit is taxed twice: first by the corporation at 21%, then by shareholders when the after-tax profit is paid out as dividends, at 0%, 15% or 20% for qualified dividends plus the 3.8% net investment income tax for higher earners. Salaries paid to owner-employees are deductible, so they're taxed only once.

Can an LLC be a C corp?

An LLC is a state-law entity, and by default the IRS taxes a single-member LLC as a sole proprietorship and a multi-member LLC as a partnership. The LLC can file Form 8832 to elect to be taxed as a corporation, which makes it a C corp for federal tax purposes, or Form 2553 to be taxed as an S corp.

What changed for QSBS in 2025?

The One Big Beautiful Bill Act, signed July 4, 2025, changed Section 1202 for C corp stock issued after that date. Holders can now exclude 50% of gain after three years, 75% after four and 100% after five. The per-issuer cap rose from $10 million to $15 million, and the corporation's gross-asset limit rose to $75 million.

Do C corps pay state taxes?

Usually, yes. Most states tax corporate income, and many also charge a franchise or minimum tax. California charges 8.84% of net income with an $800 minimum. Delaware charges franchise tax on corporations formed there, starting at $175. Texas taxes margins only above $2.65 million of revenue.

Sources & verification

Figures on this page were checked against the sources below when it was last reviewed on 9 October 2026. Each rate and limit is stored once with its own official source and review date, and official update channels are monitored daily so changes are picked up. How we verify

1. 1.Instructions for Form 1120 (2025) — IRS · accessed 9 October 2026
2. 2.Revenue Procedure 2025-32 (2026 inflation adjustments) — IRS · accessed 9 October 2026
3. 3.Topic no. 559, Net investment income tax — IRS · accessed 9 October 2026
4. 4.26 U.S. Code § 1202 — Partial exclusion for gain from certain small business stock — Legal Information Institute, Cornell Law School · accessed 9 October 2026
5. 5.26 U.S. Code § 531 — Imposition of accumulated earnings tax — Legal Information Institute, Cornell Law School · accessed 9 October 2026
6. 6.Choose a business structure — U.S. Small Business Administration · accessed 9 October 2026
7. 7.Corporations — minimum franchise tax — California Franchise Tax Board · accessed 9 October 2026
8. 8.Business tax rates — California Franchise Tax Board · accessed 9 October 2026
9. 9.Focus on QSBS Provisions in the One Big Beautiful Bill Act — Gibson Dunn · accessed 9 October 2026