C Corporation (C Corp): Definition, Taxes, and How to Form One
Last updated 05/18/2026 by
Ante Mazalin
Edited by
Andrew Latham
Summary:
A C corporation (C corp) is the standard corporate structure under U.S. law, recognized as a legal entity separate from its owners and subject to corporate income tax on its profits.
It differs from other business structures in several ways that affect taxes, ownership, and the ability to raise capital.
- Double taxation: A C corp pays corporate income tax on profits, and shareholders pay personal income tax again on any dividends they receive.
- Unlimited shareholders: Unlike an S corp, a C corp can have an unlimited number of shareholders, including foreign investors and institutions.
- Preferred for investment: Venture capital firms and private equity funds typically require the C corp structure before investing in a startup.
- Liability protection: Shareholders are generally not personally liable for corporate debts or legal judgments against the company.
Choosing a business structure is one of the most consequential decisions a founder makes. For companies planning to raise outside capital, hire employees with equity, or eventually go public, the C corp is typically the right answer from day one.
How a C corporation works
A C corp is formed by filing articles of incorporation with a state government. Once incorporated, the business becomes a separate legal entity that can own property, enter contracts, and be sued independently of its owners.
The corporation is governed by a board of directors elected by shareholders, with day-to-day operations managed by officers such as a CEO or CFO appointed by the board.
Profits are taxed at the corporate level at a flat 21% rate, established by the Tax Cuts and Jobs Act of 2017. When after-tax profits are distributed to shareholders as dividends, shareholders also owe personal income tax on those distributions, creating the “double taxation” that distinguishes C corps from pass-through structures like LLCs and S corporations.
C corp vs. S corp vs. LLC
The three most common U.S. business structures differ primarily on taxes, ownership limits, and fundraising compatibility.
| Feature | C Corp | S Corp | LLC |
|---|---|---|---|
| Taxation | Double taxation (corporate + dividend) | Pass-through to shareholders | Pass-through by default |
| Shareholder limit | Unlimited | 100 maximum | No limit (members) |
| Foreign investors allowed | Yes | No | Yes |
| Multiple stock classes | Yes | No (one class only) | Flexible membership interests |
| VC/PE investment compatible | Yes (preferred structure) | Generally incompatible | Uncommon |
| Can go public (IPO) | Yes | Must convert to C corp first | Must convert to C corp first |
Pro Tip
If you reinvest profits into the business rather than distributing them as dividends, the double taxation disadvantage shrinks considerably. Retained earnings stay inside the corporation taxed only at the 21% corporate rate until distributed. Founders expecting venture capital or an acquisition typically should incorporate as a C corp from day one — converting from an LLC or S corp later can trigger taxes and legal complexity that are expensive to unwind.
Advantages and disadvantages of a C corp
The C corp offers significant advantages for growth-oriented businesses, but comes with administrative requirements and tax costs that smaller businesses may not need.
Advantages:
- Unlimited growth potential: No cap on the number or type of shareholders makes the C corp the only structure compatible with a stock exchange listing.
- Capital raising: Venture capital funds are legally structured in ways that make holding S corp stock impossible, so the C corp is effectively required to attract institutional investment.
- Liability protection: Shareholders’ personal assets are shielded from corporate debts and lawsuits, provided corporate formalities are maintained.
- Employee benefits deductions: C corps can deduct the cost of employee health insurance, retirement contributions, and other benefits as business expenses.
- Perpetual existence: The corporation continues even if ownership changes or founders depart.
Disadvantages:
- Double taxation: Dividends paid to shareholders are taxed first at the corporate level, then again as personal income, reducing after-tax returns compared to pass-through structures.
- Administrative burden: C corps must hold annual board meetings, maintain a registered agent, file separate corporate tax returns (Form 1120), and keep detailed records.
- Formation and compliance costs: State incorporation fees, registered agent fees, and ongoing filings apply even in unprofitable years.
How to form a C corporation
- Choose a state of incorporation: Delaware is the most common choice for startups due to its established corporate laws and Court of Chancery. For small local businesses, the home state is often sufficient.
- Select and register a name: The name must be unique within the state and include a designator such as “Corporation,” “Incorporated,” “Corp.,” or “Inc.”
- File articles of incorporation: Submit this document to the state secretary of state. It includes the company name, registered agent address, and number of authorized shares.
- Appoint a board of directors: Initial directors are named in the articles or appointed at the first organizational meeting.
- Draft corporate bylaws: Bylaws govern internal operations including meeting procedures, voting rights, officer roles, and decision-making authority.
- Obtain an EIN: Apply for a federal Employer Identification Number through the IRS to open a business bank account and file corporate taxes.
- Issue shares and maintain records: Document the initial stock issuance, maintain a shareholder register, and keep minutes for all board and shareholder meetings.
Once active, a C corp files Form 1120 annually for corporate income taxes, separate from any personal filings by its shareholders or officers.
Related reading on business structures
- S corporation — covers the pass-through tax structure that lets small businesses avoid double taxation, and the shareholder eligibility rules that distinguish it from a C corp.
- LLC — explains the limited liability company structure, combining personal liability protection with flexible pass-through taxation and fewer corporate formalities.
- Sole proprietorship — the simplest business structure with no legal separation between owner and business, and how it compares to incorporating.
Frequently asked questions
What is the main difference between a C corp and an S corp?
A C corp is taxed at the corporate level and again when dividends are distributed to shareholders. An S corp passes income directly to shareholders’ personal returns, avoiding corporate-level tax. S corps are also limited to 100 U.S. citizen or resident shareholders and one class of stock, while C corps have no such restrictions.
Why do most startups choose the C corp structure?
Venture capital funds are typically structured as partnerships that cannot legally hold S corp stock. Because most startup funding comes from VC firms, the C corp is effectively required to attract institutional investment. Delaware C corps also benefit from a specialized business court that provides predictable outcomes in corporate disputes.
Is a C corp always subject to double taxation?
Only when profits are distributed as dividends. If the corporation retains earnings and reinvests them in the business, those profits are taxed only once at the 21% corporate rate. Double taxation occurs at the point of distribution to shareholders, not simply from being a C corp.
Can a C corp convert to an S corp?
Yes, by filing IRS Form 2553 and meeting eligibility requirements: no more than 100 shareholders, all must be U.S. citizens or residents, and only one class of stock is permitted. Conversion can trigger built-in gains tax on assets that appreciated during the C corp period, so consulting a tax advisor before converting is strongly recommended.
What state should I incorporate my C corp in?
Delaware is the most popular choice for venture-backed companies due to its Court of Chancery and extensive corporate case law. Smaller businesses operating in a single state often incorporate locally to avoid paying registration fees and taxes in two jurisdictions.
Key takeaways
- A C corp is the default U.S. corporate structure, taxed at a flat 21% corporate rate with shareholders also taxed on dividends received.
- Unlike S corps, C corps can have unlimited shareholders including foreign investors, making them the required structure for venture capital and IPOs.
- Double taxation is the primary disadvantage, though it is reduced when profits are reinvested rather than distributed.
- Delaware is the most popular incorporation state due to established corporate law and its specialized Court of Chancery.
- C corps must file Form 1120 annually, hold board meetings, and maintain corporate records, adding cost relative to simpler structures.
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