A C corporation is a business incorporated under state law and taxed as its own entity under Subchapter C of the Internal Revenue Code. It pays federal income tax on its profits at a flat 21%, and shareholders pay a second tax when those after-tax profits come out as dividends. In exchange for that double layer of tax, a C corp offers unlimited fundraising flexibility, perpetual existence, and a liability shield between the business and its owners. Every corporation formed in the United States is a C corporation by default unless it files an election to be taxed differently.
Who Actually Needs a C Corporation
The difference between a C corporation and an S corporation is a tax election, not a legal one. Both are corporations under state law with the same governance rules. An S corporation files an election under Subchapter S to pass its income through to shareholders and skip the corporate-level tax. A C corporation makes no such election.
Not every business can choose S status. Federal law limits S corporations to domestic companies with no more than 100 shareholders, a single class of stock, and owners who are U.S. citizens, resident individuals, certain trusts, or qualifying tax-exempt organizations.1Office of the Law Revision Counsel. 26 USC 1361 – S Corporation Defined Nonresident aliens cannot hold S corporation shares at all.
Any company that wants foreign investors, plans to issue preferred stock alongside common, expects to grow past 100 shareholders, or hopes to go public has to operate as a C corporation. That makes the C corp the natural home for venture-backed startups and companies with institutional investors. It also means other corporations, partnerships, and LLCs can hold C corporation stock, which matters when a business sits inside a larger ownership structure.
How C Corporation Taxation Works
The corporation itself is a taxpayer. It files Form 1120, calculates its own taxable income, and pays federal tax at a flat 21% on every dollar of profit.2Office of the Law Revision Counsel. 26 USC 11 – Tax Imposed Most states add their own corporate income tax on top, though a few do not.
The second tax hits when profits leave the company. A distribution is treated as a taxable dividend to the extent of the corporation’s accumulated earnings and profits.3Office of the Law Revision Counsel. 26 USC 301 – Distributions of Property Amounts above earnings and profits first reduce the shareholder’s stock basis, then become capital gains.
Qualified dividends are taxed at preferential capital gains rates of 0%, 15%, or 20%, depending on the shareholder’s taxable income. Shareholders with modified adjusted gross income above $250,000 married filing jointly, or $200,000 single, also owe the 3.8% net investment income tax on top.4Office of the Law Revision Counsel. 26 USC 1411 – Imposition of Tax That pushes the top federal rate on qualified dividends to 23.8%.
Here is what double taxation looks like on paper. A C corporation earns $100,000. It pays $21,000 in federal corporate tax, leaving $79,000. If it distributes the full $79,000 as a dividend to a top-bracket shareholder, the shareholder owes up to $18,802 in federal tax (23.8% of $79,000). Of the original $100,000, roughly $39,800 goes to federal taxes across both layers. That combined rate of almost 40%, before any state tax, is the cost of distributing C corporation profits.
How Owners Legally Reduce the Double Tax
Almost nobody pays the full double tax if the business is closely held. Several legitimate strategies pull money out of the corporation without triggering a dividend.
- Compensation paid to shareholder-employees is deductible by the corporation, which reduces its taxable income. The shareholder pays ordinary income tax and payroll taxes on the salary, but the corporation avoids the 21% tax on that amount. This is the single most common strategy.
- Fringe benefits like employer-paid health insurance, group-term life insurance up to $50,000, and retirement plan contributions are deductible by the corporation and excluded from the employee’s income. This is one area where C corporations have a real edge, because S corporation shareholders who own more than 2% of the stock cannot receive most of these benefits tax-free.5Internal Revenue Service. Publication 15-B (2026), Employer’s Tax Guide to Fringe Benefits
- Retaining earnings avoids the second tax entirely. Money kept in the business is taxed only at 21%. This works when the company needs cash for growth, but it has a limit (see below).
- Reimbursing shareholder-employees for legitimate business expenses under an accountable plan reduces corporate income and is not taxable to the recipient.
The Reasonable Compensation Limit
The salary strategy has a ceiling. The IRS watches for shareholder-employees who overpay themselves to avoid the dividend tax. If compensation is unreasonably high, the IRS can reclassify the excess as a non-deductible dividend. The corporation loses the deduction, and the shareholder still owes tax on the distribution. Courts look at the employee’s qualifications, time devoted to the business, what comparable companies pay for similar roles, and whether the compensation was set at arm’s length. The more a shareholder controls both sides of the pay decision, the more scrutiny it draws.
The Accumulated Earnings Tax
Retaining profits works, but only up to a point. The accumulated earnings tax adds a 20% penalty on corporate income kept beyond the reasonable needs of the business, on top of the regular 21% corporate tax.6Office of the Law Revision Counsel. 26 USC 531 – Imposition of Accumulated Earnings Tax
There is a safe harbor. Most corporations can accumulate up to $250,000 in earnings without penalty risk. Personal service corporations in law, medicine, engineering, accounting, and consulting get a smaller $150,000 safe harbor.7Office of the Law Revision Counsel. 26 USC 535 – Accumulated Taxable Income Above those thresholds, the company needs a documented business reason: expansion, debt repayment, equipment purchases, working capital. Vague future plans do not qualify. The real targets are closely held C corps where a few owners might let profits pile up rather than take a taxable dividend.
Section 1202 Qualified Small Business Stock
One of the strongest reasons to choose a C corporation is Section 1202. When a shareholder sells stock in a qualifying C corporation after holding it long enough, some or all of the capital gain can be excluded from federal income tax.8Office of the Law Revision Counsel. 26 USC 1202 – Partial Exclusion for Gain From Certain Small Business Stock
The One Big Beautiful Bill Act, enacted July 4, 2025, expanded this benefit. For stock issued after that date:
- Gross asset test: At the time of issuance, the corporation’s total gross assets (cash plus adjusted basis of other property) cannot exceed $75 million. The old limit was $50 million.
- Holding period tiers: A 50% exclusion applies after three years, 75% after four years, and 100% after five years. Previously only the five-year, 100% exclusion existed.
- Per-issuer cap: The maximum excludable gain per issuer is the greater of $15 million or 10 times the shareholder’s adjusted basis. The prior cap was $10 million.
- Active business requirement: The corporation must be a domestic C corp in an active trade or business. Finance, professional services, hospitality, and farming are excluded.
Both the $75 million asset threshold and the $15 million cap will be indexed for inflation starting in 2027. Gain excluded under Section 1202 is also exempt from the 3.8% net investment income tax, so the five-year full exclusion is genuinely zero federal tax on that gain. For founders and early investors in qualifying businesses, Section 1202 is often the biggest single reason to operate as a C corporation instead of a pass-through.
Forming a C Corporation
Formation starts with a state filing. You submit Articles of Incorporation or a Certificate of Formation, depending on the state, to the secretary of state’s office. The document names the corporation, states its purpose, identifies a registered agent, and specifies the authorized share count. Filing fees usually run from about $35 to over $200.
Once the state approves the filing, the corporation needs an Employer Identification Number from the IRS. The EIN is the federal tax ID, and you cannot open a bank account, hire employees, or file returns without one. The IRS recommends forming the entity with the state first, then applying.9Internal Revenue Service. Get an Employer Identification Number
A few organizational steps follow. The corporation adopts bylaws covering how the board meets, how officers are appointed, and how shareholders vote. Stock certificates or ledger entries record ownership. An organizational meeting elects the initial board and ratifies the bylaws.
Every state also requires the corporation to keep a registered agent with a physical address in the state of incorporation. The agent receives legal documents, including lawsuit notifications and compliance notices. If the corporation gets sued, the complaint goes to this agent. Letting the registered agent lapse can lead the state to administratively dissolve the corporation.
Governance and the Liability Shield
A C corporation runs through a three-tier structure that separates ownership from control. Shareholders own the company but do not manage it directly; they elect the board and vote on fundamental changes like mergers, charter amendments, or dissolution. The board sets strategy and oversees management, and directors owe fiduciary duties of care and loyalty to the corporation and its shareholders. Officers handle daily operations and report to the board. In a small corporation where the same people fill every role, the roles still need to be formally separated in the records.
That separation is the reason most people incorporate in the first place. A corporation’s debts belong to the corporation, and shareholders generally risk nothing beyond their investment.10U.S. Small Business Administration. Choose a Business Structure But the shield is not automatic. Courts can pierce the corporate veil when the line between owner and company is a fiction: mixing personal and corporate bank accounts, skipping required meetings and records, underfunding the corporation at formation, or using the corporate form to commit fraud. State tests vary, but each version requires something more serious than normal business losses.
Limited liability only works if you actually treat the corporation as separate. Separate bank accounts, meeting minutes, adequate capitalization, and clean records are the price of keeping personal assets out of reach.
Ongoing Compliance
A C corporation carries more paperwork than a sole proprietorship or LLC. Most states require an annual or biennial report and fee, ranging from around $10 to several hundred dollars. Many states also charge a franchise tax or minimum tax regardless of whether the business earned income.
The corporation must hold annual meetings of both shareholders and the board and document significant decisions in formal resolutions and minutes. Skipping these formalities is one of the fastest ways to hand a creditor an argument that the corporation is not truly separate from its owners.
Federally, the corporation files Form 1120 annually and makes quarterly estimated tax payments if it expects to owe $500 or more for the year. Payroll tax obligations start as soon as the corporation has employees, including shareholder-employees who take a salary. State filing obligations vary but typically follow the federal pattern.