Corporate Tax Calculator (C-Corp)

C-Corporations face a federal tax bill calculated at a flat 21% rate, and this tool estimates that liability alongside any state tax your corporation owes. It also lays out the double taxation problem that defines the C-Corp structure: profits are taxed once at the company level, then taxed again when distributed to owners as dividends. Seeing both layers together helps when weighing whether a C-Corp is the right structure for your business.

Taxable income is gross revenue minus business expenses and officer compensation. State tax comes first, at 2026 rates: 11 states tax it in graduated slices (Alaska, Hawaii, Iowa, Kansas, Maine, Mississippi, New Mexico, North Dakota, Oregon, Vermont, and Florida after a $50,000 exemption), New Jersey and New York apply one rate to the whole income by size (New Jersey 6.5% up to $50,000, 7.5% up to $100,000, 9% up to $10 million and 11.5% above with the Corporate Transit Fee; New York 6.5%, or 7.25% above $5 million), and the rest charge a single rate. Federal tax is the flat 21% on taxable income after subtracting that state tax, because state income tax is a deductible business expense. On the dividend side, you enter the dollar amount paid out to shareholders, and the tool applies a flat 15% to it, the middle of the 0%, 15% and 20% qualified-dividend rates, so the second layer of taxation is visible rather than hidden.

State income tax is easy to overlook, yet it can move your total burden considerably depending on where you operate. It also helps to recall that the 21% federal rate is a single flat percentage, not a graduated bracket schedule like the one individuals face. Treat every figure here as an estimate and confirm specifics with a tax professional, since compliance details vary.