Free Tool
US Corporate Tax Calculator
Estimate your US federal corporate tax in seconds. Enter your annual taxable profit to see the flat 21% federal rate applied. State-level corporate taxes are not included — confirm your combined liability with a qualified tax adviser.
Estimate only — for general guidance, not tax advice. Actual liability depends on your entity type, ownership, elections, state rules and your specific facts. Confirm with a qualified tax adviser.
Static example (no JavaScript required)
On an annual taxable profit of $500,000 (USD), the estimated federal corporate tax at the flat 21% rate is $105,000 (USD), leaving an after-tax profit of $395,000 (USD).
How US federal corporate tax works
The United States levies a federal corporate income tax at a flat 21% rate on taxable income. The flat rate was set by the Tax Cuts and Jobs Act of 2017, replacing the former graduated brackets, and applies to C corporations for tax years beginning after December 31, 2017.
Because the federal rate is flat, every dollar of taxable profit is taxed at 21% — there is no exemption band. Most states levy a separate state corporate income or franchise tax, which this calculator does not model.
Taxable income starts from book income, then is adjusted for deductions, credits and elections (for example bonus depreciation under Section 168(k) or Section 179 expensing). Pass-through entities — S corporations, partnerships and sole proprietorships — are generally not taxed at the entity level; their owners report the income on personal returns.
C corporations generally must pay quarterly estimated federal tax and file Form 1120 by the 15th day of the 4th month after the tax year ends. Every company should confirm its filing calendar and combined federal/state position with a qualified US tax adviser.
Frequently asked questions
- The federal corporate income tax rate is a flat 21% on taxable income, set by the Tax Cuts and Jobs Act of 2017 and in effect since the 2018 tax year. There are no federal exemption bands.
- Multiply your taxable profit (book income adjusted for tax purposes) by 21%. For example, on a taxable profit of $500,000 the federal tax is $105,000.
- No. Most states levy their own corporate income or franchise tax, at rates and bases that vary by state. Combine this federal estimate with your state rules for a full picture.
- Generally no. S corporations, partnerships and sole proprietorships pass income through to owners, who pay individual income tax (with a possible qualified business income deduction). C corporations pay the 21% entity-level tax.
- C corporations file Form 1120 and generally must make quarterly estimated tax payments. Returns are due by the 15th day of the 4th month after the tax year ends. Confirm your exact obligations with a qualified tax adviser.
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