Company Tax Calculator

How to use

1. Enter expected taxable profit for the year in dollars.
2. Enter your state's corporate income tax rate as a percent, or 0 if none.
3. Read federal tax, state tax, after-tax profit, and the combined effective rate.
4. Re-run at a few profit levels to see the flat 21 percent scale linearly.

General information only — not medical, financial or legal advice. Figures cross-checked against public official sources (IRS / HMRC / NHS / WHO guidance); content last reviewed September 2026. For decisions that matter, confirm with a licensed professional in your country.

About this tool

Price the entity-level tax on C-corporation profit. Federal tax is a flat 21 percent of taxable profit, a rate unchanged since 2018, and your state adds whatever corporate rate applies, from zero to roughly 9 or 10 percent in the highest-tax states. Defaults of 250,000 dollars of profit with a 5 percent state rate produce 52,500.00 dollars federal, 12,500.00 dollars state, 185,000.00 dollars of after-tax profit, and a 26.0 percent combined effective rate. Pass-through entities such as partnerships and S corporations shift profit to owners' individual returns and would compute very differently. Net operating loss carryforwards, credits, and state minimum or franchise taxes are outside this simple model. Simplified C-corp model: flat 21 percent federal, entered state rate, no credits, apportionment, NOLs, franchise taxes, or book minimum tax; verify with official sources; not tax advice.The combined rate here is arithmetic, not a filing prediction: credits, apportionment for multistate income, and the 80 percent limit on deducting NOLs all move the real number. Dividends add a second layer when profit leaves the company. C corporations also file Form 1120 and owe estimated payments through the year, costs of administration that pass-throughs avoid at the entity level.

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