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Washington: corporate tax rates

The top state corporate income tax rate in each state, and whether it is flat or graduated.

Single detailed source
Top corporate income tax rateNone: gross receipts tax instead
Rate structureNo corporate income tax

Rates are for 2026. Most small businesses are taxed as pass-throughs under the individual income tax instead. The federal corporate rate of 21% applies on top.

General information only, not legal, insurance or financial advice. Not affiliated with any government agency. Exceptions can apply. Confirm with the state agency, the court or a licensed professional in Washington.

How Washington compares

Washington has no set figure for this measure.

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How we checked this

Rates come from the Tax Foundation's table of 2026 state corporate income tax rates and brackets. Last checked: November 12, 2026. Laws change; confirm with the state agency or a licensed professional before acting.

Cross-checked sources agree   Checked on official source confirmed on a government, court or legislature site   Single detailed source one detailed table built from statutes or official data   Under review sources disagree; read the note and the law.