How are capital gains taxed in Washington in 2025?

Washington has no ordinary income tax but levies a 7% excise on long-term capital gains above a standard deduction ($278,000 for 2025); gains over $1,000,000 are taxed at 9.9%. On top of that, the federal government taxes long-term gains at 0%, 15%, or 20% (and short-term gains at ordinary rates), and high earners may owe the 3.8% Net Investment Income Tax.

Does the 3.8% Net Investment Income Tax apply?

It can. The NIIT adds 3.8% on the lesser of your net investment income and the amount your modified AGI exceeds $200,000 (single or head of household), $250,000 (married filing jointly), or $125,000 (married filing separately). These thresholds are set by statute and are not adjusted for inflation. This calculator includes it automatically.

Is my data sent anywhere when I use this calculator?

No. All calculations run entirely in your browser using JavaScript. No amounts, inputs, or personal data are ever transmitted to any server.

Washington Capital Gains Tax 2025 — Federal 0/15/20% + NIIT + State

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Washington Capital Gains Tax 2025

This calculator works out the total tax on a capital gain in Washington for the 2025 tax year — the federal 0% / 15% / 20% long-term rate, the 3.8% Net Investment Income Tax for high earners, and the Washington state portion. Washington levies a 7% excise on long-term capital gains above a large standard deduction.

Federal long-term gains (assets held over one year) are taxed at 0%, 15%, or 20% by total taxable income. For 2025 the 0% band runs to $48,350 (single) or $96,700 (married filing jointly), 15% up to $533,400 (single) or $600,050 (joint), and 20% above. Short-term gains are taxed at ordinary federal rates. High earners also owe the 3.8% Net Investment Income Tax (NIIT) on the lesser of the gain and modified AGI over $200,000 (single) / $250,000 (joint) / $125,000 (married filing separately).

Enter your gain, your other taxable income, your filing status and holding period below. Washington has no ordinary income tax but levies a 7% excise on long-term capital gains above a standard deduction ($278,000 for 2025); gains over $1,000,000 are taxed at 9.9%. Everything runs in your browser — no amounts or personal data are transmitted.

Estimate, not tax advice. local/city taxes and special-rate assets (collectibles, qualified small-business stock, depreciation recapture) are not included. Verify with the IRS and the Washington tax authority.