Tools · Capital Gains Tax
Washington Capital Gains Tax Calculator (2026)
Estimate the tax on your capital gains in Washington for 2026. Enter your gain, holding period, and other income to see federal long- or short-term tax, the 3.8% Net Investment Income Tax, and Washington’s share, broken out line by line.
Washington capital gains tax calculator
- Gain taxed at 0% (long-term)
- $15,550 → $0
- Gain taxed at 15% (long-term)
- $4,450 → −$668
- Federal long-term capital gains tax
- −$668
- Net Investment Income Tax (3.8%)
- $0
- Washington capital gains tax
- $0
- Total capital gains tax
- $668
Washington taxes only long-term capital gains above a yearly threshold — not wages. The $278,000 threshold is the 2025 figure; the 2026 indexed amount was not yet posted at build.
Note on 2026 figures: Capital-gains threshold shown is the 2025 figure ($278,000); the 2026 inflation-indexed amount had not been released. Wage income is unaffected — it is untaxed either way.
Federal: IRS Revenue Procedure 2025-32 (IR-2025-103) · Social Security Administration. State: Washington Department of Revenue.
Estimate for 2026. Long-term gains are stacked on top of your other taxable income across the 0/15/20% federal breakpoints; short-term gains are taxed as ordinary income. The 3.8% Net Investment Income Tax applies once your income clears the threshold. Excludes state credits, the alternative minimum tax, and loss carryovers. This is general information, not tax advice.
How capital gains tax works in Washington
Long-term gains (assets held more than a year) get the federal 0/15/20% rates — but the rate depends on where the gain lands once it is stacked on top of your other taxable income, so part of a gain can be taxed at 0% and the rest at 15%. Short-term gains are taxed as ordinary income. On top of that, the 3.8% Net Investment Income Tax applies once your income clears $200,000 (single) or $250,000 (married-jointly).
Washington taxes only long-term capital gains above a yearly threshold — not wages. The $278,000 threshold is the 2025 figure; the 2026 indexed amount was not yet posted at build.
This is an annual-bracket estimate, not your final return. It excludes the alternative minimum tax, loss carryovers, and state credits. It is general information, not tax advice. Federal figures: IRS Revenue Procedure 2025-32 (IR-2025-103) · Social Security Administration.
Capital gains calculators for other states
Same 2026 engine, each with its own state rules.