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Washington State Tax Calculator (2026-2028)
Estimate your Washington tax liability under ESSB 6346 (the 9.9% income tax, effective 2028) and Washington's separate capital gains excise tax (chapter 82.87 RCW: 7%, plus a 2.9% surtax on gains above $1,000,000). The two regimes are coordinated by a nonrefundable credit (ESSB 6346 sec. 205), so the same long-term gain is not taxed twice.
Worked example
A Washington resident in 2028 with $5,000,000 of long-term capital gain and no other income pays about $441,250 - entirely under the capital gains tax. The 9.9% income tax also reaches the gain, but the section 205 credit for capital gains tax paid offsets it to zero. Net result: you effectively pay the greater of the two regimes, not their sum.
This tool provides estimates only and is not legal or tax advice. Consult a qualified attorney or CPA for your situation.