Washington capital gains tax estimator

Estimate Washington tax impact from a single sale.

No login required.

How this calculator works

Step 1 calculates your capital gain using cost basis and sale proceeds. If you provide dates, the tool classifies the holding period for reference.

Step 2 applies Washington’s capital gains exclusion and rate to long-term gains.

Step 3 summarizes the Washington excise tax due and reminds you that federal capital gains rules determine your overall tax liability.

Frequently asked questions

Does Washington have a special long-term gain rate?

Washington applies a 7% excise tax on long-term gains above the exclusion amount.

What if I have a loss?

Losses are displayed for context. Check federal rules for how losses offset gains.

Do I need to adjust for residency?

Part-year and nonresident filers should prorate Washington-source income using the allocation percent on their return.

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This tool estimates Washington tax impact only and is not legal or tax advice.

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