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.

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

Washington capital gains tax calculator

Quick answer

Washington does not levy a broad-based state income tax on wages in the current TaxGuide Pro calculator data, although a separate capital gains excise tax can apply. Use this Washington capital gains tax estimator for 2026 state tax planning, then verify the estimate with the official state tax agency.

Also answers

  • Washington capital gains tax calculator
  • Washington tax calculator 2026
  • Washington income tax rate 2026
  • Washington state tax refund status

Good fit when

  • Washington residents checking 2026 tax planning
  • Part-year or nonresident Washington filers
  • Comparing state tax, withholding, refund, and deduction scenarios

Have ready

  • Filing status and residency
  • State taxable income or benefit amount
  • Withholding, payments, deductions, credits, or filing date as relevant

Result you get

State-specific estimate, next-step notes, and official Washington source links.

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Washington state facts

Rate rules and worked examples

Examples use 2026 taxable income before credits or residency allocation. Use the official state source below to verify final filing guidance.

Income tax rule

Washington does not levy a broad-based state income tax on wages in the current TaxGuide Pro calculator data, although a separate capital gains excise tax can apply.

Single example

$60,000 single taxable income -> about $0 state income tax before credits.

Joint example

$120,000 married filing jointly taxable income -> about $0 state income tax before credits.

Deductions and exemptions

Residency, local taxes, deductions, credits, and special income rules can change the result.

Credits to review

Review dependent, household, income-based, and other Washington credits in the state credit finder, then confirm eligibility in official instructions.

Filing deadline

For a 2026 return filed in 2027, confirm the due date in published Washington instructions. State deadlines and disaster relief can differ from federal dates.

Refund processing

Washington does not guarantee one refund date for every return. E-filed, accurate returns with direct deposit are generally processed faster than paper or reviewed returns.

Official verification: Washington official tax agency.

How this calculation works

  • Calculates gain from proceeds less cost basis.
  • Estimates the incremental state tax associated with the gain.

Common mistakes and caveats

  • The result is an educational estimate, not a filed return or agency determination.
  • Residency, local taxes, deductions, credits, and special income rules can change the result.
  • Verify current forms, instructions, and deadlines with the official state tax agency.

FAQ

What is the Washington income tax rate for 2026?

Washington does not levy a broad-based state income tax on wages in the current TaxGuide Pro calculator data, although a separate capital gains excise tax can apply. The examples on this page use taxable income before credits, so final results can change when state deductions, credits, or residency allocation apply.

Does Washington tax retirement income?

Washington generally does not tax retirement income through a broad-based state income tax, but federal tax and other state-specific rules can still matter.

Does Washington tax Social Security benefits?

Washington generally does not tax Social Security benefits through a broad-based state income tax.

When will I get my Washington tax refund?

Washington refund timing depends on e-file versus paper filing, direct deposit, return accuracy, identity verification, and seasonal volume. Use the Washington refund timeline estimator and the official refund-status source for live updates.

Where should I verify my Washington tax result?

Use the official Washington revenue or tax agency sources linked in the sources section. TaxGuide Pro is an educational estimator and does not replace a filed state return or agency notice.

Last updated & sources

Last updated August 20, 2026.

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