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How to Calculate 2025 Washington State Income Tax by Using State Income Tax Table

1. Find your income exemptions

2. Find your pretax deductions, including 401K, flexible account contributions ...

3. Find your gross income

4. Check the 2025 Washington state tax rate and the rules to calculate state income tax

5. Calculate your state income tax step by step

6. If you want to simplify payroll tax calculations, you can download ezPaycheck payroll software, which can calculate federal tax, state tax, Medicare tax, Social Security Tax and other taxes for you automatically. You can try it free for 30 days, with no obligation and no credt card needed.

Learn more about the in house payroll tax solution for Washington small businesses here.
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ezPaycheck: Small Business Payroll Solution


Washington State Tax Tables

Tax rate used in calculating Washington state tax for year 2025

Overview
Personal Income Taxes
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More Payroll Information for Washington Small Business

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  • How to file tax forms

  • How to enter the paychecks for after the fact payroll