Washington State Tax Forms (2026 & 2027 Guide)

Washington is one of the few states with no traditional state income tax, which means most individuals do not file a state income tax return.

However, there are still important tax forms related to specific types of income and business activity.

Understanding which forms apply to your situation can help you stay compliant and avoid surprises.

Individual Income Tax Forms

Washington does not require a general income tax return for wages or salary.

• No standard state income tax return required
• No equivalent to a federal-style Form 1040

Example: If you earn $80,000 in wages in Washington, you do not file a state income tax return.

Capital Gains Tax Forms

Washington does have a tax on certain capital gains.

• Washington Capital Gains Tax Return → Applies to qualifying gains above the threshold

This tax generally applies to profits from the sale of assets like stocks or business interests, with some exclusions.

Example: If you sell investments and have large capital gains above the exemption amount, you may need to file this return.

Business and Occupation (B&O) Tax Forms

Businesses in Washington must report income using B&O tax forms.

• Excise Tax Return → Used to report business income
• B&O Tax Classification schedules → Based on business activity

These are filed with the Washington Department of Revenue.

Sales and Use Tax Forms

Businesses that sell goods or services must collect and report sales tax.

• Sales and Use Tax Return
• Reseller Permit
• Exemption Certificates

These forms are used to report and remit sales tax collected from customers.

Other Washington Tax Forms

Depending on your situation, additional forms may apply.

• Property tax exemption forms (for seniors and qualifying individuals)
• Real estate excise tax forms
• Specialty tax forms for certain industries

These are typically handled at the local or state agency level.

Who Needs to File in Washington

You may need to file Washington-related tax forms if you:

• Have significant capital gains subject to state tax
• Operate a business in Washington
• Sell taxable goods or services
• Qualify for property tax exemptions or special programs

Most wage earners without investment or business activity have no state filing requirement.

Electronic Filing Recommendation 💻

• Use the Washington Department of Revenue’s online system for capital gains and business filings
• Apply for property tax exemptions online when available
• Keep digital records of all transactions and filings
• File federal taxes electronically to ensure faster processing and fewer errors

Summary

Washington does not require a traditional state income tax return, but certain forms still apply for capital gains, businesses, and sales taxes.

Understanding which forms apply to your situation—especially for investments or business activity—can help you stay compliant and avoid penalties.