How do I collect sales tax legally?

How to Legally Collect Sales Tax in Washington State

Collecting sales tax in Washington requires understanding state-specific registration, rate application, and reporting obligations. Follow these operational steps to ensure compliance and smooth business operations.

Register for a Washington State Business License and Tax Account

• Register with the Washington Department of Revenue (DOR): Before collecting sales tax, obtain a business license and a tax registration number through the Washington Business Licensing Service.
• Specify sales tax collection: During registration, indicate that you will be collecting retail sales tax to receive the appropriate tax account.

Determine the Correct Sales Tax Rate

• Apply combined state and local rates: Washington sales tax includes a state rate plus local city and county taxes. Rates vary by location.
• Use the Department of Revenue’s rate lookup tool: Verify the correct rate for your business location and customer delivery addresses.

Collect Sales Tax at the Point of Sale

• Include sales tax in customer transactions: Add the correct sales tax amount to the sale price at checkout.
• Use automation tools: Consider sales tax software or point-of-sale systems integrated with Washington tax rates to reduce errors and streamline collection.

Maintain Accurate Records and Report Sales Tax

• Keep detailed sales and tax collected records: Maintain records for each transaction, including the tax amount charged and customer location.
• File returns on time: As of 2026, Washington requires periodic sales tax returns—monthly, quarterly, or annually—based on your sales volume.
• Remit collected taxes: Submit collected sales tax to the Washington Department of Revenue by the due dates to avoid penalties.

Additional Operational Considerations

• Employee training: Train staff on sales tax collection procedures and system use.
• Stay updated: Monitor Washington tax rate changes and compliance requirements regularly.
• Audit readiness: Keep organized records to simplify potential state audits.