Washington . Sales Tax Permit
Washington sales tax permit / seller's permit.
If your business sells taxable goods or services in Washington, you need a sales tax permit (also called a seller's permit). This guide explains nexus rules, post-Wayfair economic thresholds, the application process, and ongoing filing frequency.
Register for Washington sales tax →When you need a Washington sales tax permit
Washington requires sales tax registration once your business has nexus in the state. Nexus can be:
Physical nexus . office, warehouse, employee, inventory, or affiliate in Washington.
Economic nexus (post-Wayfair) . reaching a sales or transaction threshold without any physical presence. Most Washington thresholds: $100,000 in sales or 200 transactions in the prior or current calendar year.
Click-through or marketplace nexus . commission-based referrals or marketplace facilitator obligations.
Where this page sits
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Guide
Sales Tax Permit by state
The national explainer above this page: what changes between jurisdictions, and why.
Open the hub → SectionSecretary of State directory
Every filing the state business office takes, state by state.
Open the section → StateWashington business filings
Every filing a business makes in Washington, gathered on one page.
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