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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.

How to register for Washington sales tax

  1. 1Form your entity and obtain an EIN.
  2. 2Register with the Washington Department of Revenue. Application asks for entity info, NAICS code, projected gross sales.
  3. 3Receive your Washington permit number. Display it where required.
  4. 4File returns on the assigned cadence. Monthly, quarterly, or annually based on projected revenue.
FAQ

Frequently asked questions

Do I need a Washington sales tax permit?
If you sell taxable goods or services in {s["name"]} and have nexus (physical or economic), yes.
How much does a Washington sales tax permit cost?
Most states issue sales tax permits free. Some charge a small registration fee.
What is the Washington economic nexus threshold?
Common thresholds: $100,000 in sales or 200 transactions per year. Verify current {s["name"]} thresholds with the Department of Revenue.
Do I need to register for sales tax if I sell on Amazon or Etsy in Washington?
Marketplace facilitator laws often shift collection to the platform. You may still need to register and file zero-returns. State-specific.
How often do I file Washington sales tax returns?
Monthly, quarterly, or annually based on projected revenue. The Department of Revenue assigns frequency at registration.
What if I sell only digital products in Washington?
{s["name"]} taxability of digital products varies. Some are taxable, some not. Check current rules.
Does File.Business handle Washington sales tax registration?
Yes. We complete the application, deal with the Department of Revenue, and deliver the permit.

Ready to handle this the easy way?

Five minutes per filing. State fee passed through at cost. Audit trail and deadline tracking included.

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Disclosure. File.Business is a private business filing and compliance service. We are not a government agency and are not affiliated with the WA Secretary of State or any Secretary of State office. You may file directly with the WA Secretary of State. Information on this page is for general guidance only and is not legal, tax, or accounting advice. Fees and deadlines verified against the WA Secretary of State as of June 2026 and may change. For entity-specific guidance, consult a licensed Washington attorney or CPA.

Register Washington sales tax →
File.Business is a private business filing and compliance service. We are not a government agency and are not affiliated with any Secretary of State office. You may file directly with the appropriate state agency. SOC 2 Type II audited. 220,000+ businesses formed since 2017.