sales tax · 2026
Washington sales tax registration threshold
Gross sales into Washington (no transaction-count test).
- Measured over
- Previous or current calendar year
- On crossing
- Register for Washington sales tax
What is the Washington sales tax registration threshold?
The Washington sales tax registration threshold is $100,000, measured over the previous or current calendar year. Cross it and you must register for Washington sales tax with the Washington Department of Revenue. You then charge sales tax on sales to customers in Washington.
Do marketplace sales count toward this threshold?
Yes. Washington (sales tax) counts sales made through a marketplace facilitator toward the underlying seller's own threshold. The facilitator collects and remits the tax on those sales, so you are not paying it twice - but the volume still moves you toward the figure on this page, and you can be required to register on the strength of sales somebody else collected on.
Sales through a merchant of record such as Paddle, Polar or Lemon Squeezy are different again: those are the platform's own sales and count toward no threshold anywhere.
Source: Sales Tax Institute, Economic Nexus State Guide, read 2026-08-07.
When do you need to register?
Economic nexus: once your sales into the state pass its threshold (commonly $100k or 200 transactions), you must register and collect that state's sales tax.
Deadline: Register before your next sale - many states apply nexus prospectively from the crossing.
How to register in Washington
- 1Register for a sales-tax permit with the state's Department of Revenue.
- 2Enable tax collection for that state in your checkout / Stripe Tax.
- 3Remit collected tax on the state's filing schedule.
- 4If you're crossing several states, consider a filing service (TaxJar / Avalara).
Shortcut: register for 24 states at once
Washington is a Streamlined Sales Tax member. One free application registers you across every member state simultaneously - and member states pay for a certified service provider to handle your filing.
Washington Department of Revenue - official guidance Sales Tax Institute - Economic Nexus
Don't track Washington by hand.
TaxesRadar reads your Stripe & Paddle sales and warns you the moment you approach this threshold - across every country and US state at once.
Washington sales tax threshold - FAQ
What is the sales tax registration threshold in Washington?
$100,000, measured over previous or current calendar year. Washington has no transaction-count test, so volume of orders alone never triggers registration.
When do I need to register for sales tax in Washington?
Economic nexus: once your sales into the state pass its threshold (commonly $100k or 200 transactions), you must register and collect that state's sales tax. Register before your next sale - many states apply nexus prospectively from the crossing.
Can I register for Washington and other states at once?
Yes. Washington is a Streamlined Sales Tax (SST) member state, so a single free application through the SST registration system registers you in all 24 member states simultaneously - and member states cover the cost of a certified service provider.
Does TaxesRadar file my sales tax for me?
No. TaxesRadar watches your Stripe and Paddle sales, warns you before you cross this threshold, and gives you the registration checklist. Filing itself is handed to specialist partners.
Comparing tools for the Washington threshold
TaxesRadar vs TaxJarTaxJar files US state returns. Where it stops is the border - see what each one covers, side by side.More on the Washington sales tax threshold
- Whose sale was it? Merchant of record versus marketplace facilitatorA merchant of record sale counts toward no threshold anywhere. A marketplace sale leaves you the seller, and most US states still count it toward your own line.
- US economic nexus: what actually triggers it, state by stateThe $100,000-or-200-transactions rule describes 17 of 48 US jurisdictions. Which test your states really apply, the window they measure over, and what counts.
- EU OSS registration vs US sales tax nexusEU OSS registration and US economic nexus solve the same problem in opposite ways. Here is how each threshold works and what a global seller has to watch.
Other sales tax thresholds
Guidance, not tax advice. Confirm the specifics for your situation with a qualified professional. Threshold shown for 2026; last verified 2026-07-27 against Washington Department of Revenue. Rules change - TaxesRadar keeps them current.