Washington economic nexus threshold
| Threshold | $100,000.00 |
|---|---|
| How the tests combine | the dollar test is the only test |
| Measured over | the previous or the current calendar year, whichever triggers first |
| Sales basis | gross sales, before any deduction |
| Do marketplace sales count toward it | yes |
| In force since | 2023-01-01 |
| Rule last verified | 2026-07-31 |
Marketplace sales DO count toward the threshold
When Amazon, Etsy, eBay or Walmart collects and remits the tax on a sale shipped to Washington, that sale still counts toward the seller's own registration threshold here.
The tax got paid. The sale still counts. That is why a seller can be over the Washington line while their Shopify admin alone shows them comfortably under it, and it is the column most published threshold charts leave out.
What "measured over" is doing
A threshold is a number and a period, and the period is the part most charts omit. Washington measures over the previous or the current calendar year, whichever triggers first. Two sellers with identical annual sales can sit on opposite sides of this line because their sales fall differently inside that window.
Source
Sales Tax Institute, Economic Nexus State Guide (chart dated 2026-05-04)
https://www.salestaxinstitute.com/resources/economic-nexus-state-guide
Last verified 2026-07-31. StateWise publishes the verification date beside every rule because a threshold with no date on it is a claim a reader cannot evaluate.
What this page does not tell you
- Whether what you sell is taxable in Washington.
- Anything about home-rule local taxes, which are outside this tool.
- What happens to an obligation after sales fall back below a threshold.
- Any deadline. Crossing a threshold is the point at which a state expects a seller to look into registering, and that decision has lasting consequences in both directions.
Related: the full jurisdiction table, how StateWise counts your sales, and what StateWise reads, and what it ignores.