Washington Sales Tax Nexus
Washington Risk Profile
The Trigger: $100,000 in annual Washington-sourced gross receipts.
(Note: Washington repealed its 200-transaction threshold in 2020. It is now a revenue-only state. However, the $100,000 threshold applies to the sum of all income, including marketplace sales.)
Physical Nexus: Standard triggers apply, including offices, employees, and inventory (including FBA). Washington also has a “Commercially Domiciled” rule—if your business is managed or directed from Washington, you have nexus regardless of sales volume.
Effective Date: October 1, 2018.
Look-back Exposure: Standard look-back is 4 years. Washington is one of the most sophisticated states for data-matching and is aggressive in pursuing out-of-state retailers who have inventory in local fulfillment centers.
Danger Level: SEVERE (The B&O Tax Trap)
Washington does not have a state income tax; instead, it imposes a Business & Occupation (B&O) Tax. This is a tax on gross receipts. If you meet the $100,000 nexus threshold, you are liable for B&O tax on every dollar of Washington sales, even if your business is not profitable.
The Trap: No Small Seller Exception for B&O
While marketplaces typically collect and remit the Sales Tax for you, they do NOT pay your B&O tax. Many sellers mistakenly believe they have no filing obligation because a marketplace handles the sales tax, only to be hit later with a massive bill for unpaid B&O taxes, penalties, and interest.
Washington Sales Tax Nexus
Physical Presence Nexus
You have Washington nexus if your business has physical presence in the state. Common examples include employees or representatives in Washington, an office/location, or inventory stored in Washington (including inventory stored with a third party). If you have physical presence nexus, Washington generally requires you to register and comply with Washington tax obligations. (Washington Department of Revenue)
Economic Nexus (Out-of-State Businesses)
If you do not have physical presence nexus, Washington still requires registration if you have more than $100,000 in combined gross receipts sourced or attributed to Washington in the current or prior year. (Washington Department of Revenue)
What Nexus Usually Means in Washington
If you meet Washington’s nexus/threshold rules, you generally must:
- Register with the Washington Department of Revenue
- Collect and remit retail sales tax on taxable Washington sales (when you are the party responsible for collection)
- Report Washington business taxes such as B&O tax, depending on your activity (Washington Department of Revenue)
Nexus Thresholds Summary for Out-of-State Businesses
A business must register to report B&O tax and collect/submit applicable sales tax if, in the current or prior year, it:
- Has physical presence nexus in Washington, or
- Has more than $100,000 in WA-sourced/attributed combined gross receipts, or
- Is organized or commercially domiciled in Washington (Washington Department of Revenue)
Conclusion
Washington nexus can be created by physical presence or by exceeding the $100,000 WA gross receipts threshold (current or prior year). If you are close to the threshold or have inventory/people in the state, it’s worth confirming your facts before you file or register. (Washington Department of Revenue)
If you want to add the official WA links at the bottom of the page, here they are (safe to paste):
https://dor.wa.gov/education/industry-guides/out-state-businesses-reporting-thresholds-and-nexus
https://dor.wa.gov/taxes-rates/sales-use-tax-rates/local-sales-use-tax
https://dor.wa.gov/taxes-rates/sales-use-tax-rates/local-sales-use-tax/local-sales-use-tax-rate-table
If you want, I can also rewrite the meta title + meta description and add a short FAQ section that matches how people search this (for SEO), but the core legal content above is the important fix.
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