Reference data as of August 2026. Rates, thresholds, and agency names change — verify anything time-sensitive against the current authority before relying on it. We name agencies but do not link to third-party sites.
- Sales tax administered by
- Washington Department of Revenue
- Statewide base rate
- 6.5% — local rates stack on top and are generally sourced to the delivery address.
- Economic nexus (remote sellers)
- $100,000 in sales
- Filing cadence
- Monthly, quarterly, or annually by liability
- Employer / payroll registration
- Washington Employment Security Department
- Entity registration
- Washington Secretary of State
- What trips people up
- No income tax, but the Business and Occupation tax applies to gross receipts by activity classification and is reported alongside sales tax.
- Other business tax
- Business and Occupation (B&O) Tax — levied on gross receipts, with no deduction for cost of goods, labor, or any other expense, payable by the business. This is a separate filing from sales tax, with its own registration and its own calendar.
Washington's Business and Occupation (B&O) Tax
the rate depends on the activity classification — retailing, wholesaling, service, manufacturing — and a business doing more than one reports under more than one. It is filed alongside sales tax on the same return.
Because it is calculated on revenue rather than on profit, a business here can owe it in a year it lost money. The accounting consequence is specific: because there is no deduction for costs, a business with thin margins pays B&O in years it loses money. Revenue has to be split by activity classification in the books, or the return is guesswork. That is a decision for whoever keeps the practice's accounts to make early rather than discover at filing time. It does not change how a claim is billed.
What this means for a Washington practice
Clinical services billed to a payer are generally not subject to Washington sales tax, so for most practices this matters only on the retail side: supplements, cosmetics, optical, or equipment sold rather than billed. Those sales are filed with the Washington Department of Revenue on the schedule it assigns, and your accountant owns that filing.
None of this is a service we sell, and none of it is advice — it is reference, kept because a practice is still a business with a state footprint and the question comes up. See how Medicaid billing works in Washington or browse everything for Washington.
White Glove Medical Billing is a medical billing, coding, and revenue cycle company — not a healthcare provider and not a law firm. All coding is performed by certified coders from your providers' documentation; the clinical record and the certification of medical necessity remain the provider's. Coverage determinations, claim adjudication, payment amounts, and appeal outcomes are decided solely by the applicable payer, plan, or government program. Rules, fee schedules, and timely-filing limits change and vary by payer and by state; collections, reimbursement, turnaround times, and appeal results are not guaranteed and will differ by practice.
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