Washington Sales Tax Calculator (2026) — Add or Reverse Tax
Washington's combined sales tax rate is 9.51% (6.50% state + 3.01% average local). Use the calculator below to add Washington sales tax to a price, or reverse a tax-included total to find the pre-tax price and exact tax amount.
How to use this calculator:
- Adding tax — enter a pre-tax price, pick "Add tax to price," and the calculator applies the Washington rate to show the tax amount and final total.
- Reversing (extracting) tax — enter a total that already includes tax, pick "Extract tax from total," and the calculator divides by 1 + the rate to isolate the pre-tax price and the exact tax paid.
- Pick the rate that matches your situation: the average combined rate is a good statewide estimate, but the state-only or maximum-local rate is more precise if you know the exact city or county.
Understanding Washington Sales Tax
Washington's state sales tax rate is 6.50%, and local jurisdictions add an average of 3.01% on top, bringing the typical combined rate to 9.51%. Rates vary by city and county — the highest combined rate in Washington can reach 10.60%.
Washington has no state income tax and instead leans on one of the higher average combined sales tax rates in the country to fund state and local government.
Washington has no state income tax, which shapes how much the state relies on sales tax revenue relative to other funding sources.
Groceries
Exempt from Washington state sales tax.
Largest city
Seattle
State income tax
No
Why Reverse Sales Tax Calculation Matters
Receipts, invoices, and marketplace payouts usually show only the tax-included total — not the pre-tax price. Reversing the calculation matters for bookkeeping (separating revenue from tax collected), expense reports (reimbursing only the pre-tax cost), and price comparisons (checking what an item actually costs before Washington's tax is applied). Because dividing by (1 + rate) is not the same as simply subtracting the rate from the total, doing this by hand is a common source of errors — the calculator above handles it exactly.
Washington Taxability at a Glance
🛒 Groceries
Exempt
👕 Clothing
Taxable
💊 Prescription drugs
Exempt
History & Rate Breakdown
Washington's Revenue Act of 1935 created both the retail sales tax and the state's distinctive Business & Occupation (B&O) tax — a gross-receipts-style tax on business activity that exists alongside, not instead of, the sales tax most other states rely on as their primary business tax.
Washington's 9.51% average combined rate stacks the 6.5% state rate with city, county, and special-district taxes averaging 3.01%. Seattle's combined rate reached 10.55% in 2026 after the city and King County each added a new 0.1% tax for local law enforcement programs, while nearby Edmonds and Lynnwood run even higher at 10.7%.
Where the Money Goes
With no state income tax, Washington relies heavily on both its high sales tax and its unique B&O gross-receipts tax on businesses to fund state and local government — a dual-tax structure that's fairly unusual among no-income-tax states.
Business Use Case: Registering & Collecting Washington Sales Tax
A Washington business must track both the sales tax it collects from customers and its own separate B&O tax liability on gross receipts — meaning a Washington retailer effectively manages two distinct state tax obligations that most other states combine into (or replace with) a single sales tax framework.
Sales Tax Terms Glossary
Combined rate
The state sales tax rate plus any applicable local (city, county, or special district) rates — the actual rate charged at checkout in a given location.
Reverse sales tax
The process of working backward from a tax-included total to find the pre-tax price and the exact tax amount, using total ÷ (1 + rate) = pre-tax price.
Economic nexus
A sales threshold (in dollars, transaction count, or both) that obligates an out-of-state seller to collect and remit sales tax even without a physical presence in the state.
Marketplace facilitator
A platform (e.g. Amazon, Etsy, eBay) that collects and remits sales tax on behalf of third-party sellers under most states’ marketplace facilitator laws.
Real-World Example
A $500.00 purchase in Washington at the average combined rate of 9.51%:
- Tax amount: $500.00 × 9.51% = $47.55
- Total price: $500.00 + $47.55 = $547.55
Washington Sales Tax Compliance for Sellers
Remote and online sellers establish economic nexus in Washington once they exceed $100,000.00 in annual sales (no separate transaction-count test). Once nexus is established, a seller must register with the state, collect Washington sales tax at checkout, and file returns on the state's required schedule. Marketplace facilitators (Amazon, Etsy, eBay, Walmart) generally collect and remit on behalf of third-party sellers automatically.
Frequently Asked Questions — Washington Sales Tax
What is the sales tax rate in Washington?▾
Does Washington tax groceries?▾
Does Washington have a state income tax?▾
When do online sellers need to collect Washington sales tax?▾
How do I calculate Washington sales tax on a purchase?▾
How do I reverse Washington sales tax to find the price before tax?▾
What is the formula to back out sales tax from a receipt in Washington?▾
References & Sources
Rates last verified January 2026. Washington sales tax rates and thresholds can change — always confirm current figures with the Washington Department of Revenue before filing or invoicing. This tool is for estimation and educational purposes only and is not tax, legal, or accounting advice.
Jordan Hayes
Verified AuthorLead Content Editor & Personal Finance Specialist
Jordan Hayes is a personal finance content strategist with 9+ years building educational finance and health resources. He has written and fact-checked over 200 personal finance guides covering mortgage amortization, retirement planning, tax strategy, and budgeting. His work applies IRS publications, Federal Reserve data, and peer-reviewed research to make complex calculations accessible.