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 and marketplace payouts usually show only the tax-included total, so separating revenue from tax collected — for bookkeeping, expense reports, or checking what an item costs before Washington's tax is applied — means working backward from that total. Dividing by (1 + rate) isn't the same as subtracting the rate, which is why the calculator above handles it exactly.
Washington Taxability at a Glance
🛒 Groceries
Exempt
👕 Clothing
Taxable
💊 Prescription drugs
Exempt
How Washington Fits Into the US Sales Tax System
The United States has no federal sales tax — unlike VAT/GST countries where a national rate applies everywhere, US sales tax is set entirely at the state level, and each of the 50 states (plus DC) independently decides whether to levy one, what the rate is, and what's exempt. Washington is one of the 45 states (plus DC) that levies a general sales tax. States can also authorize cities, counties, and special districts to add their own local rate on top of the state rate — which is why the "combined rate" shown on this page is a blend, not a single fixed number, and why it can differ from the state rate alone by several percentage points depending on the exact delivery address.
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.
Key terms: combined rate — state rate plus applicable local add-ons; reverse sales tax — working backward from a tax-included total via total ÷ (1 + rate); economic nexus — a sales threshold that obligates an out-of-state seller to collect tax without a physical presence; marketplace facilitator — a platform that remits tax on behalf of third-party sellers.
Real-World Example: Adding Tax to a Price
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
Real-World Example: Extracting Tax From a Receipt Total
A receipt shows a $749.99 tax-included total in Washington at the average combined rate of 9.51%:
- Pre-tax price: $749.99 ÷ (1 + 9.51%) = $684.86
- Tax amount: $749.99 − $684.86 = $65.13
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
Methodology: the combined rate shown is the state rate plus the population-weighted average of local (city/county/district) rates reported by the Tax Foundation for 2026; it is an average, not the exact rate for any single address — use the county table above where available, or confirm the exact local add-on with the Washington Department of Revenue, for a specific delivery address. Economic nexus thresholds are sourced from the Sales Tax Institute's Economic Nexus State Guide.
Rates last verified January 2026. Washington sales tax rates and thresholds change over time — 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 AuthorPersonal Finance Content Strategist
Jordan is a personal finance content strategist with 9+ years writing about mortgages, retirement, tax strategy, and budgeting. Every guide is cross-referenced with IRS publications, Federal Reserve data, and CFPB guidance to make complex calculations accessible. Editor at CalculatorApp.me.
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Tax-rate data, review & limitations
Jurisdiction: Washington, United States. Effective date: January 1, 2026. Reviewed by CalculatorApp.me editorial staff on July 26, 2026; next scheduled review: October 26, 2026.
Rates are reference estimates, not tax advice. Local rules, exemptions, filing status, and effective dates can change the amount due.
Primary sources
- Tax Foundation, 2026 State and Local Sales Tax Rates
- Relevant state department of revenue guidance