Washington Sales Tax Calculator (9.47% Combined Rate)
Washington has no state income tax, so the 6.5% state sales tax (plus aggressive local add-ons) does most of the revenue work. Seattle/King County is around 10.3% — one of the highest combined rates in the U.S. — driven by transit and regional-services taxes. The Tax Foundation pegs Washington's combined state+local rate at 9.47% for 2026 — that's what this calculator applies to your purchase amount. Estimated using the combined state + average local rate; actual rate depends on your exact location (city/ZIP).
Adjust the inputs and select Calculate for a full breakdown.
Compare Common Scenarios
How the numbers shift across typical situations for this calculator:
| Scenario | Sales tax | Total (purchase + tax) |
|---|---|---|
| $100 purchase (9.47%) | $9.47 | $109.47 |
| $500 purchase (9.47%) | $47.35 | $547.35 |
| $1,500 purchase (9.47%) | $142.05 | $1,642.05 |
How This Calculator Works
Washington's destination-based sourcing means a Bellevue retailer shipping a couch to Spokane must collect Spokane's combined rate, not Bellevue's. The state's Department of Revenue maintains a free ZIP-to-rate lookup tool used heavily by small sellers without enterprise tax software. Washington also famously runs a Business & Occupation (B&O) tax that sits beside sales tax — sellers pay both, with B&O applied to gross receipts and sales tax passed to the buyer. The 6.5% Washington statutory portion plus local layers reach 9.47% on the Tax Foundation's 2026 combined-rate map. Enter the pre-tax amount; the page returns Washington sales tax and total. At a Seattle and King County (~10.3%) register the actual rate runs higher; in rural Eastern Washington closer to 6.5%. Washington exempts groceries (unprepared food) and prescription drugs. Clothing is fully taxable. Several professional services are subject to a separate Business & Occupation tax rather than sales tax. The state also runs use-tax compliance on motor vehicles registered after out-of-state purchase.
The Formula
Percentage Add-On
Rate is the tax or tip percentage applied to the amount
Worked Example
$100 spent in Washington at the 9.47% combined rate adds $9.47 tax, for a total of $109.47. Washington's destination-based sourcing means a Bellevue retailer shipping a couch to Spokane must collect Spokane's combined rate, not Bellevue's. The state's Department of Revenue maintains a free ZIP-to-rate lookup tool used heavily by small sellers without enterprise tax software. Washington also famously runs a Business & Occupation (B&O) tax that sits beside sales tax — sellers pay both, with B&O applied to gross receipts and sales tax passed to the buyer. Washington has no state income tax, so the 6.5% state sales tax (plus aggressive local add-ons) does most of the revenue work. Seattle/King County is around 10.3% — one of the highest combined rates in the U.S. — driven by transit and regional-services taxes. Washington has destination-based sourcing — sellers collect the rate at the BUYER's address, not the store's. Combined with the lack of an income tax, this makes Washington one of the more sales-tax-revenue-dependent states.
Key Insight
Washington has destination-based sourcing — sellers collect the rate at the BUYER's address, not the store's. Combined with the lack of an income tax, this makes Washington one of the more sales-tax-revenue-dependent states. The 6.5% Washington state rate gets layered with local jurisdictions to reach the 9.47% Tax Foundation combined figure — useful as a ballpark for Washington shoppers and a sanity check for Washington-bound sellers, but a multi-jurisdiction online retailer with Washington nexus needs the destination-specific rate per ZIP (via Avalara, TaxJar, Stripe Tax). Washington exempts groceries (unprepared food) and prescription drugs. Clothing is fully taxable. Several professional services are subject to a separate Business & Occupation tax rather than sales tax. The state also runs use-tax compliance on motor vehicles registered after out-of-state purchase.
Why the 'combined' rate matters
U.S. sales tax is layered: a state statutory rate plus local add-ons (county, city, special districts). For Washington, the Tax Foundation publishes a single 'combined' figure by population-weighting all local rates — 9.47% as of January 2026.
This number is useful as a ballpark for consumer-side checkout estimation and statewide comparison, but it is NOT the rate you'd see at a specific store. Two stores in the same state, five miles apart, can have different combined rates because of district-level add-ons.
Wayfair (2018) and the destination-based rate
Before 2018, online sellers only collected sales tax in states where they had physical presence. South Dakota v. Wayfair changed that: a seller exceeding economic-nexus thresholds (typically $100k in sales or 200 transactions per state per year) must collect destination-based sales tax on shipments to that state.
Practical consequence for Washington: if you buy online from an out-of-state seller above the nexus threshold, they should charge YOUR Washington combined local rate, not theirs. If you're a seller, sales-tax automation (Avalara, TaxJar, Stripe Tax) handles the per-customer destination lookup.
Frequently Asked Questions
What is the Washington sales tax rate?
The combined state + average local rate for Washington is 9.47% in 2026 (Tax Foundation). Washington has no state income tax, so the 6.5% state sales tax (plus aggressive local add-ons) does most of the revenue work. Seattle/King County is around 10.3% — one of the highest combined rates in the U.S. — driven by transit and regional-services taxes.
Why does this differ from the rate I paid at checkout in Washington?
Because this is a Washington-statewide population-weighted average. Your actual rate is the 6.5% state portion plus your specific Washington city, county, and special-district add-ons. Seattle and King County (~10.3%) typically runs above the state average; rural Eastern Washington below. For exact-rate compliance, use the Washington Department of Revenue's destination-based rate lookup.
Are groceries, prescriptions, or clothing taxed in Washington?
Washington exempts groceries (unprepared food) and prescription drugs. Clothing is fully taxable. Several professional services are subject to a separate Business & Occupation tax rather than sales tax. The state also runs use-tax compliance on motor vehicles registered after out-of-state purchase.
What about online purchases shipped to me in Washington?
Under South Dakota v. Wayfair (2018), sellers above an economic-nexus threshold must collect destination-based sales tax. If you're in Washington, an out-of-state seller above the threshold applies your Washington combined local rate at checkout, not their home-state rate. Washington has destination-based sourcing — sellers collect the rate at the BUYER's address, not the store's. Combined with the lack of an income tax, this makes Washington one of the more sales-tax-revenue-dependent states.
Does Washington have a use tax on out-of-state purchases?
Washington has destination-based sourcing — sellers collect the rate at the BUYER's address, not the store's. Combined with the lack of an income tax, this makes Washington one of the more sales-tax-revenue-dependent states.
When is this Washington calculator unreliable?
When the actual Washington transaction's local rate differs materially from the state population-weighted average — common in Seattle and King County (~10.3%) where district add-ons push the rate higher, or in rural Eastern Washington where it's lower. Also unreliable for Washington category exemptions (this calculator uses the general retail rate, not reduced/exempt category rates) and for cross-border online sales where the destination's rate applies. For compliance-grade Washington calculation, use a sales-tax automation tool (Avalara, TaxJar, Stripe Tax) or the Washington DOR's destination lookup.
References & Authoritative Sources
- Tax Foundation — State and Local Sales Tax Rates, 2026 · consulted January 1, 2026 · Combined state + population-weighted average local rate as of January 1 2026. Source dataset behind the calculator's default rate.
- U.S. Government Accountability Office — Sales Taxes: Economic Considerations and Recent Trends · consulted June 1, 2026 · Federal-level reference on the economic incidence and post-Wayfair compliance landscape of state sales taxes.
- Washington Department of Revenue — Washington Sales and Use Tax — Rate Lookup · consulted June 1, 2026 · State Department of Revenue is the authority for the exact destination-based rate; this calculator is an estimate.
Related Calculators
Data Sources & Benchmarks
This calculator draws on 1 independent, dated source. The starting values for washington combined sales-tax rate are taken from the benchmarks below and refresh whenever the snapshots are updated.
Methodology & Review
Washington sales-tax estimator using the Tax Foundation's 2026 combined state+local figure of 9.47%. Washington's destination-based sourcing means a Bellevue retailer shipping a couch to Spokane must collect Spokane's combined rate, not Bellevue's. The state's Department of Revenue maintains a free ZIP-to-rate lookup tool used heavily by small sellers without enterprise tax software. Washington also famously runs a Business & Occupation (B&O) tax that sits beside sales tax — sellers pay both, with B&O applied to gross receipts and sales tax passed to the buyer. Washington has no state income tax, so the 6.5% state sales tax (plus aggressive local add-ons) does most of the revenue work. Seattle/King County is around 10.3% — one of the highest combined rates in the U.S. — driven by transit and regional-services taxes. The calculator multiplies the purchase by the combined rate to return tax dollars and total. Washington exempts groceries (unprepared food) and prescription drugs. Clothing is fully taxable. Several professional services are subject to a separate Business & Occupation tax rather than sales tax. The state also runs use-tax compliance on motor vehicles registered after out-of-state purchase. RELIABILITY: Reliable as a Washington-average for ballpark estimation and consumer-side checkout. Less reliable for (a) exact destination-based rates where Seattle and King County (~10.3%) runs above the state average and rural Eastern Washington runs below; (b) reduced-rate or exempt categories under Washington rules; (c) cross-border online sales where Wayfair (2018) redirects to the destination rate. For compliance-grade calculation, use the Washington Department of Revenue's ZIP-based lookup or a tax-automation platform (Avalara, TaxJar, Stripe Tax).
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