Grand Coulee Sales Tax Calculator
The combined sales tax rate in Grand Coulee, Washington is 8.4% in 2026 — a 6.5% Washington state rate plus 1.9% in local add-ons. That is the 117th lowest rate of the 280 Washington cities we track, and it runs below Washington's 9.47% average. On a $100 purchase that's $8.40 in tax for a $108.40 total.
$100.00 total
Before tax: $100.00 · Sales tax: $0.00 (0%)
State & average combined rates: Tax Foundation 2026. Local rates vary by city/county — adjust the rate for an exact figure. How we calculate →
Grand Coulee sales tax rate in 2026
Grand Coulee charges a combined sales tax rate of 8.4%: the Washington statewide base of 6.5% plus 1.9% in city and county add-ons. Grand Coulee is in Grant County.
That local add-on is set by Grand Coulee and the taxing districts that overlap it, which is why neighboring cities in Washington can charge a different total even a few miles apart.
Grand Coulee vs the rest of Washington
At 8.4%, Grand Coulee runs below Washington's 9.47% statewide average combined rate by 1.07%. Among the 280 Washington cities we track by combined rate, Grand Coulee ranks the 117th lowest.
That makes Grand Coulee comparatively light on sales tax for Washington, though it's still well above zero.
Sales tax examples in Grand Coulee
At Grand Coulee's 8.4% combined rate:
$100 → $8.40 tax, $108.40 total · $1,000 → $84.00 tax, $1,084.00 total · $25,000 car purchase → $2,100 tax, $27,100 total.
Working backwards: a $1,080.00 receipt total in Grand Coulee means the pre-tax price was $996.31 and $83.69 was tax — use “Remove tax” mode above to reverse any total instantly.
A note on Grand Coulee's exact rate
The 8.4% rate applies within Grand Coulee's official city limits as published by Washington DOR — Tax Rate Lookup. Addresses with a Grand Coulee mailing address but outside the incorporated city line — a common situation on the edges of any city — can fall under a different, usually lower, rate.
For an address-exact rate, use the official lookup tool: Washington DOR — Tax Rate Lookup. This calculator pre-fills the published city-limits rate as a reliable starting point.
Grand Coulee sales tax — frequently asked questions
What is the sales tax rate in Grand Coulee, Washington?
Grand Coulee's combined sales tax rate is 8.4% in 2026 — 6.5% Washington state tax plus 1.9% in local add-ons. That's the 117th lowest rate of the 280 Washington cities we track.
How much is sales tax on $100 in Grand Coulee?
At Grand Coulee's 8.4% rate, sales tax on a $100 purchase is $8.40, for a $108.40 total.
How much sales tax will I pay on a $25,000 car in Grand Coulee?
At Grand Coulee's 8.4% combined rate, sales tax on a $25,000 vehicle purchase is about $2,100, for a $27,100 total before any trade-in credit or registration fees.
Is Grand Coulee's sales tax higher or lower than the Washington average?
Grand Coulee runs below Washington's 9.47% statewide average by 1.07%, ranking the 117th lowest of the 280 Washington cities we track.
How do I calculate sales tax backwards from a total in Grand Coulee?
Divide the total by 1 plus the rate. A $1,080.00 total in Grand Coulee works back to a $996.31 pre-tax price and $83.69 of tax. Use “Remove tax” mode above to do this automatically.
Does Grand Coulee's sales tax rate apply everywhere in the Grand Coulee area?
The 8.4% rate applies within Grand Coulee's official city limits. Nearby addresses outside the incorporated boundary can be taxed at a different rate — check Washington DOR — Tax Rate Lookup for an address-exact figure.
Compare nearby cities in Washington
See all 280 Washington cities ranked by combined sales tax rate, or compare:
Researched & verified by the Calcuris Data & Research Team. How we build and check our tools →