Index Sales Tax Calculator
The combined sales tax rate in Index, Washington is 9.1% in 2026 — a 6.5% Washington state rate plus 2.6% in local add-ons. That is the 81st highest rate of the 280 Washington cities we track, and it runs below Washington's 9.47% average. On a $100 purchase that's $9.10 in tax for a $109.10 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 →
Index sales tax rate in 2026
Index charges a combined sales tax rate of 9.1%: the Washington statewide base of 6.5% plus 2.6% in city and county add-ons. Index is in Snohomish County.
That local add-on is set by Index and the taxing districts that overlap it, which is why neighboring cities in Washington can charge a different total even a few miles apart.
Index vs the rest of Washington
At 9.1%, Index runs below Washington's 9.47% statewide average combined rate by 0.37%. Among the 280 Washington cities we track by combined rate, Index ranks the 81st highest.
That makes Index comparatively light on sales tax for Washington, though it's still well above zero.
Sales tax examples in Index
At Index's 9.1% combined rate:
$100 → $9.10 tax, $109.10 total · $1,000 → $91.00 tax, $1,091.00 total · $25,000 car purchase → $2,275 tax, $27,275 total.
Working backwards: a $1,090.00 receipt total in Index means the pre-tax price was $999.08 and $90.92 was tax — use “Remove tax” mode above to reverse any total instantly.
A note on Index's exact rate
The 9.1% rate applies within Index's official city limits as published by Washington DOR — Tax Rate Lookup. Addresses with a Index 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.
Index sales tax — frequently asked questions
What is the sales tax rate in Index, Washington?
Index's combined sales tax rate is 9.1% in 2026 — 6.5% Washington state tax plus 2.6% in local add-ons. That's the 81st highest rate of the 280 Washington cities we track.
How much is sales tax on $100 in Index?
At Index's 9.1% rate, sales tax on a $100 purchase is $9.10, for a $109.10 total.
How much sales tax will I pay on a $25,000 car in Index?
At Index's 9.1% combined rate, sales tax on a $25,000 vehicle purchase is about $2,275, for a $27,275 total before any trade-in credit or registration fees.
Is Index's sales tax higher or lower than the Washington average?
Index runs below Washington's 9.47% statewide average by 0.37%, ranking the 81st highest of the 280 Washington cities we track.
How do I calculate sales tax backwards from a total in Index?
Divide the total by 1 plus the rate. A $1,090.00 total in Index works back to a $999.08 pre-tax price and $90.92 of tax. Use “Remove tax” mode above to do this automatically.
Does Index's sales tax rate apply everywhere in the Index area?
The 9.1% rate applies within Index'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 →