Boulder Sales Tax Calculator
The combined sales tax rate in Boulder, Colorado is 9.195% in 2026 — a 2.9% Colorado state rate plus 6.295% in local add-ons. That is the 4th highest rate of the 41 Colorado cities we track, and it runs above Colorado's 7.86% average. On a $100 purchase that's $9.19 in tax for a $109.20 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 →
Boulder sales tax rate in 2026
Boulder charges a combined sales tax rate of 9.195%: the Colorado statewide base of 2.9% plus 6.295% in city and county add-ons. Boulder is in Boulder County. Boulder administers its own sales tax (home-rule); the combined rate shown is published by the Colorado Department of Revenue for information.
That local add-on is set by Boulder and the taxing districts that overlap it, which is why neighboring cities in Colorado can charge a different total even a few miles apart.
Boulder vs the rest of Colorado
At 9.195%, Boulder runs above Colorado's 7.86% statewide average combined rate by 1.335%. Among the 41 Colorado cities we track by combined rate, Boulder ranks the 4th highest.
That puts Boulder on the higher end for Colorado — worth double-checking against the official lookup tool if you're quoting a price to a customer or filing a return.
Sales tax examples in Boulder
At Boulder's 9.195% combined rate:
$100 → $9.19 tax, $109.20 total · $1,000 → $91.95 tax, $1,091.95 total · $25,000 car purchase → $2,299 tax, $27,299 total.
Working backwards: a $1,090.00 receipt total in Boulder means the pre-tax price was $998.21 and $91.79 was tax — use “Remove tax” mode above to reverse any total instantly.
A note on Boulder's exact rate
The 9.195% rate applies within Boulder's official city limits as published by Colorado DOR — Sales & Use Tax Rate Lookup (DR 1002). Addresses with a Boulder 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: Colorado DOR — Sales & Use Tax Rate Lookup (DR 1002). This calculator pre-fills the published city-limits rate as a reliable starting point.
Boulder sales tax — frequently asked questions
What is the sales tax rate in Boulder, Colorado?
Boulder's combined sales tax rate is 9.195% in 2026 — 2.9% Colorado state tax plus 6.295% in local add-ons. That's the 4th highest rate of the 41 Colorado cities we track.
How much is sales tax on $100 in Boulder?
At Boulder's 9.195% rate, sales tax on a $100 purchase is $9.19, for a $109.20 total.
How much sales tax will I pay on a $25,000 car in Boulder?
At Boulder's 9.195% combined rate, sales tax on a $25,000 vehicle purchase is about $2,299, for a $27,299 total before any trade-in credit or registration fees.
Is Boulder's sales tax higher or lower than the Colorado average?
Boulder runs above Colorado's 7.86% statewide average by 1.335%, ranking the 4th highest of the 41 Colorado cities we track.
How do I calculate sales tax backwards from a total in Boulder?
Divide the total by 1 plus the rate. A $1,090.00 total in Boulder works back to a $998.21 pre-tax price and $91.79 of tax. Use “Remove tax” mode above to do this automatically.
Does Boulder's sales tax rate apply everywhere in the Boulder area?
The 9.195% rate applies within Boulder's official city limits. Nearby addresses outside the incorporated boundary can be taxed at a different rate — check Colorado DOR — Sales & Use Tax Rate Lookup (DR 1002) for an address-exact figure.
Compare nearby cities in Colorado
See all 41 Colorado cities ranked by combined sales tax rate, or compare:
Researched & verified by the Calcuris Data & Research Team. How we build and check our tools →