Thornton, Colorado Sales Tax Calculator (2026)
7.65% total combined rate — includes state and local taxes.
Thornton’s combined rate of 7.65% includes contributions from Adams County and local city taxes.
Thornton Sales Tax Calculator
Enter a purchase amount — we’ll calculate the total with Thornton’s tax rate.
Rate
7.65%
Tax
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Total
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The current combined rate for Thornton is 7.65%.
Thornton Sales Tax Breakdown
- State Rate: 2.90%
- City Rate: 3.75%
- County Rate: 1.00%
- Special Rate: 0.00%
- Total: 7.65%
About Thornton
Thornton’s sales tax supports new housing, roadway, and public development projects across the fast-growing suburb.