Boulder, Colorado Sales Tax Calculator 2026
2026Calculate sales tax in Boulder, CO. The total sales tax rate is 7.945% (2.9% state + 3.86% city + 1.185% county). Free 2026 calculator.
Total Tax
$9.25
Total with Tax
$109.25
Combined Rate
9.250%
Tax Breakdown
| State Tax (7.25%) | $7.25 |
| Local Tax (2.00%) | $2.00 |
| Total Sales Tax | $9.25 |
| Total with Tax | $109.25 |
Disclaimer: This calculator is for informational purposes only and does not constitute tax, financial, or legal advice. Results are estimates based on the information you provide and current rates. Always consult a qualified tax professional or financial advisor for advice specific to your situation.
Boulder, CO Sales Tax Rate Breakdown
State Rate
2.9%
Colorado
City Rate
3.86%
Boulder
County Rate
1.185%
County/District
Total Rate
7.945%
Combined
Sales Tax in Boulder, Colorado
When you make a purchase in Boulder, Colorado, you pay a combined sales tax rate of 7.945%. This is made up of the Colorado state sales tax of 2.9%, plus the Boulder city sales tax of 3.86% , and an additional county/district tax of 1.185%.
Colorado has one of the most complex local sales tax systems in the country. Unlike most states, Colorado allows "home rule" cities to self-administer their own sales taxes, which means businesses may need to register and file separately with each city. The state rate of 2.9% is among the lowest in the nation, but local add-ons can push combined rates above 10% in some areas.
For a $100 purchase in Boulder, you would pay $7.95 in sales tax, for a total of $107.94. For a $1,000 purchase, the sales tax would be $79.45.
Sales Tax on Common Purchase Amounts in Boulder
| Purchase Price | Sales Tax | Total Price |
|---|---|---|
| $25 | $1.99 | $26.99 |
| $50 | $3.97 | $53.97 |
| $100 | $7.95 | $107.94 |
| $250 | $19.86 | $269.86 |
| $500 | $39.73 | $539.73 |
| $1,000 | $79.45 | $1079.45 |
| $5,000 | $397.25 | $5397.25 |
Sales Tax Rates in Other Colorado Cities
| City | State Rate | Local Rate | Total Rate |
|---|---|---|---|
| Boulder | 2.9% | 5.04% | 7.945% |
| Denver | 2.9% | 5.81% | 8.71% |
| Castle Rock | 2.9% | 5.00% | 7.9% |
| Commerce City | 2.9% | 4.99% | 7.885% |
| Aurora | 2.9% | 4.85% | 7.75% |
| Westminster | 2.9% | 4.83% | 7.735% |
| Thornton | 2.9% | 4.74% | 7.635% |
| Longmont | 2.9% | 4.71% | 7.615% |
| Fort Collins | 2.9% | 4.65% | 7.55% |
| Pueblo | 2.9% | 4.50% | 7.4% |
| Arvada | 2.9% | 4.46% | 7.36% |
| Colorado Springs | 2.9% | 4.35% | 7.25% |
| Broomfield | 2.9% | 4.15% | 7.05% |
| Lakewood | 2.9% | 4.00% | 6.9% |
| Greeley | 2.9% | 3.46% | 6.36% |
Average combined sales tax rate across Colorado cities shown: 7.54%