Tax Bracket for Colorado (2026)
Last updated: January 15, 2026
Colorado (CO) Key Facts
Tax Structure
Flat rate
Top Marginal Rate
4.4%
Number of Brackets
1
Tax Year
2,026
How This Calculator Works in Colorado
This calculator shows which Colorado tax bracket your income falls into. Enter your income and filing status to see marginal and effective rates.
Colorado Overview
Colorado levies a flat income tax rate of 4.4% on all taxable income. Unlike progressive states with multiple brackets, every dollar earned in Colorado is taxed at the same rate, making calculations predictable and straightforward.
How Colorado Compares
Colorado's top rate of 4.4% compares to Utah at 4.65% and New Mexico at 5.9%. Comparing effective rates is more meaningful than top rates alone.
| State | Top Rate | Notes |
|---|---|---|
| Utah | 4.65% | Utah has an income tax rate of 4.65%. |
| New Mexico | 5.9% | New Mexico has an income tax rate of 5.9%. |
| Kansas | 5.7% | Kansas has an income tax rate of 5.7%. |
Colorado's income tax rate of 4.4% compares to a national average of approximately 5.04%. This is below the national average.
Tips for Colorado Residents
- 1Colorado uses a flat income tax rate of 4.4%, meaning all taxable income is taxed at the same rate regardless of how much you earn.
- 2With a flat tax, your marginal rate and effective state rate are the same—4.4%.
- 3Federal brackets still apply progressively on top of Colorado's flat 4.4% rate.
- 4Pre-tax retirement contributions reduce both your federal bracket and the income subject to Colorado's flat 4.4%.
- 5Colorado's flat 4.4% is below the national average of about 5%, making withholding calculations straightforward.