Colorado income tax
COColorado uses a flat income tax structure with 1 bracket and a top marginal rate of 4.40%.
- Top marginal rate
- 4.40%
- Brackets
- 1
- Structure
- Flat — single bracket
- Last legislated change
- 2024
Source: https://tax.colorado.gov/. Last reconciled 2026-05-03.
Coming in v0.2
Full Colorado income tax calculator
We're building per-state take-home calculators that account for every bracket, deduction, and local levy. For v0.1 we're shipping the top-marginal summary and source link only. Honest: we'd rather ship one polished mortgage calculator and an accurate state tax index than fake calculators for all 50 states.