Colorado Income Tax Rate History
Colorado's top marginal income tax rate fell from 4.55% in 2021 to 4.40% in 2026, a cut of 0.15%. The rate moved 1 time in 6 years.
6 sourced years, 2 of them from Colorado's own revenue department and the rest from Tax Foundation's dated annual editions. Nothing is interpolated. How the two differ.
Colorado against the national median
One marker per sourced year. Lines join the points to show direction; no value between markers is implied.
Year by year
| Year | Top rate | Structure | Change | Basis | Source |
|---|---|---|---|---|---|
| 2021 | 4.55% | flat | — | As of 1 January | Tax Foundationprov. |
| 2022 | 4.55% | flat | — | As of 1 January | Tax Foundationprov. |
| 2023 | 4.40% | flat | −0.15% | As of 1 January | Tax Foundationprov. |
| 2024 | 4.40% | graduated | — | As of 1 January | Tax Foundationprov. |
| 2025 | 4.40% | flat | — | Enacted for the year | Colorado Department of Revenue |
| 2026 | 4.40% | flat | — | Enacted for the year | Colorado Department of Revenue |
Every change
- 2023: cut of 0.15% — 4.55% to 4.40%.
What was behind the changes
Colorado has levied a single flat rate throughout this period. Tax Foundation's 2024 edition lists two distinct rates for Colorado, reflecting the temporary TABOR rate reduction, which is why the 2024 row reads as graduated in the structure column. It was not a change of structure.
What this page does not tell you
This is the top marginal rate, not anyone's bill. Only the rate is carried back; Colorado's brackets, standard deduction and exemptions for years before 2025 are not in this dataset. A cut in the top rate can sit alongside a higher bill for most filers.
Only the top marginal rate is carried back. Brackets, deductions and exemptions for years before 2025 are not in this dataset.
Years before 2025 are Tax Foundation's 1 January snapshot; 2025 and 2026 are the rate enacted for the whole year, from the state's own source. Where the two disagree the record carries both figures.
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