Colorado Income Tax Calculator (2026 Filing Season)
Colorado has a flat 4.4% state income tax for the 2025 tax year.
Flat 4.4% on federal taxable income; TABOR surpluses have triggered temporary rate reductions in some years.
We subtract Colorado's standard deduction ($15,000) automatically.
The same $75,000 income in a no-income-tax state (Texas, Florida, Tennessee…) would owe $0 in state income tax — a difference of $2,640 per year.
We only store your state and filing status — never your income.
Colorado 2025 Tax Brackets
Single
| Taxable income over | Rate |
|---|---|
| $0 | 4.4% |
Married filing jointly
| Taxable income over | Rate |
|---|---|
| $0 | 4.4% |
Standard deduction: $15,000 (single) / $30,000 (married filing jointly) — subtracted automatically in the estimator above.
File your CO return
These handle both your federal and Colorado state return.
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Our complete Colorado tax guide covers sales tax, property tax, deadlines, and key deductions.
Educational estimate only — excludes credits, itemized deductions, and local income taxes except where noted. 2025 tax-year data, verified 2026-06. Not tax advice; confirm with the Colorado revenue department or a tax professional before filing.