The formulas
- Tax = 4.4% x Colorado taxable income (federal taxable income with Colorado additions and subtractions)
- Colorado income tax = tax from the rate schedule
How it works
Tax year: 2025. These are the latest full return figures Colorado has published.
Colorado taxes income at a flat 4.4%. Enter Colorado taxable income: the state starts from federal taxable income, so the federal standard deduction is already in it. The tool computes state income tax only; credits other than those named are not applied.
Colorado taxes federal taxable income, adjusted by Colorado additions and subtractions, at one rate. The Department of Revenue lists 4.4 percent for 2025 (4.25 percent applied for 2024 under a temporary reduction). Because the federal standard deduction is already inside federal taxable income, Colorado has no separate standard deduction: enter Colorado taxable income.
Local taxes: Denver, Glendale, Greenwood Village and Sheridan charge a monthly occupational privilege tax on employees; it is a flat monthly amount, not a percentage of income.
Illustrative figures only. Check the result against your firm's methodology before relying on it.
Common questions
What is the Colorado income tax rate for 2025?
Colorado taxes income at a flat 4.4% for 2025. Tax = 4.4% x Colorado taxable income (federal taxable income with Colorado additions and subtractions).
Does Colorado have a standard deduction?
Colorado starts from federal taxable income, so the federal standard deduction is already applied.
Are there local income taxes in Colorado?
Denver, Glendale, Greenwood Village and Sheridan charge a monthly occupational privilege tax on employees; it is a flat monthly amount, not a percentage of income.
Sources
Runs in your browser. The figures you type are not sent to CORAA or stored. Check the result against your firm's methodology before relying on it.