State Income Tax
Colorado imposes a state income tax using a flat rate of 4.4% on all taxable income regardless of income level. The filing deadline is 2026-04-15. Social Security benefits are exempt from Colorado state income tax. Retirement income is generally taxable. Social Security fully deductible for 65+; pension exclusion of $20k (55-64) or $24k (65+).
Retirement Income Details
Social Security fully deductible for 65+; pension exclusion of $20k (55-64) or $24k (65+).
Does Colorado have a state income tax?
Yes. Colorado has a state income tax with a flat rate of 4.4%.
What is the Colorado income tax rate?
Colorado uses a flat tax rate of 4.4% on all taxable income. This means all taxpayers pay the same rate regardless of how much they earn.
Is Social Security taxed in Colorado?
No. Colorado does not tax Social Security benefits, which can be significant for retirees living on fixed incomes.
Is retirement income taxed in Colorado?
Yes. Colorado generally taxes retirement income. Social Security fully deductible for 65+; pension exclusion of $20k (55-64) or $24k (65+).
When is the Colorado income tax filing deadline?
The Colorado state income tax filing deadline is 2026-04-15. You can file and pay through the official Colorado Department of Revenue portal.
What is the standard deduction in Colorado?
Colorado's standard deduction is $15,000 for single filers and $30,000 for married filing jointly.
How does Colorado income tax compare to neighboring states?
Colorado's top rate of 4.4% is in the moderate range nationally. Use the comparison table above to see how neighboring states compare.
Official Payment Portal
Colorado Department of Revenue
Last verified: 2026-03-31 · Always consult a tax professional before making financial decisions.