Colorado State Income Tax Overview
Colorado (CO) state income tax rate: 4.40% flat (flat rate system)
Colorado Income Tax Brackets (2026)
Flat 4.40% on all Colorado taxable income (reduced from 4.55% in 2023 via TABOR refund mechanism)
Colorado uses a flat income tax tied to Colorado taxable income, which starts with federal AGI. The rate can temporarily drop further under TABOR (Taxpayer's Bill of Rights) when state revenues exceed the cap.
Median Household Income in Colorado
The median household income in Colorado is $80,630. Colorado has one of the higher median incomes nationally, driven by the Denver-Boulder tech and energy corridor. The flat 4.40% rate is relatively favorable compared to neighboring states with higher incomes.
How to Use This Calculator for Colorado
- Enter your gross income and filing status
- The calculator applies Colorado's flat income tax rate of up to 4.40% flat
- Subtract your standard deduction and any applicable credits
- Review your estimated state and federal tax liability
Frequently Asked Questions
What is the Colorado state income tax rate?
Colorado has a flat income tax with a top rate of 4.40% flat. Flat 4.40% on all Colorado taxable income (reduced from 4.55% in 2023 via TABOR refund mechanism).
How does Colorado's income tax compare to the national average?
Colorado's top income tax rate of 4.40% flat applies to a flat rate system. Colorado uses a flat income tax tied to Colorado taxable income, which starts with federal AGI. The rate can temporarily drop further under TABOR (Taxpayer's Bill of Rights) when state revenues exceed the cap.
What is the median household income in Colorado?
The median household income in Colorado is $80,630. Colorado has one of the higher median incomes nationally, driven by the Denver-Boulder tech and energy corridor. The flat 4.40% rate is relatively favorable compared to neighboring states with higher incomes.
Is this state income tax calculator free to use for Colorado?
Yes, this state income tax calculator is 100% free with no signup required. It includes Colorado-specific tax rates and calculates your estimated state and federal tax liability instantly.