What is the Colorado state income tax rate?

Colorado uses a flat 4.4% rate on federal taxable income for tax year 2024. There are no brackets — every filer pays the same rate. Temporary rate cuts have occasionally lowered it further via TABOR.

What income does Colorado tax?

Colorado starts from your federal taxable income (after your federal standard or itemized deduction), then applies its own additions and subtractions. This calculator uses the federal taxable income figure you enter directly.

What is the TABOR refund?

Colorado's Taxpayer's Bill of Rights (TABOR) caps state revenue growth and refunds the surplus. In recent years this has been distributed as a flat per-filer sales-tax refund (often several hundred dollars), which offsets your income tax.

Does Colorado have local income taxes?

Most Colorado cities have no income tax, though a few (like Denver) charge a small flat Occupational Privilege Tax of about $5.75 per month on certain workers. That head tax is not a percentage income tax and is not modeled here.

Is my income data sent anywhere?

No. The calculation runs entirely in your browser. Nothing you enter is uploaded or stored.

Colorado State Income Tax Calculator

Colorado taxes income at a flat 4.4% of federal taxable income, and the state’s TABOR mechanism refunds surplus revenue back to filers. This free calculator applies the rate and nets your TABOR refund.

How it works

The Colorado tax formula is:

Start from your federal taxable income — line 15 of Form 1040, after your federal deduction. This is the Colorado base, not AGI.
Apply the flat 4.4% rate to that figure.
Subtract your TABOR refund — a flat per-filer surplus refund Colorado pays in many years.

The net of these two is your effective Colorado income-tax burden.

Example

A filer with $55,000 of federal taxable income owes 4.4% × $55,000 = $2,420. With an $800 TABOR refund, the net Colorado tax is $1,620, for an effective rate of about 2.95% on taxable income.

Notes

This estimate covers Colorado state income tax only — not FICA or federal tax. TABOR refund amounts change yearly and depend on the state surplus, so treat the refund as an estimate. Denver’s flat Occupational Privilege Tax is a small monthly head tax, not modeled here.