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Colorado Income Tax Calculator

Estimate your 2026 combined federal and Colorado income tax — Colorado adds a flat 4.4% state income tax.

InputsTY-2026
$
$
$
Federal + state tax16.9% effective
$16,862/yr
10% on $12,400$1,240
12% on $38,000$4,560
22% on $33,500$7,370
federal tax subtotal$13,170
CO state tax$3,692
taxable income
$83,900
marginal rate
22.0%
after tax
$83,138

A single filer earning Colorado's median household income of $106,500 owes about $3,978 in Colorado state income tax — an effective state rate of 3.73%. That is state tax only, on top of federal income tax and FICA.

Based on 2026 Colorado rules and 2026 federal rules, with the standard deduction and no other adjustments. Median income is the 2024 Census figure.

Income tax in Colorado

Colorado taxes income at a flat 4.4% for tax year 2025, applied to federal taxable income — so the federal standard deduction is already built into the base before the state rate applies. The rate was temporarily cut to 4.25% for 2024 under the TABOR surplus mechanism, but the 2025 surplus fell just under the trigger, so the full 4.4% statutory rate applies for 2025.

Colorado income tax structure (2026)

Colorado taxes income at a flat 4.4% after a standard deduction of $16,100 (single). Every taxable dollar is taxed at the same rate, so your marginal and effective state rates converge as income rises.

Common questions

What is Colorado's income tax rate?
Colorado taxes income at a flat 4.4% for tax year 2026 — one rate at every income level, with no brackets — applied after a $16,100 standard deduction ($32,200 joint).
What is the tax bill on $106,500 in Colorado?
A single filer on Colorado's $106,500 median household income (2024) owes about $3,978 to Colorado and $14,600 to the IRS — roughly $18,578 of income tax in total, or 17.4% of gross income.
How much income is exempt from Colorado tax?
The standard deduction shields the first $16,100 of income for a single filer and $32,200 on a joint return, so earnings below that owe no Colorado income tax. Every dollar above it is taxed at the same 4.4%, saving a single filer about $708 versus no deduction at all.

How we calculate this

Federal brackets per our income-tax methodology, plus Colorado's 2026 state tax. Estimates only — not tax advice.

Tax Foundation: State Individual Income Tax Rates and Brackets, 2026 →Colorado Dept. of Revenue — Individual Income Tax →

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Estimates for general informational purposes only; not tax advice. Colorado figures are simplified (credits, local taxes, and AGI adjustments vary) and should be verified with the state Department of Revenue. This estimate does not model Colorado FAMLI paid-leave premiums. Colorado's flat 4.4% is applied with the $16,100 standard deduction for a single filer — not itemized deductions or any Colorado tax credit.