Colorado Income Tax Calculator 2026 โ Flat 4.40% Rate
Calculate your 2026 Colorado state income tax at the flat 4.40% rate. See combined federal + CO tax, effective rates, and available Colorado tax credits.
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= $7,083 / month Common salaries:
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Colorado State Tax
$0
Federal Income Tax
0%
CO Effective Rate
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After All Tax Income
Tax Computation Summary
How to Use This Colorado Income Tax Calculator
Enter your annual gross income and select your filing status. The calculator applies Colorado's standard deduction (which mirrors the federal standard deduction) and computes state tax at the flat 4.40% rate. Federal income tax is shown alongside for a complete picture.
The Formula
CO Standard Deduction = $14,600 (single) / $29,200 (married jointly) [2026]
CO Taxable Income = Federal AGI โ CO Standard Deduction (or itemized)
Colorado State Tax = CO Taxable Income ร 4.40%
Combined Effective Rate = (Federal Tax + CO Tax) รท Gross Income ร 100
CO Taxable Income = Federal AGI โ CO Standard Deduction (or itemized)
Colorado State Tax = CO Taxable Income ร 4.40%
Combined Effective Rate = (Federal Tax + CO Tax) รท Gross Income ร 100
Example
Alex, Single, $80,000 salary in Colorado 2026:
CO taxable income: $80,000 โ $14,600 = $65,400
Colorado state tax: $65,400 ร 4.40% = $2,878
Federal taxable: $80,000 โ $15,000 = $65,000
Federal income tax: ~$9,420 (12โ22% brackets)
CO effective rate: 3.60% | Combined effective rate: ~15.4%
CO taxable income: $80,000 โ $14,600 = $65,400
Colorado state tax: $65,400 ร 4.40% = $2,878
Federal taxable: $80,000 โ $15,000 = $65,000
Federal income tax: ~$9,420 (12โ22% brackets)
CO effective rate: 3.60% | Combined effective rate: ~15.4%
Extended
Colorado Tax Credits & Combined Burden
Calculate CO childcare credit, EITC match, and total federal + state tax burden
Enter your federal tax credit amounts to calculate Colorado's matching credits.
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CO credit = 25% of your federal amount $
CO EITC = 25% of federal EITC | Colorado Credit | Your Federal Amount | CO Credit (25%) | Notes |
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Your complete tax burden as a Colorado resident.
| Tax Component | Amount | % of Gross |
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Frequently Asked Questions
What is the Colorado income tax rate for 2026?
Colorado uses a flat income tax rate of 4.40% on all taxable income for 2026. This applies to all filing statuses โ single, married filing jointly, married filing separately, and head of household. The rate has been 4.40% since 2022, down from the prior rate of 4.55%. Colorado voters have repeatedly rejected attempts to change to a progressive system.
How is Colorado taxable income calculated?
Colorado taxable income starts from your federal adjusted gross income (AGI) and then applies the Colorado standard deduction. For 2026, the Colorado standard deduction matches the federal standard deduction: $14,600 for single filers and $29,200 for married filing jointly. Some subtractions apply, such as Social Security income exemptions for certain earners.
What is the Colorado childcare tax credit?
Colorado offers a refundable childcare credit equal to 25% of the federal Child and Dependent Care Credit you claimed. If you claimed $1,000 federal childcare credit, you receive an additional $250 Colorado credit. The credit helps offset qualifying childcare expenses for children under 13.
Does Colorado tax Social Security benefits?
Colorado partially taxes Social Security. Taxpayers under 65 can subtract up to $20,000 of Social Security income from Colorado taxable income. Taxpayers 65 and older can deduct all Social Security income. Full deduction for all retirement income including pensions and IRAs applies to those 65+.
Is Colorado a good state for taxes compared to neighbors?
Colorado's flat 4.40% rate is moderate โ lower than Minnesota (up to 9.85%), higher than Wyoming (0%), and competitive with Utah (4.55%). Colorado has no estate tax and relatively modest property taxes. The flat rate benefits high earners compared to progressive states. The Denver metro area has higher sales taxes (around 8.81% combined) but no city income tax.