Colorado State Tax Calculator (2026)
Estimate your Colorado state income tax for 2026 using the published bracket schedule and standard deduction. State tax is separate from federal tax.
Reviewed by Teja K, CPA · last reviewed . General information, not tax advice for your situation. A calculator is an estimate, not a filed return. How we research and review this.
Before the state standard deduction
Income entered
$0
Standard deduction
$16,100
Taxable
$0
Colorado tax
$0
Separate from your federal bill
Effective rate
0.00%
Marginal rate 4.40%
Not included in this figure
- Local and municipal income tax: No local rates are modelled. — a resident of a city that levies its own income tax will owe more
- State credits, subtractions and addbacks: State-specific adjustments to income are out of scope. — can move the result in either direction
Tax year 2026. Colorado tax only — federal tax is separate. Rate figures as of January 1, 2026.
How Colorado taxes income
Colorado charges flat 4.4%. State tax is a separate calculation from your federal return rather than a share of it — Colorado sets its own schedule and its own definition of taxable income.
- Rate: 4.4% on all taxable income
- Brackets: A single rate, so no bracket to cross
- Standard deduction: $16,100 single / $32,200 joint
- Personal exemption: None
Rate figures are as of January 1, 2026 and were checked against Colorado Department of Revenue on 2026-09-28 — flat 4.4% against the Colorado Department of Revenue. Colorado can still change them mid-year.
What catches people out in Colorado
- Colorado applies one rate of 4.4% to all taxable income, so your marginal and average state rates are the same and extra income does not push you into a higher band.
- The Colorado standard deduction is $16,100 for a single filer and $32,200 for a couple filing jointly. It is a separate figure from the federal standard deduction and usually much smaller, so itemising is a decision you make once federally and again for the state.
What this estimate leaves out
Three things are deliberately outside this calculation, because they change more often than annually and a confident wrong number does real damage on a tax page.
- Personal exemptions are not applied.
- Local and city income tax is not included. New York City is the significant one nationally.
- State-specific credits, subtractions and income addbacks are out of scope and can move the result either way.
If you have income in India, Colorado is where treaty relief runs out
States are not parties to the India-US tax treaty, and a state credit for "taxes paid to other jurisdictions" almost always means other US states rather than other countries.
So NRO interest, Indian rental income or a gain on Indian shares can be taxed by Colorado with no credit for the Indian tax deducted at source — even though Form 1116 largely neutralises that same tax federally.
The treatment is not uniform across states, so treat this as the general position rather than as Colorado's confirmed one, and check the credit rules with Colorado Department of Revenue before relying on relief.
Sources
Frequently Asked Questions
Does Colorado have a state income tax?
Yes — Colorado charges flat 4.4%. Figures are as of January 1, 2026.
Is Colorado tax on top of federal tax?
Federal tax applies regardless of which state you live in, and is calculated separately. Colorado tax is additional to it, and uses its own brackets and its own deduction rather than a share of your federal bill.
I moved to or from Colorado during the year. Does this work?
Not directly. A part-year move usually means a part-year return in each state with income apportioned between them, and the state you left applies its own residency test rather than accepting a new address. Use this to size the rates, then treat the apportionment as a separate question.
What filing statuses does this cover?
Single and married filing jointly. Those are the only two schedules published in the sourced data behind this calculator, so head of household and married filing separately are left out rather than approximated from a schedule nobody verified.
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