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Colorado State Income Tax Calculator

Calculate your 2026 Colorado state income tax. See your bracket breakdown, effective rate, and how Colorado compares to neighboring states.

4.4% Flat Tax
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Full-year residents only; filers under 65, not blind and not claimable on another return. Eligible pre-tax wage deductions only. No retirement, business income, QBI, NOLs, Schedule 1-A deductions or special state adjustments. Enter itemized deductions after applicable limits. Separate state credits are excluded except Iowa ordinary exemption credits. Other facts require a separate calculation.

State Income Tax
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Colorado · 2026
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Weekly Allocation After Income Tax
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The annual amount is gross income minus entered pre-tax deductions and modeled federal and state income tax. Monthly and weekly amounts divide it by 12 and 52. These allocations exclude Social Security and Medicare (FICA), local taxes, other payroll taxes, and unmodeled paycheck deductions. They do not estimate paycheck take-home or actual withholding.

Effective State Income Tax Rate vs Neighboring States

About Colorado state taxes (Tax year 2026)

Colorado has a flat income tax rate of 4.4% on all taxable income. The state uses federal taxable income as the starting point, meaning Colorado conforms to federal standard deduction amounts.

Groceries are exempt from state sales tax. Prescription drugs are exempt.

Colorado's 4.4% flat rate is near the national average. Its low state sales tax rate of 2.9% is offset by relatively high local add-ons.

Filing in Colorado: returns for tax year 2026 are administered by the Colorado Department of Revenue and are generally filed in 2027 by the federal April deadline unless Colorado declares a state-specific extension. Tax type on this return: Flat. Top marginal rate: 4.4%. State sales-tax rate: 2.9%. For the most current contact info, see the Federation of Tax Administrators directory.

Colorado — What is Colorado's income tax rate? Colorado has a flat income tax rate of 4.4% applied to all taxable income. The state uses federal taxable income as its starting point.

Colorado — Does Colorado tax groceries? No, groceries are exempt from Colorado's 2.9% state sales tax. However, some local jurisdictions do tax groceries.

Colorado — Does Colorado have a TABOR refund? Yes, Colorado's Taxpayer's Bill of Rights (TABOR) limits government revenue growth. When revenue exceeds the limit, taxpayers receive refunds, which can be several hundred dollars per person.

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Reviewed methodology

How this page is reviewed

High YMYL · Last verified 2026-11-06

See methodology, assumptions & sources
Risk tierHigh YMYL
AuthorCalculover Editorial Team Tax education
Editorial ownerCalculover Tax & Payroll Desk State-tax methodology owner
ReviewerCalculover Editorial Review Government-source and limitation review
Last reviewed2026-11-06
Last verified2026-11-06
Data effective date2026-01-01
JurisdictionColorado

Methodology

These pages estimate annual state income tax for the selected 2026 jurisdiction and filing status. The route's coverage panel identifies the supported income basis, deductions, credits and exclusions.

Assumptions

  • Enter the income basis and eligible pre-tax deductions requested by the calculator; gross wages, federal AGI and state AGI are not interchangeable.
  • Some methods require confirmed state facts or explicit projection assumptions. An unavailable component is not zero tax.

Limitations

  • The estimate excludes unmodeled income, adjustments, local taxes and special filing situations. Utah's indexed-credit assumptions remain provisional while final 2026 instructions are pending.
  • Annual liability differs from withholding and paycheck take-home. Confirm the current official forms and source versions for a complete return.

Sources

Professional guidance: This page is for state-tax education only and is not tax, legal, financial, or investment advice. State tax decisions and multi-state filing should be reviewed with a CPA or enrolled agent licensed in the relevant states.

Colorado Income Tax FAQs

What is the Colorado income tax rate?

Colorado taxes all taxable income at a flat rate of 4.40%. This applies equally to all income levels regardless of how much you earn.

How is Colorado income tax calculated?

Multiply your taxable income by 4.40%. For example, a taxpayer with $75,000 in taxable income would owe $3,300 in Colorado income tax.

Does Colorado have a standard deduction?

Colorado uses federal basic deductions and the enacted $300,000-or-more AGI limit: $1,000 single or head of household and $2,000 joint. Itemized estimates add back the entered state-income-tax component subject to the federal standard-deduction limit, then reduce the high-income addback to avoid duplication. AMT, QBI, pass-through items, Schedule 1-A deductions, special state adjustments and credits are excluded.

How can I reduce my Colorado income taxes?

Common strategies include maximizing pre-tax retirement contributions (401k, IRA), contributing to an HSA, and taking advantage of any available state tax credits.

How does Colorado's 4.40% flat tax compare to neighboring states?

Colorado's flat rate of 4.40% can be compared to neighboring states using the chart on this page. States with no income tax offer the lowest burden, while progressive states may be higher or lower depending on your income level.