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Colorado Tax Calculator

The Colorado (CO) Tax Calculator is updated for the 2026/27 tax year. It estimates Colorado state income tax, federal income tax, and FICA/Medicare contributions to calculate your take-home pay. Colorado applies a flat income tax rate on taxable income, which simplifies filing but still allows credits for child care, earned income, and charitable contributions.

This tool reflects the latest federal and Colorado rates, helping both residents and part-year residents estimate tax liability or refund potential for 2026/27.

Quick Access Tools

Quick Colorado Tax Calculator

Enter your annual income and filing status, then click Calculate. Use tabs to add deductions, dependents, or withholdings. The calculator automatically applies the current flat state income tax rate and standard deductions.

Input key: F Used in Federal tax calculations S Used in State tax calculations

Quick Tax Calculation Detailed Tax Calculation
Filing Information Quick Inputs Income Details Deductions & Adjustments State Options IRA, Pensions & Annuities Withholdings

Filing Information

Set your filing status, dependants and personal details so the calculator can apply the correct Federal and State rules.

Quick Inputs

Provide a summary of your income and deductions to calculate your Federal and State tax position quickly.

Income Details

Enter the specific types of income that contribute to your Federal Adjusted Gross Income.

For Schedule B

Deductions & Adjustments

Deductions & Adjustments

Include any adjustments to income that reduce your Federal/State Adjusted Gross Income.

State Options

Some states apply local income taxes in addition to State tax. Enter your local rate if it applies.

IRA, Pensions & Annuities

Enter the details for your retirement contributions and income sources, which are used to compute values on **Form 8606**. This includes contributions to traditional IRAs, 529 savings plans, and rollovers, as well as income from rental properties, farms, unemployment, and other sources. Additionally, provide information on any disaster-related distributions or IRA rollovers you’ve made, and enter your capital gain distributions if applicable. These inputs are essential for accurately calculating your total retirement-related income and determining your tax liabilities or benefits, specifically regarding IRA deductions and distributions as outlined in **Form 8606**.

Withholdings

Enter withheld amounts to calculate refund or balance due.

How to Calculate Income Tax in Colorado for 2026/27

  1. Enter your gross income and any federal adjustments.
  2. Choose your filing status (Single, Joint, Head of Household, etc.).
  3. Click Calculate to see your estimated Colorado and federal tax liability.

Advanced Options

  • Include federal itemized deductions or the Colorado standard deduction.
  • Model 401(k), IRA, and other pre-tax savings plans.
  • Add state withholdings to forecast refund or balance due.
  • Apply credits such as the Colorado Child Tax Credit or Earned Income Credit where applicable.

Related Calculators

Additional Resources

Frequently Asked Questions

Quick answers to Colorado filing questions: flat tax rate, credits, deductions, and refund timing.

Is the federal SALT cap relevant to CO?

It affects federal itemizing; CO starts from federal taxable income, so results can flow through.

Does Colorado have an EITC?

Yes—Colorado has a state EITC based on a percentage of the federal EITC for eligible filers.

Where do Schedule A/B/C items feed in?

Compute on the federal forms (e.g., A, B, C) and reflect totals here.

Does CO have a retirement subtraction?

Yes—CO provides subtractions for certain retirement income; amounts depend on age/type.

Can I project next year using this page?

Yes—change the tax year and rerun with your assumptions.

Important Notes

All calculations are estimates for guidance only. Always review your return and consider professional advice when submitting official filings.