Colorado Income Tax Calculator 2026
Calculate your combined federal and Colorado state income tax for 2026. See your federal brackets, Colorado tax, effective rate, and take-home pay — all calculated privately in your browser.
How Colorado Income Tax Calculator Works
Calculate your Colorado income tax (4.4% flat rate) plus federal tax. See combined brackets, effective rate, and take-home pay. Enter your values into the form above and the calculator processes them instantly in your browser — no data is sent to any server.
Colorado Income Tax: 4.4% Flat Rate
Colorado uses a flat income tax rate of 4.4%, meaning all taxable income is taxed at the same rate regardless of how much you earn. Colorado uses a flat tax rate applied to federal taxable income.
On top of the 4.4% state tax, Colorado residents also pay federal income tax ranging from 10% to 37%. This calculator combines both federal and Colorado state tax to show your total liability, effective rate, and take-home pay.
How Colorado's Flat Tax Compares
A flat tax simplifies filing — you pay 4.4% on all taxable income without navigating multiple brackets. Compared to the national median top state rate of around 5.5%, Colorado's 4.4% rate is below average. Because the 4.4% applies to federal taxable income, a single filer earning $100,000 pays 4.4% of $83,900 (after the $16,100 federal standard deduction), about $3,692, not $4,400.
States with flat taxes tend to have simpler returns and more predictable tax bills. The trade-off is that lower-income residents pay the same percentage as higher earners, unlike graduated systems where rates increase with income.
Reducing Your Colorado Tax Bill
While you cannot change the flat rate, you can reduce your taxable income. Contributions to traditional 401(k) and IRA accounts reduce both your federal and Colorado state taxable income. The 2026 401(k) limit is $24,500 ($32,500 with catch-up for age 50+). HSA contributions are also pre-tax for both federal and state purposes in most states.
Tips for Getting Accurate Results
For the most accurate results, use up-to-date numbers from official sources. Double-check your inputs before calculating — small errors in the starting values can lead to significantly different outputs. If you are comparing scenarios, keep all variables the same except the one you are testing. Save or screenshot your results for future reference. This calculator uses standard formulas and is designed to give you a reliable quick estimate, though professional advice may be needed for complex situations.
Frequently Asked Questions
What is Colorado’s income tax rate?
Colorado has a flat income tax rate of 4.4% for 2026, applied to your federal taxable income. All taxable income is taxed at this rate regardless of how much you earn.
How much state tax will I pay in Colorado on $100,000?
On a $100,000 salary a single filer pays about $3,692: Colorado taxes federal taxable income, so the 4.4% applies to $83,900 after the $16,100 federal standard deduction. On $100,000 of federal taxable income the tax would be $4,400.
Does Colorado allow standard deductions?
Yes, indirectly. Colorado starts from federal taxable income, so your federal standard deduction ($16,100 single, $32,200 joint in 2026) or your federal itemized deductions already reduce Colorado taxable income. A single filer earning $60,000 pays 4.4% of $43,900, about $1,932.
Is Colorado’s tax rate competitive?
At 4.4%, Colorado’s flat rate is below the national average top state rate of about 5.5%. This makes it relatively tax-friendly.
Can I reduce my Colorado state tax?
Yes. Contributions to traditional 401(k), IRA, and HSA accounts reduce your taxable income for both federal and Colorado state purposes.