Colorado taxes income at a flat rate of 4.63 percent

Colorado has a flat income tax, meaning everyone pays the same percentage regardless of how much they earn. That rate is 4.63 percent of your federal taxable income. Unlike some states that use tax brackets — where higher earners pay higher rates — Colorado applies 4.63 percent to all income levels.

The tax applies to wages, self-employment income, investment gains, and retirement distributions. You file through the Colorado Department of Revenue, and the state uses your federal tax return as the starting point for calculating what you owe.

Key Takeaways

  • Colorado's income tax rate is 4.63 percent, applied equally to all income levels.
  • The state taxes wages, self-employment income, capital gains, and some retirement distributions.
  • You calculate Colorado tax based on your federal taxable income, not your gross earnings.
  • Colorado offers tax credits for dependent children, property taxes paid, and certain education expenses.
  • The state has no local income taxes — only the state rate applies no matter where in Colorado you live.

What income Colorado taxes and what it does not

Colorado taxes most forms of income: W-2 wages, self-employment earnings, rental income, interest, dividends, and capital gains. The state also taxes distributions from retirement accounts like IRAs and 401(k)s, though some distributions may be partially exempt depending on your age and income.

Social Security benefits are not taxed by Colorado. Military pensions and some other government pensions receive preferential treatment — you can exclude up to $24,000 of military retirement pay from state taxation. Federal pensions and other government pensions do not receive this exemption.

Long-term capital gains (assets held more than one year) are taxed at the same 4.63 percent rate as ordinary income. Colorado does not offer a lower rate for investment gains the way some states do.

How Colorado calculates your tax bill

Colorado starts with your federal taxable income — the number on your federal tax return after you have claimed deductions and exemptions. The state does not use your gross income or adjusted gross income. This means if you itemize deductions on your federal return, Colorado recognizes those same deductions.

From federal taxable income, Colorado allows you to claim a standard deduction. For 2024, the Colorado standard deduction is $4,850 for single filers and $9,700 for married couples filing jointly. If your federal taxable income is below these amounts, you owe no Colorado state income tax.

After subtracting the standard deduction, you multiply the remaining amount by 4.63 percent. Then you subtract any tax credits you are may have access to to claim. The result is your Colorado income tax liability.

Tax credits that reduce what you owe

Colorado offers several tax credits that directly reduce your tax bill. The dependent exemption credit allows you to claim $4,000 per dependent child. The property tax credit helps renters and homeowners whose property taxes exceed a certain percentage of income — the amount varies based on your income level.

The state also offers credits for education expenses, including the education expense credit for K-12 tuition and fees, and credits related to 529 college savings plans. If you paid tuition for higher education, you may be able to claim the higher education expense credit.

These credits are not refundable, meaning they can reduce your tax to zero but cannot result in a refund. If your credits exceed your tax liability, the excess does not come back to you.

Filing requirements and deadlines

You must file a Colorado return if your income exceeds the state's filing threshold. For 2024, that threshold is generally the same as your standard deduction — $4,850 for single filers, $9,700 for married couples. If you have self-employment income, the threshold is lower.

Colorado income tax returns are due on the same date as your federal return: April 15 (or the next business day if April 15 falls on a weekend). You file Form 104, Colorado's resident income tax return, along with any required schedules. If you need more time, you can request an extension, which gives you until October 15.

If you owe Colorado income tax, you can pay online through the Department of Revenue website, by mail, or through an authorized payment processor. Payments made by the April 15 deadline avoid penalties and interest.

Withholding and estimated tax payments

If you are a W-2 employee, your employer withholds Colorado income tax from your paycheck based on the W-4 form you complete. The withholding is calculated using the 4.63 percent rate and your claimed exemptions.

If you are self-employed or have income not subject to withholding, you may need to make estimated tax payments to Colorado quarterly. These are due April 15, June 15, September 15, and January 15. If you expect to owe more than $500 in Colorado income tax and less than $100 was withheld, you are generally required to make estimated payments.

You can adjust your W-4 withholding at any time during the year if you realize too much or too little is being taken out. Contact your payroll department or use the IRS withholding calculator to estimate the correct amount.

No local income taxes in Colorado

Colorado has no local income taxes — no city, county, or municipal income tax on top of the state rate. This means your income tax liability is the same whether you live in Denver, Boulder, or a rural county. Some Colorado cities and counties do impose sales taxes or other local taxes, but income is not one of them.

This simplifies tax filing for Colorado residents compared to states where local jurisdictions add their own income tax on top of the state rate.

Frequently Asked Questions

Does Colorado tax retirement income differently?

Social Security is not taxed. Military pensions can exclude up to $24,000 from taxation. Other retirement account distributions (IRAs, 401(k)s, pensions) are taxed as ordinary income at 4.63 percent, though some distributions may be partially exempt based on age and income level. Check the Colorado Department of Revenue website for current exemption rules.

What if I moved to Colorado partway through the year?

You file a part-year resident return and pay Colorado tax only on income earned while you were a resident. You will need to show your move date and provide documentation of residency change. The state uses the date you established residency to determine which months count as Colorado income.

Can I deduct federal income taxes paid from my Colorado return?

No. Colorado does not allow a deduction for federal income taxes paid. You calculate Colorado tax based on federal taxable income, but you cannot reduce that further by subtracting what you paid to the IRS.

What happens if I underpay my estimated taxes?

The Colorado Department of Revenue charges interest and penalties on underpayment. The penalty is calculated based on how much you underpaid and how late the payment was. If you realize you will owe more than expected, paying as soon as possible reduces the penalty amount.

Do I need to file if I had no income?

No, unless you are claiming a refundable credit or need to file for other reasons (such as claiming a dependent exemption credit). If you had no income and no credits to claim, you are not required to file a Colorado return.