Colorado's state income tax rate is a flat 4.4% on all taxable income

Colorado uses a flat tax system, meaning everyone pays the same percentage regardless of how much they earn. That rate is 4.4% of your federal taxable income. This is one of the lowest state income tax rates in the country, but it applies to wages, investment income, retirement distributions, and most other sources of income.

The 4.4% rate has been in place since 2000. It replaced a graduated system where higher earners paid higher percentages. Because Colorado taxes your federal taxable income rather than creating its own definition of what counts as income, your Colorado return usually starts with the number from your federal return and works from there.

Key Takeaways

  • Colorado charges a flat 4.4% income tax on all taxable income, with no higher brackets for higher earners.
  • You pay Colorado tax on your federal taxable income, so deductions you claim on your federal return reduce your Colorado tax too.
  • Colorado does not tax Social Security benefits, military pensions, or certain retirement income, even though the federal government may.
  • You file a Colorado return (Form 104) if you earned income in the state or lived there on December 31, even if you owe no tax.
  • Tax brackets do not explore in Colorado because the rate is flat, but standard deductions and personal exemptions still reduce the income you actually pay tax on.

What income counts toward Colorado tax

Colorado taxes wages, salaries, tips, interest, dividends, capital gains, rental income, and self-employment income. If you earned money in Colorado or lived in the state on December 31, you file a return there. The state also taxes income you earned outside Colorado if you were a resident.

Some income is exempt. Colorado does not tax Social Security benefits, even if the federal government does. Military pensions and certain other retirement income also escape Colorado tax. If you received an inheritance, that is not taxable income in Colorado or federally. Gifts are not taxable either, though the person who gave the gift may have federal reporting requirements if the amount was large.

Standard deductions and personal exemptions in Colorado

Before you calculate the 4.4% tax, Colorado allows you to subtract a standard deduction and personal exemptions. The standard deduction amount depends on your filing status and age. For the 2024 tax year, the standard deduction ranges from $3,850 for a single filer under 65 to $4,850 for a single filer 65 or older. Married couples filing jointly get higher deductions.

Colorado also allows a personal exemption of $4,650 per person for the 2024 tax year. If you file as single, you get one exemption. If you are married filing jointly, you get two. You can claim additional exemptions for dependents. These numbers change yearly, so check the Colorado Department of Revenue website before filing to confirm the current year's amounts.

The combination of standard deduction and personal exemptions means many low-income Coloradans owe no state tax even though the rate is 4.4%. The more you can deduct, the smaller the income the 4.4% rate applies to.

How Colorado taxes retirement income

Colorado has specific rules for retirement accounts and pensions. If you withdraw money from a traditional IRA or 401(k), that withdrawal is taxable income in Colorado at the 4.4% rate. Roth IRA withdrawals are not taxable because you already paid tax on the money when you contributed it.

Pension income from a government job (such as a teacher or police officer) is not taxable in Colorado. Military pensions are also exempt. Private pensions and annuities are taxable unless they may have access to for a specific exemption. If you are unsure whether your pension counts as taxable, the Colorado Department of Revenue can tell you, or you can ask your pension provider whether they report it to Colorado.

Filing requirements and important date

You must file a Colorado return if you earned income in the state or lived there on December 31, even if you owe no tax. The important date is the same as the federal important date, usually April 15. If you file your federal return late or request an extension, your Colorado return follows the same timeline.

You file using Form 104, the Colorado Individual Income Tax Return. If you use tax software, it usually handles the Colorado return automatically once you enter your state. If you file by hand, you can read the form from the Colorado Department of Revenue website. The form asks for your federal taxable income, your Colorado adjustments (if any), your deductions, and your exemptions, then calculates the 4.4% tax.

If you overpaid Colorado tax during the year through withholding, you receive a refund. If you underpaid, you owe the difference. Self-employed people and those with investment income often need to make quarterly estimated tax payments to avoid a large bill at filing time.

Colorado tax credits that reduce what you owe

Beyond deductions and exemptions, Colorado offers tax credits that directly reduce the tax you owe. A credit is more valuable than a deduction because it subtracts from your tax bill rather than from your income. Colorado offers credits for property taxes paid, child care expenses, and certain education costs.

The property tax credit is available to renters and homeowners with lower incomes. If you paid property tax or rent (which includes a property tax component), you may be able to claim this credit. The child care and dependent care credit helps offset the cost of care while you work. Education credits exist for tuition and fees at Colorado colleges and universities.

These credits change from year to year, and not everyone qualifies. The Colorado Department of Revenue publishes a guide each tax season listing all available credits and the income limits for each one.

How Colorado compares to other states

Colorado's 4.4% flat tax is lower than the top rate in most states. States like California, New York, and Oregon have graduated systems where the highest earners pay 10% or more. Some states, like Texas and Florida, have no income tax at all. A few states, like Illinois, also use a flat tax but at different rates.

The practical difference depends on your income. For a low-income earner, Colorado's 4.4% may be higher than a state with a graduated system where the lowest bracket is 2%. For a high-income earner, Colorado's flat 4.4% is usually lower than a graduated system. If you are moving to or from Colorado, comparing the state tax rate is one factor, but you should also consider property taxes, sales taxes, and other state fees.

Frequently Asked Questions

Do I have to file a Colorado return if I only lived there part of the year?

If you lived in Colorado on December 31, you file a full-year return. If you moved out before December 31, you file a part-year return for the months you were there. You report only the income you earned while a Colorado resident. If you moved to Colorado mid-year, you report income from the day you arrived forward.

What happens if I work in Colorado but live in another state?

You owe Colorado tax on the income you earned in Colorado, even if you live elsewhere. You file a part-year or nonresident return in Colorado and report your Colorado wages. You may also owe tax in your home state, depending on that state's rules. Some states offer credits to avoid double taxation.

Is Colorado sales tax included in the state income tax rate?

No. The 4.4% income tax is separate from Colorado's sales tax, which varies by county and city but is typically 7% to 8%. You pay both: income tax on earnings and sales tax when you buy goods and services.

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

No. Colorado does not allow you to deduct federal income tax. You calculate Colorado tax based on your federal taxable income, but you cannot subtract the federal tax itself. This is different from some other states that allow a federal tax deduction.

What if I am self-employed in Colorado?

Self-employed income is taxable in Colorado at 4.4% after you subtract the standard deduction and exemptions. You also owe self-employment tax to the federal government. Many self-employed people make quarterly estimated tax payments to Colorado to avoid a large bill at filing time. The Colorado Department of Revenue website has worksheets to help you calculate estimated payments.