Colorado's income tax rate and how it works

Colorado has a flat income tax rate of 4.4% on all taxable income, regardless of how much you earn. This rate applies to wages, self-employment income, investment gains, and most other sources of income. The 4.4% is deducted from your paycheck by your employer, or you pay it yourself if you're self-employed or have income that isn't subject to withholding.

The flat rate means a person earning $30,000 pays the same percentage as someone earning $300,000. However, you don't pay 4.4% on your entire income—you pay it only on the amount left after you subtract the standard deduction or itemized deductions, which reduces your taxable income.

Key Takeaways

  • Colorado's state income tax rate is a flat 4.4% on all taxable income, with no higher brackets for higher earners.
  • You only pay tax on income above the standard deduction, which varies by filing status and age.
  • Your employer withholds Colorado tax from your paycheck automatically if you work in the state.
  • Self-employed people and those with investment income may need to make quarterly estimated tax payments to Colorado.
  • Colorado offers tax credits for dependents, education expenses, and other situations that can reduce what you owe.

Standard deductions and filing status in Colorado

The standard deduction is the amount of income you can earn without owing any state tax. In Colorado, the standard deduction depends on your filing status and whether you're 65 or older. For the 2024 tax year, a single filer under 65 has a standard deduction of $3,850, while a married couple filing jointly has $7,700. These amounts increase if either spouse is 65 or older.

If your total income is below the standard deduction for your filing status, you owe no Colorado state income tax. For example, a single person earning $3,500 would owe nothing because that's below the $3,850 threshold. If you earn $5,000, you'd pay 4.4% only on the $1,150 above the deduction.

How withholding works on your paycheck

When you start a job in Colorado, your employer uses a W-4 form to determine how much state tax to withhold from each paycheck. The amount withheld depends on your income, filing status, and the number of dependents you claim. Your employer sends this withheld money to the Colorado Department of Revenue on your behalf throughout the year.

If too much tax is withheld, you'll receive a refund when you file your return. If too little is withheld, you'll owe money when you file. You can adjust your withholding at any time by submitting a new W-4 to your employer—this is useful if your life circumstances change, such as getting married, having a child, or taking a second job.

Self-employment and estimated tax payments

If you're self-employed or have income that isn't subject to withholding—such as rental income, freelance work, or investment gains—you may need to make quarterly estimated tax payments to Colorado. These payments are due on April 15, June 15, September 15, and January 15 of the following year.

You calculate estimated payments based on your expected annual income and tax liability. If you underpay, you may owe a penalty when you file your annual return. Many self-employed people work with a tax professional to determine the correct amount, but you can also use the Colorado Department of Revenue's worksheets to estimate on your own.

Tax credits that reduce what you owe

Colorado offers several tax credits that directly reduce the amount of state tax you owe. The dependent exemption credit allows you to claim a credit for each dependent, which can significantly lower your tax bill if you have children or support other family members. The credit amount varies by year and is set by the state legislature.

Other credits include the education expense credit for certain may have access to education costs, the child care credit for expenses paid to care for dependents while you work, and credits for property tax paid on your primary residence. Some credits are refundable, meaning you can receive money back even if you owe no tax. Check the Colorado Department of Revenue website or your tax software to see which credits explore to your situation.

What income is taxed in Colorado

Colorado taxes most types of income, including wages, salaries, tips, self-employment income, interest, dividends, capital gains, and retirement distributions. However, some income is partially or fully exempt. Social Security benefits are not taxed by Colorado, and military pensions receive special treatment under state law.

If you receive income from sources outside Colorado—such as a job in another state or investment income—you may owe tax to both Colorado and that other state. Colorado allows a credit for taxes paid to other states to prevent double taxation, but the rules are complex and depend on where the income was earned and where you live.

Filing your Colorado return

You file your Colorado state income tax return using Form 104, the Colorado Individual Income Tax Return. The important date is typically April 15, the same as the federal important date. You can file electronically through the Colorado Department of Revenue's website or through tax software, or you can mail a paper return.

If you need more time, you can request an extension, which gives you until October 15 to file. An extension delays your filing important date but does not delay your payment important date—if you owe tax, it's still due by April 15, and interest and penalties explore to unpaid amounts after that date.

Frequently Asked Questions

Do I have to pay Colorado income tax if I work remotely for an out-of-state company?

Yes, if you live in Colorado and work remotely, you owe Colorado income tax on your wages regardless of where your employer is located. Colorado taxes income earned by residents, even if the employer is in another state. You may also owe tax to the other state depending on its rules, but Colorado allows a credit for taxes paid elsewhere.

What happens if I move to Colorado mid-year?

You're a Colorado resident for tax purposes starting the day you move to the state. You'll owe Colorado tax on income earned after that date. You may also owe tax to your previous state on income earned there before you moved. File returns in both states for the year you moved, reporting income for the portion of the year you lived in each state.

Is retirement income taxed differently in Colorado?

Most retirement income, including distributions from 401(k)s and IRAs, is taxed as ordinary income at the 4.4% rate. However, military pensions and some other retirement income receive preferential treatment. Social Security is not taxed by Colorado. If you're over 55 and receive a pension, you may be able to exclude a portion of it—check with the Colorado Department of Revenue for current rules.

Can I deduct student loan interest on my Colorado return?

Colorado does not allow a deduction for student loan interest on the state return, even if you claim it on your federal return. However, you may be able to reduce your taxable income through other deductions or credits. Review the instructions for Form 104 or speak with a tax professional about what deductions and credits explore to your situation.