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The Daily Insight

How does Colorado tax part-year residents?

Author

John Thompson

Published Mar 21, 2026

Part-year residents and nonresidents must first calculate Colorado tax as though they were full-year residents. The calculated tax is then apportioned, based on the percentage of their income that is subject to Colorado income tax.

Does Colorado require you to file state income taxes?

You must file a Colorado income tax return if during the year you were: A full-year resident of Colorado, or. A part-year resident of Colorado with taxable income during that part of the year you were a resident, or.

Does Colorado tax income from other states?

As a full-year Colorado resident the taxpayer must pay Colorado tax on all of the taxable income. The credit for taxes paid to another state prevents double taxation of income by two states and will not apply in this situation since the other state is not taxing the income.

What taxes do you pay in Colorado?

The Centennial State has a flat income tax rate of 4.63%, and one of the lowest statewide sales taxes in the country, at just 2.90%. However, because of numerous additional county and city sales taxes, actual combined rates can be as high as 11.20%.

How much income tax do you pay in Colorado?

If you live in Colorado, you pay a state income tax of 4.63 percent on your federal taxable income each year. But you can offset some of your taxable income by subtracting a few state-specific tax credits, each of which is subject to change from one year to the next.

Who is a nonresident on a Colorado tax return?

A nonresident is an individual who did not reside within the boundaries of Colorado at any time during the tax year. However, the person may have temporarily worked in Colorado and/or received income from a source in Colorado. A nonresident is required to file a Colorado income tax return if they:

Do you have to file a Colorado income tax return?

During the year you were a full-year, part-year or non-resident of Colorado with Colorado taxable income AND you were required to file a federal income tax return. You had a Colorado income tax liability for the year.

What does a part year resident in Colorado do?

Nonresident of Colorado will complete the Colorado Individual Income Tax Return (DR 0104) and the Nonresident Tax Calculation Schedule (DR 0104PN) to determine what income will be claimed on the DR0104 form. A part-year resident is an individual who was a resident of Colorado for only part of the tax year.