Download Form 104 Instructions (PDF)

Colorado Individual Income Tax Filing Guide Updated 11/-0001

Printable Colorado Income Tax Form 104 Instructions

Use this instructional booklet to guide you in filling out and filing your Form 104 individual income tax return. For more information about the Colorado Income Tax, see the Colorado Income Tax page.

Colorado may also allow you to e-file your Form 104 Instructions instead of mailing in a hard copy, which could result in your forms being received and processed faster. For more details, read more about the Colorado e-filing program.

Document Source: https://www.colorado.gov/pacific/sites/default/files/104Book.pdf

View Other Colorado Tax Forms

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Individual Income Tax Return

Form 104 is the general, and simplest, income tax return for individual residents of Colorado. You may file by mail with paper forms or efile online.

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Individual Income Tax Filing Guide

Use this instructional booklet to guide you in filling out and filing your Form 104 individual income tax return.

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Estimated Individual Income Tax Return

You must pay estimated income tax if you are self employed or do not pay sufficient tax withholding. Estimated tax payments are due on a quarterly basis; The due dates are: April 15 (first calender quarter), June 15 (second calender quarter), September 15

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Nonresident Income Tax Return

Nonresidents of Colorado who need to file income taxes in the state need to file Form 104PN.

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Estimated Income Tax Underpayment Form

If you failed to pay or underpaid your estimated income taxes the previous tax year, you need to fill out Form 204 to calculate and pay any penalties or fees owed.