​​​​​​Save time and file online!

You may use the Department's free e-file service Revenue Online to file your state income tax. You do not need to login to Revenue Online to File a Return. After you file, you have the option of setting up a Login ID and Password to view your income tax account in Revenue Online. Or, you may opt to e-file through a paid tax professional or purchase tax software to complete and file returns. You may submit your documentation as an E-Filer Attachment via Revenue Online, as well.

If filing by paper, visit the Credits & Subtractions Forms page to download the forms and/or schedules needed to file for the credits listed below. Be sure to use the form for the same tax year for which you are filing. For example, if you are filing a return for 2018, you must include the credit form(s) for 2018 with your return.

Not seeing what you are looking for?

In addition to income tax credits, Colorado also has income tax subtractions (sometimes called deductions). Income tax subtractions change your Colorado Taxable Income from the amount of your Federal Taxable Income. For more information, visit the Income Tax Subtractions web page.

Credits in Alphabetical Order by Name