CO 106 Information

Use this guide to electronically file your return for free using Revenue Online at or using private e-file software. Only mail the paper form if you are not able to electronically file the return for any reason. Please note that filing on paper can increase return errors and delay refunds. All forms in this booklet may be photocopied.

Link to official form info:

Link to official form info for 106

Tax Reminder works year round to keep official tax form info up-to-date for Colorado and the rest of the USA. The IRS and states change their forms often, so we do the hard work for you of figuring out where the official form info is located.

To access the official link to form CO 106 and get reminded when it's due, sign up for a free Tax Reminder account:

  • Upcoming Due Dates in the Next Year:*
  • Friday Apr 15, 2022
  • Create a free account to see exactly when to file this form, receive email or SMS notification reminders, and to keep a record of filing it in your history.
    * Due dates are based on the filing requirements for this form and may vary depending on your tax year.

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