File Individual Income Tax Online | Department of Revenue - Taxation

First, complete the federal income tax return you will file with the Internal Revenue Service (IRS). You will use numbers from your federal return on your Colorado income tax return.

Revenue Online: You may use the Colorado Department of Revenue's free e-file and account 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.
You may opt to e-file through a paid tax professional or purchase tax software to complete and file returns.

Tax Professionals:

Individual Income Tax Services in Revenue Online

Login Required

Amend individual income tax returns
View 1099-Gs (issued by the Colorado Department of Revenue)
View payment history
View account balances
View letters from the Department
Update your account mailing address
Set up Third Party access to your tax account (Instructions)

No Login Required

Make a payment
File individual income tax returns - Please note that filing your return in Revenue Online does not automatically set up an account for you
Check your refund status
Submit e-Filer Attachments for income tax returns
File a protest
Add Power of Attorney

How-To Videos

How To Set Up Your Revenue Online Account

How to Make a Payment Using Revenue Online

Requesting a Letter ID

Username Recovery & Password Reset

Step-by-Step Instructions