Filing Information
For information on how to become authorized to file electronically with the Colorado Department of Revenue, please see Become Authorized to File Electronically. Also see Electronic Filing Concerns.
Online Tax Payment Letter for Your Clients
If your clients owe tax, they can pay online. It's simple, fast and secure. We've set up a letter that explains how to pay online. You may give it to your clients at the time they pick up their return from you. You may open the Online Tax Payment letter here and print it. Thanks for helping us promote online payment!