Please remember that you must claim the state sales tax refund (TABOR refund) when filing your state income tax return. If you claimed a 2023 refund, the TABOR refund will be combined and issued out with your refund. Unlike the 2022 Colorado cashback, no separate check will be issued. 


Software Developers | Income Tax


Information Requests & Developer Support

The Colorado MeF Letter of Intent as well as draft schemas and documentation for all tax types are available. Permission to access the Letter of Intent must be requested by emailing Once you have submitted your letter of intent and been accepted for participation, you will be given permission to access the appropriate folder(s) of schemas and information.

After requesting permission for access, you will receive an activation email that allows you to create a user name of your email address and add a private password. The system will then send you a second temporary password by email for two factor authentication that is entered on the two factor authentication screen.
If you need additional assistance, please email E-File Developer Support at