Colorado Substitute Form Developer

Welcome to the Colorado Department of Revenue’s Substitute Form Developer home page!

Substitute Form Developers are required to receive approval from CDOR before the release or distribution of any replicated forms.


To get started:

Click here to access the National Association of Computerized Tax Processors site.

Click here to access the Vendor ID Request Form.


Send any questions regarding Paper (1D) forms to dor_fd_vendor@state.co.us.

Send questions regarding e-file (2D) forms to dor_efileadmin@state.co.us.


Click here to review the Announcements page for the most up to date information.

Click here for 2022 Letter of Intent Google Form
Click here to access the 2022 SFD Specifications page.
Click here to access the 2022 Tax Forms page.
Click here to access the Frequently Asked Questions page.

2024
Letter of Intent

(Note: Please download the entire zip folder. Not just the Word document.)

2024
Tax Forms