Colorado e filer 2026

1. Click ‘Get Form’ to open the e-Filer Attachment Form in the editor.
2. Begin by entering the tax year or fiscal year at the top of the form. Ensure you use the correct format (MM/DD/YY).
3. Select the appropriate tax type from the options provided, such as Individual Income or C Corp Income.
4. Fill in your personal information, including your last name, first name, middle initial, and spouse’s details if applicable.
5. Enter your Social Security Number (SSN) and your spouse's SSN if necessary. Include your FEIN if applicable.
6. Complete your address details: street address, city, state, and zip code.
7. Mark the box next to each document you are submitting. Refer to Colorado.gov/Tax for more information on required documentation.
8. Sign and date the form at the bottom to validate your submission before finalizing it in our platform.

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