Colorado e filer 2026

1. Click ‘Get Form’ to open the Colorado 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 Corporation Income.
4. Fill in your personal information, including your last name, first name, middle initial, and Social Security Number (SSN) or Individual Taxpayer Identification Number (ITIN). If applicable, include your spouse's details.
5. Complete your address section with your street address, city, state, and ZIP code.
6. Mark the box next to each document you are submitting. Refer to the Colorado Department of Revenue website for guidance on required documentation for credits.
7. Sign and date the form at the bottom. Ensure that all information is accurate before submission.

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