In the Colorado tax return, certain credits and subtractions require the taxpayer to submit proof of eligibility to claim them.
At this time there is no place to attach a PDF file to the return in Desktop. It can be uploaded here or mailed in with Form DR1778 and reported in the return.
To indicate that the document has been uploaded to Colorado Revenue Online or mailed, from the main menu of the Colorado return select;
- Basic Information
- Supporting Documentation
Use the drop down menu to select the method the taxpayer has chosen.
Additional Information: