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At the screen Tell Us How You Will Submit Documentation under the Colorado state income tax return, you see three options.
- You may upload the documents to the Colorado Department of Revenue website,
- You may mail the documents with Form DR 1778 after electronically filing the tax return, or
- You may attach the documents to your paper-filed tax return.
See here.
Colorado Department of Revenue Income 48: Charitable Contribution Subtraction states:
Documentation
Submit this documentation when you file your return using the E-Filer Attachment function of Revenue Online, or attach the documentation to your paper Colorado income tax return.
