The Department of Revenue is processing 2023 income tax returns. For more information, please read the Department's announcement.

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Email: DOR_ExciseTax@state.co.us

Phone: (303) 205-8287

Web Message:

Send us a secure message through your Revenue Online account.

Hours of Operation:

8:00 a.m. to 4:30 p.m. Monday through Friday (except on state holidays)

Mailing Address:

Colorado Department of Revenue

Excise Tax Unit, Room 237

P.O. Box 17087

Denver, CO 80217-0087

Excise Tax Return Mailing Address:

Colorado Department of Revenue
Denver CO 80261-0009