The Fuel Tax Unit can assist with questions about state fuel taxes and the International Fuel Tax Agreement (IFTA). Use one of the following methods to contact the Fuel Tax Unit.
Email: DOR_FuelTax@state.co.us
Phone: (303) 205-8205
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:
- For the following forms:
- DR0122 IFTA Return
- DR 0133 Passenger Mile Return
- DR 1510 Aviation Sales Tax Return
- DR 7118 Exempt Fuel Claim Form
To: Colorado Department of Revenue, Denver, CO 80216-0009
All Other correspondence to:
Colorado Department of Revenue
Fuel Tax Unit, Room 108
P.O. Box 17087
Denver, CO 80217-0087