Please remember that you must claim the state sales tax refund (TABOR refund) when filing your state income tax return. If you claimed a 2023 refund, the TABOR refund will be combined and issued out with your refund. Unlike the 2022 Colorado cashback, no separate check will be issued. 


Contact the Fee Unit


Note: please allow three (3) business days for an email response. 

Email Tips

  • Include your name, contact telephone number, address, and Colorado Account Number (CAN), if known.
  • Explain your inquiry completely and provide all applicable details.
  • Do not send multiple emails. Emails are answered in the order in which they are received.
  • Do not include private personally identifiable information (e.g. your Social Security Number). Email communication with the Department is unencrypted by default. If you would like to send a secure message, you can do so using your Revenue Online account. 


(303) 205-8287 Option 2

Note:  If agents are not available, please send an email or secure web message. 

Hours of Operation

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

Mailing Address

Fee Return Payments

Colorado Department of Revenue 
Denver, CO 80261-0009

Letters & Protests

U.S. Postal Service First Class Mail

Colorado Department of Revenue
Fee Unit
P.O. Box 17087
Denver, CO 80217-0087

Express Mail Delivery (DHL, FedEx, UPS, USPS Priority, etc.)

Colorado Department of Revenue
Fee Unit
1881 Pierce St.
Entrance B
Lakewood, CO 80214