Contact Us By Phone

Call the Taxpayer Helpline

(303) 238-7378

Taxpayer Service Representatives are available (except on state holidays)

Monday through Friday, 8:00 a.m. to 4:30 p.m.


Hearing or Speech Impaired Relay Services

Text Telephone (TTY) Icon To use this service, dial the appropriate number below. Give the Relay Colorado agent the number that you would like to call. The Relay Colorado agent will stay on the line to relay the information/conversation to you.
  • TTY Telephone Users: 1-800-659-2656
  • Voice Telephone Users: 1-800-659-3656

Other Contact Phone Numbers