Contact Us

Call the Taxpayer Help Line: (303) 238-7378

  • Taxpayer Service Representatives are available Monday through Friday, 8:00 a.m. to 4:30 p.m.

Other Contact Phone Numbers

Hearing or Speech Impaired: Relay Colorado

To use this service, dial the appropriate number above. 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



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