Contact Us

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.


Other Contact Options 

                    Visit for information on Taxpayer Service Centers                 Visit for More Contact Phone Numbers                Visit for Citizens' Advocate Office Information

                    Visit for more information on how to contact us by mail                Visit for more information on how to contact us by email                Link to Speaking Request Form


Hearing or Speach 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