Coronavirus Disease 2019 (COVID-19) in Colorado: State & National Resources

Contact Us By Phone & Fax

Before you call, we encourage you to try one of these self service options:

Revenue Online Help          Where's My Refund           How-To Videos


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

Send Us a Fax

Did you know you can fax the Department? You can send a wide variety of forms to the following dedicated teams: