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
- EFT/Electronic Payment Help: 303-205-8333
- Collections: 303-205-8291
- Bankruptcy: 303-866-3711
- Discovery: 303-205-8292
- Field Audit: 303-355-0400
- Report Tax Evasion, Fraud or Scams: 303-205-8262
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