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Call Us With Your Tax Matters: 

(303) 238-SERV (7378)

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

Get Current Year Income Tax Forms by Mail
(303) 238-FAST (3278)

Income Tax Account and Refund Information:
(303) 238-FAST (3278)

Hearing or Speech Impaired:  Relay Colorado

• TTY Telephone Users: 1-800-659-2656
• Voice Telephone Users: 1-800-659-3656

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.

TeleFile (Individual Income Tax)

EFT/Electronic Payment Help : (303) 205-8333

Sales Tax Exemption Certificate Verification and Tax Rates:  (303) 238-FAST(3278)

Fuel Tax/IFTA Helpline:  (303) 205-8205

Tax Auditing and Compliance: (303) 866-3711 

Office Collections: (303) 205-8291

Fair Share: (303) 205-8292

Report Tax Evasion or Fraud:  (303) 205-8262