Contact Us By Phone
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. MT. Language translation service is available over the phone. Request this service once connected to a Taxpayer Service Representative.
Dedicated Phone Support
- EFT/Electronic Payment: 303-205-8333
- Sales & Use Tax System (SUTS) Support: 720-795-7759
Tax Unit Contact Phone Numbers
- Bankruptcy: 303-866-3711
- Collections: 303-205-8291
- Collections Hours of Operation:
- Monday-Thursday from 8:00 a.m. to 4:30 p.m.
- Friday 9:00 a.m. to 4:30 p.m.
- Collections Hours of Operation:
- Compliance: 303-866-3711
- Discovery: 303-205-8292
- Excise Tax Unit (Cigarette, Liquor, Nicotine, Marijuana, and Tobacco Products): 303-205-8287
- Field Audit: 303-692-7912
- Fraud and Tax Evasion: 303-205-8262
- Fuel Tax Unit (Fuel & IFTA): 303-205-8205
- Special Event Sales Tax: 303-866-5643
Schedule a Call From Taxpayer Services
Taxpayer Helpline Call Scheduler:
Please add our Taxpayer Services number (303) 238-7378 as a recognized contact in your phone or other electronic device to prevent spam filtering of your scheduled call. To schedule a call with the Taxpayer Helpline Call scheduler, use the button below to schedule a time for Taxpayer Services to call you directly. You can expect a call within 10 minutes of your scheduled appointment time.
Include in the message:
- Name
- Phone Number - must be a 10 digit US based phone number. We are unable to call international numbers.
- Colorado Account Number or Letter ID (if you have it)
- Tax Type (Individual Income Tax, Sales Tax, Withhold Tax, etc.)
Hearing or Speech Impaired Relay Services
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