Contact Us by Email, Phone and Fax
Secure Messaging via Revenue Online- Revenue Online remains the fastest, safest and most secure way to communicate with the Colorado Department of Revenue - Taxation Division; however, representatives are not available for immediate assistance.
Main Phone Number: 303-238-7378
Main Fax Number: 303-205-1377
Phone: 303-205-6848 or 303-205-6879
Fuel Tax (fuel excise, IFTA, aviation sales tax, exempt fuel, passenger mile tax)
Sign Up for Tax News and Updates by Email
Subscribe to our free email subscription service to receive notifications when new tax information is available. With a subscription, you automatically receive updates without having to return to the website and check for changes. Email updates are a free service provided by CDOR. Your email address will only be used to deliver the information you've requested.
Please select one (or more) from the list below and follow the sign up prompts. Return to this page to sign-up for more than one list.
- Charitable Organizations (updates related tax law/filing/processes)
- Construction Contractors (updates related tax law/filing/processes)
- Corporation and Partnership Tax
- Excise Tax
- Hospitality Industry (updates related tax law/filing/processes)
- Individual Income Tax
- International Fuel Tax Agreement (IFTA)
- Legislation (updates related tax law/filing/processes)
- Marijuana Tax
- Sales Tax
- Tax Policy, Rules & Regulations
- Tax Professionals
- Use Tax
- Wage Withholding Tax
Contact Us by Mail
Check the letter you received or your form for the correct mailing address first! Be advised that sending without proper postage or via certified mail may delay the arrival of your mail, which may cause due dates to be missed.
Do not combine correspondence, payments or forms. Each requires special handling and must be routed to the proper address. Please note these addresses and zip codes are exclusive to the Colorado Department of Revenue, so a street address is not required.
Section or Employee Name and Room #
PO Box 17087
Denver CO 80217-0087
1375 Sherman Street
Denver CO 80203
Denver CO 80261-0004
Service Center Locations
When visiting our offices, it is important to note that you should bring your government-issued photo ID or driver license. At this time, our office staff cannot accept cash or credit card payments. All hand-delivered payments must be made with a check or money order, or to release a garnishment, a certified check.
2447 N. Union Blvd.
Colorado Springs CO 80909
3030 S. College Ave.
Ft. Collins CO 80525
222 S. 6th St., 2nd Floor
Grand Junction CO 81501
827 W. 4th St., Suite A
Pueblo CO 81003
(Inside the DMV)
The Governor’s Office of Constituent Services ensures each State Department has a Citizen Advocate. The Citizen Advocate is different from a Taxpayer Advocate in that they can assist in all divisions with the Department of Revenue including Enforcement, Lottery, Motor Vehicle and Taxation. The advocate helps navigate concerns to Revenue management when normal methods for resolving issues or disputes have been ineffective. Concerns are tracked to ensure a prompt response. Rules, regulation and statute can sometimes limit outcomes; however, the advocate will provide specifics. We are restricted from providing any legal advice. If this is your first attempt to resolve a problem, please use one of our other contact methods listed above. The advocate will coordinate and facilitate a resolution with the appropriate division, generally within three working days.