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Contact Us By Mail

 

 

Correspondence & Payments

Letters & Protests

U.S. Postal Service
Colorado Department of Revenue
Section or Employee Name and Room Number
P.O. Box 17087
Denver, CO 80217-0087
 
Express Mail Delivery (DHL, FedEx, UPS, etc.)
Colorado Department of Revenue
Section or Employee Name and Room Number
1375 Sherman Street
Denver, CO 80203
 

Tax Payments

Be sure to include the payment form/voucher and mail payments to:

Colorado Department of Revenue
Denver, CO 80261-0004

Citizens' Advocate

If this is your first attempt to resolve a concern, please call the Taxpayer Services Helpline.

If you still have questions after speaking with the Taxpayer Services Team and any applicable Taxation Units, the Citizens' Advocate may be able to help.

Submissions sent through the mail take 4-6 weeks to be processed. Applicable interest and penalties will still accrue while your written submission is in process.

For faster response, please complete the Citizens' Advocate Contact Form on the Advocate web page to provide the Advocate with the information needed to begin the process.

If mailing your concern, please provide a detailed written account of your concern and photocopies of any supporting documentation. Also, be sure to include your full name/business name, contact information, and Colorado Account Number (CAN) in your submission. The mailing address for the Advocate is:

Citizens' Advocate Office
P.O. Box 17087
Denver, CO 80217-0087

 

Please note the following when sending mail to the Colorado Department of Revenue:

Certified Mail, Express Mail & Courier Services

Although these mailing methods give the option to receive proof of delivery, sending forms or payments by certified mail, express mail or a courier service may delay processing. Sending forms and payments by first class standard mail via the U.S. Postal Service ensures the fastest processing time.

Proper Postage on the Envelope

The U.S. Postal Service will not deliver mail without the proper postage. If you mail correspondence, forms or payments without proper postage, it will be returned to sender. This is especially important for those filing on or very near filing deadlines. Taxpayers can save on postage by filing electronically through our Revenue Online.

Addressing the Envelope

Zip Code
The zip code 80261 is exclusive to the Colorado Department of Revenue. As a result, a street address or box number is not required when mailing forms or payments to 80261 via USPS First Class Mail. Be sure to add the zip code + 4 digits (80261-XXXX) to ensure proper delivery and payment processing.
Double Check the Mailing Address
Be sure to check the letter you received or your tax form for the correct mailing address first! If there is an address noted, be sure to send your correspondence and/or payment to the address on the form or letter.

Zip Code Information

Commonly Used Zip+4 Codes

Income Tax
Use the following Zip+4 numbers to get returns and payments routed to the correct tax office within the Department:
 
Form Address

DR 0104, 0104CR, 0104PN, 0104X
DR 0105
DR 0106, 0106CR, 0107
DR 0112, 0112C, 0112CR, 0112SF, 0112X
DR 0617
DR 1778

If you are submitting the form with a check or payment:
Colorado Department of Revenue
Denver, CO 80261-0006
 
If you are submitting the form without a check or payment:
Colorado Department of Revenue
Denver, CO 80261-0005

DR 104BEP
DR 0108
DR 0158-C,DR 0158-F,DR 0158-I,DR 0158-N
DR 0900,DR0900C,DR0900P

Colorado Department of Revenue
Denver, CO 80261-0008
All other income tax related forms
Colorado Department of Revenue
Denver, CO 80261-0008
Notice of deficiency, tax protests, delinquent tax payments
Colorado Department of Revenue
Denver, CO 80261-0004

 

Other Zip+4 Options

Use the following Zip+4 numbers to get returns and payments routed to the correct tax office within the Department:
80261-0004

Notice of deficiency, tax protests, delinquent tax payments

80261-0009
Withholding tax, annual withholding reconciliations and miscellaneous business and excise taxes (e.g., liquor, cigarettes, tobacco, fuel, heavy truck sales, aviation, prepaid wireless E911 surcharge)
80261-0013
Sales tax, use tax, county lodging, county short term rental, local marketing district tax, rural transportation authority