Contact Us By Mail

Correspondence - 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


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.
 

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

104, 104CR, 104PN, 104X
105
106, 106CR, 107
112, 112C, 112CR, 112SF, 112X
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 108
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