www.Colorado.gov, Colorado's Official Web Site
Colorado Department of Revenue: Taxation Division
1375 Sherman St. Denver, CO 80261
Fees
In addition to the payment amount, each online transaction is subject to a processing fee that covers the cost associated with providing this service online.

For online transactions there is a portal administrative fee approximately equal to 2.25% of the total amount charged plus $0.75 per transaction. If you choose to pay with cash via a debit to your checking account (eCheck) there is a discount of the portal administrative fee to a total of $1.00. Please note that some services do not offer the eCheck payment option. Click here to see the formula used to calculate the portal administrative fee.

You will have the opportunity to review all applicable fees prior to finalizing your transaction. At that point, you will have the option to cancel your online transaction and pay your taxes using a traditional, offline method.
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