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New Online Sales Tax Software

The City of Boulder’s new Tax and Revenue Management System is live!

Dear Taxpayer,  

Mitigating the potential spread of COVID-19 to ensure the health and well-being of our staff and community is fundamental to providing service excellence. That is why, beginning today, the City of Boulder is implementing several precautionary social distancing measures. Please note the following important updates:  

  • 1. The Sales Tax building will be closed to the public until further notice. However, staff will be working between the hours of 8am and 5pm Monday through Friday and will continue to respond to voicemails and emails in the order in which they are received. For faster service, please contact us via email at [email protected]. 

  • 3. If you have not done so already, please create a web logon for Boulder Online Tax at Once online, you can file and pay your taxes, amend returns, add/cease locations, and more. In order to create a web logon, you will need a letter or tax return with your new eight-digit Account Number and a Letter ID. If you do not have this letter, please contact Sales Tax staff at [email protected] for assistance. 

  • 5. Taxpayers may find that check payments mailed to PO Box 791 do not clear your bank account as quickly as normal. For faster deposit times, please make sure that payments are mailed to the address below, or pay online at 

City of Boulder Sales Tax 

Dept 1128 

Denver, CO 80263-0001 

6. Payments postmarked on or before the 20th of the month will be considered timely and will not be assessed penalties and interest.  

  •  If you are unable to pay online or mail a check, please contact Sales Tax staff at [email protected] to make alternate arrangements. Please keep in mind that taxes paid to a vendor or retailer are public monies held in trust for the sole use of the City of Boulder. Please ensure that you are remitting these monies on or before the due date on your tax return.

As part of the implementation planning process, Finance staff has been reviewing the revenue code, city manager’s rule regarding business licensing, and other processes related to the administration and collection of sales and use taxes. Several changes were adopted to better align with government best practices, the city’s resilience strategy, and the city’s climate commitment.

New  - City Manager Rule Defining Postmark Date as Proof of Timely Filed and Paid pdf

For the purposes of determining penalties and interest, timely remittance of a return and payment may be evidenced by the postmark date if mailed. Section 3-2-4, "Vendor Liable for Tax,"B.R.C. 1981

New  - City Manager Rule Establishing Minimum Requirements for an Application for a Sales and Use Tax License (Business License) or Exempt Institution License pdf

Any statement on a license application that is later found to be incorrect, false, misleading, or incomplete, shall be considered cause to revoke the license. Chapter 3-17, "General Provisions for Tax Compliance," B.R.C. 1981