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:

  • 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

  • Stay up to date on the latest information on the city’s response to the corona virus outbreak for businesses here: COVID-19 Business Resources.

  • 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 for assistance.

  • 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

  • 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 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.