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Your Guide to the Boulder Online Tax System

The Boulder Online Tax System offers enhanced user experiences and tax compliance functionality to city businesses, including the ability to:

  • Complete a Business License application or register for a Special Event License
  • File online tax returns with electronic payment options
  • Sent direct messages to Sales Tax Staff
  • View and print previously filed returns
  • Manage account logins online, including the ability to manage access for third-party tax preparers and to manage access for each tax type.
  • Change location and mailing addresses online.
  • Amend returns and request refunds online.
  • Renew a Business License
Calculator and Paperwork with Pen on Table

Navigating the Boulder Online Tax System

Access and find resources about the Boulder Online Tax System below, including how-to videos and PDF guides. If you need additional assistance please call 303-441-3050 or e-mail us at: salestax@bouldercolorado.gov.