All State Offices will be closed on Monday, October 2, in observance of Frances Xavier Cabrini Day.


File Sales Tax Online

There are a few ways to e-file sales tax returns: 

If you cannot file through Revenue Online or another electronic method, please download the form you need. Beginning with sales on January 1, 2018, the Colorado Department of Revenue (CDOR) will be requiring ALL Colorado sales tax licensees to report and pay sales tax to the penny, regardless of filing format.

Sales Tax Services in Revenue Online

Login Required

  • File/amend sales tax returns
  • File XML or Excel spreadsheet electronic returns for a business with multiple locations
  • View payment history
  • View account balances
  • View letters from the Department
  • Update your account mailing address
  • Close a business tax account
  • File a protest
  • Set up Third Party access to your tax account 

No Login Required

  • Verify a Colorado sales tax license (Instructions below) 
  • Check county and city sales tax rates (Instructions below)
  • Verify the sales tax rates at a specific location(s) 
  • Obtain a rate chart for a specific tax percentage 
  • Find tax rates by address
  • Make a payment
  • File special event sales tax returns (Instructions below)
  • Add Power of Attorney

How-To Videos

How to File a Sales Tax Return in Revenue Online

How to File a Special Event Sales Tax Return

How to Set Up a Business Revenue Online Account

Out-of-State Retailer Registration

How to Add Non-Physical Sites in Revenue Online

How to Verify a Sales Tax License


Username Recovery & Password Reset

How to Amend a Colorado Retail Sales Tax Return

Requesting a Letter ID

How to Renew Your Sales Tax License