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

Revenue Online. After you create your own User ID and Password for the income tax account, you may file a return through Revenue Online. If you have more than one business location, you must file a separate return in Revenue Online for each location. For additional e-file options for businesses with more than one location, see Using an Approved Sales Tax Software or Multiple Location Filers below.
Using an Approved Sales Tax Software Vendor.
Multiple Location Filers that do not use approved software: See the Sales Tax Spreadsheet Filing page.
Software Developers - Sales Tax XML

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	No 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 a Third Party access to your tax account	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

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How to File a Sales Tax Return in Revenue Online

How to File the Colorado Retail Sales Tax Return (DR 0100) using Revenue Online for filing periods beginning on January 1, 2020 and after. To watch the YouTube Video on Filing DR 0100, click here.