• Visit for more information on holiday hours

  • What do Coloradans need to know about TABOR this year?

    The 2019 TABOR Refund will be distributed in two parts: a temporary income tax rate reduction and a local property tax exemption reimbursement. Learn more here.  

  • Sales Tax Changes

    What do businesses need to know about Colorado's new sales tax law?

    Sign up here to get tax email updates. Click here to view a copy of the new law, HB19-1240. 

Our Motto is Always Help

Our mission is to promote voluntary compliance with all tax laws through information, education, assistance and customer service.
 
Link to Revenue Online Troubleshooting Information     Link to Phone Number for the Taxpayer Helpline     Link to Email Alert Sign Up Page     Link to CDOR Customer Service Survey Forms

Top Tax Training Videos

How to Add a Non-Physical Site for Sales & Use Tax in Revenue Online

Revenue Online Log-In Troubleshooting - Browser Authentication

Taxation News

It's Time to Renew Your Sales Tax License

All Colorado sales tax licenses will expire on December 31, 2019.

Make an EFT Payment

Click the link above to initiate an electronic funds transfer through PayConnexion. 

Sales Tax Non-Filer Notices

If you received a notice from the Department about not filing your sales tax return, you have a few options.

Did You Know that 84% of Taxpayers Submit their Return Electronically? 

Revenue Online is the Department's electronic filing system and it is free to use.

Did You Receive a Letter From Us? 

Review this FAQ to find out next steps.

Request a Payment Arrangement

Log into your Revenue Online account or call the Collections Team at (303) 205-8291. Our agents will set your monthly payment amount in consideration of the total amount of tax debt owed.