COVID-19 Updates
Tax filing extension information, closures and other updates related to COVID-19. Learn more >
Alternative Process of Service
You may serve your legal documents on the Department during the office closure to the public. More information >
2020 Retail Sales Tax Return is Available
The DR 0100 has changed for the 2020 tax year. See what has changed...
SOVOS is No Longer Providing Juris Codes in the Free Lookup Tool
CDOR has free tools to look up jurisdiction codes. Learn more >
TABOR Refunds
What do Coloradans need to know about TABOR this year? Learn more >
Taxpayer Identity Verification
Did you receive an "Action Needed Letter" from the Department? Here is what you should do next...
Need extra help with your income tax return?
Many community groups and nonprofit organizations offer filing assistance for Coloradans. Learn more...
Sales Tax Non-Filer Notices
If you received a notice about not filing your sales tax return, here are your next steps....
Did You Receive a Letter From Us?
Review this FAQ to find out next steps.