Colorado State, state-collected and self-collecting home-rule jurisdictions’ sales and use tax rates are generally updated twice a year.  The Colorado Department of Revenue (DOR) lists all the rates on the DR1002 form, but be sure to check for the most recent version.

The changes effective January 1st, 2021 are listed in the DOR’s memo below:

Self-collecting home-rule jurisdiction change: Currently there are 71 self-collecting home-rule cities in Colorado, but that number will be 70 for 2021. Cañon City will drop it's self-collecting home-rule status and become a state-collected jurisdiction effective...

The Colorado Department of Revenue still offers online filing through its Revenue Online portal, but their new "SUTS" portal also allows for filing of sales tax returns for the State and state-collected jurisdictions.  It also allows for filing sales tax and use tax...

The home-rule municipalities in Colorado have self-governance taxing authority and they too are adopting Economic Nexus and Marketplace Facilitator municipal codes.