Resources for Local Governments

Local Government

Local Government Information

Electronic Address Database Certifications Expired June 30, 2021

The Geographic Information System (GIS) allows businesses to look up the specific sales tax rate for an individual address. The GIS not only shows state sales tax information, but it also includes sales tax information for counties, municipalities, and special taxation districts. This system allows for a complete tax rate to be determined so the correct tax is collected from customers in real-time. For more information, please reach out to Local Government Support via email at

New Tax or Tax Rate Change for a County, Municipality or Special District

It is very important local governments consult and work with the Colorado Department of Revenue well in advance as they plan for new, increased, decreased or extended sales or use tax rates.

Visit our Information for Local Government or Entities Implementing a New Tax or Changed Tax Rate page for more information. Tax rate changes administered by the State of Colorado, Department of Revenue become effective either January 1 or July 1.

Ordinances and resolutions are adopted 90 to 120 days prior to an election. Most elections take place in the spring and fall each year. Election dates are governed by TABOR (Taxpayer Bill of Rights) in Section 20 of Article X in the state constitution.

Please contact the Department by email at at the time you develop your ordinances and resolutions for proposed tax rate changes.

Uniform Sales/Use Tax Base Research Project

Implementation of Colorado House Bill 2013-1288: Recommendations Report Regarding Uniform Sales and Use Tax Base

Final Report - Uniform Sales and Use Tax Base Throughout the State (posted January 2014)