Colorado Property Taxes Explained

Updated: Feb 12

In Colorado there are two factors in calculating property taxes:

  1. The assessment rate is set by the state and is currently 7.15% for residential property and 29% for commercial and vacant land. Exciting changes to these rates are coming for the 2022 tax year (taxes paid in 2023)!

  2. The mill levy is the sum of the tax rates levied by local taxing authorities (county, town, school district, water district, fire district, etc). Mill rates are set at the end of each tax year and are determined based on the amount of money each taxing authority will need to provide necessary services the following year. Mill rates can be changed with voter approval.

How do those two factors affect my taxes?

To calculate property taxes, a home's actual value is multiplied by the state residential assessment rate of 7.15% to get the assessed value. The assessed value is then multiplied by the local mill levy to reach the amount of taxes due. Let's do math to demonstrate! For this example I'm using my local mill levy which is for tax area 3, Breckenridge proper. $1,000,000 actual value X 0.0715 state assessment rate = $71,500 assessed value $71,500 assessed value X 0.057105 local mill levy for tax year = $4,083 taxes due -or- Multiply the two factors and convert the product to a percentage to get the Effective Tax Rate. Then apply that to the actual value of the home: 0.0715 assessment X 0.057105 mills = 0.00408301 X 100 = 0.408% Effective Tax $1,000,000 actual value X 0.408% Effective Tax Rate = $4,080 taxes due

What's all this actual and assessed value jargon?

How does the Assessor's Office figure the actual value of my property?


  • 68.645 is the average mill levy for tax year 2021 in Summit County

  • 66.878 was the average mill levy for tax year 2020 in Summit County

  • Mill is derived from the Latin word millesimum meaning thousandth, which is why the decimal is moved 3 places to the left.

  • Colorado is ranked as having the 3rd lowest residential property tax rate in the country. Hawaii has the lowest.

Want to learn more about the mill levy for your tax area?

Check out the 2021 Property Tax Table to see each tax area's mill levy in Summit County and the corresponding effective tax rate.

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