Boulder County property tax calculator 2026
This calculator provides an estimate of property tax in Boulder County based on assessed value and a combined mill levy. Property taxes are determined by local taxing districts, so total rates can vary by location within the county.
Estimates only. Loan terms and approval depend on lender underwriting.
Many U.S. counties use multiple local taxing authorities (county, city, school district, special districts). Enter your combined local millage rate as shown on your annual property tax notice.
Estimated property tax
Enter the assessed value to see the estimated annual property tax.
How it works
To estimate property tax in Boulder County, you enter the property’s assessed value. Local taxing entities such as the county, municipalities, school districts, and special districts each adopt mill levies. The combined mill levy for the applicable tax area is applied to the assessed value to estimate property tax.
Examples
If a property has an assessed value, the estimated tax is calculated by multiplying that value by the combined mill levy for the property’s tax area.
Limitations and important notes
This is an estimate only. Actual property tax amounts depend on the parcel’s official assessed value, applicable exemptions, and the combined levies adopted by each taxing authority serving the property.
FAQs
What value should I enter for Boulder County property tax estimates?
Enter the property’s assessed value. This is the taxable value used with the combined mill levy to estimate property tax.
Why does the mill levy differ within Boulder County?
Mill levies vary because properties are located in different combinations of county, municipal, school, and special taxing districts.
Is this the same as my official tax bill?
No. This calculator provides an estimate only. Official tax bills are issued by the Boulder County Treasurer using certified values and rates.
Are exemptions included in this estimate?
No. This estimate assumes the assessed value is entered without exemptions or adjustments applied.
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Calculations are simplified and for guidance only. Always double-check results and current rules with official sources or a qualified professional before making financial decisions.