Cook County property tax calculator 2026
This calculator provides an estimate of annual property tax for real estate located in Cook County, Illinois. Results are based on assessed value and a combined local property tax rate that reflects overlapping taxing districts.
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
Property tax in Cook County is calculated using a classified assessment system. The assessor determines a market value and applies a class-specific assessment level. The assessed value is then equalized at the state level to produce equalized assessed value (EAV). Local taxing districts certify levies, and the County Clerk computes a rate for each district by dividing the levy by total adjusted EAV. All applicable district rates are added together and applied to the parcel’s EAV.
Examples
If a property has an assessed value input that already reflects equalization and exemptions, the calculator multiplies that value by a combined local property tax rate. Because rates differ by municipality, school district, and special districts, the same assessed value can result in different estimated taxes across Cook County.
Limitations and important notes
This tool produces an estimated property tax only. Cook County rates vary materially by parcel, and exemptions depend on eligibility and filing status. Special assessments, voter-approved bonds, and changes in equalization or levies can affect the final tax bill.
FAQs
Does Cook County use a single property tax rate?
No. Property tax rates in Cook County vary by parcel because they are the sum of multiple taxing district rates that apply to a specific location.
What value should I enter for the calculation?
Use the assessed or equalized assessed value shown on your assessment notice or tax bill, after applicable exemptions.
Are homeowner and senior exemptions included automatically?
No. Exemptions depend on eligibility and must be applied to the assessed value before using this estimator.
Will this match my actual tax bill?
No. This is an estimate intended to illustrate how Cook County property tax is calculated; actual bills may differ.
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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.