Cook County Property Tax Calculator (2026)
The Cook County median effective property tax rate is 1.73% for 2026 (U.S. Census Bureau ACS 2024), 0.28% below the Illinois median of 2.01%. On a $400,000 home that is about $6,920 a year (~$577 a month). Cook County property is assessed by the Cook County Assessor's Office. Enter your home value below for an instant estimate.
What is the Cook County property tax rate in 2026?
Cook County's median effective property tax rate is 1.73% (U.S. Census Bureau ACS 2024). The county median home is $324,500 with a median tax of about $6,191.
How much is property tax on a $400,000 home in Cook County?
About $6,920 a year, or roughly $577 a month, at the 1.73% median effective rate before exemptions.
Who handles property tax in Cook County?
The Cook County Assessor's Office sets your assessed value. The Cook County Treasurer collects the bill. Appeal by By township — file with the Assessor within 30 days of your reassessment notice.
When are Cook County property taxes due?
Two installments: the first is due March 1 (set at 55% of the prior year's total bill) and the second is due in late summer (historically around August 1), when final local rates are known.
Cook County Property Tax Calculator (2026)
Rates updated 2026 (U.S. Census Bureau ACS 2024). Live estimate — county median effective rate.
Cook County's median effective property tax rate is 0.28% below the Illinois median and the US average is 0.94%. Your assessed value, local millage, and exemptions (homestead, senior, veteran) will change the actual bill.
Who assesses and collects property tax in Cook County?
In Cook County, the Cook County Assessor's Office sets the assessed value of your home each year. The Cook County Treasurer issues the bill and collects payment. Assessment appeals are heard by the Cook County Board of Review.
For your exact rate, exemptions, and account details, go to cookcountyassessoril.gov — the official source for Cook County. This page is an independent estimate, not a tax bill.
How much is property tax on a home in Cook County?
At the Cook County median effective rate of 1.73%, here is the estimated annual and monthly bill by home value. The county median home value is $324,500, with a median tax of about $6,191 a year.
| Home value | Rate (1.73%) | Annual tax | Monthly |
|---|---|---|---|
| $200,000 | 1.73% | $3,460 | $288 |
| $400,000 | 1.73% | $6,920 | $577 |
| $324,500 (county median) | 1.73% | $6,191 | $516 |
| $750,000 | 1.73% | $12,975 | $1,081 |
When are Cook County property taxes due, and when can you appeal?
Assessment (lien) date: January 1. Triennial — each township is reassessed once every three years (City of Chicago, north suburbs, and south/west suburbs on a rotating schedule).
Payment: Two installments: the first is due March 1 (set at 55% of the prior year's total bill) and the second is due in late summer (historically around August 1), when final local rates are known.
Appeal window: By township — file with the Assessor within 30 days of your reassessment notice, then optionally with the Board of Review when your township's window opens. Missing it usually means accepting the assessed value for the year.
What exemptions can lower your Cook County property tax?
| Exemption | Amount or rule |
|---|---|
| Homeowner (general) Exemption | $10,000 EAV reduction on a primary residence |
| Senior Exemption (65+) | additional $8,000 EAV reduction |
| Senior Freeze (low-income 65+) | freezes the EAV; total household income must be $65,000 or less |
| Persons with Disabilities / Veterans with Disabilities | $2,000 EAV (disability) and tiered veteran reductions up to a full exemption |
Amounts and eligibility change over time and are administered locally, so confirm what you qualify for with the Cook County Assessor's Office before relying on a figure.
How do you estimate your Cook County property tax by hand?
- Find your home's assessed value on your latest notice from the Cook County Assessor's Office.
- Subtract any exemptions you qualify for, such as homestead, senior, or veteran relief.
- Multiply the remaining taxable value by your local combined tax rate.
- For a quick estimate, multiply your home value by 1.73% — the Cook County median effective rate used above.
Which cities are in Cook County, and what makes it different?
Cook County includes Chicago, Evanston, Cicero, Schaumburg, Skokie, Berwyn, Oak Park, Palatine, among others. Rates differ between these cities and their school and special districts, so two homes of equal value can owe different amounts.
Cook County uses a triennial reassessment cycle and a two-step appeal — first the Assessor, then the elected Board of Review. Exemptions are subtracted from the Equalized Assessed Value (EAV), not the tax directly, so their dollar value depends on the local tax rate. Cook's effective rate is among the highest of any large U.S. county.