Cook County, IL property tax
Tax year 2025 · updated 2026-09-20 · Source: Census ACS 2023 5-year, Cook County Assessor
The median effective property tax rate in Cook County is 1.93%, below the Illinois median of 2.07% and above the national median of 0.99%. The median homeowner pays $5,330 a year. Bills are first installment March 1 (55% of prior year); second installment August 1, frequently delayed.
- Effective rate
- 1.93%
- Median annual bill
- $5,330
- Median home value
- $276,000
- Appeal deadline
- About 30 days after the township reassessment notice; Board of Review appeal follows
Estimated annual bill by home value
| Home value | Estimated bill | Per month |
|---|---|---|
| $200,000 | $3,860 | $322 |
| $300,000 | $5,790 | $483 |
| $400,000 | $7,720 | $643 |
| $500,000 | $9,650 | $804 |
| $750,000 | $14,475 | $1,206 |
| $1,000,000 | $19,300 | $1,608 |
Exemptions in Cook County
| Exemption | What it does |
|---|---|
| Homeowner exemption | $10,000 off equalised assessed value, roughly $300 to $1,000 off the bill depending on local rate. |
| Senior and senior freeze | $8,000 senior exemption plus an assessment freeze for households under the income limit. |
Illinois statewide: General homestead exemption of $10,000 in Cook County and $6,000 elsewhere off equalised assessed value; senior, senior freeze and disabled exemptions add to it.
Due dates and payment
First installment March 1 (55% of prior year); second installment August 1, frequently delayed.
Appealing your assessment
About 30 days after the township reassessment notice; Board of Review appeal follows. Appeals are filed with the Cook County Assessor. Bring recent sales of comparable homes, photos of condition issues, and any error in the record (square footage, lot size, features). 30 days from the township assessment notice; a second appeal to the county Board of Review follows.
How Illinois assesses value
33.33% of market value statewide; Cook County uses 10% for residential, then a state equalisation factor is applied.
Sources: Census ACS 2023 5-year, Cook County Assessor; Illinois Department of Revenue, Census ACS 2023 5-year.
Frequently asked questions
What is the property tax rate in Cook County, IL?
The median effective rate in Cook County is 1.93% of home value, below the Illinois median of 2.07%. The median bill is $5,330 on a median home value of $276,000.
When are Cook County property taxes due?
First installment March 1 (55% of prior year); second installment August 1, frequently delayed. Bills are issued by the county tax office; assessments come from the Cook County Assessor.
How much is property tax on a $400,000 house in Cook County?
About $7,720 per year at the median effective rate of 1.93%, before exemptions. Your exact bill depends on the city, school district and special districts that serve the parcel.
What is the deadline to appeal a Cook County assessment?
About 30 days after the township reassessment notice; Board of Review appeal follows. File with the Cook County Assessor; see the appeals section above for what to bring.