Illinois Property Tax Appeal Guide
An estimated 55% of homes in Illinois may be overassessed. Use our free calculator to check your assessment and learn how to appeal.
Avg Tax Rate
2.10%
Median Home Value
$280,000
Assessment Cycle
Every 3 years (Cook County triennial), every 4 years (most others)
Overassessed Homes
55%
How to Appeal in Illinois
Appeal Window
30 days after publication (varies by county)
Appeal Process
Complaint to Board of Review, then PTAB or circuit court
Illinois Property Tax Calculator
Location
Assessment
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Home Details
Condition
Enter your property details to see if you're overpaying on property taxes.
Counties in Illinois
Cook County
Tax Rate: 1.95%
Median: $335,000
Deadline: 30 days after publication
DuPage County
Tax Rate: 2.30%
Median: $350,000
Deadline: 30 days after publication
Lake County
Tax Rate: 2.80%
Median: $310,000
Deadline: 30 days after publication
Will County
Tax Rate: 2.70%
Median: $280,000
Deadline: 30 days after publication
Kane County
Tax Rate: 2.80%
Median: $275,000
Deadline: 30 days after publication
McHenry County
Tax Rate: 2.90%
Median: $280,000
Deadline: 30 days after publication