Illinois · Cook County
Cook County property tax appeal
Chicago and suburban Cook County homeowners appeal their assessment by township — first with the Cook County Assessor, then the Board of Review. Filing yourself is free. Here's everything in order.
Look up your property
Enter your Cook County address or 14-digit PIN.
- 1
Check your home free
Compare your assessment with similar nearby homes using public Cook County records.
Use the free check below - 2
See your township deadline
Appeal windows open by township with the Assessor, then the Board of Review.
View deadlines - 3
Get the $79 appeal kit
Run the free check first — if your home looks over-assessed, the kit offer appears with your comparables built in.
Start with the free check - 4
File it yourself
Our step-by-step filing walkthrough opens the official Assessor form next to your kit's numbers.
Open filing walkthrough
NeighborComp is a private company, not affiliated with the Cook County Assessor, Board of Review, or any government office. Not legal advice.