Cook County · Illinois (IL)
How to Appeal Your Property Tax Assessment in Cook County
File an appeal with the County Board of Review (or the Cook County Assessor for Cook County) within 30 days of the assessment notice.
Chicago and suburbs. Largest county assessment office in the US. Township-based filing windows.
Filing Deadline
Varies by township (spring-fall)
Appeals Body
Cook County Board of Review
Assessor Website
assessor.cookcountyil.govGenerate Your Cook County Appeal Letter
Answer 3 questions, pick comparable properties, download your Cook County Board of Review-ready letter. Only pay when you are happy with the result.
Start Your AppealInstant download
Filing Steps for Cook County
1. Gather comps
Find 3-5 comparable properties in Cook County assessed lower per square foot than yours. Use the county assessor's public records or property sites.
2. File your protest
Submit your protest to the Cook County Board of Review by Varies by township (spring-fall). Include your evidence and this letter.
3. Attend your hearing
Present your case. Most hearings take 10-15 minutes. Many are resolved informally before the formal hearing date.
Other Counties in Illinois
Deadlines and procedures change. Always verify with the Cook County Board of Review before filing. This is not legal advice.