Property Tax Analysis · Cook County, IL · Tax Year 2025
9665 S JEFFERY AVE
CHICAGO, IL 60617
TAX YEAR 2025 · CCAO
Verdict · Your Property Tax May Be Too High
~$15,000
above your recent purchase price.
Your property was assessed above your April 2023 purchase price of $40,000 — strong direct evidence for a Board of Review appeal.
Recommended next step
Lower your tax bill — Ownwell handles everything.
No upfront cost — you only pay if you save.
Ownwell's experts gather evidence, file your appeal with the Cook County Board of Review, and represent you at the hearing.
The evidence
This property was purchased for $40,000 in April 2023 — an arm's-length market transaction that directly benchmarks the assessment.
SOURCE: COOK COUNTY ASSESSOR'S OFFICE · 2025 CERTIFIED DATA
Fair cash value = certified assessed value × 10 (Illinois law: residential properties assessed at 10% of FCV).
What it means
In plain terms: your home was assessed above what you paid for it — direct evidence that your tax bill is too high.
Your property was assessed above what you paid for it in 2023. A documented purchase price is strong evidence to bring to a Board of Review hearing — assessors give significant weight to arm's-length market transactions.
The deadline
2025 Board of Review windows are open
Appeal windows vary by township, March–November 2026. Find your township's open window at cookcountyassessor.com. Not sure when your township's window is open? Ownwell monitors your property year-round and files when your window opens.
Prefer to handle it yourself? I'd rather file with the CCAO →