Assessed Value vs Market Value: What Cook County Homeowners Need to Know
Want to know if your assessment is too high? Check your property free →
The full guide: Assessed Value vs Market Value: What Cook County Homeowners Need to Know →
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How does Cook County determine my property’s assessed value?
The Cook County Assessor uses an automated "mass appraisal" system that can ignore property-specific factors and produce inflated assessments. Errors commonly involve wrong comparables, incorrect square footage/class/land-use data, overvaluation, or unaccounted local market shifts. These can be challenged in an appeal.
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In 2025 our clients were 1.7 times as likely to win a reduction at the Assessor, and 1.3 times as likely at the Board of Review, as clients of attorneys with 100+ decided residential appeals (2.2 times at the Assessor in 2026 so far, as of October 29, 2026).
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Every level: Assessor → Board of Review → PTAB or Circuit Court
Source: Cook County Assessor and Board of Review public appeal records. Past results do not guarantee a similar outcome.
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