File online during your township's official window at one of two levels: the Assessor's Office (first level) or the Board of Review (independent second level). Each has its own strictly enforced period, several weeks at the Assessor (42 to 47 days in 2026) and about 30 days at the Board—no single countywide deadline and no extensions. The three-year reassessment cycle covers Chicago, North suburbs, and South/West suburbs in separate years.
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Where and when can I file an appeal?
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Most Cook County homeowners are over-assessed. Check your potential savings in under a minute.
WHY CHOOSE US?
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 who filed 100+ residential appeals (2.2 times at the Assessor in 2026 so far).
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3-tier escalation: Assessor → BOR → PTAB
Source: Cook County Assessor and Board of Review public appeal records. Past results do not guarantee a similar outcome.
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