If you miss a deadline, that level usually closes—no extensions. If you missed the Assessor's deadline, you may still file at the Board of Review if its window is open. If you missed the Board of Review, you generally can't go to PTAB (which requires a prior Board of Review filing) and must wait for the next cycle (properties are reassessed every three years).
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What happens if I missed my township's property tax appeal deadline?
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Most Cook County homeowners are over-assessed. Check your potential savings in under a minute.
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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 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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