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What happens if I missed my township's property tax appeal deadline?
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 cannot go to PTAB for that year, because PTAB needs a Board of Review decision. You can appeal every year, not only in your reassessment year. If you missed both windows this year, a Certificate of Error can still correct a factual error or a missing exemption, and every township's windows open again next year.
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ATTORNEYS & CPAs, EVERY VENUE
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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$0 Upfront cost — no fee unless your assessment is reducedOur fee is 25% of first-year savings, only if your assessment is reduced.
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