No. Although the Assessor uses a three-year cycle, you can usually appeal every year—once with the Assessor and once with the Board of Review. The Assessor's window runs several weeks (42 to 47 days in 2026); the Board of Review's about 30 days. Filing in an off-year can lock in a lower value for the rest of the cycle.
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Do I have to wait for my scheduled reassessment year to file a property tax appeal?
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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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