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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