Cook County Assessor / Illinois Department of Revenue
Seniors 65 and older with total household income under $75,000 (2025) can freeze their property's equalized assessed value at the base year level, preventing increases due to inflation. The income limit is set to increase to $79,000 by 2028. Must file annually.
Freezes EAV at base year; savings grow as property values rise
Deadline: File PTAX-340 annually; income limit $75,000 (2025), increasing to $79,000 by 2028
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