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Illinois Property Tax Updates

Updated june 2025

Illinois Q2 Update

The northern suburbs of Cook County, Illinois, are currently being reassessed for 2025. All appeal deadlines are currently still open for all properties in Illinois.

Additionally, due to ongoing technical issues within the Cook County Assessor’s Office, second installment property tax bills will be delayed by at least one month beyond the statutory August due date, consistent with delays in the previous two years. The postponement of the expected August 1, 2025 due date may push billing into the peak consumer season. This is the 3rd time tax bills have been late under Fritz Kaegi tenure.

The Assessor’s Office attributes the delay to Tyler Technologies, its contracted vendor for modernizing assessment data systems. However, other tax officials allege administrative mismanagement, citing the Assessor’s failure to timely transmit initial assessment data to the Illinois Department of Revenue (IDOR). Although assessment work concluded in December 2024, data was not submitted to IDOR until April 30, 2025—three months later than the prior year.

Tyler Technologies reportedly failed to meet key deadlines in November 2024 and January 2025. The project was elevated to “High” priority on January 30, 2025, prompting weekly coordination meetings. Despite this, early versions of required IDOR reports remained defective, requiring manual reconstruction and significant workarounds. The final report was not transmitted until May 12, 2025.

This report is essential for IDOR’s issuance of the tentative and final Cook County Equalization Factors, which underpin second installment tax computations. Unlike in 2024, when both were issued by May 20, IDOR confirmed it cannot expedite both factors concurrently. Notably, this marks the first year the report was generated using the Assessor’s newly implemented “state-of-the-art” system rather than the legacy mainframe.

Finally, the Cook County Equalization Rate for 2024 has been published: 3.0355


“Molly” Mary A. Phelan
Siegel Jennings
American Property Tax Counsel (APTC)

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