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Cook County to Mail Delayed Property Tax Bills Nov. 14, Payment Due Dec. 15

The timeline reset follows months of calculation problems tied to the county’s migration to a Tyler Technologies platform.

Overview

  • Bills cover about 1.8 million properties across Cook County.
  • This marks the first full property-tax billing cycle completed on the new system after errors emerged during testing and recalculation.
  • A $300 million zero-interest bridge-loan program was created for local governments, with records showing 19 taxing bodies received $23.2 million so far.
  • Officials say they have begun clearing a backlog of certificates of error and other refunds that were paused during the transition.
  • A state law passed last month shifts the 2025 first installment due date to April 1 at the earliest to provide more breathing room.