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Cook County Sets Nov. 14 Mailing for Property Tax Bills, Dec. 15 Deadline

A long-delayed tech upgrade compressed the payment window for this cycle.

Overview

  • The cycle marks the first full run on the county’s new Tyler Technologies system after months of fixes to calculation errors.
  • The upgrade prompted repeated testing and recalculations to correct overbilling on some of the county’s roughly 1.8 million parcels.
  • Officials will begin clearing a backlog of certificates of error and refunds that were paused during the system remediation.
  • The county’s $300 million zero‑interest bridge‑loan program saw limited use, with 19 taxing bodies drawing $23.2 million to date.
  • A new state law pushes the 2025 first installment due date to April 1 at the earliest, and late payments on the current bill accrue a 0.75% monthly fee with online payment available.