Illinois Property Tax Assessment Reform Act and Logan Square Homeowner Bills

The Illinois General Assembly enacted the Property Tax Assessment Reform Act in June 2026, requiring county assessors to update residential valuations using data from the prior calendar year. Logan Square homeowners in ZIP codes 60647 and 60639 will see their properties reassessed under the new schedule that begins with notices mailed in September.

The change follows a 2025 Cook County review that identified outdated valuations across multiple Chicago neighborhoods. State budget documents project that the reform will shift roughly 180 million dollars in annual tax obligations among residential parcels in Cook County alone.

Local effects and comparisons

Under the legislation, Logan Square single-family homes valued near the neighborhood median of 485000 dollars receive an average assessment increase of 9 percent. This figure contrasts with the 14 percent average rise projected for properties in Evanston and the 4 percent rise expected in parts of the Austin neighborhood, according to the same county data set. Renters in multi-unit buildings on Milwaukee Avenue will encounter the new valuations indirectly through landlord filings that determine next-year lease amounts.

The act also directs assessors to apply a uniform appeal window of 30 days after notice receipt. Local advocates note that this timeline replaces the previous 45-day period used in Cook County and aligns it with procedures already in place in DuPage and Lake counties.

Implementation timeline

County offices will begin mailing revised bills in November 2026, with payments due in two installments starting March 2027. The legislation states that any revenue shortfall for local school districts must be offset through the existing state aid formula rather than new local levies. Residents can track individual parcel updates through the Cook County assessor’s online portal, which the bill requires to be updated weekly once notices are issued.