Illinois collar counties open property tax appeal windows

Appeal season is opening across Illinois collar counties around Chicago, giving homeowners and businesses a limited chance to challenge property valuations before local deadlines. The timing matters because property taxes remain the nation’s highest in Illinois, and successful appeals can help reduce the bill or lock in a lower assessed value.

Why it matters: - Illinois property owners face the nation’s highest property taxes, and collar county residents outside Cook County are now entering a short window to challenge assessments. - Appeals can lower the equalized assessed value of a home or business and reduce future tax exposure, especially as property values and tax burdens keep rising. - For owners with exemptions, an appeal can add another layer of savings before taxes are calculated.

What happened: - Appeal windows are opening across the Chicago-area collar counties as local townships begin or prepare for their Board of Review filing periods. - The collar counties are DuPage, Grundy, Kane, Kendall, Lake, McHenry and Will. - Most collar county appeal deadlines fall between July and September. - O'Connor outlined the filing windows and urged taxpayers to act when their township opens.

The details: - Illinois homestead exemptions reduce a home’s equalized assessed value by $8,000. - Additional exemptions may be available for veterans, seniors and people with disabilities. - Some specialty exemptions have income limits, while others do not. - Property tax appeals challenge the assessor’s valuation directly, which serves as the basis for property taxes. - Appeals can matter even when the savings are small because they establish a more defensible value for future years. - Businesses, rental homes and second homes can use appeals even when they qualify for few or no exemptions. - Many assessors recommend annual appeals to improve accountability and keep valuations in check. - Appeals require evidence and valid grounds to succeed.

Between the lines: - Illinois’ pension costs continue to pressure local budgets, and the state’s long-running pension ramp is still pushing costs higher through 2045. - Tax caps can be weakened by mechanisms such as tax incremental financing districts. - As more residents move for affordability or schools, demand in the collar counties can push up values and taxes there too. - This is not just a Chicago or Cook County issue; suburban communities are absorbing part of the same fiscal strain.

What's next: - Kane County deadlines currently include Blackberry on July 27, 2026; Geneva on August 17, 2026; and Big Rock on August 17, 2027. - Lake County deadlines currently include Benton and Ela, both on August 24, 2026. - McHenry County deadlines currently include Richmond on August 6, 2026, and Chemung on August 13, 2026. - All Will County townships have a September 14, 2026 deadline. - Property owners who want help can enroll in O'Connor’s Property Tax Protection Program, which has no upfront fee and charges only if taxes are reduced.

The bottom line: - Collar county property owners have a narrow chance to fight assessments now, and missing the window can mean waiting another year to challenge a tax bill that may already be too high.