Illinois collar counties open property tax appeal windows

Property tax appeal windows are opening across Illinois’ collar counties, giving homeowners and businesses a short chance to challenge assessed values before local deadlines close. The timing matters as high taxes, rising values and pension costs continue to push property bills higher outside Chicago and Cook County.

Why it matters: - Property tax appeals can lower the equalized assessed value of homes and businesses, which can reduce tax bills. - The appeal window is short in the collar counties, so missing a township deadline can mean waiting until the next cycle. - Illinois homeowners and businesses are facing continued pressure from high property taxes, rising property values and long-term pension costs.

What happened: - Appeal windows are opening across Chicago’s collar counties as the 2026 filing season begins. - The collar counties are DuPage, Grundy, Kane, Kendall, Lake, McHenry and Will. - Most appeal deadlines in these counties fall between July and September. - Current Kane County deadlines include Blackberry on July 27, 2026; Geneva on August 17, 2026; and Big Rock on August 17, 2027. - Current Lake County deadlines include Benton on August 24, 2026, and Ela on August 24, 2026. - Current McHenry County deadlines include Richmond on August 6, 2026, and Chemung on August 13, 2026. - All Will County townships have a September 14, 2026 deadline.

The details: - Illinois property tax appeals outside Cook County are filed with the local Board of Review. - Property owners in the collar counties can contact their assessor and request a reduction, but they cannot make a formal appeal to the assessor. - Exemptions remain an important first step for many property owners. - The standard Illinois homestead exemption lowers a home’s equalized assessed value by $8,000. - Additional exemptions are available for veterans, seniors and people with disabilities. - Some specialty exemptions have income limits, while others do not. - Appeals can help properties with few exemptions, no exemptions or existing exemptions. - Appeals are especially useful for businesses, rental homes and second homes. - Many assessors in Illinois recommend annual appeals to maintain accountability and keep valuations aligned with market conditions.

Between the lines: - Illinois property taxes remain structurally high because pension costs continue to rise and are protected under the state constitution. - The release points to the “Edgar Ramp,” a decades-old pension funding policy, as a reason costs keep climbing through 2045. - Tax protections can be weakened by tools such as tax increment financing, which can shift costs and limit relief. - As local and federal funding tightens, property owners are being asked to absorb more of the bill.

What's next: - Property owners in the collar counties should check township-specific deadlines and file appeals before the window closes. - Homeowners and businesses seeking help can enroll in O’Connor’s Property Tax Protection Program™. - O’Connor says enrollment takes 2 to 3 minutes online and carries no upfront fee unless the company reduces property taxes.

The bottom line: - In Illinois’ collar counties, appeal season is a limited chance to challenge assessments and potentially lower property taxes before deadlines pass.