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Parcelby Lattice

Appeal deadlines

Each county opens appeals on its own calendar, and Cook County goes township by township. Dates here come from the counties' published schedules. Check the county site before you file.

Aerial photograph of a residential neighbourhood in Springfield, Illinois
Springfield, Sangamon County. Aerial: USDA NAIP.

  • Champaign County

    Closed

    Closes Sep 30, 2026 (2026 tax year)

    30 days from assessment publication. Typically September.

  • Cook County

    Not yet published

    — (2026 tax year)

    Cook County has a rolling deadline by township. Check the Board of Review website for your township's specific filing period.

    County board of review site

  • DuPage County

    Closed

    Aug 15, 2026 to Sep 30, 2026 (2026 tax year)

    30 days from publication of assessment. Typically September-October.

    County board of review site

  • Kane County

    Closed

    Aug 15, 2026 to Sep 30, 2026 (2026 tax year)

    30 days from assessment publication. Typically August-September.

    County board of review site

  • Lake County

    Closed

    Aug 1, 2026 to Sep 15, 2026 (2026 tax year)

    30 days after assessment notices are mailed. Typically August-September.

    County board of review site

  • Madison County

    Closed

    Closes Oct 15, 2026 (2026 tax year)

    30 days from assessment publication. Typically September-October.

  • McHenry County

    Closed

    Closes Sep 30, 2026 (2026 tax year)

    30 days from assessment publication. Check county website for specific dates.

    County board of review site

  • Peoria County

    Closed

    Closes Sep 30, 2026 (2026 tax year)

    30 days from assessment publication. Typically September.

  • Sangamon County

    Closed

    Closes Sep 30, 2026 (2026 tax year)

    30 days from assessment publication. Check county website for specific dates.

  • St. Clair County

    Closed

    Closes Sep 30, 2026 (2026 tax year)

    30 days from assessment publication. Check county website for specific dates.

  • Will County

    Open now

    Oct 1, 2026 to Nov 15, 2026 (2026 tax year)

    30 days from publication of equalized assessed value. Typically October-November.

    County board of review site

  • Winnebago County

    Closed

    Closes Sep 30, 2026 (2026 tax year)

    30 days from assessment publication. Typically September.

    County board of review site

Not sure your assessment is worth appealing? Check your property first.