DuPage County Property Tax Appeal Deadlines & Due Dates for 2021

DuPage County Property Tax Appeal Deadlines for 2018Below is a listing of 2021 deadlines for appealing your DuPage County property taxes with the Supervisor of Assessments.

  • Dates in green have been announced (the window to appeal is now open)
  • Dates in red have passed (the window to appeal has closed)
  • Dates in gray are estimated based on previous years

The earliest you can submit a property tax appeal is the date listed as “Open for Filing” and no property tax appeal will be accepted after the “Closed for Filing” deadline. Click here if you don’t know which DuPage County township you live in.

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DuPage County Township
DuPage County Assessor Open for Filing (Notice Date)
DuPage County Board of Review Closed for Filing (Final Complaint Filing)
Addison
October 
November 
Bloomingdale
July 23
August 23 
Downers Grove
September 01 
October 04
Lisle
August 
September 
Milton
July 
August 
Naperville
June 
July 
Wayne
October 
November 
Winfield
October 
November 
York
August 
September 

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2020 DuPage County Property Tax Appeal Deadlines & Due Dates

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