America's Property Tax Advisor

POER's Chicago office represents clients' properties in the State of Illinois.


This information is deemed to be a reliable calendar of specific property tax event dates that are updated quarterly and throughout the year as changes are known. However, it is not guaranteed and some dates and/or jurisdictions are not listed.


For POER's local office contact information for this state, visit our locations page.

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Assessment Ratio: 33.3% — Except Cook County (Chicago)
10% — Apartments - Cook County
25% — Industrial - Cook County
25% — Commercial - Cook County

Fiscal Tax Year:

01/01 - 12/31

Valuation Authority:

Township or County

Collection Authority: County
Level One Appeal Name: County Board of Review
(for properties outside Cook County)
Cook County Assessor
(for properties within Cook County)
Consultant Certification/Licensing:

Not Required

Real Estate Taxable? Yes

RE Rendition Required:


Non-Disclosure State?


Personal Property Taxable? No
PP Rendition Required: No
Inventory Taxable? No


Assessment Date: Jan 1  
Appeal Deadline:

Jun - Dec

30 days after notices are published

  Feb - Dec Cook County - First level of appeal to Cook County Assessor's office.
Approximately 30 days as published by AO after notices are issued. Publication and appeal dates by Township are posted on the Cook County Assessor's website.
  Aug - Feb Cook County - Second level of appeal to Cook County Board of Review (BOR)
Tax Bills Issued: Varies  
Tax Bills Due: Jun & Sep Two installments but due dates may vary by county
  Mar 1 Cook County - 1st half installment, estimated at 55% of prior year tax bill with taxes paid in arrears.

Aug 1

Cook County - 2nd half installment - TARGETED but may be delayed - due 30 days after being issued. Reconciled installment using the BOR certified AV, actual local tax rate, and final state equalization factor, less the estimated 1st installment with taxes paid in arrears


Assessment Date: Exempt
Tax Bills Due: Exempt