10 of 38 townships are accepting appeals today
Cook County Property Tax Appeal Deadlines by Township
Find Your Cook County Property Tax Appeal Deadline
Enter your property address or 14-digit PIN. We map it to the correct township and show your Cook County Assessor and Cook County Board of Review filing windows.
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Filing windows by township
Cook County Township Deadlines
Each row shows when notices were mailed and the key Assessor and Board of Review filing windows. Use the controls below to filter by status, search by township name, or switch between tax years.
Calumet Township
Assessor closes tomorrow
Assessor appeal window
OPENAug 20 – Oct 2, 2026
Board of Review appeal window
DATES NOT RELEASED
Notice mailed: Aug 20, 2026
Reassessed 2026 → next 2029
Hyde Park Township
Assessor closes in 7 days
Assessor appeal window
OPENAug 26 – Oct 8, 2026
Board of Review appeal window
DATES NOT RELEASED
Notice mailed: Aug 26, 2026
Reassessed 2026 → next 2029
Leyden Township
Assessor closes in 13 days
Assessor appeal window
OPENAug 31 – Oct 14, 2026
Board of Review appeal window
DATES NOT RELEASED
Notice mailed: Aug 31, 2026
Reassessed 2026 → next 2029
Worth Township
Assessor closes in 14 days
Assessor appeal window
OPENSep 1 – Oct 15, 2026
Board of Review appeal window
DATES NOT RELEASED
Notice mailed: Sep 01, 2026
Reassessed 2026 → next 2029
Wheeling Township
Assessor closes in 21 days
Assessor appeal window
OPENSep 9 – Oct 22, 2026
Board of Review appeal window
DATES NOT RELEASED
Notice mailed: Sep 09, 2026
Reassessed 2026 → next 2029
Proviso Township
Assessor closes in 26 days
Assessor appeal window
OPENSep 14 – Oct 27, 2026
Board of Review appeal window
DATES NOT RELEASED
Notice mailed: Sep 14, 2026
Reassessed 2026 → next 2029
Lake Township
Assessor closes in 28 days
Assessor appeal window
OPENSep 16 – Oct 29, 2026
Board of Review appeal window
DATES NOT RELEASED
Notice mailed: Sep 16, 2026
Reassessed 2026 → next 2029
Palatine Township
Assessor closes in 34 days
Assessor appeal window
OPENSep 22 – Nov 4, 2026
Board of Review appeal window
DATES NOT RELEASED
Notice mailed: Sep 22, 2026
Reassessed 2026 → next 2029
Orland Township
Assessor closes in 36 days
Assessor appeal window
OPENSep 24 – Nov 6, 2026
Board of Review appeal window
DATES NOT RELEASED
Notice mailed: Sep 24, 2026
Reassessed 2026 → next 2029
Jefferson Township
Assessor closes in 42 days
Assessor appeal window
OPENSep 29 – Nov 12, 2026
Board of Review appeal window
DATES NOT RELEASED
Notice mailed: Sep 29, 2026
Reassessed 2026 → next 2029
Barrington Township
No window open yet
Assessor appeal window
CLOSEDAug 11 – Sep 23, 2026
Board of Review appeal window
DATES NOT RELEASED
Notice mailed: Aug 11, 2026
Reassessed 2026 → next 2029
Berwyn Township
Both windows closed
Assessor appeal window
CLOSEDMay 20 – Jul 6, 2026
Board of Review appeal window
CLOSEDAug 31 – Sep 29, 2026
Notice mailed: May 20, 2026
Reassessed 2026 → next 2029
Bloom Township
No window open yet
Assessor appeal window
DATES NOT RELEASED
Board of Review appeal window
DATES NOT RELEASED
Notice mailed: Not yet mailed
Reassessed 2026 → next 2029
Bremen Township
No window open yet
Assessor appeal window
CLOSEDAug 12 – Sep 24, 2026
Board of Review appeal window
DATES NOT RELEASED
Notice mailed: Aug 12, 2026
Reassessed 2026 → next 2029
Cicero Township
Both windows closed
Assessor appeal window
CLOSEDJun 17 – Jul 31, 2026
Board of Review appeal window
CLOSEDAug 31 – Sep 29, 2026
Notice mailed: Jun 17, 2026
Reassessed 2026 → next 2029
Elk Grove Township
Both windows closed
Assessor appeal window
CLOSEDJun 22 – Aug 4, 2026
Board of Review appeal window
CLOSEDAug 31 – Sep 29, 2026
Notice mailed: Jun 22, 2026
Reassessed 2026 → next 2029
Evanston Township
Both windows closed
Assessor appeal window
CLOSEDApr 22 – Jun 4, 2026
Board of Review appeal window
CLOSEDAug 3 – Sep 1, 2026
Notice mailed: Apr 22, 2026
Reassessed 2026 → next 2029
Hanover Township
No window open yet
Assessor appeal window
DATES NOT RELEASED
Board of Review appeal window
DATES NOT RELEASED
Notice mailed: Not yet mailed
Reassessed 2026 → next 2029
Lake View Township
Both windows closed
Assessor appeal window
CLOSEDMay 28 – Jul 13, 2026
Board of Review appeal window
CLOSEDAug 31 – Sep 29, 2026
Notice mailed: May 28, 2026
Reassessed 2026 → next 2029
Lemont Township
No window open yet
Assessor appeal window
CLOSEDAug 17 – Sep 29, 2026
Board of Review appeal window
DATES NOT RELEASED
Notice mailed: Aug 17, 2026
Reassessed 2026 → next 2029
Lyons Township
No window open yet
Assessor appeal window
CLOSEDJul 23 – Sep 3, 2026
Board of Review appeal window
DATES NOT RELEASED
Notice mailed: Jul 23, 2026
Reassessed 2026 → next 2029
Maine Township
Both windows closed
Assessor appeal window
CLOSEDJun 5 – Jul 21, 2026
Board of Review appeal window
CLOSEDAug 31 – Sep 29, 2026
Notice mailed: Jun 05, 2026
Reassessed 2026 → next 2029
New Trier Township
Both windows closed
Assessor appeal window
CLOSEDMay 7 – Jun 22, 2026
Board of Review appeal window
CLOSEDAug 3 – Sep 1, 2026
Notice mailed: May 07, 2026
Reassessed 2026 → next 2029
Niles Township
No window open yet
Assessor appeal window
DATES NOT RELEASED
Board of Review appeal window
DATES NOT RELEASED
Notice mailed: Not yet mailed
Reassessed 2026 → next 2029
North Chicago Township
No window open yet
Assessor appeal window
DATES NOT RELEASED
Board of Review appeal window
DATES NOT RELEASED
Notice mailed: Not yet mailed
Reassessed 2026 → next 2029
Northfield Township
No window open yet
Assessor appeal window
CLOSEDJul 24 – Sep 4, 2026
Board of Review appeal window
DATES NOT RELEASED
Notice mailed: Jul 24, 2026
Reassessed 2026 → next 2029
Norwood Park Township
Both windows closed
Assessor appeal window
CLOSEDApr 13 – May 26, 2026
Board of Review appeal window
CLOSEDAug 3 – Sep 1, 2026
Notice mailed: Apr 13, 2026
Reassessed 2026 → next 2029
Oak Park Township
Both windows closed
Assessor appeal window
CLOSEDMay 6 – Jun 18, 2026
Board of Review appeal window
CLOSEDAug 3 – Sep 1, 2026
Notice mailed: May 06, 2026
Reassessed 2026 → next 2029
Palos Township
Both windows closed
Assessor appeal window
CLOSEDJun 3 – Jul 17, 2026
Board of Review appeal window
CLOSEDAug 31 – Sep 29, 2026
Notice mailed: Jun 03, 2026
Reassessed 2026 → next 2029
Rich Township
No window open yet
Assessor appeal window
DATES NOT RELEASED
Board of Review appeal window
DATES NOT RELEASED
Notice mailed: Not yet mailed
Reassessed 2026 → next 2029
River Forest Township
Both windows closed
Assessor appeal window
CLOSEDApr 20 – Jun 2, 2026
Board of Review appeal window
CLOSEDAug 3 – Sep 1, 2026
Notice mailed: Apr 20, 2026
Reassessed 2026 → next 2029
Riverside Township
Both windows closed
Assessor appeal window
CLOSEDApr 24 – Jun 8, 2026
Board of Review appeal window
CLOSEDAug 3 – Sep 1, 2026
Notice mailed: Apr 24, 2026
Reassessed 2026 → next 2029
Rogers Park Township
Both windows closed
Assessor appeal window
CLOSEDApr 17 – Jun 1, 2026
Board of Review appeal window
CLOSEDAug 3 – Sep 1, 2026
Notice mailed: Apr 17, 2026
Reassessed 2026 → next 2029
Schaumburg Township
No window open yet
Assessor appeal window
DATES NOT RELEASED
Board of Review appeal window
DATES NOT RELEASED
Notice mailed: Not yet mailed
Reassessed 2026 → next 2029
South Chicago Township
No window open yet
Assessor appeal window
DATES NOT RELEASED
Board of Review appeal window
DATES NOT RELEASED
Notice mailed: Not yet mailed
Reassessed 2026 → next 2029
Stickney Township
No window open yet
Assessor appeal window
CLOSEDJun 29 – Aug 12, 2026
Board of Review appeal window
DATES NOT RELEASED
Notice mailed: Jun 29, 2026
Reassessed 2026 → next 2029
Thornton Township
No window open yet
Assessor appeal window
DATES NOT RELEASED
Board of Review appeal window
DATES NOT RELEASED
Notice mailed: Not yet mailed
Reassessed 2026 → next 2029
West Township
No window open yet
Assessor appeal window
CLOSEDJul 10 – Aug 21, 2026
Board of Review appeal window
DATES NOT RELEASED
Notice mailed: Jul 10, 2026
Reassessed 2026 → next 2029
38 townships shown for 2026
10 accepting appeals now
HOW APPEALS WORK IN COOK COUNTY
Your Appeal Pathway, Step by Step
There are several ways to challenge a Cook County property tax assessment. The Assessor stage is optional. After a final Board of Review decision a taxpayer may proceed to the Property Tax Appeal Board (PTAB) or, in the alternative, file a tax objection complaint in the Circuit Court of Cook County. The two post-Board remedies are alternatives, not sequential.
OPTIONAL, STAGE 1
Cook County Assessor
File the initial appeal with the Cook County Assessor while your township's appeal window is open. The Assessor sets the closing date for each township; the window opens when reassessment notices are mailed.
WINDOWOPENS AT NOTICE MAILING; CLOSES ON THE TOWNSHIP'S LAST FILING DATE SET BY THE ASSESSOR.
Authority: Cook County Assessor's Office
STAGE 2
Cook County Board of Review
If the Assessor denies relief, or if the taxpayer prefers to skip the Assessor, file with the Board of Review during its session for that township. The Board is a quasi-judicial body that reviews the Assessor's valuation based on the evidence the taxpayer submits.
WINDOWOPENS WHEN THE BOARD'S SESSION FOR THE TOWNSHIP OPENS; CLOSES ON THE TOWNSHIP-SPECIFIC FINAL FILING DATE.
Authority: 35 ILCS 200/16-95 et seq.
STAGE 3, OPTION A
PTAB (Property Tax Appeal Board)
After a final Board of Review decision, the taxpayer may file a state-level appeal with PTAB. PTAB conducts a de novo review based on the evidence presented.
FILING WINDOW30 DAYS FROM THE LATER OF THE BOARD'S WRITTEN DECISION OR THE DATE IT SENDS ITS FINAL ACTION ON YOUR TOWNSHIP TO THE ASSESSOR. A MAILED PETITION IS FILED ON ITS POSTMARK DATE.
Authority: 35 ILCS 200/16-160; 86 Ill. Adm. Code 1910.30
STAGE 3, OPTION B
Circuit Court of Cook County (Tax Objection)
As an alternative to PTAB, the taxpayer may file a tax objection complaint in the Circuit Court of Cook County after the second installment of taxes is paid under protest. PTAB and the Circuit Court routes are alternative remedies; a taxpayer may not pursue both for the same year.
FILING WINDOWWITHIN THE TIME PERIOD SET BY STATUTE AFTER THE SECOND INSTALLMENT DUE DATE.
Authority: 35 ILCS 200/23-5 through 23-25
Quick rule of thumb: Stage 1 is optional. Stage 2 is the prerequisite for Stage 3. At Stage 3 the taxpayer chooses PTAB or the Circuit Court tax objection complaint, not both.
How the 2026 cycle works — which townships were reassessed, how the windows run, and what each level of appeal involves: read the full 2026 guide.
QUESTIONS & ANSWERS
Cook County Appeal Deadline FAQ
What is the easiest way to find my Cook County property tax appeal deadline?
Use the address and PIN lookup at the top of this page. Enter your property address or 14-digit PIN. The tool maps your property to the correct township and shows your current Assessor and Board of Review filing windows.
Can I search by address, or do I need my PIN?
Yes. The tool accepts a property address or a 14-digit PIN. After you select a property, the page displays the correct deadlines based on the township the property sits in.
Why do Cook County appeal deadlines change every year?
The Cook County Assessor and the Cook County Board of Review publish a fresh schedule each year, township by township. Reassessment cycles, hearing volume, and administrative scheduling all influence the dates.
How accurate is your deadline lookup?
The dataset behind this page is updated as the Assessor and the Board of Review publish their schedules. The firm verifies dates against the official publications.
Do I need to start at the Cook County Assessor before going to the Board of Review?
No. The Assessor stage is optional. A taxpayer may file directly with the Cook County Board of Review during its session for the relevant township.
Is PTAB my only remedy after the Board of Review?
No. After a final Board of Review decision, a taxpayer may proceed to PTAB or, in the alternative, file a tax objection complaint in the Circuit Court of Cook County under 35 ILCS 200/23-5 through 23-25. The two post-Board routes are alternative remedies; a taxpayer may not pursue both for the same year.
Do I need to know my township to use this tool?
No. Enter your address or PIN; the tool determines the township and shows the matching deadlines.
What happens after I find my deadline?
You can begin your file with the firm right away, or you can save the deadline and file later. Earlier engagement leaves more time to develop comparable sales evidence and other documentation.
RESOURCES
Everything You Need to File on Time
Triennial Cycle Calendar
See when each cook county township is reassessed in the rotating three-year cycle so you can plan years ahead. .
Documentation Checklist
The forms, comparable sales data, and supporting evidence commonly used at each appeal stage.
Fee & Cost Guide
Plain-English description of the firm’s contingency fee structure; subject to a written engagement agreement.
Deadline Alerts
Sign up for email or SMS reminders so you never miss your township's filing window.
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