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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.

WINDOW: OPENS 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.

WINDOW: OPENS 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 WINDOW: 30 DAYS FROM THE POSTMARK OF THE BOARD'S FINAL DECISION.

Authority: 35 ILCS 200/16-160

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 WINDOW: WITHIN 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.

QUESTIONS & ANSWERS

Cook County Appeal Deadline FAQ

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.
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.
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.
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.
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.
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.
No. Enter your address or PIN; the tool determines the township and shows the matching deadlines.
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.

Time-sensitive

Don't Let Your Deadline Pass

Missing your appeal window can mean overpaying property taxes for years.
The firm's team will evaluate your property and recommend a strategy.

17

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