How do I appeal my Cook County property taxes?

If you believe your property in Cook County is overassessed, you have the right to file a property tax appeal. An appeal asks the county to review your property’s assessed value and determine whether it should be reduced.

Both homeowners and commercial property owners can file appeals during their township’s official filing window.

Step 1: Check If Your Township Appeal Window Is Open

Cook County property tax appeals must be filed during a limited filing period for your township.

Each township typically has a filing window of about 30 days, and deadlines are strict.

You can check current Cook County appeal deadlines here:
Cook County Property Tax Appeal Deadlines page..

If the window is closed, you may need to wait until the next appeal opportunity.

Step 2: Review Your Property Assessment

Before filing an appeal, review the details of your property assessment. Check for:

• Incorrect property size or features

• Errors in property records

• A value that appears higher than similar nearby properties

If your property seems overvalued, you may have grounds for an appeal.

Step 3: Gather Supporting Evidence

Strong evidence helps support your appeal.

Common types of evidence include:

• Comparable property sales

• Lower assessments for similar properties

• Property condition issues

• Appraisal reports

For commercial properties, additional evidence may include:

• Income and expense statements

• Vacancy rates

• Rental market data

Step 4: File the Appeal Online

Most Cook County property tax appeals are filed online through one of the following agencies:

Cook County Assessor’s Office

This is usually the first opportunity to appeal after reassessment notices are issued.

Cook County Board of Review

If you disagree with the Assessor’s decision, you can file another appeal.

You must file it with the Board of Review.

You can file only during the filing period.

Both agencies review the evidence and determine whether the assessed value should be adjusted.

Step 5: Wait for the Decision

After submitting your appeal, the agency will review your documentation.

Possible outcomes include:

• A reduction in your assessed value

• No change to your assessment

• A request for additional information in certain cases

If the appeal is successful, the reduced assessment may lower your property tax bill.

Key Takeaways

• Property tax appeals challenge an assessed value that may be too high.

• Appeals must be filed during your township’s official filing window.

• Evidence such as comparable properties or income data helps support your case.

• Appeals can be filed with the Assessor and later with the Board of Review.

• A successful appeal may lower your assessed value and potentially reduce your tax bill.

For Cook County homeowners and commercial property owners, filing a property tax appeal is an important step. It helps ensure your property is assessed fairly.