Why did my property tax bill increase so much?

A large increase in your Cook County property tax bill can happen for several reasons. Property taxes are based on your assessed property value and local tax rates. Changes in either one can change how much you owe.

Understanding why your property taxes increased can help you see if they are accurate. You may also want to file a property tax appeal.

Common Reasons Property Tax Bills Increase

1. Your Property’s Assessed Value Increased

Your property tax bill is partly based on your property’s assessed value determined by the Cook County Assessor.

If the Assessor believes your property is worth more due to rising market values or a reassessment, the assessed value may increase. A higher assessment can lead to a higher tax bill.

2. Reassessment in Your Township

Cook County follows a three-year reassessment cycle that updates property values across the county.

When your township is reassessed, the Assessor reviews property values and may adjust them based on recent market conditions. During these reassessment years, many property owners see noticeable changes in their assessments.

3. Local Tax Rates Increased

Your property tax bill also depends on the tax rates set by local taxing districts, such as:

• School districts

• Municipal governments

• Park districts

• Libraries and other local services

If these districts raise their budgets, the tax rate may rise. This can raise your property tax bill, even if your assessed value stays the same.

4. Property Improvements or Renovations

If you improve your property, the Assessor may increase its assessed value.
For example, you might add more space.
Or you might renovate part of the building.

Examples include:

• Home additions

• Major remodeling projects

• New construction

• Improvements to commercial buildings

These changes can increase the property’s estimated market value.

5. Changes in Exemptions

Certain exemptions can reduce the taxable value of residential properties. If you previously qualified for an exemption but no longer do, your tax bill may increase.

Common examples include:

• Homeowner exemptions

• Senior exemptions

• Other eligibility-based exemptions

What You Can Do If the Increase Seems Incorrect

If your tax bill increased significantly and you believe the assessment is too high, you may have the option to file a Cook County property tax appeal.

An appeal allows you to present evidence showing that the property may be overassessed.

Appeals must be filed during your township’s official filing window. You can check current deadlines here:

Cook County Property Tax Appeal Deadlines page..

Key Takeaways

• Property tax bills can increase due to higher assessed values or higher tax rates.

• Township reassessments often lead to noticeable changes in assessments.

• Property improvements or loss of exemptions can increase taxes.

• Local taxing districts also influence tax rates.

• Property owners can file an appeal if they believe their property is overassessed.

Understanding why property taxes increased can help Cook County homeowners and business owners decide if the assessment is accurate.
It can also help them decide if an appeal is appropriate.