How to Contest Your Property Taxes in DuPage and Cook County, Illinois (And Why You Should!)
If you own a home or commercial property in DuPage or Cook County, chances are you've opened a property tax bill and thought, "This can't be right." You're not alone. Illinois consistently ranks among the states with the highest property taxes—and unfortunately, many of those bills are based on inaccurate or outdated assessments.
The good news? You can contest your property tax assessment, and you might be surprised by how often appeals result in savings.
Why You Should Consider Appealing
Your property taxes are based on your property's assessed value—but assessments are far from perfect. They might be based on outdated data, incorrect square footage, or flawed comparable sales. If your home is over-assessed, you could be paying far more than your fair share.
Common signs your property may be over-assessed:
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Your home is assessed at a higher value than similar homes nearby.
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The condition of your home (e.g., needed repairs, unfinished areas) wasn't considered.
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Property values in your neighborhood have declined.
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You’ve received a significantly higher assessment without making any major improvements.
How to Contest Property Taxes in DuPage and Cook County
1. Review Your Assessment Notice
Each county sends out assessment notices by mail. These include your current assessed value and appeal instructions.
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DuPage County: https://www.dupagecounty.gov/AssessmentAppeals/
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Cook County: https://www.cookcountyassessor.com/appeals
2. Research Comparable Properties
Find homes similar to yours that recently sold in your area. Look for comparable square footage, age, condition, and lot size—and ideally, lower assessments.
3. File Your Appeal
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Cook County: You can appeal online with the Assessor’s Office or the Board of Review.
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DuPage County: Appeals are filed with the County Board of Review using a form and supporting documentation.Important: Deadlines vary by township, so don’t wait too long.
4. Attend a Hearing (If Needed)
Some appeals require a short hearing—especially if you submit detailed evidence or hire a professional.
Need Help? I’ll Walk You Through It—Free of Charge
I know this process can feel a bit intimidating, but I’m happy to help—at no cost. If you want a second set of eyes on your assessment or need help finding comparable properties, just reach out.
Rather have a pro handle everything? I can refer you to experienced property tax appeal services in DuPage and Cook County who will handle the entire process—many work on contingency, so they only charge if they save you money.
Bonus Benefit: Lower Property Taxes Can Help You Sell Your Home Faster
If you're thinking about selling your home in the near future, here's another reason to appeal your taxes: Lower property taxes make your home more attractive to buyers. High taxes can be a deal-breaker, even for an otherwise perfect property. A successful appeal not only saves you money now—it could also help your home sell faster and at a better price down the road.
Bottom Line: Don’t assume your property tax bill is accurate. Contesting your assessment could save you hundreds or even thousands of dollars a year—and make your home easier to sell when the time comes. I’m here to help with the process or connect you with a trusted tax appeal expert.
Reach out today for a free review or referral! 773-425-6265
