March 24, 2026
Most Cook County homeowners have no idea whether their property tax assessment is accurate. They get the bill, pay it, and move on. But a significant portion — especially in reassessment years — are paying more than they should.
Here's how to check in 60 seconds, for free.
Your property taxes are based on your assessed value, which the Cook County Assessor sets (typically at around 10% of your estimated market value). That assessed value is then multiplied by a state equalization factor and your local tax rate to produce your bill.
If the Assessor overestimates your property's value, your taxes go up — even if you haven't done anything to increase the value of your home.
The most reliable way to know if you're overpaid is to compare your assessed value to properties that have actually sold nearby. If similar homes sold for less than your assessment implies, you likely have grounds for an appeal.
This used to require hiring an attorney or spending hours in public records. Now it takes 60 seconds.
No account required. No credit card. Just your address.
If there's a significant gap between your assessed value and comparable properties, you're likely overpaying and have a strong case for appeal.
If your assessment is in line with comparable sales, you're probably paying what you should. No appeal needed.
If your township is in an active appeal window, we'll walk you through filing directly from the results page.
Cook County's South District townships — Bloom, Bremen, Calumet, Rich, Thornton, Worth — are all in the 2026 reassessment cycle. Reassessment years are the highest-impact years to appeal, because the Assessor is recalculating everything from scratch.
If you're in a South District township, run your free check now before the appeal window closes.