This is one of the most reasonable homeowner questions in Illinois:
If there is a property tax cap, why does the bill keep going up?
The short answer is that the cap is real, but it is not absolute.
Quick Answer
The Property Tax Extension Limitation Law is meant to limit certain property tax increases, but Cook County Treasurer Maria Pappas's March 2026 report says local officials used PTELL loopholes and exceptions that allowed increases beyond what many taxpayers expect from the word "cap."
What PTELL Is Supposed To Do
PTELL is commonly described as limiting annual increases in certain property tax extensions to inflation or 5%, whichever is less.
That sounds simple. It is not.
The Pappas report says the law did not stop Cook County property taxes from rising far faster than inflation over 30 years.
Where The Exceptions Come In
The report points to several pressure points:
- Home rule municipalities are not bound by PTELL the same way.
- Voters can approve higher taxes by referendum.
- TIF district increases are not limited by PTELL.
- New funds can start outside normal limits.
- Some bond issues are exempt.
- Taxing bodies may recapture taxes refunded through appeals.
That is why "there is a cap" does not always mean "your bill cannot jump."
Why Homeowners Should Care
This changes how you diagnose the bill.
If the assessment is wrong, an appeal may help. If exemptions are missing, an exemption fix may help. If the increase came from levy decisions, referendums, TIFs, or taxing-body policy, the answer is not just an appeal.
FAQ
Does PTELL protect homeowners from all property tax increases?
No. It limits some increases, but there are exceptions and policy mechanics that can still push bills higher.
Can an appeal fix PTELL loopholes?
No. An appeal addresses assessment issues. PTELL is about how taxing bodies extend and collect taxes.
Next Step
Before deciding what to do, separate assessment problems from policy problems. Censum helps homeowners check whether the assessment side looks worth reviewing before they file, hire anyone, or give up a percentage of the result.