Tax caps (PTELL): what they limit, and what they do not
PTELL limits how fast a taxing body's total levy can grow. It does not cap your individual bill.
The Property Tax Extension Limitation Law is commonly called "tax caps", and the name causes more confusion than any other term in Illinois property tax. It does not cap your tax bill.
What it actually limits
PTELL limits how much a taxing district can increase its total levy year on year — the aggregate dollars it collects, not any individual bill.
The limit is broadly the lesser of 5% or the increase in the Consumer Price Index, plus an allowance for new construction and any voter-approved increases.
Why your bill can still rise more than that
If your assessment rises faster than the average in your district, your share of a capped levy grows. The district collected only 3% more; you paid 12% more, because you now represent a larger slice of the base.
This is precisely the situation a uniformity appeal addresses. If your assessment rose faster than comparable properties, you are carrying more of a fixed total than you should be — and that disparity, not the levy, is the thing you can actually contest.
The other reasons a capped bill rises
- New construction in the district is excluded from the cap.
- Voter-approved referenda are outside it.
- Debt service on bonds is generally excluded.
- Special service areas are separate levies and not covered.
- Home rule municipalities are not subject to PTELL at all.
Where it applies
PTELL applies in the collar counties and in counties that adopted it by referendum. It does not apply everywhere in Illinois, and it does not apply to home rule units. Whether your district is subject to it is a question for the county clerk.
What this means practically
PTELL is a constraint on government growth, and it works reasonably well at that. It is not consumer protection for an individual bill, and treating it as one leads to the common complaint that "we have tax caps and my bill went up 12%" — which is entirely possible and entirely consistent with the law.
The lever available to you is your own assessment: whether it is correct, and whether it is even-handed against comparable properties. That determines your share. PTELL determines the size of the pot, and there is nothing about your individual property that bears on it.
A worked example of the share problem
A school district levies $10 million. Its total taxable value is $500 million, so the rate is 2%. Your house is assessed at $100,000 and you pay $2,000.
The next year the district raises its levy by the CPI increase of 3%, to $10.3 million — fully compliant with PTELL. Meanwhile a reassessment raises values across the district by 5% on average, to $525 million, so the rate falls to about 1.96%.
If your assessment also rose 5%, to $105,000, you pay $2,060 — a 3% increase, matching the levy. The system worked as intended.
But if your assessment rose 15% while the district averaged 5%, you are at $115,000 and pay about $2,257 — an increase of nearly 13% in a year the district was capped at 3%. Nothing was breached. Your share simply grew.
Which is why the assessment is the lever
In that second case the question worth asking is not why the cap failed, because it did not. It is why your assessment rose three times faster than comparable properties — and that is exactly what a uniformity appeal is for.