Blog · Exemptions · 2026-08-02 · 2 min read

The senior assessment freeze: what it does and does not freeze

It freezes the assessed value, not the tax bill. People are surprised by that every year.

The senior citizens assessment freeze, under 35 ILCS 200/15-172, is the most valuable and most misunderstood benefit in the Illinois system. The name is the problem.

What it actually freezes

It freezes your equalised assessed value at the level of the year you first qualify.

It does not freeze your tax bill.

Your bill can still rise with the freeze in place. The freeze holds the assessed value steady. Tax rates are set separately, by each district's levy divided by the district's total value. If rates rise, your bill rises — you simply are not also absorbing an increase in your assessment.

Every year, someone who believed their taxes were frozen opens a higher bill and concludes the county has made a mistake. It has not. The freeze did what it says.

What it is worth

Nothing in year one, and a great deal after a decade in a rising market. That is the opposite shape to most exemptions, and it is why people undervalue it when deciding whether the form is worth completing.

If values in your area rise 5% a year and you hold the freeze for ten years, you are being assessed on a value roughly 40% below your neighbours' — permanently, for as long as you qualify.

Who qualifies

65 or over during the tax year.
You own and occupy the property as your principal residence.
Total household income below the statutory ceiling. This is the part that disqualifies people and the part that changes — the ceiling is revised periodically, so check the current figure rather than relying on a number you heard.

"Total household income" means everyone in the household, and it includes sources that are not taxable income — social security, pensions, and more. Read the definition on the form rather than assuming.

It must be renewed

This is where the freeze is most often lost. It is income tested, so it requires an annual application. Miss the year and the freeze resets to the current assessed value — you do not get the old base back.

That reset is permanent and it is expensive. If you hold this exemption, diary the renewal.

When it ends

Income rises above the ceiling — you can requalify later, but at the new value.
The property is sold or is no longer your principal residence.
The renewal is missed.

What to do

Confirm the general homestead exemption is applied.
Apply for the senior homestead exemption — no income test.
Apply separately for the freeze if income qualifies. It is a different form.
Diary the annual renewal, every year, without exception.

The three are cumulative. Claiming one and assuming it covers the others is the most common way Illinois seniors leave money on the table.

This is general information about how Illinois assessments and appeals work. It is not legal advice, not an appraisal, and not a prediction about your case. Deadlines and rules differ by county — check yours with your Board of Review.