Lyons Township property tax appeal deadline: 2026

Lyons Township 2026 appeal status

Lyons is part of Cook County's scheduled 2026 south/west suburban reassessment cycle.

The Cook County Assessor calendar lists Lyons from Jul 23, 2026 through Sep 3, 2026.

The Assessor window has closed. The Board of Review is a separate appeal stage, so check the Board status below rather than assuming the appeal opportunity is over.

The published Board of Review filing window shown for Lyons is Oct 8, 2026 through Nov 6, 2026.

The Board formal filing window is open now.

What homeowners should check before filing

1. Verify the property record. Building size, class, age, and other characteristics affect whether another property is a defensible comparison.
2. Compare assessments, not just sale prices. A uniformity appeal asks whether similar homes are assessed consistently.
3. Favor physically similar evidence. Nearby properties matter, but similarity in class, size, age, construction, and condition matters too.
4. Preserve the filing deadline. Official Cook County dates control, even if you are still improving the supporting evidence.

How comparable properties support a Lyons appeal

Cook County's current rules emphasize comparable properties that are similar in characteristics and location. Simple Tax Appeal screens Cook County parcel and assessment data to help identify defensible lower-assessed matches instead of treating every nearby property as a useful comp.

Lyons is in the 2026 reassessment area

Cook County's 2026 calendar identifies the south and west suburbs as the scheduled reassessment area. A reassessment notice is the trigger to verify the new value, property characteristics, and filing deadline.