Leyden Township property tax appeal: 2026 deadline and filing stage

Leyden Township 2026 appeal status

Leyden is not in the scheduled 2026 south/west suburban reassessment group, but its annual Assessor appeal window is open.

The Cook County Assessor calendar lists Leyden as open from Aug 31, 2026 through Oct 14, 2026. If you want to preserve both Cook County review opportunities, the Assessor is the first filing stage. A later Board of Review filing does not restore a missed Assessor deadline.

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 Leyden appeal

The Board of Review recommends using similar properties with lower assessments for lack-of-uniformity cases and generally suggests several similar properties. Simple Tax Appeal evaluates Cook County parcel and assessment data to help homeowners narrow the evidence instead of treating every nearby property as a useful comp.