2026 township filing windows

Cook County property tax appeal deadlines by township

Cook County appeals move township by township. These pages focus on filing windows that are currently published and actionable, with the Assessor first and the Board of Review as the second independent opportunity.

Check your property

Not sure which township applies? Start with your property.

Enter a Cook County address or property PIN.

Free to check first. No credit card required.

Assessor windows currently published as open

The Assessor is the first review opportunity. If this stage is open, preserve it before relying on a later Board filing.

Barrington Township Assessor through Sep 23Bremen Township Assessor through Sep 24Lemont Township Assessor through Sep 29Calumet Township Assessor through Oct 2Hyde Park Township Assessor through Oct 8Leyden Township Assessor through Oct 14Worth Township Assessor through Oct 15Wheeling Township Assessor through Oct 22Proviso Township Assessor through Oct 27

Board of Review windows currently published as open

These townships are in the Board's published 2026 Group 2 filing period. Their Assessor windows have already closed.

Berwyn Township Board through Sep 29Cicero Township Board through Sep 29Elk Grove Township Board through Sep 29Lake View Township Board through Sep 29Maine Township Board through Sep 29Palos Township Board through Sep 29

Why township timing matters

The Assessor says Cook County does not use a single countywide residential appeal deadline. Filing windows are township-specific. The Board likewise publishes separate township filing periods, and the two stages are independent.

Understand the Assessor → Board deadline sequence →

Check your property

Check the property, then preserve the right filing opportunity.

Start a property search

Current pages reflect official dates verified September 16, 2026. Official Cook County calendars control.