Cook County Property Tax Appeal Deadlines

If you own property in Cook County, knowing your property tax appeal deadlines by township is critical to protecting your bottom line.

Each year, the Cook County Assessor’s Office reassesses property values township by township as part of a triennial assessment cycle, in which one-third of all townships are reassessed every year over a three-year period. The filing deadlines vary depending on where your property is located. This Cook County property tax appeal deadlines page is your go-to resource for up-to-date filing deadlines with the Cook County Assessor, the Cook County Board of Review, and the Illinois Property Tax Appeal Board (PTAB).Whether your property is in Barrington, Berwyn, Bloom, Bremen, Calumet, Cicero, Elk Grove, Evanston, Hanover, Hyde Park, Jefferson, Lake, Lemont, Leyden, Lyons, Maine, New Trier, Niles, Norwood Park, North Chicago, Oak Park, Orland, Palatine, Proviso, Rich, River Forest, Rogers Park, Schaumburg, Stickney, South Chicago, Thornton, West Chicago, Worth, or Lake View, missing your appeal window can mean overpaying thousands of dollars in taxes.