When can I appeal to the Cook County Assessor, and how do township appeal windows work?
When can I appeal to the Cook County Assessor, and how do township appeal windows work?
Cook County opens Assessor appeal windows one township at a time, not on a single county-wide date — once your township opens you have roughly 30 days to file, and the exact close date is printed on your reassessment notice and on the Assessor's appeals calendar.
Unlike most jurisdictions that use one annual deadline, Cook County runs assessment appeals on a rolling township schedule. The county is divided into 38 townships, and the Cook County Assessor opens each township's appeal window separately over the course of the year. You cannot file until your township is officially open, and you must file before it closes.
How long the window stays open. The Assessor's office advises that taxpayers "typically have 30 days to file an appeal after receiving your reassessment notice. The last date to file an appeal for that year is printed on your notice." Confirm both the open and close dates on the Assessment & Appeal Calendar, which lists every township's status. See the Assessor's Appeals overview for the full process.
Filing is free and online. The Assessor states that "filing an appeal is free and can be done online in as little as 20 minutes" through the online appeals system; paper appeals are available for owners without online access. All appeals must follow the Official Appeal Rules of the Cook County Assessor.
You may not need to file every year. Because Cook County reassesses on a triennial cycle, the Assessor notes you generally file in a reassessment year and "do not need to do it each year, unless the characteristics of your property have changed significantly due to new construction, demolition, vacancy, or other issues." That said, you may file annually if you believe the value is too high.
The Assessor is only the first stop. If the Assessor denies or partially grants your appeal, you can separately appeal to the Cook County Board of Review, which runs its own township windows. Watch your township's status closely — once a window closes, you lose that stage for the year.