Deadlines & how it works
What is a Cook County Reassessment Notice?
A Reassessment Notice is the letter the Cook County Assessor mails when it sets a new assessed value for your property — normally once every three years, in your township’s reassessment year. It states your new assessed value and the hard deadline to appeal it. It is not a bill.
The notice is your cue to check whether the new value is too high before it locks in for the next three years. Its appeal deadline is the binding one for the Assessor stage — confirm it against your township’s window.
Check your address — freeSee your own assessment math before you file. You keep 100%.