Deadlines & how it works
When is the deadline to appeal my Cook County property taxes?
There is no single county-wide deadline — it depends on your township. The Cook County Assessor opens each of the 38 townships for roughly six weeks on a rolling schedule through the year, and the deadline is a hard date printed on your Reassessment Notice. 6 townships are open right now.
Find your township’s exact window on the deadlines-by-township table. If the Assessor’s window has already closed, you get a second chance: the Board of Review opens the same township later, with its own separate deadline.
Check your address — freeSee your own assessment math before you file. You keep 100%.