Flossmoor property tax appeals: deadlines and a free assessment check

Is your Flossmoor home assessed higher than similar homes nearby? Check in a minute, then file yourself for free.

Free. No sign-up. Compares your home with the 5 to 10 most similar homes nearby, from the Assessor's own data.

Flossmoor spans 2 townships. Your result page shows which one your home is in, and its exact deadline.

Rich Township 74% of Flossmoor's homes

Assessor appeals are open until December 4, 2026. 28 days left

Cook County Assessor notices mailed October 21, 2026; appeals due December 4, 2026. File at the Assessor
Board of Review dates not announced yet. Leave your email on your result page and we'll tell you when they are. File at the Board

Last year 2,344 Rich Township homeowners filed their own Board of Review appeal and 42% won a reduction.

Dates for this township weren't published when our calendar was last updated.

Cook County Assessor notices mailed not announced yet; appeals due December 17, 2026. File at the Assessor
Board of Review dates not announced yet. Leave your email on your result page and we'll tell you when they are. File at the Board

Last year 1,537 Bloom Township homeowners filed their own Board of Review appeal and 49% won a reduction.

Run the free check above. It compares your assessed value per square foot with similar homes in your assessment neighborhood.
If yours looks high, get the evidence kit from the result page: the comps in the Board's format, recent sales, and a statement to paste into the form.
File online at the office whose window is open. Filing is free at both. You type the complaint yourself; only you or an Illinois attorney can file for your home.
Leave an email on the result page and we'll remind you a week and three days before the deadline.