Mount Prospect property tax appeals: deadlines and a free assessment check

Is your Mount Prospect 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.

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

Elk Grove Township 51% of Mount Prospect's homes

The 2026 appeal windows for Elk Grove have closed. You can still check the comps now and file next year.

Cook County Assessor notices mailed June 22, 2026; appeals due August 4, 2026. File at the Assessor
Board of Review opens August 31, 2026; closes September 29, 2026. File at the Board

Last year 1,990 Elk Grove Township homeowners filed their own Board of Review appeal and 71% won a reduction.

The Assessor window has closed. The Board of Review opens this township later; check the Board's dates page or pre-register on its portal.

Cook County Assessor notices mailed September 9, 2026; appeals due October 22, 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 3,885 Wheeling Township homeowners filed their own Board of Review appeal and 70% 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.