Des Plaines property tax appeals: deadlines and a free assessment check

Is your Des Plaines 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.

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

Maine Township 80% of Des Plaines's homes

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

Cook County Assessor notices mailed June 5, 2026; appeals due July 21, 2026. File at the Assessor
Board of Review opens August 31, 2026; closes September 29, 2026. File at the Board

Last year 3,138 Maine Township homeowners filed their own Board of Review appeal and 68% won a reduction.

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.

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.