Oak Park property tax appeals: deadlines and a free assessment check
Is your Oak Park 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.
Oak Park Township All of Oak Park
The 2026 appeal windows for Oak Park have closed. You can still check the comps now and file next year.
- Cook County Assessor notices mailed May 6, 2026; appeals due June 18, 2026. File at the Assessor
- Board of Review opens August 3, 2026; closes September 1, 2026. File at the Board
Last year 1,468 Oak Park Township homeowners filed their own Board of Review appeal and 53% won a reduction.
What to do
- 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.
New to this? Read how to appeal, step by step.