How to File Your Cook County Property Tax Appeal Online in 10 Minutes
Filing a residential property tax appeal online with the Cook County Assessor or Cook County Board of Review is 100% free for homeowners and multi-unit building owners. Once you have your comparable PINs and uniformity evidence packet, the entire online submission takes less than 10 minutes.
Open Your Township's Active County Appeal Portal
Depending on which agency is currently open for your township, open the official county portal:
- Cook County Assessor Online Appeals:
cookcountyassessoril.gov/online-appeals(currently open for Jefferson, Proviso, Lake, Palatine, Orland, Wheeling, and North Chicago Townships). - Cook County Board of Review Online Appeals:
appeals.cookcountyboardofreview.com(currently open for West Chicago, Northfield, and Lyons Townships).
Select "Homeowner / Self-Represented (Pro Se)" & Enter Your 14-Digit PIN
Create or sign in to your free county portal account, enter your property's 14-digit Permanent Index Number (PIN), and select Lack of Uniformity (and Overvaluation if recent comparable sales are included) as the reason for your appeal.
Paste Your 5–6 Same-Neighborhood Comparable PINs
In the Comparable Properties section of the online form, copy and paste the 5–6 lower-assessed 14-digit PINs from Section 2 of your Cook County Tax Appeals Evidence Packet. Every comparable is matched to your exact Assessor Neighborhood Code and Property Class.
Attach Your PDF Evidence Packet & Paste the Written Brief
Upload your 2-page PDF Comparable Uniformity & Sales Evidence Packet under Supporting Documentation, paste the Section 3 Written Appeal Brief into the narrative/comments field, and click Submit. Save your confirmation receipt number for your records.