Cook County, Illinois
Leyden Township Property Tax Appeal Deadline
When the Leyden Township appeal window is open, you can file an appeal of your Cook County property assessment for free. Below is the current filing status from the Cook County Assessor calendar.
Current filing status
Assessor appeal window
Not currently open. Confirm the next window on the Cook County Assessor calendar.
Board of Review appeal window
Opens after the Assessor window closes. Confirm dates on the Board of Review calendar.
Assessment data as of October 1, 2025.
How Leyden homes compare
Of 23,136 homes analyzed in Leyden Township, 3,648 look over-assessed compared with the median for similar nearby properties. Among those homes, the average gap above the median is about $8,174 in assessed value.
Whether your own home is over-assessed depends on your specific property. Run the free check to see where yours stands.
Check your Leyden property first
Before you file, see whether your home is assessed above the median for comparable properties in your neighborhood. The check is free and takes about a minute.
Check your propertyCommon questions
- Does it cost anything to file a property tax appeal?
- No. Filing an appeal of your assessment with the Cook County Assessor, and later with the Board of Review, is free. You do not have to hire anyone to file on your own behalf.
- Can filing an appeal make my assessment go up?
- No. An assessment appeal can only lower your assessed value or leave it unchanged. The Assessor does not raise your assessment because you filed an appeal.
- How many times can I appeal in Leyden Township each year?
- Twice. Each cycle you can appeal first with the Cook County Assessor, and then, after that window closes, with the Cook County Board of Review. They are separate filings with separate deadlines.
- What does the free ParcelVue check show?
- It compares your home's assessed value with the median assessed value of similar properties in your neighborhood, and shows whether you appear to be assessed above that median. That comparison is the basis for a uniformity appeal.