You may figure a credit for Illinois Property Tax paid if
You may not figure a credit for Illinois Property Tax
For more information, please see Publication 108, Illinois Property Tax Credit.
Note: You must include your Property Index Number on Schedule ICR, Illinois Credits, if you are claiming a property tax credit. You may get this number from your property tax bill, your assessment notice, your mortgage lender (if your property taxes are escrowed), or from the county assessor's office in which the property is located.
In some counties this number is also referred to as the parcel number or permanent number.
Failure to provide this information will result in processing and refund delays.