The State distributes over 700 million dollars annually to School Districts using allocations from 1977. The dollar amount ranges from $0 to $8,500 per student.
The below link provides additional information from the Illinois Department of Revenue on Corporate Personal Property Replacement Tax (CPPRT).
Note: For foundation level (lower property value) school districts CPPRT is taken into consideration as part of the State Aid calculation. It is not really factored in much for alternate or flat grant school districts (higher property value).
The chart below shows the wide disparity in CPPRT funding for School Districts located in Will County.