Illinois Comptroller Dan Hynes has pegged the state's backlog of unpaid bills at $4.2 billion, of which $725 million is owed to elementary and secondary schools. The late school payments break down as follows: $372 million is owed for special education, $153 million for transportation, $25 million for textbooks, $5 million for meals, $5 million for summer school, and $164 million for other expenses.