110 ILCS 991/45
The State Treasurer may deduct from the salary, wages, commissions, and bonuses of any employee in this State and, to the extent permitted by the laws of the United States and individual states in which an employee might reside, any employee outside the State of Illinois by serving a notice of administrative wage garnishment on an employer, in accordance with rules adopted by the State
Treasurer, for the recovery of an education loan debt or income share agreement owned or serviced by the State Treasurer. Levy must not be made until the State Treasurer has caused a demand to be made on the employee, in a manner consistent with rules adopted by the State Treasurer, such that the employee is provided an opportunity to contest the existence or amount of the income share agreement or education loan obligation.
110 ILCS 991/45