305 ILCS 5/10-10.1
In all cases instituted by the Illinois Department on behalf of a child or spouse, other than one receiving a grant of financial aid under Article IV, on whose behalf an application has been made and approved for child support enforcement services as provided by Section 10-1, the court shall impose a collection fee on the individual who owes a child or spouse support obligation in an amount equal to 10% of the amount so owed as long as such collection is required by federal law, which fee shall be in addition to the support obligation. The imposition of such fee shall be in accordance with provisions of Title IV, Part D, of the Social Security Act and regulations duly promulgated thereunder. The fee shall be payable to the clerk of the circuit court for transmittal to the Illinois Department and shall continue until child support enforcement services are terminated by the Department.
305 ILCS 5/10-10.1