735 ILCS 5/12-809: Offsetting claims.

The employer is entitled to assert against indebtedness due to the judgment debtor offsetting claims against either or both the judgment creditor and the judgment debtor, whether (1) due at the time of service of the summons or thereafter to become due and (2) liquidated or unliquidated, except demands for unliquidated claims for actions sounding in tort. The employer is liable for the balance of indebtedness due the judgment debtor after the offsetting claims are adjusted. The verdict or finding and judgment shall show the amount of offsetting claims or deductions allowed against each party.