An overpayment may occur when a claimant is paid unemployment insurance benefits and is later found to not be eligible for those benefits. IDES has the right to collect the overpaid amount from you.You have the right to appeal whether you were overpaid. Is there some waiver form I fill out? Do I just type out my own letter to appeal the overpayment with the reasons they mentioned? If you were overpaid on unemployment benefits from the Illinois Department of Employment Security (IDES), you may not have to pay that money back. The overpayment could result in a comptroller's offset of state payments (such as state income tax refunds and lottery winnings). In certain cases, a waiver request filed within 60 days will defer recovery of the overpayment from subsequent benefit payments.