If an overpayment is not discovered and one or more paydays have passed, the employer and employee shall agree on a repayment schedule. Overpayments. To receive important letters about overpayment recovery waivers, please ensure your mailing address is updated in your IDES account.The salary overpayment resulted because . . . ………….. The Firm successfully resolved cases. They should include their UIN on the check along with a copy of the notice. Illinois unemployment overpayment notices from IDES tell some recipients to pay back tens of thousands of dollars ABC7 Chicago. However, in order for our office to do so, your consent is required. Please carefully read the options below and select the one to which you consent.