Overpayments. To receive important letters about overpayment recovery waivers, please ensure your mailing address is updated in your IDES account. Click here to search for any overpayments on your PIN.Include all written documentation to support or defend that an overpayment occurred. The Municipal Code of Chicago provides that the titleholder of record is responsible for all utility billing account charges up to the date of foreclosure. When you identify a Medicare overpayment, use the Overpayment Refund Formto submit the voluntary refund. If you were overpaid on unemployment benefits from the Illinois Department of Employment Security (IDES), you may not have to pay that money back. Chicago Teachers Union is intervening to protect the rights of Chicago public school teachers who were allegedly overpaid due to a CPS payroll error. List of the UTIs used on the Payment Stub shown below in their order of sequence. The Payment Stub is not generated when PCOC is 8. It's important that you also include a completed refund form.