To receive important letters about overpayment recovery waivers, please ensure your mailing address is updated in your IDES account. Chicago, Illinois 60673-1285.Those who received letters from IDES stating they were overpaid state unemployment, must first find out if they are eligible for the waiver. Name: Relationship: IMPORTANT: Please answer the following questions as completely as you can and submit any supporting documents with your waiver request. To do this, fill out the Request for Change in Overpayment Recovery Rate form.