Overpayments. To receive important letters about overpayment recovery waivers, please ensure your mailing address is updated in your IDES account. 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? The client will have 30 days from the date of the Overpayment letter to submit the request and supporting documents. Click here to search for any overpayments on your PIN. I get this letter from them about a repayment agreement.