How do I appeal an overpayment? Where can I find more information about my particular overpayment?DES will send you a form letter called a Determination of Overpayment. This letter specifies the weeks and amount that DES alleges you were overpaid. This document explains waiver and offers tips to claimants seeking one with the Arizona Department of Economic Security ("DES"). Tens of thousands of Arizonans have learned that they have to pay back their unemployment to DES, due to no fault of their own. On Friday, May 24, we sent NOPCs to correct increases in Limited Property Values as a result of the Qasimyar V. Maricopa County class action lawsuit.