The salary overpayment resulted because . This brief but important letter notifies a customer that he or she has overpaid you.It can serve as a very good customer relations letter. Whether the overpayment notification letter to the customer is a system generated letter (Notice 18) or a manual letter it must state the following information: To determine the overpayment amount take the "Amount Recvd" and subtract the "Right Amt". This amount will appear in the "Current Overpaid" column. Only citizens with documented potential overpayments will receive a notice. We have identified the following overpayment and are in good faith voluntarily refunding all monies collected in error. Write a letter to the Social Security Administration. Tell them how much you can afford to pay each month.