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.This memorandum serves as notification of an overpayment of wages that you received and the subsequent repayment that is your responsibility. The salary overpayment resulted because . Be sure to include your parcel or account number in the email. For the open invoice in the Payment column, enter how much of the credit you want to apply. One-half of your weekly benefit payment will be deducted and applied to your overpayment. See OVERPAYMENTS for additional information. Please see Paying Child Support to learn how to make a payment.