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.Our document template is designed to make the process of writing an "Inform a Customer of an Overpayment" letter quick, easy, and stress-free. Example: An out of state resident assigns title to son and indicates vehicle is a gift. Taxes for which a refund is allowed under G.S. 105-164.14(c) are not an overpayment of tax and do not accrue interest. Fill out VA Form 21-2680 (Examination for. Housebound Status or Permanent Need for.