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.The salary overpayment resulted because . This memorandum serves as notification of an overpayment of wages that you received and the subsequent repayment that is your responsibility. This form is for general instructions that apply to all corporation tax forms. It includes a variety of topics about how to fill out your form. Dear Mr. Campling: We received your prompt payment for the July 10 statement of your Visa card.