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. The IRS uses Letter 3286C to inform you that they believe you may have overpaid for a particular year and will refund you the difference. The salary overpayment resulted because . You'll get a letter explaining how to Repay and manage benefit money you owe. This memorandum serves as notification of an overpayment of wages that you received and the subsequent repayment that is your responsibility. However, you can also fax your appeal to 801-526-9242, or mail your appeal to Appeals Unit, P.O. Box 45244, Salt Lake. City, UT 84145-0244.