Our document template is designed to make the process of writing an "Inform a Customer of an Overpayment" letter quick, easy, and stress-free. 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 service provides various examples of refund letters, including sample overpayment letters, refund request letters, and more. In this article, we'll provide tips on how to handle refund request letters and 7 sample templates you can use to get started today! The salary overpayment resulted because . We have identified the following overpayment and are in good faith voluntarily refunding all monies collected in error. An overpayment of benefits can occur for a number of reasons. Knowing how they can occur can help you avoid such a circumstance. The information in the waiver letter should accompany the UI Online form that requests financial information and includes the claimant's bar code.