The notice will provide the tax type from which the overpayment originated and tax type to which it is being applied. We have identified the following overpayment and are in good faith voluntarily refunding all monies collected in error.In this article, we'll show you how to write a refund request letter template that not only grabs attention but also persuades companies to act in your favor. The salary overpayment resulted because . Even if you have employer withholding or are not expecting a refund, you must still file a return. What should I do if my support case is overpaid? The Court must address overpayments in a support case pursuant to PA Rule of Civil Procedure 1910.19(g). 1. Read the letter thoroughly to understand the context.