An overpayment claimed on a return may be applied as a credit for your next year's estimated tax or you may request that it be refunded to you. Refund Letter Format: Requesting someone for the refund of your amount paid?MassTaxConnect makes it easy, convenient, and secure for you to make payments. If the DUA says that you were overpaid, you can challenge their decision. You can also challenge the amount of the overpayment. 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. Good faith effort to refund. The creditor must take positive steps to return any credit balance that has remained in the account for over 6 months.