We have identified the following overpayment and are in good faith voluntarily refunding all monies collected in error. There has been an error in your favor!• Complete this form in its entirety to request a refund of a payment made to OATH. 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. Please fill in all the information required on the enclosed form then sign and date where indicated. Please download the form, complete each field and print. Include the form with your refund so we can properly apply the refund and record the receipt. Form TR210 is a letter you receive if: If you received it, you may be entitled to a refund for the tax year stated on the letter.