To request a tax refund, file an Application for Refund - Sales and Use Tax (Form DR-26S) or Application for Refund - All Other Taxes (Form DR-26). Report an overpayment.Complete an overpayment refund form to notify First Coast of an overpayment prior to receiving a demand letter. 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. It is the responsibility of the DPR to notify and review the overpayment letter with the employee. • Log into INFORMS. All applications for refund must contain: • A detailed explanation of how the refund amount was computed;. • The specific reason(s) for the refund request;. An overpayment can happen if there is an ineligibility notice, which disqualifies a claimant in certain cases where they have already received benefits. In order to process your refund, please submit the following: Application for refund of ad valorem taxes form DR462 (page 15).