To apply for a tax refund, the taxpayer or representative must complete Sections 1 through 5 of this application. We have identified the following overpayment and are in good faith voluntarily refunding all monies collected in error.In order for an overpayment refund to be processed in a timely manner, please submit a completed form with all refund checks and supporting documentation. The Tax Office holds unclaimed property tax overpayments made within the last three years and outstanding (uncashed) refund checks. How to fill out the Overpayment Refund Notification Form? 1. Download the Overpayment Refund Notification Form. 2. When you identify a Medicare overpayment, use the Overpayment Refund Formto submit the voluntary refund. 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. Taxpayers use Form 843 to claim a refund (or abatement) of certain overpaid (or overassessed) taxes, interest, penalties, and additions to tax.