ALL SALES TAX REFUNDS: Please send all sales tax refund requests to the Department of Treasury, Technical Services Section,. It's important that you also include a completed refund form.This completed form allows us to apply the refund to the correct claim overpayment. 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. Select "Request Restitution Waiver for Financial Hardship" and fill out the application.