This chapter deals with state law provisions for identifying, establishing, and collecting Unemployment. Insurance (UI) benefit overpayments."The Help Center allows claimants to request Federal Overpayment Waivers, appeal an overpayment decisions, and repay overpayments. In the Empl ID field, enter the Employee's 8-digit Numeric Identification Number. • In the Pay Period End Date field, enter the Pay Period End Date. 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).