This brief but important letter notifies a customer that he or she has overpaid you. It can serve as a very good customer relations letter.An overpayment may occur when a claimant is paid unemployment insurance benefits and is later found to not be eligible for those benefits. Providers have the option to submit a Request For Extended Repayment Schedule (ERS). A complete ERS request should be submitted immediately. The salary overpayment resulted because . You do not need to respond to this letter. If you have an overpayment, it will be refunded in the method you requested. You must submit proof that you paid the taxes for the Tax Year and Installment when the overpayment occurred. •. If we have identified an overpayment and request a refund, please mail the check along with a copy of the overpayment request letter we sent you.