In Benefit Overpayment Services, you can make a payment, view past payments, and set up an installment agreement to make monthly payments. Your letter must include your name, address, Social Security number, and why you disagree with the determination.Yes, if your employer overpaid you, you are generally required to repay the overpayment. This is because the overpayment was made in error. The salary overpayment resulted because . The Agency must immediately notify the employee, in writing, of the amount overpaid and the method of recovery. In the event an employee received an overpayment in wages, reimbursement to the City shall be accomplished by: Page 76. 71.