The amount that is owed to the Fund is mainly due to either an error in a salary deduction made by your payroll department or an overpayment of a prior benefit (usually a disability benefit). Historically, for errors in salary deductions, the balance owed is recouped at the time of retirement or separation from service. For disability, an overpayment is recovered by reducing future disability payments, or recouped at the time of retirement or separation from service.