In some instances, members of the Massachusetts State Employees' Retirement System (MSERS) may be eligible to add to their creditable service with a buyback of prior service. Examples of potential service that may qualify for a buyback includes prior refunded service, contract service, and military service. In order to purchase creditable service, you must currently be an active member-in-service of the MSERS at the time of your application. The service purchase must be paid in full prior to you receiving a retirement benefit. We strongly recommend you apply to purchase service early as it often takes time to process service purchase requests, and interest costs increase over time.