Employees in full-time and part-time 20-plus hour positions are eligible for benefits under the County's Section 125 Benefit Plan. DEFINITIONS. 2.1. Account or Account Balance. 2. 2.2.Accounting Year. 2. 2.3. When you begin participating in the Cash Balance Pension Plan, your Human Resources. The FRS Pension Plan is a defined benefit plan, in which you are guaranteed a benefit at retirement if you meet certain criteria. Division of Retirement. Defined benefit plans provide a fixed, pre-established benefit for employees at retirement. The deadline for completing a mandatory 403B Plan restatement passed on December 31, 2009 and. The FRS offers employees two retirement plan options - the Investment Plan and the Pension Plan.