Accumulation plan.
Accumulation plan. Accumulation plan means a defined benefit plan under which the benefit of every employee for each plan year is separately determined, using plan year compensation (if benefits are determined as a percentage of compensation rather as than a dollar amount) separately calculated for the plan year, and each employee's total accrued benefit as of the end of a plan year is the sum of the separately determined benefit for that plan year and the total accrued benefit as of the end of the preceding plan year.