Accrued future service benefit

that portion of determining pension benefits costs under which the actuarial costs are based directly upon benefits accrued to the date of cost determination. Such benefits are determined either by the terms of the plan or by some assumed allocation of total prospective benefits to years of service. When the annual cost of the plan for a given year is calculated the method assumes that a precisely determinable unit of benefit is associated with that year of a participant's credited service.- The Insurance Dictionary 3rd Edition