§ 2530.200b-1 Computation periods.

(a) General. Under sections 202, 203 and 204 of the Act and sections 410 and 411 of the Code, an employee's statutory entitlements with regard to participation, vesting and benefit accrual are generally determined by reference to years of service and years of participation completed by the employee and one-year breaks in service incurred by the employee. The units used for determining an employee's credit towards statutory participation, vesting and benefit accrual entitlements are in turn defined in terms of the number of hours of service credited to the employee during a specified period—in general, a twelve-consecutive-month period—referred to herein as a “computation period”. A plan must designate eligibility computation periods pursuant to § 2530.202–2 and vesting computation periods pursuant to § 2530.203–2, and, under certain circumstances, a defined benefit plan must designate accrual computation periods pursuant to § 2530.204–2. An employee who is credited with 1000 hours of service during an eligibility computation period must generally be credited with a year of service for purposes of section 202 of the Act and section 410 of the Code (relating to minimum participation standards). An employee who is credited with 1000 hours of service during a vesting computation period must generally be credited with a year of service for purposes of section 203 of the Act and 411(a) of the Code (relating to minimum vesting standards). An employee who completes 1000 hours of service during an accrual computation period must, under certain circumstances, be credited with at least a partial year of participation for purposes of section 204 of the Act and section 411(b) of the Code (relating to benefit accrual requirements). With respect to benefit accrual, however, the plan may not be required to credit an employee with a full year of participation and, therefore, full accrual for such year of participation unless the employee is credited with the number of hours of service or other permissible units of credit prescribed under the plan for crediting of a full year of participation (see § 2530.204–2 (c) and (d)). It should be noted that under some of the equivalencies which a plan may use under § 2530.200b–3 to determine the number of units of service to be credited to an employee in a computation period, an employee must be credited with a year of service of partial year of participation if the employee is credited with a number of units of service which is less than 1000 in a computation period. See also § 2530.200b–9, relating to elapsed time.