§ 4043.23 Active participant reduction.

(a) Reportable event. A reportable event occurs for a plan:

(1) Single-cause event. (i) On each date in a plan year when, as a result of a new single cause, the ratio of the aggregate number of individuals who ceased to be active participants because of that single-cause, to the number of active participants at the beginning of such plan year, exceeds 20 percent.

(ii) Examples of single-cause events include a reorganization or restructuring, the discontinuance of an operation or business, a natural disaster, a mass layoff, or an early retirement incentive program.

(2) Attrition event. At the end of a plan year if the sum of the number of active participants covered by the plan at the end of such plan year, plus the number of individuals who ceased to be active participants during the same plan year that are reported to PBGC under paragraph (a)(1) of this section, is less than 80 percent of the number of active participants at the beginning of such plan year.

(b) Determination rules—(1) Determination dates. The number of active participants at the beginning of a plan year may be determined by using the number of active participants at the end of the previous plan year, and the number of active participants at the end of a plan year may be determined by using the number of active participants at the beginning of the next plan year.

(2) Active participant. “Active participant” for purposes of this section means a participant who—

(i) Is receiving compensation from any member of the plan's controlled group for work performed for any member of the plan's controlled group;

(ii) Is on paid or unpaid leave granted for a reason other than a layoff;

(iii) Is laid off from work for a period of time that has lasted less than 30 days; or

(iv) Is absent from work due to a recurring reduction in employment that occurs at least annually.