(b) General rule. In the case of an organization that is exempt from tax under
section 501(a) (an exempt organization) whose employees participate in a plan, the employer with respect to that plan includes the exempt organization whose employees participate in the plan and any other organization that is under common control with that exempt organization. For this purpose, common control exists between an exempt organization and another organization if at least 80 percent of the directors or trustees of one organization are either representatives of, or directly or indirectly controlled by, the other organization. A trustee or director is treated as a representative of another exempt organization if he or she also is a trustee, director, agent, or employee of the other exempt organization. A trustee or director is controlled by another organization if the other organization has the general power to remove such trustee or director and designate a new trustee or director. Whether a person has the power to remove or designate a trustee or director is based on facts and circumstances. To illustrate the rules of this paragraph (b), if exempt organization A has the power to appoint at least 80 percent of the trustees of exempt organization B (which is the owner of the outstanding shares of corporation C, which is not an exempt organization) and to control at least 80 percent of the directors of exempt organization D, then, under this paragraph (b) and
§ 1.414(b)-1, entities A, B, C, and D are treated as the same employer with respect to any plan maintained by A, B, C, or D for purposes of the sections referenced in
section 414(b), (c), (m), (o), and (t).