Example. M, a duly ordained minister, is engaged to perform service as chaplain at N University. M devotes his entire time to performing his duties as chaplain which include the conduct of religious worship, offering spiritual counsel to the university students, and teaching a class in religion. M is performing service in the exercise of his ministry.
Example. M, a duly ordained minister, is engaged by the N Religious Board to serve as director of one of its departments. He performs no other service. The N Religious Board is an integral agency of O, a religious organization operating under the authority of a religious body constituting a church denomination. M is performing service in the exercise of his ministry.
Example. M, a duly ordained minister, is assigned by X, the religious body constituting his church, to perform advisory service to Y Company in connection with the publication of a book dealing with the history of M's church denomination. Y is neither a religious organization nor operated as an integral agency of a religious organization. M performs no other service for X or Y. M is performing service in the exercise of his ministry.
Example. M, a duly ordained minister, is engaged by N University to teach history and mathematics. He performs no other service for N although from time to time he performs marriages and conducts funerals for relatives and friends. N University is neither a religious organization nor operated as an integral agency of a religious organization. M is not performing the service for N pursuant to an assignment or designation by his ecclesiastical superiors. The service performed by M for N University is not in the exercise of his ministry. However, service performed by M in performing marriages and conducting funerals is in the exercise of his ministry.
26 C.F.R. §31.3401(a)(9)-1