pay period
For purposes of this chapter, if the services performed during one-half or more of any pay period by an employee for the person employing him constitute employment, all the services of such employee for such period shall be deemed to be employment; but if the services performed during more than one-half of any such pay period by an employee for the person employing him do not constitute employment, then none of the services of such employee for such period shall be deemed to be employment. As used in this subsection, the term “pay period” means a period (of not more than 31 consecutive days) for which a payment of remuneration is ordinarily made to the employee by the person employing him. This subsection shall not be applicable with respect to services performed in a pay period by an employee for the person employing him, where any of such service is excepted by subsection (b)(9).