Nonprofit organizations must employ 4 or more
3 rules
This section shall not apply to service performed during any calendar year in the employ of any organization unless on each of some 20 days during such calendar year or the preceding calendar year, each day being in a different calendar week, the total number of individuals who were employed by such organization in employment (determined without regard to section 3306(c)(8) and by excluding service to which this section does not apply by reason of subsection (b)) for some portion of the day (whether or not at the same moment of time) was 4 or more.