(5) Eligible employer For purposes of this subsection— (A) In general The term “eligible employer” means, with respect to any year, any employer if such employer employed an average of 100 or fewer employees on business days during either of the 2 preceding years. For purposes of this subparagraph, a year may only be taken into account if the employer was in existence throughout the year. (B) Employers not in existence during preceding year If an employer was not in existence throughout the preceding year, the determination under subparagraph (A) shall be based on the average number of employees that it is reasonably expected such employer will employ on business days in the current year. (C) Growing employers retain treatment as small employer (i) In general If— (I) an employer was an eligible employer for any year (a “qualified year”), and (II) such employer establishes a simple cafeteria plan for its employees for such year, then, notwithstanding the fact the employer fails to meet the requirements of subparagraph (A) for any subsequent year, such employer shall be treated as an eligible employer for such subsequent year with respect to employees (whether or not employees during a qualified year) of any trade or business which was covered by the plan during any qualified year. (ii) Exception This subparagraph shall cease to apply if the employer employs an average of 200 or more employees on business days during any year preceding any such subsequent year. (D) Special rules (i) Predecessors Any reference in this paragraph to an employer shall include a reference to any predecessor of such employer. (ii) Aggregation rules All persons treated as a single employer under subsection (a) or (b) of section 52, or subsection (n) or (o) of section 414, shall be treated as one person.