defined in section 3231(e) of such Code). For purposes of the preceding sentence (other than for purposes of subsection (b)(2)), wages as defined in section 3121(a) of such Code shall be determined without regard to paragraphs (1), (8), (10), (13), (18), (19), and (22) of section 3121(b) of such Code. (B) Allowance for certain health plan expenses (i) In general Such term shall include amounts paid or incurred by the eligible employer to provide and maintain a group health plan (as defined in section 5000(b)(1) of the Internal Revenue Code of 1986), but only to the extent that such amounts are excluded from the gross income of employees by reason of section 106(a) of such Code. (ii) Allocation rules For purposes of this section, amounts treated as wages under clause (i) shall be treated as paid with respect to any employee (and with respect to any period) to the extent that such amounts are properly allocable to such employee (and to such period) in such manner as the Secretary may prescribe. Except as otherwise provided by the Secretary, such allocation shall be treated as properly made if made on the basis of being pro rata among periods of coverage. (6) Employer The term employer means any employer (as defined in section 3401(d) of such Code) of at least one employee on any day in calendar year 2020. (7) Other terms Except as otherwise provided in this section, any term used in this section which is also used in chapter 21 or 22 of the Internal Revenue Code of 1986 shall have the same meaning as when used in such chapter. (d) Aggregation rule All persons treated as a single employer under subsection (a) or (b) of section 52 of the Internal Revenue Code of 1986, or subsection (m) or (o) of section 414 of such Code, shall be treated as one employer for purposes of this section. (e) Denial of double benefit For purposes of chapter 1 of such Code, the gross income of any eligible employer, for the taxable year which includes the last day of any calendar quarter with respect to which a credit is allowed under this