25.—(1) For the purposes of regulation 20 (average weekly earnings of employed earners), the earnings of a relevant person derived from employment as an employed earner to be taken into account shall, subject to paragraph (2), be his net earnings as determined under paragraph (3).
(2) There shall be disregarded from a relevant person’s net earnings, any sum, where applicable, specified in paragraphs 1 to 14 of Schedule 2 (sums to be disregarded in the determination of earnings).
(3) For the purposes of paragraph (1) net earnings shall be determined by taking into account the gross earnings of the relevant person from that employment over the assessment period, less—
(a)any amount deducted from those earnings by way of—
(i)income tax,
(ii)primary Class 1 contributions under Part I of the 1992 Act;
(b)one-half of any sum paid by the relevant person by way of a contribution towards an occupational pension scheme;
(c)one-half of the amount calculated in accordance with paragraph (4) in respect of any qualifying contribution payable by the relevant person; and
(d)where those earnings include a payment which is payable under any enactment having effect in Northern Ireland and which corresponds to statutory sick pay or statutory maternity pay, any amount deducted from those earnings by way of any contributions which are payable under any enactment having effect in Northern Ireland and which correspond to primary Class 1 contributions under the 1992 Act.
(4) The amount in respect of any qualifying contribution shall be calculated by multiplying the daily amount of the qualifying contribution by the number equal to the number of days in the assessment period; and for the purposes of this regulation the daily amount of the qualifying contribution shall be determined—
(a)where the qualifying contribution is payable monthly, by multiplying the amount of the qualifying contribution by 12 and dividing the product by 365;
(b)in any other case, by dividing the amount of the qualifying contribution by the number equal to the number of days in the period to which the qualifying contribution relates.
(5) In this regulation “qualifying contribution” means any sum which is payable periodically as a contribution towards a personal pension scheme.