In assessing the income tax chargeable under any Schedule on a member of the clergy or minister of any religious denomination, the following deductions may be made from any profits, fees or emoluments of his or her profession -

(a) any sums of money paid or expenses incurred by him or her wholly, exclusively and necessarily in the performance of his or her duty as a member of the clergy or minister of any religious denomination;

(b) such part of the rent (not exceeding one-eighth), as the inspector by whom the assessment is made may allow, paid by him or her in respect of a dwelling house any part of which is used mainly and substantially for the purposes of his or her duty as a member of the clergy or minister of any religious denomination.