Notwithstanding anything in Rule 3 of the Rules applicable to Cases I and II of Schedule D, where, after the appointed day, a person carrying on a trade—
(a)incurs expenditure not of a capital nature on scientific research related to that trade and directly undertaken by him or on his behalf ; or
(b)pays any sum to any scientific research association for the time being approved for the purposes of this section by the appropriate Research Council or Committee, being an association which has as its object the undertaking of scientific research related to the class of trade to which the trade he is carrying on belongs ; or
(c)pays any sum to be used for such scientific research as is mentioned in the last preceding paragraph to any such university, college, research institute or other similar institution as is for the time being approved for the purposes of this section by the appropriate Research Council or Committee,
the expenditure incurred or sum paid, as the case may be, may be deducted as an expense in computing the profits or gains of the trade for the purposes of income tax.