“Where a company begins or ceases— (a) to carry on a trade, or (b) to be within the charge to corporation tax in respect of a trade, the company’s income shall be computed for the purposes of corporation tax as if that were the commencement or, as the case may be, the discontinuance of the trade, whether or not the trade is in fact commenced or discontinued.”
“(1) Where, on a company (‘the predecessor’) ceasing to carry on a trade, another company (‘the successor’) begins to carry it on, and— (a) on or at any time within two years after that event the trade or an interest amounting to not less than a three-fourths share in it belongs to the same persons as the trade or such an interest belonged to at some time within a year before that event; and (b) the trade is not, within the period taken for the comparison under paragraph (a) above, carried on otherwise than by a company which is within the charge to tax in respect of it; then the Corporation Tax Acts shall have effect subject to subsections (2) to (6) below. In paragraphs (a) and (b) above references to the trade shall apply also to any other trade of which the activities comprise the activities of the first mentioned trade. … (3) … the successor shall be entitled to relief under section 393(1), as for a loss sustained by the successor in carrying on the trade, for any amount for which the predecessor would have been entitled to relief if it had continued to carry on the trade.”
“(8) Where, on a company ceasing to carry on a trade, another company begins to carry on the activities of the trade as part of its trade, then that part of the trade carried on by the successor shall be treated for the purposes of this section as a separate trade, if the effect of so treating it is that subsection (1) … above has effect on that event in relation to that separate trade; and where, on a company ceasing to carry on part of a trade, another company begins to carry on the activities of that part as its trade or part of its trade, the predecessor shall for purposes of this section be treated as having carried on that part of its trade as a separate trade if the effect of so treating it is that subsection (1) … above has effect on that event in relation to that separate trade. (9) Where under subsection (8) above any activities of a company’s trade fall, on the company ceasing or beginning to carry them on, to be treated as a separate trade, such apportionments of receipts, expenses, assets or liabilities shall be made as may be just.…”