168Meaning of “the relevant accounting period”E+W+S+N.I.
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(1)For the purpose of determining the proportion of profits or assets to which company A would be beneficially entitled as mentioned in section 165(2) or 166(2) at any time, “the relevant accounting period” is the accounting period of company B in which that time falls.
(2)If company B is non-UK resident and is not within the charge to corporation tax, the relevant accounting period is to be determined using the assumption in subsection (3).
(3)The assumption is that company B became UK resident (and, therefore, within the charge to corporation tax) at the time it became a 75% subsidiary (as mentioned in section 136) ignoring section 151(4).