52(1)This paragraph applies where one or more of Cases A to D apply.
(2)Case A applies where a member of the claimant’s group has an unpaid liability to tax.
(3)Case B applies where the claimant is seeking or will be able to seek relief by taking other steps under this Part of this Act.
(4)Case C applies where the claimant—
(a)could have sought relief by taking such steps within a period that has now expired, and
(b)knew, or ought reasonably to have known, before the end of that period that such relief was available.
(5)Case D applies where—
(a)the amount paid is excessive by reason of a mistake in calculating the amount of tax payable by members of the claimant’s group for the accounting period, and
(b)the amount was calculated in accordance with the practice generally prevailing at the time.
(6)Where this paragraph applies, the Commissioners are not liable to repay any amount paid by way of multinational top-up tax by reason of the fact it was not tax due.