(1) In this section -
'relevant corporation tax', in relation to an accounting period of a company, means the corporation tax which, apart from this section and sections 239, 241, 396B, 420B, 440 and 441, would be chargeable on the company for the accounting period;
'relevant trading charges on income' has the same meaning as in section 243A.
(2) Where a company pays relevant trading charges on income in an accounting period and the amount so paid exceeds an amount equal to the aggregate of the amounts allowed as deductions against the income of the company for the accounting period in accordance with section 243A, then the company may claim relief under this section for the accounting period in respect of the excess.
(3) Where for any accounting period a company claims relief under this section in respect of the excess, the relevant corporation tax of the company for the accounting period shall be reduced, in so far as the excess consists of relevant trading charges, by an amount dete
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