Where by virtue of subsection (1)(a) above corporation tax for an accounting period of a company is due without the making of an assessment, the amount for the time being shown in a return by the company under section 11 of the Management Act (corporation tax return) as the corporation tax for the period shall be treated for the purposes of Part VI of the Management Act (collection and recovery) as tax charged and due and payable under an assessment on the company.

If, apart from this subsection, a claim would fall to be made under subsection (3) above at a time when the company concerned has appealed against such an assessment as is referred to in paragraph (b) of that subsection but that appeal has not been finally determined, that subsection shall have effect as if, for the words from “make a claim” to “excess”, there were substituted “apply to the Commissioners to whom the appeal stands referred for a determination of the amount which should be repaid to the company pending a determination of the company’s liability for the accounting period in question”; and such an application shall be determined in the same way as the appeal.

Where on an appeal against an assessment to corporation tax a company makes an application under section 55(3) or (4) of the Management Act (postponement of tax charged but not paid etc.), that application may be combined with an application under subsections (3) and (4) above (relating to tax which was paid prior to the assessment).