“492 Treatment of oil extraction activities etc. for tax purposes. (1) Where a person carries on as part of a trade — (a) any oil extraction activities; or (b) any of the following activities, namely, the acquisition, enjoyment or exploitation of oil rights; or (c) activities of both those descriptions, . those activities shall be treated, for the purposes of the charge of corporation tax on income, as a separate trade, distinct from all other activities carried on by him as part of the trade. (2) Relief in respect of a loss incurred by a person shall not be given under section 380 or 381 against income arising from oil extraction activities or from oil rights (“ring fence income”) except to the extent that the loss arises from such activities or rights. (3) Relief in respect of a loss incurred by a person shall not be given under section 393(A1) against his ring fence profits except to the extent that the loss arises from oil extraction activities or from oil rights. … (8) On a claim for group relief made by a claimant company in relation to a surrendering company, group relief shall not be allowed against the claimant company’s ring fence profits except to the extent that the claim relates to losses incurred by the surrendering company that arose from oil extraction activities or from oil rights.”
“501A Supplementary charge in respect of ring fenced trades 5 (1) Where in any accounting period … a company carries on a ring fence trade, a sum equal to 20 per cent of its adjusted ring fenced profits for that period shall be charged on the company as if it were an amount of corporation tax chargeable on the company. (2) A company’s adjusted ring fence profits for an accounting period are the amount which, on the assumption mentioned in subsection (3) below, would be determined for that period (in accordance with this Chapter) as the profits of the company’s ring fence trade chargeable to corporation tax. (3) The assumption is that financing costs are left out of account in computing – (a) the amount of the profits or loss of any ring fence trade of the company’s for each accounting period …; and (b) where for any such period the whole or part of any loss relief is surrendered to the company in accordance with section 492(8), the amount of that relief or, as the case may be, that part. … 501B Assessment, recovery and postponement of supplementary charge (1) Subject to subsection (3) below, the provisions of section 501A(1) relating to the charging of a sum as if it were an amount of corporation tax shall be taken as applying, subject to the provisions of the Taxes Acts, and to any necessary modifications, all enactments applying generally to corporation tax, including … (2) Accordingly (but without prejudice to subsection (1) above) the Management Act shall have effect as if any reference to corporation tax included a reference to a sum chargeable under section 501A(1) as if it were an amount of corporation tax. …” [12] Finally I should refer to the interpretation section, s.502: “502 Interpretation of Chapter V (1) In this Chapter — 6 … “oil extraction activities” means any activities of a person— (a) in searching for oil in the United Kingdom or a designated area or causing such searching to be carried out for him; or (b) in extracting or causing to be extracted for him oil at any place in the United Kingdom or a designated area under rights authorising the extraction and held by him or, if the person in question is a company, by the company or a company associated with it; or (c) in transporting or causing to be transported for him … oil extracted at any such place not on dry land under rights authorising the extraction and so held …; or (d) in effecting or causing to be effected for him the initial treatment or initial storage of oil won from any oil field under rights authorising its extraction and so held; … “ring fence income” means income arising from oil extraction activities or oil rights; and “ring fence profits” has the meaning given by sub-s.(1A) below or, in any case where that subsection does not apply, means ring fence income. (1A) Where in accordance with section 197(3) of the [TCGA 1992] a person has an aggregate gain for any chargeable period, that gain and his ring fence income (if any) for that period together constitute his ring fence profits for the purposes of this Chapter. …”