18(1)Where a trade is carried on by persons in partnership, entitiement to relief or liability to charge under this Schedule is a joint entitlement or liability, and any claim for relief under this Schedule shall be a single claim made in the partnership name.
(2)Where none of those persons is a company, entitlement to relief and liability to charge under this Schedule shall be ascertained and given effect as if the trade were carried on by an individual.
(3)Where any of those persons is a company, entitlement to relief and liability to charge under this Schedule shall be ascertained as if the partnership were a company and shall be given effect in accordance with the following provisions of this paragraph.
(4)A company's share in any such entitlement or liability in any accounting period of the partnership shall be determined according to the interests of the partners during that period, and shall be given effect as if the share derived from a trade carried on by the company alone in its corresponding accounting period or periods.
In this sub-paragraph " corresponding accounting period or periods " means the accounting period or periods of the company comprising or together comprising the accounting period of the partnership, and any necessary apportionment shall be made between corresponding accounting periods if more than one.
(5)The share in any such entitlement or liability of the partner or partners other than companies shall be given as if that share derived from a trade carried on by him, or, as the case may be, by them in partnership, otherwise than in partnership with a company.