Sch 13 para 3
(1) Paragraphs 1 and 2 apply for the purpose of determining the maximum allowance under section 51K of CAA 2001 (operation of annual investment allowance where restrictions apply) in a case where one or more chargeable periods in which the relevant AIA qualifying expenditure is incurred are chargeable periods within paragraph 1(1) or 2(1). (2) There is to be taken into account for that purpose only chargeable periods of one year or less (whether or not they are chargeable periods within paragraph 1(1) or 2(1)), and, if there is more than one such period, only that period which gives rise to the greatest maximum allowance. (3) Sub-paragraph (4) applies to a chargeable period if— (a) it is longer than one year, and (b) any part of the chargeable period is within the period beginning with 1 January 2019 and ending with 31 March 2023 . (4) For the purposes of sub-paragraph (2) the chargeable period (the “relevant period”) is to be divided into two periods, as follows— (a) a chargeable period of one year ending when the relevant period ends, and (b) a chargeable period consisting of so much of the relevant period as is not within paragraph (a). (5) Nothing in this paragraph affects the operation of sections 51M and 51N of CAA 2001.