5In section 58 (allocation of qualifying expenditure to pools), after subsection (4) insert—
“(4A)If an annual investment allowance is made to a person for a chargeable period—
(a)the AIA qualifying expenditure in respect of which the allowance is made must be allocated to the appropriate pool (or pools) in that chargeable period, and
(b)the available qualifying expenditure in a pool to which the expenditure (or some of it) is allocated is reduced by the amount of that expenditure.”