(1)Where a claim which—
(a)is made under Schedule 5 or Schedule 6 to the principal Act for the allowance of any expenditure, and
(b)is received by the Board after 16th March 1993,
has been allowed, the expenditure shall not be brought into account in determining the assessable profit or allowable loss of any chargeable period which ends earlier than the last day of the claim period in which the expenditure was incurred.
(2)Where a claim has been made under Schedule 7 to the principal Act for the allowance of any expenditure incurred after 31st March 1993 and that claim has been allowed, the expenditure shall not be brought into account in determining the assessable profit or allowable loss of any chargeable period which ends before the date on which the expenditure was incurred.
(3)The preceding provisions of this section have effect notwithstanding anything in subsection (9) of section 2 of the principal Act (under which expenditure which had been allowed might in certain cases be taken into account in earlier chargeable periods) and, accordingly, at the beginning of that subsection there shall be inserted “ Subject to section 192 of the Finance Act 1993 ”.