321. Provisions of general application in relation to the making of allowances and charges.

(1) Subsections (2) to (7) shall apply for the interpretation of -

(a) this Part,

(b) section 374,

(c) sections 658 to 660,

(d) Chapter 1 of Part 24,

(e) sections 764 and 765,

(f) section 769, and

(g) any other provision of the Tax Acts relating to the making of allowances or charges under or in accordance with the provisions referred to in paragraphs (a) to (f).

(2) "Chargeable period" means an accounting period of a company or a year of assessment, and - (a) a reference to a chargeable period or its basis period is a reference to the chargeable period if it is an accounting period and to the basis period for it if it is a year of assessment (b) a reference to a chargeable period related to expenditure, or a sale or other event, is a reference to the chargeable period in which, or to that in the basis period for which, the expenditure is incurred or the sale or other event takes place, and means the latter only if the chargeable period is a year of assessment.

(2A) Subject to se

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