The Principal Act is amended in Chapter 2 of Part 2 by the insertion of the following section after section 22:

"22A.

(1) In this section -

'income from the sale of goods', in relation to an accounting period of a company, means such income as is income from the sale of those goods in the course of a trade carried on by the company for the purposes of a claim under section 448(3);

'net relevant trading income', in relation to an accounting period of a company, means the excess of the amount of relevant trading income of the company for the accounting period over the aggregate of the amounts of -

(a) relevant charges on income paid by the company in the accounting period, and

(b) any relevant trading loss incurred by the company in the accounting period;

'relevant charges on income', in relation to an accounting period of a company, means the charges on income paid by the company in the accounting period wholly and exclusively for the purposes of a trade carried on by the company other than so much of those charges as are -

(a) charges on income paid for the purposes of the sale of goods within the meaning of section 454, or

(b) charges on income paid for the purposes of an excepted trade within the meaning of section 21A;