“Any income, so far as it falls within— (a) any Chapter of this Part, and (b) Chapter 2 of Part 2 (receipts of a trade, profession or vocation), is dealt with under Part 2.”
“Income becomes a trading receipt when it arises from capital activity employed and at risk in the business, capital which is employed in the business because it is required for its support or, perhaps, to attract customers looking to the credit of the business. Trading income is ‘the fruit’ of the capital employed in the business in a present and active sense.”