The binding legal principles established are: (1) When determining whether expenditure is incurred in the production of income under s 11(a) and wholly and exclusively for purposes of trade under s 23(g), the purpose of the expenditure is the decisive consideration; (2) Where a close corporation makes a distribution to its sole member and simultaneously borrows back an equivalent amount, and these transactions are interdependent (neither intended to exist without the other), the true purpose of the borrowing must be examined; (3) If the corporation had sufficient funds to finance its income-earning operations without borrowing, but chose to make a distribution and simultaneously borrow back the same amount at interest, the interest is not deductible because the true purpose of the loan was to enable the distribution, not to finance income-producing activities; (4) When examining the purpose of a close corporation's transactions, the personal motives and obligations of its controlling member are relevant - 'a man does not change his mind when he changes his hat'; (5) Interest paid on a loan raised to enable a dividend or distribution to be made is not expenditure incurred in the production of income and is not deductible; (6) Where expenditure serves a dual purpose, one of which has no bearing on the taxpayer's trade, the deduction is prohibited by s 23(g).