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GENERAL DEDUCTION FORMULA
Negative test
It was unthinkable that the taxpayer should not
comply with the Sullivan Code and concluded
that the expenses were incurred for the
performance of the taxpayer’s income-
producing operations and formed part of the
cost of performing it. This meant that the
expenditure had been ‘incurred for the purposes
of trade and for no other’, and was therefore
incurred in the production of income.
Warner Lambert v CIR
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