"Where the case concerns the payment of legal expenses, the proper characterisation of the expenditure for tax purposes turns on a consideration of the circumstances with which the legal proceedings were concerned … In my judgment, the objective purpose of defending the … charges … was to protect the respondent from the consequences specified under s 62(6) of the [PSA], or to diminish their severity. The purpose was, therefore, to seek to protect the respondent's recurrent employment income from diminution or loss, or other adverse impact … In my opinion, expenses incurred in the defence of employment from that which threatens to destroy or diminish its income earning satisfies the positive test for deductibility. … The object in view in respect of the incurring of legal expenses in relation to the … charge[s] was to resist direct threats to the diminishing of, or the destruction of, the income-earning ability of the taxpayer. The situation which impelled the taxpayer to undertake the outlaying of those expenses was the fact that he had been charged under the [PSA] and the consequence of those charges being successful would be that his income would be diminished or lost. It is quite irrelevant whether the content of the charges related to activities of his employment, or were extraneous to the proper discharge of his duties. There would be no difference if a public servant was charged with being rude to customers in answering complaints, which is conduct engaged in by the public servant in the course of his or her duties, or a charge that he or she had downloaded child pornography from his or her office computer, conduct which is extraneous to the discharge of his or her duties as a public servant. The consequence of either charge being sustained is that the public servant's income might be diminished or lost. The legal expenses in defending either charge fall within the test set out by Dixon J in [Hallstroms Pty Ltd v Federal Commissioner of Taxation][150] … [and] by Drummond J in Federal Commissioner of Taxation v Rowe[151] … Drummond J said that [such] expenses had the requisite nexus because 'they were incurred to preserve his entitlement to receive in return for his services, assessable income'."