That depends largely on the amount of the investment income, in relation to the total income. If the investment income is a small amount compared to the total income, then it will difficult to argue for it. For example, if employment income is about $100,000 and investment income is about $70, then it will be difficult to deduct the accounting fees against the investment income.
This is because accounting fees are only a deduction for investment or self-employment income, and not for employment income. And if employment income is the predominant source of your income, then it would be difficult to argue towards getting the deduction.
