Better safe than sorry, in Australia we can capitalise on our losses so we won't pay tax or income tax for that matter on the amount we have invested. If lets say I invested $50,000 and then took out $50,000 anything over $10,000 to the dollar is reported to AUSTRAC it's all about protection and anti-money laundering, the banks report everything and the taxation office knows all so there isn't any easy way to escape it.

Keep records as you can use this as your evidence, proof as such - otherwise you risk paying capital gains on your profits.