ddzx has it all covered. The easiest way to prove your trading intentions is to write a small business plan for each account stating your intentions. Just because you have a longer term investment account doesn't mean you can't buy and sell within shorter time frames however if you constantly trade in and out, a ruling maybe made that this is in fact a trading account. There is no hard and fast rules as to how the ATO can apply this judgement and many accountant also have slightly varying interpretations. If you decide that a short term trade infact becomes a longer term hold then you can transfer it across to the other account and the 12 months starts from then for CGT discount.
