With personal income tax, say you have a low paying fulltime job (like 30k) but you make one trade with your savings and make a profit of say, 10k, do you pay tax on the share trade as a second income or do you just add the 10k and 30k together, find your tax braket and then figure out how much tax you owe from there? Does it matter if you make 1 or 1000 trades a year on how your tax is treated? (I'm talking from being classified by the ato as an investor and not a trader).