Hash my understanding is that you just add your capital gain to...

Hash my understanding is that you just add your capital gain to your other accessible income. If you qualify for the capital gain discount, i.e. held the stock for 12 months or more, then you only add 50% of the capital gain to your accessible income. So the worst case for you 1M guys is that if your other accessible income is $180k and you sell 4DS after holding the stock for 12 months or more, then you would have to pay about 22.5% of the capital gain as tax, i.e.half the >$180k marginal rate of 45%. Just a rough estimate that depends on your other income, and I could be wrong of course. It's been a while since I paid any tax. Most of my income is generated within supper accounts that are in the pension phase, i.e. zero tax on earnings.

The Investor (Capital Gains) and Trader tax is whole other issue. Back when I was working I was defined as both by the ATO. I rang the ATO and asked for advice re my classification but after being transferred about 4 or 5 times they eventually told me that they made a decisions on a case by case basis, i.e. they didn't know. I saw an accountant and he wrote them a letter asking for a decision. I ended up with an Investment Portfolio and a Trading Portfolio. All very confusing. Things are much simpler now thanks to retirement and my hero Peter Costello.

Hope this helps.