how to minimise tax on share trades

Dear All,

I got a Qs for you all....


When we buy / sell shares, on profits we get the BEFORE TAX AMOUNT into our Bank Accounts.


My Qs is, if say the HIN does not have a TAX file Number provided, how will the ATO know you are liable for any Cap Gain tax?

Secondly, you will obviously be paying a higher tax on dividends (as you have not quoted your TFN), having said that, the profit on capital gain MORE than outweighs the dvidend amount.


Eg. say I do a trade on a stock, it pays no divdend and I have made $10,000 PROFIT within 7 months.

I have not quoted my TFN

How will the ATO know of this 10,000 profit? (one of many profits)