high volume turnover trader tax question, page-18

am not an expert on GST issues, but you certainly can set up a company structure (or Trust structure) and run your trading business thru that.
The ATO would have no trouble with that providing it is a real business, that you keep proper records (and separate records) and pay GST etc etc.
The ATO supposedly can only jump on you if you "EVADE" tax, or if it is a device to simply "avoid" tax.
You would definately be able to justify a company structure to the ATO for all sorts of reasons - eg simplicity, separation of business, legal and liability advantages etc.

There are PLENTY of good accountants & lawyers around who do this stuff every day.
cheers