yea so as
kroiston and others have said...
if you want to be a bookkeeper or admin/accountant etc type role: tafe should do it.
otherwise, if you want to be an actual accountant, regardless of the type - be it tax, forensic, audit, general etc - then you need a bachelor's degree.
traditionally, it should be something like B Business/Economics/Commerce/Actuarial - which normally for USYD/UNSW, it's around a 94-95 ATAR from the last time I checked. UTS is around lower 90s and not sure about the other uni's. You major normally in accounting and if possible, a 2nd major as well, then you graduate, and before you do you should get some prof. office experience - getting an internship with an accounting firm etc would be good and can guarantee you a graduate offer. Ultimately, you graduate and you work as an accountant in a firm - to be further specialised/increase your salary in the mid-term etc, it would be advisable to apply for and study to be a Chartered Accountant either via the CPA or CA normally whilst you're working. Your choice really.
Or otherwise of course, you can do a non-traditional degree if you have a strong interest in studying something other than accounting, and still apply for internships during uni for accounting firms, as some firms tend to open up to those who are not studying business degrees I believe?
that's the general gist of it.
and the best way to find out if you really are interested in being an accountant would be to get some real job experience working in the accounting field. and also, doing the intro courses to accounting which are normally compulsary for business degrees at uni - or of course, doing accounting as a course if it's offered, for your hsc.
ps. i don't want to be an accountant (any more)
but good luck to you!