Based on what you have started it is very likely you would be caught by the Personal Services Legislation (PSI) legislation.
This means you would be required to remit tax no 75% of the income earned on a quarterly basis at your personal marginal tax rate not the corporate rate.
You may also find that you are entitled to less deductions than you would as a salary and wage earner.
The PSI legislation was designed to prevent exactly what you are proposing.
If your circumstances do allow you to get around the PSI legislation there are still ATO rulings in relation to personal exertion businesses. The previous poster is also correct in that that if PSI legislation does not apply after the first year if your tax liability is greater than $8,000 you will need to pay PAYG on a 1/4 basis any way.
