Tax Invoices for online orders

Please understand we are end users like you, not Apple employees. We provide pro bono tech support, not financial consults because we have neither access to Apple's records nor any internal accounting policies.

You should first inquire at a local Apple-owned store if one is open. If not, try Apple's offices in Sydney:

I am not familiar with Australian (tax) laws; however, if you purchase something, does your receipt not show the tax paid? It does in the US (price of item + tax amount = total).