do apple australia give ABN discount

Please understand that theres forums are not staffed by Apple but by end users like you. We are here to give tech assists within our experience base but not business information. I believe your best place to go for business answers is Apple Australia. Their contact information is on this web page:

How to Contact Us - Apple (AU)

This may be helpful for you in regards to your question about a discount in Australia.

https://www.finder.com.au/apple-store