Copying an email I received, couldn't find anything online.
Important: “Netflix tax” effective 1 July 2017
From 1 July 2017, Goods and Services Tax (GST) will apply to fees on eBay.com.au, due to new legislation in Australia (the "Netflix Tax").Businesses registered for GST will not be affected by this change if you register your Australian Business Number (ABN) with eBay here.
More information on this new legislation can be found here.
Regards,
The eBay Team"
http://mail.ebay.com.au/r/mail/11c42II3fcb4eII1b8f1b583f4II2
It'll be like 25%, well I round it to that amount(as a buffer). So if you sold an item for $100, be prepare to give at least $25 to fees….and that's not including postage and handling if it needs to be posted…