I feel like I should be pulling out a lil ID card with my creds on it 😆
For whatever it's worth, selling on eBay since 2009, store since 2011, GST-registered since 2018.
Your question is actually kinda wrong to begin with, because ebay do not collect any GST on a seller's behalf. They collect GST from sellers, because they are selling us a digital service and that attracts GST, but they don't collect GST for sellers, which I note a couple other members have since clarified, in that you alone are responsible for including GST in your pricing and handing it over to the ATO when you do your BAS.
If you supply them with your ABN, they will not apply GST to your fees, anyway, since if they did, it would just be a claimable credit and not affect the total you owe to the ATO every quarter. (Postage label costs are not fees, even though they are deducted from sale totals like fees, so they will always include a GST component).
On that note, don't buy postage on eBay, if you sell in enough volume to be GST-registered, you'll be much better off purchasing your labels directly from AP via My Post, or eparcel, and the tax invoices from AP make things easier.
