I made a research and found this. It seems that income acquired through marketplaces is exempt from GST threshold. So my sales won't be taxed at 10%. But this makes it even more weirder, because Xbox store (or whatever it is called) is also an online marketplace. So what do they need the GST for?
As an independent seller, you must register for GST if your digital sales in surpass Australia’s annual threshold of A$75,000. If you don’t pass the limit, then you don’t need to register.
But — and this is an important “but” — if you use an online marketplace to sell your products, then it’s likely the marketplace operator is responsible for GST… not you! And it’s possible you don’t need to register for taxes after all.
Electronic Distribution Platforms (EDP) and Australian GST
According to the ATO, an electronic distribution platform “includes (but is not limited to) a website, internet portal, gateway, store or marketplace.” So this could be anything from Amazon to the Apple App Store
Any sales made through an EDP
- Do not count toward your annual sales threshold
- Are not your GST responsibility!
Instead the operator of the EDP is liable for these taxes, and it’s their responsibility to inform the customer, charge, collect, and pay GST.
Source: quaderno io