Do I need to register for GST in Australia?

Three things worth knowing first

• GST is Australia's 10% tax on most goods and services, and it works on self-assessment. The tax office doesn't send reminders — sellers are expected to know when the rules begin to apply to them. Registration is made under an ABN (an Australian Business Number — no local company or address is needed), and registering is also what allows you to claim GST back, including the GST paid at the border when you import your own stock.
• Storing stock in Australia changes your position. Marketplaces only remit GST on low-value parcels shipped from overseas. Once your goods sit in an Australian warehouse — Amazon FBA or a third-party facility — each local sale is treated as your own, and reporting it becomes your responsibility rather than the platform's.
• The A$75,000 threshold counts Australian sales only, and it looks ahead as well as back. A shipment of stock and a genuine sales plan can mean registration falls due before your first sale, with 21 days to apply. If registration happens late, the ATO can backdate it — which can mean paying GST on past sales that was never collected from customers, while GST paid at the border in the meantime goes unclaimed.

With that context, the check below takes about two minutes: