You will need to register for GST if you’re n• an Australian business with an annual turnover of $75,000 or moren• a not-for-profit organisation with an annual turnover of $150,000 or moren• an international business/retailer with an annual total Australian sale of $75,000 or moren• a taxi driver or ride-sharing driver (Uber, Ola, Di Di, GoCatch) regardless of how much you earnn• a business that wants to claim fuel tax credits