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How does GST on PayPal payments work for Australian Taxation?
Regardless of wether or not you are registered for GST, you are legally required to include a GST total on every invoice sent to an Australian customer. This GST total must be 10% of the payment amount if you are registered for GST, or it must be $0.00 if you are not registered for GST. Since all GST transactions with the government are in Australian dollars, this amount on the invoice also needs to be in AUD, or else it's impossible for you and your customer to both be working off the same GST amount. This means you need to transfer your money from USD to AUD in PayPal's "Manage Currencies" area before you can send a tax invoice to the customer, so that you can provide the correct amount in AUD based on the actual exchange rate for the day (and you are required to send invoices promptly). Alternatively, you can collect payments in AUD using PayPal or use a different payment service that collects payments in USD but immediately converts them to AUD for sending an invoice (australian paypal competitors often provide this service).