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GST calculations

GST and rebates
How GST applies to rebates you pay and receive and other trade incentive payments that are common in manufacturing, wholesaling and retailing.
This interactive GST calculation worksheet allows you to work out GST amounts for your business activity statement (BAS).
Quarterly GST reporting
If your GST turnover is less than $20 million and we haven't told you that you must report GST monthly, you can report and pay GST quarterly using one of three reporting methods.
When to charge GST (and when not to)
If you are registered for GST - or required to be - the goods and services you sell in Australia are generally taxable unless they are 'GST-free' or 'input taxed'.