A New Tax System (Goods and Services Tax) Act 1999
Note:Division 162 - Payment of GST by instalments 162-1 What this Division is about
You may be able to elect to pay GST by instalments. If you do, GST returns are given to the Commissioner annually, and quarterly instalments of GST are paid on the basis of the Commissioner's or your estimates of what your annual GST liability will be (followed by a reconciliation based on the annual GST return).
If you can average your income for income tax purposes, you only pay the last 2 quarterly instalments.
In some cases, you will only pay the last 2 quarterly instalments: see section 162-105 .