Skip to main content

GST calculator

How to calculate Australian goods and services tax

Page reading time: 1 minutes

This calculator explains:


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.

This calculator can help when you're making taxable sales only (that is, a sale that has 10 per cent GST in the price).

To work out the cost including GST, you multiply the amount exclusive of GST by 1.1.

You divide a GST inclusive cost by 11 to work out the GST component.

A taxable sale must be:

  • for payment of some kind
  • made in the course of operating your business
  • connected with Australia.

The Australian Taxation Office website explains in more detail how the goods and services tax (GST) works.