Australia GST Calculator

Add GST to a price, or work out the GST already included — at Australia's standard 10% rate.

  • Free, updates instantly as you type
  • Defaults to 10%, or set a custom rate
A$0 total (GST included)
Base amount
A$0
GST amount
A$0

Australia's standard GST rate has been 10% since it was introduced — but some goods and services are GST-free or input-taxed. Check the ATO if you're unsure whether GST applies to what you're calculating.

Frequently asked questions

What is Australia's GST rate?

10%, applied to most goods and services sold in Australia. Some categories — like basic food, health, and education — are GST-free.

How do I remove GST from a total price?

Switch to "Remove GST" and enter the GST-inclusive total. The calculator divides by 1.1 (for the standard 10% rate) to find the base amount.

Is every business required to charge GST?

Generally only businesses registered for GST (mandatory once turnover passes a threshold) charge and remit it. This calculator just does the arithmetic — it doesn't determine whether GST should apply to your situation.

How GST is added and removed

Australia's GST is a flat 10% of the price before tax. To add GST, multiply by 1.10. To remove it, divide the GST-inclusive price by 1.10. The GST contained in any inclusive price is exactly one eleventh of it.

A worked example

An item costs A$100 before GST. GST is A$10 and the price including GST is A$110. From an inclusive price of A$110, A$110 ÷ 1.10 = A$100, so the GST is A$10, which is 110 ÷ 11.

A common mistake: taking 10% off A$110 gives A$99, which is wrong. Always divide by 1.10 (or take one eleventh of the total to find the GST).

GST-free and input-taxed

Not everything carries GST, and the two exceptions behave differently:

  • GST-free supplies (such as certain basic foods, health and education services) have no GST charged, but the seller can still claim back GST on their costs.
  • Input-taxed supplies (such as financial supplies and residential rent) also have no GST charged, but the seller generally can't claim back GST on related costs.

The Australian Taxation Office (ATO) decides which category a particular product or service falls into. If you're unsure, check the ATO's guidance before pricing or invoicing.

Good to know

  • The rate here is editable, so you can use the calculator for other flat-rate taxes too.
  • This is an aid for estimating prices and checking invoices, not tax advice.

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