GST Calculator AU
The Australian GST Calculator helps you calculate 10% GST on GST-exclusive and GST-inclusive amounts. Use it for basic GST arithmetic when the GST treatment of the transaction is already known.
Australia GST Calculator
Australian GST formulas
Add 10% GST
GST = GST-exclusive amount × 10%
Total including GST = GST-exclusive amount × 1.10
Example: $100 before GST → $10 GST → $110 including GST.
Remove GST from a GST-inclusive price
GST-exclusive amount = GST-inclusive amount ÷ 1.10
Example: $110 including GST → $100 before GST and $10 GST.
Find the GST component of an inclusive price
GST component = GST-inclusive amount × 10 ÷ 110
Example: $220 including GST × 10 ÷ 110 = $20 GST.
What this calculator does
- Add 10% GST to an exclusive amount
- Remove GST from an inclusive amount
- Find the GST component of an inclusive amount
- Show the GST-exclusive amount and total
Important: This calculator performs standard GST arithmetic. It does not determine whether a transaction is taxable, GST-free or input-taxed, whether you must register for GST, or how much GST you should report on a BAS. Those questions depend on the transaction and current Australian tax rules.
GST in Australia
Australia’s standard GST rate is 10% for taxable supplies. GST treatment can vary for different goods, services and circumstances, so the calculator should be used only after the applicable GST treatment is known.
Official Australian GST guidance
For current GST rules, registration requirements, GST-free and input-taxed treatment, BAS obligations and other tax matters, refer to the Australian Taxation Office (ATO) GST guidance.
Frequently asked questions
What is the GST rate in Australia?
The standard GST rate in Australia is 10%.
How do I remove GST from an Australian price?
Divide the GST-inclusive price by 1.10 to find the GST-exclusive amount.
How do I find the GST amount in an inclusive price?
Multiply the GST-inclusive amount by 10 ÷ 110.
This calculator provides standard GST arithmetic only. For current Australian GST rules and obligations, check the ATO or obtain professional tax advice where appropriate.
More Australian GST tools
Use the Australia GST Registration Threshold Calculator to screen the standard A$75,000 threshold, or the Australia BAS GST Calculator for a basic arithmetic estimate of GST on entered taxable sales and business purchases.
