Free GST Calculator
for Australia
Calculate GST instantly on any amount. Add or remove the standard Australian 10% GST.
A free online tool for freelancers and small businesses.
Formula: GST = Amount × 0.10, Total = Amount × 1.10
How Does GST Work in Australia?
Everything you need to know about GST (Goods and Services Tax)
What is GST?
GST is a 10% tax applied to most goods and services. If you run a business in Australia, you need to charge this tax and remit it to the Australian Taxation Office (ATO).
Extracting GST from GST-Inclusive Prices
To calculate the GST amount from the total price, divide by 11.
Example: $110 ÷ 11 = $10 (GST)
Adding GST to GST-Exclusive Prices
To add GST to the base amount, multiply by 10% or multiply by 1.1.
Total = Amount × 1.10
Example: $100 × 1.10 = $110 (Total)
GST Registration Threshold
If your annual turnover is $75,000 or more, GST registration is mandatory. If your turnover is below this threshold, you can voluntarily register and claim GST credits on business expenses.
Tax Invoice Requirements
GST-registered businesses must include the following on Tax Invoices:
- ✓The words "Tax Invoice"
- ✓Seller's ABN (Australian Business Number)
- ✓Seller's business name
- ✓Issue date
- ✓Description of goods/services
- ✓GST amount
- ✓Total amount
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