Australia GST
Australian GST tools
Use this focused GST section to add GST to a net price, extract GST from a GST-inclusive total, and prepare a transparent tax invoice.
Coverage is deliberately limited to GST arithmetic and invoice workflow. It does not calculate income tax, payroll, superannuation, eligibility for credits, registration liability, or a complete and accurate BAS.
GST Calculator Australia
Add or extract Australian GST from a base or total amount.
Australia invoice GST workflow
Move cleanly from subtotal to GST line to final total.
GST vs BAS workflow limits
See where the live calculator stops and BAS complexity starts.
Methodology
How tax calculations are checked before release.
How GST works in Australia
GST (Goods and Services Tax) is a flat 10% tax on most goods and services sold in Australia. Businesses registered for GST add it to their prices, collect it from customers, and remit it to the Australian Taxation Office, while claiming credits for the GST they pay on their own business purchases.
You must register for GST once your annual turnover reaches the registration threshold, and registration is compulsory sooner for some activities such as taxi and ride-share driving. Once registered, a tax invoice for a sale over the set amount must show your ABN, the words 'Tax invoice', and the GST included.
Adding, removing, and reporting GST
Because GST is a flat 10%, adding it means multiplying the net price by 1.1. Removing it from a GST-inclusive total means dividing by 11 to find the GST portion — a shortcut that works precisely because the rate is exactly one-eleventh of the gross price.
Registered businesses report GST to the ATO on a Business Activity Statement (BAS), usually quarterly. The GST calculator and the invoice-GST and BAS workflow pages show where a simple GST calculation ends and full BAS reporting begins.
Where a simple GST calculation stops
Multiplying by 10% cannot decide whether a sale is taxable, GST-free, input-taxed, or outside Australia's GST system. It also cannot determine whether you must register, whether a purchase carries an input tax credit, or how an adjustment belongs in a BAS period. Those questions depend on the transaction and the ATO rules, not only the amount entered.
Use the calculator after the GST treatment is known. Check ATO guidance for exports, imported services and digital products, property, financial supplies, second-hand goods, mixed supplies, and sales made before or after registration. Retain the supplier invoice and the reason for the chosen treatment; a correct one-eleventh calculation does not make an ineligible credit claim valid.
Frequently asked questions
What is the GST rate in Australia?
A flat 10% on most goods and services. Some items, such as basic food and certain health and education services, are GST-free.
How do I find the GST inside a total?
Divide the GST-inclusive total by 11. Because GST is 10%, the tax portion is exactly one-eleventh of the gross price.
When must I register for GST?
Once your annual turnover reaches the ATO registration threshold, or immediately for some activities like ride-share driving. Below the threshold, registration is optional.
Is superannuation part of GST?
No. GST is a sales tax on goods and services. Superannuation is a separate compulsory retirement contribution and is not covered by these GST tools.