Australia GST Calculator
Australia taxes most goods, services and other items sold or consumed with a Goods and Services Tax at a flat 10%, administered by the Australian Taxation Office (ATO). GST-registered businesses must add 10% GST to their prices and remit it, while claiming credits for GST paid on business purchases.
How to use this Australia GST calculator
- 1
Choose "Add tax" (base price → GST-inclusive) or "Remove tax" (inclusive → net).
- 2
Enter the amount in AUD.
- 3
The 10% rate is pre-selected — results update as you type.
Australian GST formula
Extracting GST from an inclusive price: Net = Gross ÷ 1.1, GST = Gross − Net. The division by 11 shortcut (GST = Gross total ÷ 11) comes from the same identity — exactly what "Remove tax" computes.
Australian GST at a glance
| Standard — 10% | Most goods, services and items sold in Australia |
| GST-free — 0% | Basic food, some medical services, exports, education |
| Input-taxed | Financial supplies, residential rent (no GST, no credits) |
Australia GST FAQ
How do I calculate GST from a GST-inclusive price?
Divide the total by 11 — that is the GST amount; the remainder is the base price. Equivalently, Net = Total ÷ 1.1. The "Remove tax" mode above does this in AUD instantly.
Is everything in Australia taxed at 10% GST?
Most things are, but basic foods, exports, some medical and education services are GST-free (0%), and financial supplies and residential rent are input-taxed. Use the custom-rate field for anything outside the flat 10%.
When must a business register for GST in Australia?
Once turnover reaches the ATO threshold (currently $75,000 for businesses, $150,000 for not-for-profits) registration is mandatory; it is optional below that. Registrations are done through the ABR.
What is BAS and how does GST relate to it?
The Business Activity Statement (BAS) reports your collected GST minus your GST credits each period. This calculator gives the per-invoice numbers you would aggregate on one.
How much GST on A$1,000?
Adding 10%: GST = A$100.00, gross A$1,100.00. From an A$1,000 GST-inclusive total: GST = 1,000 ÷ 11 = A$90.91 and net = A$909.09. Toggle the Add/Remove mode to flip between the two directions.
Why divide by 11 to remove Australian GST?
Because GST is 10% of the base, an inclusive amount equals 11 tenths of the base. So GST = Gross ÷ 11 and Net = Gross × 10 ÷ 11. Example: A$550 inclusive = A$50.00 GST + A$500.00 net — the ATO’s famous "divide by eleven" check.
How do I add 10% GST to a price?
Multiply by 1.1: a A$500 price becomes A$550.00 with GST of A$50.00 shown separately on the invoice. On a basic calculator: price × 10 ÷ 100, added back on top.
Is there GST on wages or salaries in Australia?
No — employment income is outside the GST system; PAYG withholding tax covers it. GST applies only to taxable supplies of goods, services and anything else connected with Australia in the course of an enterprise.
Do imported goods attract GST in Australia?
Yes — since 1 July 2018 the GST applies to low-value imported goods (≤A$1,000) sold to Australian consumers by offshore vendors registered with the ATO under the relevant simplification rules; customs levies GST at the border above that value.
When is a BAS actually due?
Quarterly BAS is due 28 October, 28 February, 28 April and 28 July for standard periods; monthly lodgers get 21 days after each month (earlier electronically for some). The GST section is exactly where your collected minus credited amounts land.
Can I use the calculator for the 2000-era 12.5% or other old rates?
Yes — the custom-rate field accepts any rate, so old contracts, settled documents or foreign transactions at non-standard rates reverse correctly. The formula Base = Amount × 100 ÷ (100 + rate) is rate-agnostic.
Does Australian GST apply to digital products and services?
Yes — streaming, software, apps, games and consultancy delivered to Australian consumers by offshore sellers fall under the e-commerce measures since 2016, with the vendor required to register and charge 10% GST on consumer sales.
About this Australian GST calculator
Australian GST is a flat 10% on most goods, services and items sold in Australia, so the maths is famous for two shortcuts: multiply by 11 to go from a GST-inclusive figure to the GST it contains (the "divide by 11" rule), and multiply by 1.1 to add GST to a base price. This Australian GST calculator does both directions with exact arithmetic — no float drift on cents — which matters because the ATO expects BAS figures to add up on the dollar.
Businesses use it to build quotes and invoices, to extract the GST inside receipts before claiming credits, and to sanity-check turnover against the $75,000 registration threshold. Consumers use it to see the tax inside an advertised price. Free, no signup, works offline after the first load, and keeps your amounts entirely in your browser.
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