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GST Calculator Australia

Add or extract 10% GST from any amount, with a quarterly BAS estimate (GST on sales less input credits) and a check against the $75,000 registration threshold.

✅ Figures verified. 10% GST, the $75,000 registration threshold ($150,000 for non-profits), GST-free and input-taxed categories and BAS reporting are ATO rules confirmed on 10 October 2026.
$0
GST-exclusive amount—
GST (10%)—
GST-inclusive amount—
Quick method—
BAS: GST on sales (1A)—
BAS: GST on purchases (1B)—
BAS: net GST payable / refund—
Registration check—

In short

Australian GST is 10%: multiply a GST-exclusive price by 1.1 to add it, or divide a GST-inclusive price by 11 to find the GST inside. Businesses must register once turnover reaches $75,000 ($150,000 for non-profits; immediately for ride-share drivers) and report GST collected less input credits on a BAS, usually quarterly. Basic food, health, education and exports are GST-free; residential rent and financial supplies are input-taxed.

Who this is for: Australian consumers, tradies and small businesses working out GST and BAS.

Not tax or legal advice. General information; BAS obligations, special rules (margin scheme, LCT, WET, imports) and state taxes are not covered. Not tax advice.
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GST in Australia

  • Rate: 10%. To add GST multiply by 1.1; to find the GST in a price divide by 11; to strip it divide by 1.1.
  • Registration: compulsory once GST turnover reaches $75,000 a year ($150,000 for non-profits), or from day one for taxi, limousine and rideshare drivers; optional below that.
  • BAS: report GST collected (1A) and GST paid on business purchases (1B); the difference is paid or refunded. Quarterly BAS is due 28 October, 28 February, 28 April and 28 July (later via a BAS agent).
  • GST-free vs input-taxed: both charge no GST, but only GST-free suppliers can claim credits on their inputs.
  • Pricing: consumer prices must be shown GST-inclusive; business-to-business quotes are often ex-GST — always check which.

See also: Australian Income Tax Calculator 2026–27, Break-Even Calculator.

Sources: ATO — GST; ATO — Registering for GST. Checked 10 October 2026.

Assumptions

  • GST = exclusive × 10%; inclusive ÷ 11.
  • BAS: 1A = sales ÷ 11, 1B = purchases ÷ 11 (all taxable supplies).
  • Registration compulsory at $75,000 of GST turnover.

Worked example

$1,500 GST-exclusive invoice; business with $66,000 of quarterly sales and $22,000 of purchases, $240,000 annual turnover

GST on $1,500 is $150, so the invoice total is $1,650 (and $1,650 ÷ 11 = $150 recovers it). BAS: GST on sales $66,000 ÷ 11 = $6,000; input credits $22,000 ÷ 11 = $2,000; net $4,000 payable for the quarter. Turnover of $240,000 is well above $75,000, so registration is compulsory.

Frequently asked questions

How do I calculate GST on a price?

Add 10% (× 1.1) to a GST-exclusive price; to find the GST inside a GST-inclusive price divide by 11.

When do I have to register for GST?

When your GST turnover reaches $75,000 in a 12-month period (or you expect it to), within 21 days — $150,000 for non-profits, and immediately for ride-share and taxi drivers.

What is GST-free?

Most basic food, medical and health services, education courses, childcare, exports and some precious metals — no GST is charged but the supplier can still claim input credits.

How often do I lodge a BAS?

Quarterly for most small businesses (monthly if turnover is over $20 million or by choice; annually if voluntarily registered under $75,000).

Do I charge GST to overseas customers?

Exports of goods and most services to non-residents are GST-free, but you can still claim credits on related purchases.

What is the GST on a car?

10% — but input credits are capped at one-eleventh of the car limit ($69,883 in 2026–27, so a maximum credit of $6,353); luxury car tax of 33% applies above the LCT threshold ($80,809, or $91,661 for fuel-efficient cars) on top.

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Written by the Swift IT Sols editorial team · SWIFT SOLSRules sourced from the official authorities named on this page and last checked How we source and check calculators

Found an error? Report it — tell us the inputs, the result you got, what you expected and the rule or source. Confirmed corrections are published within a week.

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