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Add 10% GST to a price, or reverse the GST out of a total that already includes it. To add GST, multiply the price by 1.1. To find the GST already in a price, divide it by 11.
Your amount is the price before GST — we add 10%.
The GST rate in Australia is a flat 10% on most goods and services.
Total price (incl. GST)
$1,210.00
Includes $110.00 of GST.
Adding GST multiplies the price by 1.1 — the GST is one-eleventh of the new total.
You quote a job at $1,200 before GST. Multiply by 1.1: $1,200 × 1.1 = $1,320.
The GST to send to the ATO is $1,200 × 10% = $120, and the invoice total is $1,320.
A receipt shows $99 including GST. Divide by 11: $99 ÷ 11 = $9.
The GST you can claim is $9.00 and the price before GST is $90.00.
If you report GST quarterly, your business activity statement (BAS) is due on the 28th of the month after the quarter ends — except the December quarter, which is extended to 28 February. How you lodge then changes the deadline again, and a date landing on a weekend or a public holiday moves to the next business day. These are the real dates for 2026-27.
| Quarter | Period | Paper | Online | Through an agent |
|---|---|---|---|---|
| Q1 | July – September | 28 October 2026 | 11 November 2026 | 25 November 2026 |
| Q2 | October – December | 2 March 2027 | 2 March 2027 | 2 March 2027 |
| Q3 | January – March | 28 April 2027 | 12 May 2027 | 26 May 2027 |
| Q4 | April – June | 28 July 2027 | 11 August 2027 | 25 August 2027 |
The December quarter is the exception: its 28 February date already carries an extra month, so lodging online or through an agent buys no further time and all three columns match.
Q2 moves from Sunday 28 February 2027 to Tuesday 2 March 2027. A due date falling on a weekend or a state-wide public holiday is deferred to the next business day, and Labour Day is in the way.
GST is a flat 10% tax on most goods and services. To add GST to a GST-exclusive price, multiply it by 1.1 (or add 10%). To work out how much GST is already inside a GST-inclusive price, divide the total by 11 — the GST is always one-eleventh of a price that includes it, not 10% of it. That difference trips people up: 10% of $110 is $11, but the GST inside a $110 total is $10.
Switch the toggle to Remove GST to run it backwards. Enter a price that already includes GST — a supplier invoice or a till receipt — and it returns the GST component and the price before GST. This is what you need when you are claiming GST credits on a purchase or splitting an expense for your BAS.
You must register for GST once your business's GST turnover reaches $75,000 or more in a 12-month period (current or projected). The threshold is $150,000 for not-for-profit bodies, and taxi, ride-source and limousine drivers must register from their first dollar. Below the threshold, registering is optional — but once registered you must charge GST and lodge a BAS. Sole traders and contractors work out this turnover on their ABN income — see the sole trader tax calculator for the income tax side.
The GST rate, registration threshold and BAS due dates are the ATO's published figures. Confirm your obligations with the ATO or your registered tax or BAS agent.
This calculator is not intended to be relied on for the purposes of making a decision in relation to a financial product. Before you make a financial decision, consider obtaining advice from someone who holds an Australian Financial Services Licence. We do not, and we cannot advise you.
The goods and services tax (GST) is a flat 10% tax on most goods, services and other items sold or consumed in Australia. It has applied since 1 July 2000 and the 10% rate has never changed.
Businesses registered for GST add 10% to their taxable sales, claim back the GST on their purchases (GST credits) and pay the net amount to the ATO through their business activity statement (BAS).
Some things are GST-free (most basic food, health, education and exports) and some are input-taxed (residential rent and most financial supplies), so no GST is charged on them.
To add GST, multiply the GST-exclusive price by 1.1 (that adds 10%). For example, $200 × 1.1 = $220, so the GST is $20. To find the GST already included in a price, divide the total by 11 — for example, $220 ÷ 11 = $20.
Divide the GST-inclusive price by 11. The GST is always one-eleventh of a price that includes it, so a $110 total contains $10 of GST and $100 before GST. Switch this calculator to Remove GST to do it automatically.
GST is a flat 10% on most goods and services. It has been 10% since GST started on 1 July 2000 and applies the same way across every state and territory.
You must register once your GST turnover reaches $75,000 or more in a 12-month period ($150,000 for not-for-profit organisations). Taxi, ride-source and limousine drivers must register regardless of turnover. Below the threshold, registration is optional.
Most basic food — bread, milk, fruit, vegetables, meat — is GST-free. GST does apply to prepared and restaurant meals, takeaway, confectionery, snack foods and soft drinks, so a supermarket receipt can be a mix of both.
Exports of goods and services from Australia are generally GST-free, provided the goods are exported within 60 days of the earlier of receiving payment or issuing an invoice. You still report the sale on your BAS, just with no GST.
No. Residential rent is input-taxed, so landlords do not charge GST on the rent and cannot claim GST credits on related costs. Commercial property rent is different — it is a taxable supply and does include GST.
Estimates only. Not financial or tax advice. Full disclaimer for your rights and our limitations of liability.
This calculator exists to show you the arithmetic. It applies published Australian rates, thresholds and formulas to the numbers you enter and shows the working, so you can check it. That is all it does — it produces a number and describes what the number is. It does not recommend anything and it holds no opinion about any financial product.
What can move this result
This calculator is not intended to be relied on for the purposes of making a decision in relation to a financial product. Before you make a financial decision, consider obtaining advice from someone who holds an Australian Financial Services Licence. We do not, and we cannot advise you.