Loading
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.
Price including GST
Adding GST to $1,100.00 makes $1,210.00, and $110.00 of that is GST.
GST component: $110.00. GST has been added to the amount below.
For a fully taxable sale only. The GST inside a GST-inclusive price is one-eleventh of it: divide by 11, then subtract that GST to find the price before GST.
Your amount is the price before GST. We add 10%.
The GST rate in Australia is a flat 10% on most goods and services.
Adding GST multiplies the price by 1.1, so the GST is one-eleventh of the new total.
For a fully taxable sale priced at $1,000.00 before GST, this calculator adds $100.00 of GST.
The total including GST is $1,100.00.
Enter that $1,100.00 total in Remove GST mode. Dividing by 11 gives a GST component of $100.00.
Subtracting the GST gives $1,000.00 before GST. GST credits depend on the purchase and eligibility, not this arithmetic alone.
If you report GST quarterly, your business activity statement (BAS) is due on the 28th of the month after the quarter ends. The exception is 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.
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.
Goods and services tax is 10% on most goods and services sold or consumed in Australia. This calculator adds GST or separates it from a fully taxable GST-inclusive price.
Registered businesses report GST collected on taxable sales and eligible GST credits on their business activity statement (BAS). The difference is the amount payable or refundable.
For a taxable sale, GST is 10% of the price before GST. Multiply that price by 1.1 to add GST. This calculator shows the price before GST, the GST component and the total including GST.
For a price that includes GST on a fully taxable sale, divide the total by 11 to find the GST component, then subtract that component to find the price before GST. The one-eleventh rule does not apply to the whole total if it includes GST-free or input-taxed items.
GST is 10% on most goods, services and other items sold or consumed in Australia. GST-free and input-taxed sales are treated differently.
Businesses generally must register when GST turnover reaches $75,000 or more, or $150,000 for non-profit bodies. The ATO tests current and projected turnover over 12-month periods; GST turnover is not profit. If current turnover reaches the threshold, registration may still not be required if the ATO is satisfied that projected turnover will be below it. Taxi and limousine passenger travel, including ride-sourcing, requires registration regardless of turnover. Registration is also required to claim fuel tax credits. Otherwise, registration can be voluntary below the threshold.
Neither type has GST added to the sale price. For GST-free sales, such as most basic food, a registered business can generally claim GST credits for related purchases. For input-taxed sales, such as residential rent, it generally cannot claim credits for related purchases. Exceptions and mixed supplies need separate treatment.
Consumer prices generally include GST where it applies. Business quotes may state a price excluding GST, so check whether the amount is GST-inclusive or GST-exclusive before choosing a mode. GST-free and input-taxed items have no GST to remove.
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.