How do I calculate GST?

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.

How do I work out the GST included in a price?

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.

What is the GST rate in Australia?

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.

When do I have to register for GST?

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.

Is there GST on food?

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.

Is there GST on exports?

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.

Is there GST on residential rent?

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.

Australian GST rate: 10%

GST Calculator

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.

Amount

Enter a price and choose whether to add or remove GST.

What do you want to do?

Your amount is the price before GST — we add 10%.

Price before GST ($)

The GST rate in Australia is a flat 10% on most goods and services.

Price including GST

$1,100.00 + 10% GST

Total price (incl. GST)

$1,210.00

Includes $110.00 of GST.

Price before GST$1,100.00

GST (10%)$110.00

Price including GST$1,210.00

Adding GST multiplies the price by 1.1 — the GST is one-eleventh of the new total.

Worked examples

Adding GST to an invoice

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.

Reversing GST from a receipt

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.

When is my BAS due?

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. Lodging online or through a registered tax or BAS agent can give you extra time.

Quarter	Period	Due date
Q1	July – September	28 October
Q2	October – December	28 February
Q3	January – March	28 April
Q4	April – June	28 July

How to calculate GST in Australia

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.

Reverse GST calculator

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.

GST registration threshold — do I need to register?

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.

Official sources

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.

How to Use This Calculator

1Choose Add GST (your price is before GST) or Remove GST (your price already includes GST).
2Enter the amount. GST is a flat 10%, so there is nothing else to set.
3Read off the price before GST, the GST component and the price including GST.
4Use Remove GST on supplier invoices and receipts to find the GST credit you can claim.

What is GST?

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.

GST essentials

The rate is 10%: Flat across the country. Add GST by multiplying by 1.1; the GST inside an inclusive price is that price ÷ 11.
$75,000 threshold: Register for GST once your GST turnover hits $75,000 ($150,000 for not-for-profits).
GST-free vs input-taxed: Basic food, health, education and exports are GST-free; residential rent and financial supplies are input-taxed.
BAS reporting: Registered businesses report GST on a BAS — usually quarterly, due the 28th after the quarter (28 Feb for the December quarter).

Getting GST right

•The GST in a total is one-eleventh of it, not 10% — dividing by 11 avoids the classic overstatement.
•Keep tax invoices for purchases of more than $82.50 (incl. GST) to claim the GST credit.
•You can register for GST before you hit $75,000, but then you must charge GST and lodge a BAS.
•Prices advertised to consumers must be shown GST-inclusive.

Frequently Asked Questions