GST calculator
This GST calculator adds 10% GST to a price, removes GST from a GST-inclusive amount, or builds a labour hire invoice from hours and an hourly rate. It shows the amount excluding GST, the GST and the total, using the 10% rate that applies across Australia.
Updated 12 November 2026 · Uses 2026-27 figures
Add or remove GST
Choose a mode, then enter an amount, or hours and a rate for an invoice.
General information only, not financial, tax or legal advice. Results are estimates based on 2026-27 figures and the assumptions shown. Check your award, agreement or a qualified adviser for your situation.
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Get a quote Call 0477 567 567How to use the GST calculator
- Choose what you want to do: add GST, remove GST, or build a labour hire invoice.
- To add or remove GST, enter the amount. Use the price before GST to add it, and the GST-inclusive price to remove it.
- For an invoice, enter the hours worked and the charge rate per hour excluding GST.
- Read the amount excluding GST, the GST and the total including GST.
How to calculate GST
GST in Australia is 10% of the price of most goods and services. The three calculations you need are:
| Task | Formula | Example |
|---|---|---|
| Add GST | Price × 1.1 | $1,000 × 1.1 = $1,100 |
| GST in a GST-inclusive price | Price ÷ 11 | $1,100 ÷ 11 = $100 |
| Remove GST | Price ÷ 1.1 | $1,100 ÷ 1.1 = $1,000 |
A common mistake is to take 10% off a GST-inclusive price. Taking 10% off $1,100 gives $990, which is wrong. The GST is one eleventh of the total, so the price before GST is $1,000.
Worked example
Adding GST: $1,000 plus 10% GST is $1,100. The GST is $100.
Removing GST: a receipt for $1,100 including GST contains $100 of GST, so the amount excluding GST is $1,000.
Labour hire invoice: 152 hours at $48.00 an hour comes to $7,296.00 excluding GST. GST is $729.60, and the invoice total is $8,025.60.
When do you need to register for GST?
You must register for GST once your business has a GST turnover of $75,000 or more a year ($150,000 for non-profit organisations). Taxi and ride-sourcing drivers must register regardless of turnover. GST turnover is your total business income, not profit, excluding GST and some other amounts. You can register voluntarily below the threshold.
Once registered you charge GST on taxable sales, issue tax invoices, lodge business activity statements (BAS) and claim GST credits for GST included in your business purchases. If you are not registered you must not charge GST, and your invoices should not show a GST amount.
Do I need to include GST on my invoice?
If you are registered and the sale is taxable, yes. A tax invoice for $1,000 or more must show the buyer's identity or ABN. For sales under $1,000 the rules are simpler, but the invoice must still show that the price includes GST.
GST on labour hire and wages
Labour hire services are a taxable supply, so a GST-registered agency adds 10% GST to its invoices. A host business that is registered for GST can usually claim the GST back as a credit on its BAS, so the real cost is the amount excluding GST. Wages paid to your own employees are not subject to GST.
Contractors with an ABN charge GST only if they are registered. If a contractor's income is approaching $75,000, they need to register. The ABN tax calculator helps contractors set aside tax as well.
What is GST-free?
Some goods and services are GST-free, including most basic food, many medical and health services, some education courses and childcare, and exports. Items such as bank fees on loans are input-taxed, which means no GST is charged and no credit can be claimed. Items like electricity, merchant fees from payment providers and most business services do include GST. If you are unsure, check the ATO's guidance for that item.
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Frequently asked questions
What is GST?
GST, the goods and services tax, is a 10% tax on most goods, services and other items sold or consumed in Australia. Businesses registered for GST collect it on their sales and pay it to the ATO, and claim credits for the GST in their business purchases.
How much is GST in Australia?
GST is 10% of the price before GST. That means it is one eleventh of a GST-inclusive price. On a $110 item, $10 is GST.
How do you calculate GST from a total?
Divide the GST-inclusive total by 11. On a total of $550, the GST is $50 and the amount excluding GST is $500. Do not take 10% off the total, as that gives the wrong answer.
How do you remove GST from a price?
Divide the GST-inclusive price by 1.1. For example, $2,200 ÷ 1.1 = $2,000 excluding GST, and the GST is $200.
When do I need to register for GST?
When your GST turnover reaches $75,000 a year, or $150,000 for non-profits. You must also register if you provide taxi or ride-sourcing services, whatever your turnover. You can choose to register earlier.
Do I need to register for GST as a sole trader?
Only if your GST turnover is $75,000 or more a year, or you drive for a taxi or ride-sourcing service. Below that it is optional. If you are not registered, do not charge GST on your invoices.
Is GST charged on labour hire?
Yes. Labour hire is a taxable supply, so a registered agency adds 10% GST to the invoice. A GST-registered host can usually claim that GST back on its BAS.
How do I invoice without GST?
If you are not registered for GST, issue an invoice that shows your ABN, the date, a description of the work and the amount, with no GST added. Do not label it a tax invoice. Once your turnover reaches $75,000 you need to register and start charging GST.
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Sources and assumptions
General information only, not financial, tax or legal advice. Results are estimates based on 2026-27 figures and the assumptions shown. Check your award, agreement or a qualified adviser for your situation.