Calculate GST in seconds

Add 10% GST to a price, or find the GST hiding inside a total. Built for Australian businesses, sole traders and anyone who just needs a quick, accurate answer.

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Do you need to register for GST?

Online GST registration for all Australian Businesses, Sole Traders, Partnerships, Companies and Trusts. It's quick and easy.

  • Registered in as little as 2 business hours
  • Applications reviewed by ATO agents
  • One simple form, done online
Register for GST →
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About the Australian Goods and Services Tax (GST)

What is GST?

GST, or Goods and Services Tax, is a tax paid by consumers on most goods and services sold in Australia. It's currently set at 10%, added on top of the sale price. Introduced in 2000 under Prime Minister John Howard, GST was designed to broaden and diversify the taxes the government collects, and now applies to almost every industry, including online and digital purchases.

GST is ultimately paid by the end consumer. Businesses registered for GST collect it on the ATO's behalf, generally folding it into the price so it's simple for customers. Being registered also means a business can claim back the GST it pays on its own purchases (see GST credits below).

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Do I need to register for GST?

You must register for GST if:

  • your business has a GST turnover of $75,000 or more a year (or you expect it to), or
  • your non-profit organisation has a turnover of $150,000 or more a year, or
  • you provide taxi, limousine or ride-sourcing services (including Uber, Didi or Ola). This applies regardless of turnover.

GST turnover is your business's gross income, not its profit: an online store selling $80,000 of goods must register even if it only keeps $40,000 after costs. If you expect to exceed the threshold, you have 21 days to register. Registering is optional (but allowed) if your turnover is below $75,000.

You'll need an ABN before you can register for GST. ABN Assist can help if you don't have one yet, and GST Register can have you registered online in a couple of minutes once you are.

If your turnover is under the $75,000 threshold, there's no penalty for staying unregistered: you simply don't charge GST and can't claim GST credits. But if your turnover is at or above the threshold and you don't register, the ATO can require you to pay GST on sales made since the date you were required to register, plus penalties and interest.

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How is GST calculated?

Our calculator does the maths both ways:

  • Adding GST: take 10% of the sale price and add it on. A $1,000 sale becomes $1,100.
  • Subtracting GST: take 1/11th away from a GST-inclusive total. A $1,100 total contains $100 of GST, because the total is 110% of the original price and GST is 10 of those 110 parts, not simply 10% of the total.
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What are GST credits?

GST credits are money a registered business can claim back from the ATO for the GST included in its own business purchases. For example, Laura runs an accounting firm and buys a new office computer for $1,100, including GST. Because GST is one-eleventh of the sale price, Laura paid $100 in GST. Because her business is GST-registered, she can claim that $100 back as a credit against what she owes the ATO.

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What items are GST-free in Australia?

Most sales in Australia include GST, but some common categories are GST-free, including:

  • most basic food, like fresh fruit and vegetables, meat, bread without a sweet coating, and milk;
  • most medical and health services, and some medical aids and appliances;
  • some education courses, though course materials like textbooks usually aren't GST-free;
  • exports of goods and services.

Each category has its own exceptions, so if you're not sure whether something you sell is GST-free, check the ATO's guidance on GST-free sales.

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What are my obligations once registered?

Once registered for GST, a business needs to:

  • charge GST on its taxable sales and show it correctly on invoices;
  • lodge a Business Activity Statement (BAS), usually quarterly or monthly;
  • keep receipts and tax invoices to support any GST credits claimed.
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Could registering early be worth it?

Even under the $75,000 threshold, registering voluntarily can sometimes increase net profit once GST credits are factored in. Here's a worked example:

Example: A business with $60,000 turnover registers for GST, charging an extra 10% on its services. Turnover including GST becomes $66,000, with $6,000 owed to the ATO.

If its expenses were $40,000 (GST-inclusive), it paid $3,636 of that in GST ($40,000 ÷ 11), a GST credit. Net GST owed to the ATO is $2,364 ($6,000 minus $3,636).

Taxable profit is $23,636 ($66,000 turnover minus $40,000 expenses minus $2,364 GST owed). At an example 30% tax rate, tax payable is $7,090.80, leaving a net profit of $16,545.20.

Unregistered, the same business would show a taxable profit of $20,000 ($60,000 minus $40,000), pay $6,000 tax on it (at the same example rate), and net $14,000, which is $2,545.20 less than if it had registered.

Every number above can be checked with the calculator at the top of this page. If the numbers work in your favour, GST Register can get you registered online in a couple of minutes.

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Frequently asked questions

GST (Goods and Services Tax) is a broad-based tax of 10% on most goods and services sold or consumed in Australia. It was introduced in 2000 and is ultimately paid by the end consumer, with registered businesses collecting it on the ATO's behalf.

Consumers pay GST as part of the price of most goods and services. Businesses registered for GST collect it on every taxable sale, remit it to the ATO, and can claim GST credits back on their own business purchases.

Registered businesses add GST to their taxable sales, lodge a BAS to report what they've collected, and claim GST credits for the GST included in their business expenses. The difference is what's paid to, or refunded by, the ATO.

To add GST, multiply a price by 10% and add it on: a $1,000 sale becomes $1,100. To find the GST already inside a total, divide by 11: a $1,100 total includes $100 of GST.

GST credits let a GST-registered business claim back the GST included in the price of business purchases. A $1,100 GST-inclusive computer purchase includes a $100 GST credit, which reduces the GST owed to the ATO on the next BAS.

You must register if your business has a GST turnover of $75,000 or more a year ($150,000 for non-profits), or if you provide taxi, limousine or ride-sourcing services, regardless of turnover. GST Register can get you registered online in a couple of minutes.

You need an ABN to register for GST. If you already have one, you can register online in minutes through a service like GST Register. If you don't yet have an ABN, ABN Assist can help you get one first.

If your turnover is under the threshold, there's no penalty. But if you're required to register and don't, the ATO can make you pay GST on sales made since the date you were required to register, plus penalties and interest. GST Register can help if you're not sure where you stand.

Once registered, you need to charge GST on taxable sales, show it correctly on invoices, lodge a BAS (usually quarterly or monthly), and keep records to support any GST credits you claim.

Registering lets you claim GST credits on business purchases, which can improve net profit even for businesses under the threshold. See the worked example in the About GST section above.

10%. It's been 10% since GST was introduced in 2000, with no change since, though some goods and services are GST-free or input-taxed instead of carrying the standard rate.

Common GST-free categories include most basic food, most medical and health services, some education courses, and exports of goods and services. See the full list above for the detail and exceptions.

Yes. GST is a federal tax administered by the ATO, so the 10% rate and rules are identical in every state and territory, including NSW, VIC, QLD, WA, SA, TAS, the ACT and the NT.

A GST-exclusive price is the amount before GST is added, what a business actually earns from the sale. A GST-inclusive price has that 10% already added and is what the customer pays. Our calculator's Add GST and Subtract GST modes convert between the two.

GST turnover is your business's gross income from sales, before expenses, not your profit. It's what determines whether you need to register: once it reaches $75,000 a year, registration becomes compulsory regardless of how much profit you actually keep.

Usually yes, for purchases with a customs value of $1,000 or less, charged at the point of sale the same as an Australian purchase, provided the overseas seller is GST-registered. Goods over $1,000, or a bulk order that totals over $1,000 in one parcel, are taxed at the border instead.