GST Calculator
Quickly add or remove Australia's 10% Goods and Services Tax from any amount, whether you're pricing an invoice or working out what tax is hiding in a receipt.
Your details
Price including GST
$110
Price excluding GST
$100
GST (10%)
$10
Price including GST
$110
Uses the standard Australian GST rate of 10%. Some supplies are GST-free or input-taxed (like most basic food, health and education), in which case this calculator doesn't apply. Not tax advice, check ato.gov.au or speak with a registered tax agent for your specific situation.
How to use this calculator
- 1. Select 'Add GST' if you have a GST-exclusive price and want to know the final price. Select 'Remove GST' if you have a GST-inclusive price and want to know how much of it is tax.
- 2. Enter the price you're starting with.
- 3. See the GST-exclusive price, the GST amount, and the GST-inclusive price, all at once.
How GST actually works
GST is a 10% tax added to most goods and services sold in Australia. If a business is registered for GST, which is compulsory once turnover reaches $75,000 a year, it has to add GST to what it charges and can generally claim back the GST it pays on business purchases. That's why the price on a shelf or a website is usually already GST-inclusive, the 10% is baked into the number you see, while a business invoice will often show the GST-exclusive price and the GST as two separate line items. The two directions of this calculator reflect those two situations: adding 10% on top of an exclusive price, or backing the tax out of an inclusive one.
Why you can't just take 10% off an inclusive price
A common mistake is multiplying a GST-inclusive price by 10% to find the tax component, but that overstates it. If a $110 price includes GST, the GST-exclusive price is $100, and the GST is $10, which is 1/11th of $110, not 10% of it. That's because the 10% was added to the original $100, not to the $110 total. This calculator does the correct division for you, so you always get the right split whether you're pricing something for sale or working out how much tax is in a receipt.
FAQ
What is the GST rate in Australia?
10%. It has been 10% since GST was introduced in 2000 and applies to most goods and services, with some exceptions.
What items are GST-free?
Most basic food, many health and medical services, most education courses, and some childcare are GST-free. Some financial supplies and residential rent are input-taxed, which is treated differently again. Check ato.gov.au for the full list if you're unsure about a specific item.
Do I need to register for GST?
Registration is compulsory once your business turnover reaches $75,000 a year ($150,000 for non-profits), or immediately if you're a taxi or rideshare driver, regardless of turnover. You can register voluntarily below the threshold too.
How do I work out the GST-exclusive price from a GST-inclusive price?
Divide the GST-inclusive price by 1.1. For example, $220 divided by 1.1 is $200 GST-exclusive, with $20 of GST included in the original $220.
Is GST the same as sales tax in other countries?
It's similar in concept to a VAT (value-added tax) used in the UK, EU and elsewhere, but the exact rates, exemptions and rules differ by country. Don't assume figures from another country's calculator apply here.
Money tips, straight to your inbox
Free calculators, guides and the occasional useful thing. No spam, unsubscribe anytime.
Disclaimer
This calculator uses the standard Australian GST rate of 10%. It doesn't account for GST-free or input-taxed supplies, which are treated differently and don't have GST added or removed the same way. This tool provides estimates only, is not tax advice, and doesn't replace advice from a registered tax agent or ato.gov.au.