Calculate Australian GST in seconds.
The fast, friendly way to add or remove 10% GST on any amount. No sign-ups, no subscriptions, just the right number every time.
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Pick the scenario that matches your situation and we'll take it from there.
What is a GST calculator?
A GST calculator Australia is a tool that takes the guesswork out of applying the 10% Goods and Services Tax to any dollar amount. Whether you're a sole trader quoting a client, a small business owner checking a supplier invoice, or an accountant reconciling a BAS, you need to know the GST component fast and accurately.
This australian gst calculator handles two common scenarios every business faces. The first is adding GST to a price that doesn't yet include tax, the type of amount you'd quote to a business-to-business client. The second is removing GST from a GST-inclusive price to find the net amount, which is useful when you've received an invoice and need to separate the tax from the base cost for your bookkeeping.
Australia's GST has been fixed at 10% since 1 July 2000. That makes the maths straightforward, but even simple calculations go wrong when you're rushing through a quote or checking five invoices at once. This tool gives you the right number every time, consistent with the formulas published by the Australian Taxation Office (ATO). Our team built it for the specific needs of Australian businesses, with no conversions, no overseas tax rates, and no clutter.
How the calculator works
Expand any card to see detailed step-by-step instructions and the exact formulas we use.
What every Australian business owner should know
Three key areas that shape your GST obligations. Read the details when you need them.
The $75,000 threshold
You must register for GST once your annual GST turnover reaches $75,000 ($150k for non-profits). Learn how to calculate your turnover correctly.
Read the guideSupply TypesGST-free vs taxable
Fresh food, medical services, education, and exports are GST-free. Financial services and residential rent are input-taxed. The full breakdown.
See the listReportingBAS made simple
Report GST collected and GST credits each quarter through the Business Activity Statement. Step-by-step lodgment guide with deadlines.
Learn BASBuilt for every Australian who deals with GST
From sole traders and freelancers to accountants and property investors. If you touch GST, this tool saves you time.
Sole traders & freelancers
Add GST to client quotes and get the inclusive total ready for your invoice in seconds.
Small business owners
Verify supplier invoices and separate GST components when entering transactions into your books.
Accountants & bookkeepers
Quick sanity-check against accounting software during BAS preparation and data entry.
Property buyers & sellers
Work out GST on new residential and commercial property transactions. See our property GST guide.
Consumers & shoppers
Understand how much of a price went to tax. Handy for budgeting or comparing receipts.
Importers & online sellers
Calculate GST on imported goods and digital services. See our imports guide.
Want to go deeper on Australian GST?
Ten detailed guides covering registration, BAS lodgment, invoicing, input tax credits, and common mistakes. All free, all 100% Australia-focused.
Browse the full GST guide libraryFrequently asked questions
Everything you need to know about Australian GST calculations.
Frequently Asked Questions
The Australian GST rate is 10%. This rate has remained unchanged since the GST was introduced on 1 July 2000 under the Howard government. The 10% rate applies uniformly to all taxable goods and services, with no reduced rates for different product categories as seen in some other countries' value-added tax systems.
To add GST to a GST-exclusive price, simply multiply the amount by 1.10. For example, if an item costs $100 before GST, the GST-inclusive price is $100 × 1.10 = $110. The GST component is $10. This is the standard method used by Australian businesses when quoting prices to customers.
To find the GST-exclusive amount from a GST-inclusive price, divide by 1.10. For example, if a product costs $110 including GST, the GST-exclusive amount is $110 ÷ 1.10 = $100, and the GST component is $10. Alternatively, you can find just the GST amount by dividing the inclusive price by 11.
Several categories are GST-free under Australian law, including most basic food items (fresh fruit, vegetables, meat, bread, milk), certain medical services, some educational courses, childcare, exports, and some charitable activities. Water and sewerage services provided by government are also GST-free. The ATO maintains a detailed list of GST-free items on their website.
You must register for GST if your business has an annual GST turnover of $75,000 or more (or $150,000 for non-profit organisations). Taxi drivers and ride-sharing drivers must register regardless of turnover. You can choose to register voluntarily if your turnover is below the threshold, which allows you to claim GST credits on business purchases.
A Business Activity Statement (BAS) is a form submitted to the Australian Taxation Office (ATO) by registered businesses to report and pay their GST obligations, along with other tax obligations such as PAYG withholding and PAYG instalments. Most businesses lodge BAS quarterly, though some with higher turnover lodge monthly. BAS must be lodged even if there is nothing to report for that period.
GST is a value-added tax collected at every stage of the supply chain, with businesses claiming credits for GST paid on their inputs. This differs from the previous Wholesale Sales Tax (WST) that Australia used before 2000, which was only applied once at the wholesale level. The multi-stage collection of GST makes it harder to evade and creates a self-policing mechanism where businesses have an incentive to ensure their suppliers are correctly charging GST.
Yes, GST-registered businesses can claim input tax credits for GST included in the price of goods and services purchased for business purposes. To claim a credit, you must hold a valid tax invoice, the purchase must be for a creditable purpose, and you must be registered for GST. Credits are claimed through your BAS. You cannot claim credits for purchases used for making input-taxed supplies like financial services or residential rent.
Since 1 July 2017, GST applies to imported services and digital products (such as streaming services, apps, and e-books) when purchased by Australian consumers. From 1 July 2018, GST also applies to imported physical goods valued at or below $1,000. Overseas sellers with Australian sales exceeding $75,000 annually must register for and collect Australian GST.
This calculator uses the exact formulas specified by the Australian Taxation Office for GST calculations. The 10% GST rate is applied precisely using standard mathematical operations. Results are rounded to two decimal places following standard Australian currency conventions. While this tool is accurate for standard GST calculations, complex scenarios involving mixed supplies or special rules should be discussed with a registered tax agent.