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.
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 — 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 it was introduced on 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 — no conversions, no overseas tax rates, no clutter.
If you run a registered business, you collect GST on your taxable sales, claim back GST on your business purchases as input tax credits, and report the net amount to the ATO through your Business Activity Statement. This calculator supports that workflow by breaking every amount into its component parts: the GST amount, the total including GST, and the amount excluding GST.
Australian GST Guide: What You Need to Know
The calculator handles the numbers. But understanding how GST works in practice helps you avoid costly mistakes on your BAS and keeps your accounts clean. Here's what every Australian business owner should know.
The $75,000 Registration Threshold
You must register for GST once your business's annual GST turnover reaches $75,000 (or $150,000 for non-profit organisations). Turnover means your total business income before expenses — not your profit. If you're a sole trader, contractor, or small business approaching that figure, it's worth monitoring your rolling 12-month income closely.
Taxi drivers and ride-share drivers (Uber, Ola, DiDi) must register regardless of turnover — even if they only drive part-time and earn well below $75,000. New businesses that expect to reach the threshold within 12 months should also register proactively. Once registered, you charge GST on your taxable sales and can claim back GST on business purchases. Our guide on the $75,000 registration threshold walks through exactly when and how to register.
GST-Free vs Taxable vs Input-Taxed Supplies
Not everything you sell or buy carries GST. The ATO divides supplies into three categories:
Taxable supplies — most goods and services in Australia. You charge GST at 10% and can claim input tax credits on related business purchases. This is the standard case this calculator is designed for.
GST-free supplies — items where GST is not charged and no GST is included in the price, but you can still claim credits on purchases you make to produce them. Common examples: most basic foods (fresh fruit, vegetables, meat, bread, milk), some medical and health services, most educational courses, childcare, and exports. See the full breakdown in our list of GST-free items.
Input-taxed supplies — sales where you don't charge GST and can't claim input tax credits on related costs. The main examples are financial services (interest, insurance, lending) and residential rental income. This is why your landlord doesn't add GST to your rent.
Reporting GST: Business Activity Statements (BAS)
Once you're registered for GST, you report and pay your GST obligations through a Business Activity Statement (BAS). Most businesses lodge quarterly — due dates fall roughly one month after the end of each quarter. Businesses with annual turnover above $20 million lodge monthly. Some sole traders with simple tax affairs may be eligible for annual lodgment.
Your BAS asks you to report total GST collected on sales and total GST credits claimed on purchases. The difference is either what you owe the ATO or what the ATO owes you as a refund. Accurate GST calculations throughout the quarter make BAS time much less stressful. Our step-by-step guide on lodging your BAS covers the process in full, including what to do if you made an error on a previous statement.
Who Uses This GST Calculator?
This tool was built for anyone who deals with Australian GST in their day-to-day work — which covers a surprisingly wide range of people.
Sole traders and freelancers use it to add GST to their quotes before sending invoices. A web developer, graphic designer, or bookkeeper charges $1,500 for a project — they need the GST-inclusive total to put on the invoice. Two seconds with this calculator and they have it.
Small business owners use it when checking supplier invoices. When a $2,200 invoice lands in your inbox, you need to know quickly whether that's $2,000 + $200 GST (which you can claim back) or $2,200 flat with no GST component. The remove-GST calculation tells you instantly.
Accountants and bookkeepers use it as a quick sanity check during data entry or BAS preparation. When you've entered 40 transactions and one figure doesn't look right, a fast manual check against this calculator catches the error before it flows through to the client's tax return.
Property buyers and sellers use it to understand GST on new residential property or commercial real estate transactions. New residential premises carry GST — the margin scheme can affect how it's calculated, but the base formula is still the starting point. Read our guide on GST on property for the specifics.
Consumers use it when they want to understand how much of a price they paid went to tax — for instance, when comparing receipts or budgeting for a large purchase where the GST component matters.
Whatever your use case, the calculation is the same. Enter your amount, choose add or remove, and get the breakdown in under a second.
ToolSite Team
We build free, accurate calculators.