How to Use This GST Calculator
Our Australian GST calculator is designed for simplicity and accuracy. Start by entering the amount you want to calculate in the input field. Then select whether you're working with a GST-exclusive amount (where you need to add GST) or a GST-inclusive amount (where you need to extract the GST component). Click "Calculate GST" to see your results instantly, including the original amount, GST amount, and total.
For GST-exclusive calculations, the calculator multiplies your base amount by 1.1 to determine the total including GST. For GST-inclusive calculations, it divides your total by 11 to find the GST component, giving you both the net amount and the tax portion. These are the official formulas used by the Australian Taxation Office.
Frequently Asked Questions
When should I use GST Exclusive vs GST Inclusive?
Use GST Exclusive (Add GST) when you have a base price and need to calculate the total including GST – common when creating invoices or quotes. Use GST Inclusive (Remove GST) when you have a total price and need to determine how much GST is included – useful when reviewing receipts or checking competitor prices. Most retail prices in Australia are displayed GST-inclusive, while business-to-business quotes are often GST-exclusive.
Is the GST calculation always exactly 10%?
Yes, Australia has a flat GST rate of 10% on all taxable supplies. Unlike some countries with multiple tax rates, Australian GST is straightforward. However, not all goods and services attract GST. Items like basic food, medical services, and some educational courses are GST-free. Our calculator uses the standard 10% rate and also offers a 0% option for GST-free items to help you with all your calculations.
Can I use this calculator for my business BAS?
While our calculator provides accurate individual GST calculations, we recommend using it as a verification tool alongside your accounting software for Business Activity Statement preparation. It's perfect for double-checking invoice amounts, verifying supplier charges, or understanding GST on specific transactions. For official BAS lodgement, ensure you maintain proper records and consider consulting with a registered BAS agent or accountant.
What items are GST-free in Australia?
Several categories of goods and services are GST-free in Australia. These include most basic food items (such as fresh fruit, vegetables, meat, bread, and milk), certain health and medical services (doctor visits, hospital treatments, prescription medicines), some education courses and related materials, childcare services, exports of goods and services, water and sewerage charges, and certain supplies by charities and religious institutions. However, prepared food, confectionery, snack foods, and restaurant meals are generally subject to GST. For a comprehensive and up-to-date list, refer to the ATO website.
How do I calculate GST from a total price?
To calculate the GST component from a GST-inclusive total price, divide the total amount by 11. For example, if a product costs A$110 including GST, the GST amount is $110 / 11 = $10, and the price before GST is $110 - $10 = $100. Alternatively, you can divide the total by 1.1 to find the GST-exclusive price, then subtract that from the total to get the GST amount. Our calculator handles both methods automatically when you select the "GST Inclusive (Remove GST)" option.
What is the GST registration threshold?
You must register for GST in Australia if your business has a GST turnover of $75,000 or more per year (gross income minus GST). For non-profit organisations, the threshold is higher at $150,000 or more per year. If you are a taxi or ride-sharing driver, you must register for GST regardless of your turnover. You can also voluntarily register for GST even if your turnover is below the threshold, which allows you to claim GST credits on your business purchases. Registration is completed through the ATO or via the Australian Business Register (ABR).
How often do I need to lodge BAS?
Business Activity Statements (BAS) are generally lodged quarterly, with due dates on the 28th of the month following the end of each quarter (for example, 28 October for the July-September quarter). However, if your GST turnover is $20 million or more, you must lodge monthly. Small businesses with a GST turnover under $10 million may also be eligible to report and pay GST annually. The ATO will notify you of your specific lodgement frequency when you register for GST. If you lodge through a registered tax agent or BAS agent, you may be eligible for extended due dates.
Can I claim GST credits on business expenses?
Yes, if you are registered for GST, you can claim GST credits (also called input tax credits) for the GST included in the price of goods and services you purchase for your business. To claim a GST credit, the purchase must be for business use, the supplier must have charged you GST, you must have a valid tax invoice, and you must be registered for GST. You cannot claim GST credits for purchases that are for private use, relate to making input-taxed sales, or where the supplier is not registered for GST. If a purchase is partly for business and partly for private use, you can only claim the business portion of the GST credit.