GST Calculator Australia

Australian GST Calculator — Add or Remove GST Instantly

The Goods and Services Tax (GST) is a 10% tax applied to most goods and services sold in Australia. Whether you're a business owner preparing invoices, a freelancer quoting clients, or a consumer wanting to know the tax-inclusive price, this calculator makes GST calculations instant and accurate.

How GST Works in Australia

GST was introduced on 1 July 2000 and is administered by the Australian Taxation Office (ATO). The current rate is 10% and applies to most goods and services. Some items are GST-free, including basic food, medical services, and educational courses.

GST Formulas

Adding GST: Multiply the ex-GST amount by 1.1. For example, $100 ex-GST becomes $110 inc-GST.

Removing GST: Divide the inc-GST amount by 11 to find the GST component. For example, $110 inc-GST contains $10 GST and $100 ex-GST.

Finding the GST component: Divide the GST-inclusive price by 11. This gives you the GST amount. Subtract it from the total to get the ex-GST price.

Who Needs to Register for GST?

You must register for GST if your business has a GST turnover of $75,000 or more per year ($150,000 for non-profit organisations). Taxi drivers and ride-sharing drivers must register regardless of turnover. Registration is done through the ATO and you'll need an Australian Business Number (ABN).

BAS and GST Reporting

If you're registered for GST, you need to lodge a Business Activity Statement (BAS) — either monthly or quarterly. Your BAS reports GST collected on sales and GST paid on purchases. The difference is what you owe (or are owed) by the ATO.

Common GST Mistakes

• Charging GST when not registered (illegal)
• Forgetting to claim GST credits on business purchases
• Not issuing tax invoices for sales over $82.50 (inc GST)
• Incorrectly applying GST to GST-free items