Australian GST Calculator 2026
Last verified · Methodology
Enter an amount and choose whether to add GST or remove it. The calculator works in both directions: ex-GST to inc-GST, or inc-GST back to ex-GST. Australia has a single GST rate of 10%.
GST Calculator (10%)
Formula: Inc-GST = Ex-GST x 1.10 ($100.00 x 1.10 = $110.00)
Australia has a single GST rate of 10%. Some supplies are GST-free (basic food, health, education) or input-taxed. Confirm GST status with a registered tax agent or the ATO. Does not constitute tax advice.
| Ex-GST Amount | GST (10%) | Inc-GST Amount |
|---|---|---|
| $50.00 | $5.00 | $55.00 |
| $100.00 | $10.00 | $110.00 |
| $250.00 | $25.00 | $275.00 |
| $500.00 | $50.00 | $550.00 |
| $1,000.00 | $100.00 | $1,100.00 |
| $5,000.00 | $500.00 | $5,500.00 |
Australia has a single GST rate of 10%. This applies to most goods and services supplied in Australia. The GST system is governed by the A New Tax System (Goods and Services Tax) Act 1999. Unlike some countries, Australia has only one rate with no reduced rates for specific categories (apart from GST-free and input-taxed supplies). The rate has been 10% since GST was introduced on 1 July 2000.
GST-free supplies in Australia include most basic food items (fresh food, bread, milk, fruit and vegetables, but not hot food, restaurant meals, or snack foods), health services (most medical, dental, and hospital services), educational courses (school and university tuition), exports, and financial supplies in some circumstances. Child care, aged care, and some charitable activities are also GST-free. Water and sewerage services are generally GST-free for domestic use. Businesses that make GST-free supplies must still register for GST if turnover exceeds $75,000.
To remove GST from an inc-GST price, divide by 1.1. For example, a $110 inc-GST price has $100 ex-GST and $10 GST. The formula is: Ex-GST price = Inc-GST price / 1.1. Equivalently, the GST component is: GST = Inc-GST price / 11. Do not simply multiply by 10% as this gives the wrong answer (10% of $110 is $11, not $10).
A Business Activity Statement (BAS) is the form used by businesses to report and pay GST to the ATO. Businesses registered for GST must lodge BAS quarterly (most small businesses) or monthly (turnover above $20 million). On your BAS you report GST collected on sales (output tax) and GST credits on business purchases (input tax credits). The net amount is paid to or refunded by the ATO. BAS is also used to report PAYG withholding and other business taxes.
You must register for GST if your business has a GST turnover (gross income from sales) of $75,000 or more per year ($150,000 for non-profit organisations), or if you provide taxi or ride-sharing services regardless of turnover. You can voluntarily register if your turnover is below the threshold. Once registered, you must charge GST on your taxable sales and can claim input tax credits on business purchases. Registration is done through the ATO's Business Portal or myGovID.
Both GST-free and input-taxed supplies do not include GST, but the tax treatment differs. For GST-free supplies (such as food and health), the business charges no GST but can still claim input tax credits (GST credits) on related business purchases. For input-taxed supplies (such as financial services and residential rent), the business charges no GST and also cannot claim input tax credits on related purchases. This distinction affects the net GST cost to the business. Input-taxed treatment applies to residential rental income, which means landlords do not charge GST and cannot claim credits on expenses directly related to the rental property.