Use this free Australia GST calculator to add 10% GST to a price or find the GST inside a GST-inclusive amount, so you see the price, GST and total instantly.
Australian GST · 10% rateAustralia GST Calculator
Amounts are rounded to the nearest cent, so check your tax invoice for the exact GST charged.
Our free Australia GST calculator works out the 10% Goods and Services Tax in seconds, so you never have to do the maths yourself. To begin with, choose whether to add GST to a price or find the GST inside a total. Then enter the amount, and the calculator shows the price before GST, the GST and the total. In addition, it handles GST-free items and multiple items.
How the Australia GST Calculator Works
GST in Australia is 10% on most goods and services. Therefore, the maths is simple once you know whether your price already includes GST.
First of all, multiply the price before GST by 1.1.
Then, for a GST-inclusive price, divide the total by 11.
Finally, subtract the GST from the total, or divide the total by 1.1.
The formulas
Total = Price × 1.1 · GST in a total = Total ÷ 11
GST Calculator Examples
For example, here are three everyday situations, so you can see how the maths works.
A plumber quotes $100 before GST for a small job.
- Firstly: $100 × 10% $10.00
- Then: $100 + $10 $110.00
- Finally: GST share 9.09%
Similarly, a TV costs $550 including GST, and you want to claim the GST.
- Firstly: $550 ÷ 11 $50.00
- Then: $550 − $50 $500.00
- Finally: GST to claim $50.00
In contrast, $40 of fruit and vegetables is GST-free.
- Firstly: $40 × 0% $0.00
- Then: total $40.00
- Finally: GST to claim $0.00
GST Quick Reference Table
Use this table for common amounts. In other words, the last column shows the GST already inside a GST-inclusive price.
| Amount | GST to add | Total with GST | GST inside amount |
|---|---|---|---|
| $10 | $1.00 | $11.00 | $0.91 |
| $50 | $5.00 | $55.00 | $4.55 |
| $100 | $10.00 | $110.00 | $9.09 |
| $250 | $25.00 | $275.00 | $22.73 |
| $500 | $50.00 | $550.00 | $45.45 |
| $1,000 | $100.00 | $1,100.00 | $90.91 |
| $5,000 | $500.00 | $5,500.00 | $454.55 |
| $10,000 | $1,000.00 | $11,000.00 | $909.09 |
GST-Free and Input-Taxed Sales
- GST-free: for example, most basic food, many health services, most education courses and exports have no GST.
- Input-taxed: similarly, residential rent and most financial services have no GST, although the seller can’t claim GST credits on related costs.
- Taxable: however, almost everything else, including takeaway food and most services, carries 10% GST.
Who Must Register for GST?
According to the Australian Taxation Office, a business must register within 21 days once its GST turnover reaches $75,000. For non-profits, the threshold is $150,000 instead. In addition, taxi and rideshare drivers must register whatever their turnover.
Tax Invoices and BAS
When a GST-registered customer asks, you must give a tax invoice for sales over $82.50 including GST. Also, registered businesses report GST on a Business Activity Statement (BAS), usually every quarter, although some report monthly or yearly.
How to Use the GST Calculator
- To begin with, choose whether to add GST or find the GST in a price.
- Then enter the amount in Australian dollars.
- After that, choose taxable or GST-free, and enter a quantity if needed.
- Finally, press Calculate GST to see the price, GST and total.
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Australia GST Calculator FAQs
How do I calculate 10% GST?
To begin with, multiply the price before GST by 0.1 to get the GST. Then add it to the price, or simply multiply by 1.1. For example, $100 plus GST is $110.
How do I work out the GST in a GST-inclusive price?
Divide the total by 11, because the GST is one-eleventh of a GST-inclusive price. So, for a $110 total, the GST is $10 and the price before GST is $100.
Why is GST one-eleventh of the total?
Since GST is 10% of the price, the total is 110% of the price. Therefore, the GST is 10 parts out of 110, which is the same as one-eleventh.
What is GST-free in Australia?
Most basic food, many health and medical services, most education courses and exports are GST-free. However, prepared food, such as takeaway meals, usually includes GST.
When do I need to register for GST in Australia?
You must register within 21 days once your GST turnover reaches $75,000, or $150,000 for a non-profit. In addition, taxi and rideshare drivers must register whatever their turnover.
Can I use this GST calculator for invoices?
Yes, since it shows the price before GST, the GST and the total. However, a valid tax invoice also needs details such as your ABN, so follow the ATO’s tax invoice rules.
Disclaimer: Overall, this calculator gives an estimate for general information only and is not tax advice. Also, GST treatment depends on what you sell, so check the ATO’s guidance or a tax agent for business decisions.