GST Calculator
Calculate Australian Goods and Services Tax (GST) instantly. Add GST to prices, remove GST from totals, or extract the GST component from any amount.
GST Calculator
Understanding Australian GST
The Goods and Services Tax (GST) is a 10% tax on most goods, services, and other items sold or consumed in Australia. GST was introduced on 1 July 2000 and is collected by businesses on behalf of the Australian Taxation Office (ATO).
Standard GST Rate
Applied to most goods and services in Australia
Registration Threshold
Must register if annual turnover exceeds $75,000
Reporting Method
Report GST via Business Activity Statement
GST Calculation Formulas
Add GST
Example: $100 × 1.1 = $110 (inc GST)
Remove GST
Example: $110 ÷ 1.1 = $100 (ex GST)
Extract GST
Example: $110 ÷ 11 = $10 (GST)
Why Divide by 11?
When GST is 10% of the original price, it's 1/11 (≈9.09%) of the GST-inclusive total. This is because $100 + $10 GST = $110, and $10 is 1/11 of $110.
GST-Free Goods and Services
Not everything attracts GST. Some items are GST-free, meaning no GST is charged:
GST-Free Items
- Most basic foods (bread, milk, fruit, vegetables, meat)
- Medical services and most medicines
- Most education courses
- Child care services
- Exports
Input-Taxed (No GST Credit)
- Residential rent
- Financial services (loans, insurance)
- Sale of existing residential premises
GST Registration Requirements
You must register for GST if:
Must Register
- GST turnover is $75,000+ (business)
- GST turnover is $150,000+ (not-for-profit)
- You provide taxi or ride-sharing services
- You want to claim fuel tax credits
Optional Registration
- Turnover below threshold but want to claim input tax credits
- Business-to-business sales (looks more professional)
- Planning to grow above threshold soon
What is GST Turnover?
GST turnover is your gross business income (excluding GST) plus the gross income of connected businesses. It's calculated on a rolling 12-month basis or your expected turnover for the next 12 months.
Business Activity Statement (BAS)
If you're registered for GST, you must lodge a Business Activity Statement (BAS) to report and pay your GST.
| Reporting Period | Who | Due Date |
|---|---|---|
| Monthly | GST turnover $20m+ | 21st of following month |
| Quarterly | Most small businesses | 28th of following month |
| Annually | Voluntary registrations under $75k | 28 February |
Frequently Asked Questions
How do I calculate GST in Australia?
To add 10% GST to a price, multiply by 1.1. To remove GST from a GST-inclusive price, divide by 1.1. To find just the GST component, divide the total by 11.
Do I need to charge GST if I'm not registered?
No. If you're not registered for GST, you cannot charge GST on your sales. However, you also cannot claim GST credits on your purchases.
What's the difference between GST-free and input-taxed?
GST-free means no GST is charged, but you can still claim input tax credits on related purchases. Input-taxed means no GST is charged AND you cannot claim credits on related purchases (e.g., residential rent).
Can I get a GST refund?
Yes, if your GST credits (GST paid on purchases) exceed your GST collected on sales, you'll receive a refund via your BAS. This commonly happens for new businesses with startup costs or exporters.
Related Resources
Disclaimer
This calculator uses the standard Australian GST rate of 10%. Some goods and services may be GST-free or input-taxed. For complex GST matters, consult the ATO or a registered BAS agent.