GST Calculator
Add or remove 10% GST (Goods and Services Tax) from any amount. Quick calculation for invoicing and business accounting.
Disclaimer
This calculator provides estimates for general information purposes only. Results should not be relied upon as professional financial, tax, or legal advice. Tax rates and thresholds are based on publicly available ATO data and may change. Always consult a qualified tax agent or financial adviser for advice specific to your circumstances.
Frequently Asked Questions
What is the GST rate in Australia?
How do I calculate GST from a total amount?
Do I need to register for GST?
What is GST?
The Goods and Services Tax (GST) is a 10% value-added tax on most goods and services sold in Australia. It was introduced on 1 July 2000 and is administered by the ATO.
How this calculator works
To add GST, multiply the amount by 1.1. To remove GST from an inclusive price, divide by 11 to find the GST component, or divide by 1.1 to find the price before GST. This calculator handles both directions instantly. The invoice summary section formats the breakdown for business accounting — you can copy the result directly into your invoices or BAS records.
GST-Free Items
Not everything in Australia attracts GST. The following categories are GST-free: fresh food (fruit, vegetables, meat, bread, milk), most healthcare services and medical aids, education courses (tuition fees, course materials), childcare, exports of goods and services, water and sewerage charges, and some religious and charitable activities.
How to Calculate GST for Invoicing
If you are registered for GST, your tax invoices must show the GST amount separately. To calculate the GST component of a GST-inclusive price, divide by 11. For example, a $110 invoice includes $10 GST and $100 ex-GST. To add GST to an ex-GST amount, multiply by 0.1 to find the GST, or multiply the whole amount by 1.1 to get the inclusive price.
BAS Reporting Basics
Businesses registered for GST must lodge a Business Activity Statement (BAS) — usually quarterly. On your BAS you report GST collected on sales (1A) and GST paid on purchases (1B). The difference is what you owe to or are owed by the ATO. Keep tax invoices for all purchases over $82.50 (including GST) to claim input tax credits.
GST Registration Threshold
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). Even if your turnover is below the threshold, you can choose to register voluntarily — this lets you claim GST credits on business purchases. Taxi drivers and ride-share operators must register regardless of turnover.
GST Rates in Australia
| Standard goods and services | 10% GST |
| Fresh food (fruit, veg, meat, bread, milk) | GST-free (0%) |
| Healthcare and medical services | GST-free (0%) |
| Education (tuition fees) | GST-free (0%) |
| Exports of goods and services | GST-free (0%) |
| Financial supplies (loans, bank fees) | Input-taxed (no GST charged, no credits claimed) |
| Residential rent | Input-taxed (no GST charged, no credits claimed) |
| Sale of existing residential property | Input-taxed (no GST charged) |
GST-free means no GST is charged but the seller can still claim input tax credits. Input-taxed means no GST is charged and the seller cannot claim input tax credits.
Worked Examples
Add GST to a $500 consulting service
Total invoice: $550.00 (GST: $50.00)
- Start with the ex-GST price: $500.00
- Calculate the GST component: $500.00 x 10% = $50.00
- Add GST to the base price: $500.00 + $50.00 = $550.00
- Your tax invoice shows: Subtotal $500.00, GST $50.00, Total $550.00
Remove GST from a $1,100 GST-inclusive invoice
Ex-GST price: $1,000.00 (GST component: $100.00)
- Start with the GST-inclusive price: $1,100.00
- Divide by 11 to find the GST component: $1,100.00 / 11 = $100.00
- Subtract GST from the total: $1,100.00 - $100.00 = $1,000.00
- Alternatively, divide by 1.1: $1,100.00 / 1.1 = $1,000.00
Official Sources
All calculations are performed in your browser — your data never leaves your device. Results are for general guidance only and should not be considered professional financial advice.
Built and maintained by Konstantin Iakovlev. Data sourced from the ATO and official Australian government sources.