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Add or remove 10% GST instantly. For Australian business owners, sole traders, bookkeepers, and anyone invoicing with or without GST.
Result
Amount ex-GST
Before tax
$0.00
GST (10%)
Tax component
$0.00
Amount inc-GST
Total to charge / pay
$0.00
Batch Calculator
Enter multiple line items
GST Quick Reference
GST-Free (0% GST)
Taxable (10% GST applies)
Always verify with the ATO's GST-free list ↗ for your specific product or service.
Tax Invoice Requirements
A valid tax invoice allows your customer to claim GST credits. It must include all of the following:
Supplier's identity
Business name as registered with ABN Lookup
Australian Business Number (ABN)
Your 11-digit ABN must be clearly stated
The words "Tax Invoice"
Must appear on the document
Date issued
The date the invoice is created
Description of goods/services
Clear enough for the buyer to claim GST credits
GST amount shown separately
OR a statement that the price includes GST (only if total ≤ $1,000)
Price of the supply
Ex-GST and GST-inclusive amounts
Recipient's identity (if >$1,000)
Buyer's name or ABN for invoices over $1,000
For invoices under $1,000 you can use a simplified tax invoice showing just the total amount inc-GST and the words "price includes GST". For invoices over $1,000, all fields above are required.
Quick reference — common amounts
| Amount | Ex-GST | GST (10%) | Inc-GST |
|---|---|---|---|
| $100.00 | $100.00 | $10.00 | $110.00 |
| $250.00 | $250.00 | $25.00 | $275.00 |
| $500.00 | $500.00 | $50.00 | $550.00 |
| $1,000.00 | $1,000.00 | $100.00 | $1,100.00 |
| $2,500.00 | $2,500.00 | $250.00 | $2,750.00 |
| $5,000.00 | $5,000.00 | $500.00 | $5,500.00 |
| $10,000.00 | $10,000.00 | $1,000.00 | $11,000.00 |
| $25,000.00 | $25,000.00 | $2,500.00 | $27,500.00 |
Click any row to load it into the calculator.
What is GST?
GST (Goods and Services Tax) is a 10% tax on most goods and services sold in Australia. Businesses registered for GST must charge GST on taxable sales and can claim GST credits on business purchases.
Do I need to register?
You must register for GST if your turnover is $75,000 or more per year ($150,000 for non-profits). You can voluntarily register below this threshold. Ride-share and taxi drivers must register regardless of turnover.
GST-free items
Some goods and services are GST-free: basic food, medical services, educational courses, childcare, and most exported goods. Always check the ATO's current list for your specific product or service.
The formulas
Add GST:
Price × 1.1 = inc-GST
Price × 0.1 = GST amount
Remove GST:
Price ÷ 1.1 = ex-GST
Price − (Price÷1.1) = GST
ATO GST resources
For GST registration, BAS lodgement, and GST-free items, refer to the Australian Taxation Office ↗
To add 10% GST to a price, multiply it by 1.1. For example, a $500 service becomes $550 inc-GST, with $50 being the GST component. When issuing a tax invoice, you must show the GST amount separately or state that the price includes GST.
To find the pre-GST amount from a GST-inclusive price, divide by 1.1. The GST component is the difference: inc-GST minus ex-GST. Never divide by 0.9 — this gives the wrong answer. Our calculator uses the correct formula automatically.