GST Calculator (Australia)
Add or remove 10% GST from any amount. Instant, free, no sign-up.
$
GST rate: %
Net (excluding GST)
$0.00
GST (10%)
$0.00
Total (including GST)
$0.00
Australian GST — the basics
GST (Goods and Services Tax) is a flat 10 % tax on most goods, services, and other items sold or consumed in Australia. Businesses with a turnover of $75,000 or more must register for GST.
How to calculate GST
- Add GST to a net amount: multiply by 1.10.
e.g. $100 × 1.10 = $110 inc-GST - Remove GST from a total: divide by 11 to get the GST, or by 1.10 to get the net.
e.g. $110 ÷ 11 = $10 GST, $110 ÷ 1.10 = $100 net
FAQ
Do I include GST on my invoices?
If your business is GST-registered, yes — your invoices must show GST as a separate line and say "Tax Invoice".
Do all products have 10% GST?
No. Some items are GST-free (most basic food, some medical, some education). The ATO has a complete list.