Australian GST Calculator — Add or Remove 10% GST
Add 10% GST to a price or back it out of a GST-inclusive total.
✓ 10% GST rate · updated June 2026
Results are estimates for information only, not financial advice. See how we build and verify our calculators.
Australia charges a flat 10% GST on most goods and services. Enter an amount to add GST (you have the ex-GST price) or remove GST (you have the GST-inclusive total — the calculator divides by 11 to find the GST). Useful for invoices, quotes, expense claims and BAS preparation.
How to use the GST Calculator (Australia)
- Enter the amount in dollars.
- Choose Add GST if it's an ex-GST price, or Remove GST if it already includes GST.
- Read the base amount, the GST and the total.
Frequently asked questions
How do I work out the GST in a total?
Divide the GST-inclusive total by 11. A $110 total contains $10 GST — because the total is 110% of the base, the GST is 10/110 = 1/11 of it.
What is exempt from GST in Australia?
GST-free items include most basic food, many health and medical services, education courses and exports. Input-taxed items like residential rent and many financial services also carry no GST.
When must a business register for GST?
Once GST turnover reaches $75,000 ($150,000 for non-profits), or immediately for taxi/ride-share drivers. Registered businesses charge 10% and claim credits for GST paid on inputs via their BAS.