GST Calculator (Australia)

Add 10% GST to an amount, or extract the GST from a GST-inclusive price.

Amount ($) Direction

How GST is calculated

GST in Australia is 10%. To add GST, multiply the GST-exclusive amount by 1.1. To find the GST inside a GST-inclusive price, divide the total by 11. Example: an invoice total of $1,100 includes $100 GST ($1,100 ÷ 11).

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Disclaimer: TaxDates provides general information only, current at the date shown on each page. It is not tax, legal or financial advice, and does not consider your circumstances. Deadlines can change and exceptions may apply — always confirm with the ATO, ASIC or a registered tax professional.