Free GST Calculator for Australia

Add GST, remove GST, or check if an expense is taxable - instantly.

No sign-up, no ads, nothing to install.

How to use

  1. Add GST - enter your ex-GST amount and the calculator returns the GST component and the GST-inclusive total. Use this when quoting customers or raising invoices.

  2. Remove GST - enter a GST-inclusive amount and the calculator extracts the GST component and the net (ex-GST) amount. Use this when reconciling supplier invoices or completing your BAS.

  3. GST-Free Check - search any expense type to see whether it attracts GST, is GST-free, or needs further checking. Covers 40+ common business expenses.

    The standard Australian GST rate is 10%, set by the A New Tax System (Goods and Services Tax) Act 1999. You can also calculate at 0% for GST-free supplies or enter a custom rate for other jurisdictions.


Use case examples

  • Bookkeepers & accountants - quickly extract the GST component from a supplier invoice before coding it in Xero or MYOB

  • Tradies & contractors - check whether your quote should include GST, and calculate the exact amount to add before sending

  • Small business owners - work out how much GST you owe or can claim back when preparing your quarterly BAS

  • Accounts payable teams - verify the GST component on incoming invoices matches what the supplier has charged

  • Freelancers - calculate GST on your invoices if you're registered, or check the threshold ($75,000 turnover) before registering


GST across Australian states

GST is a federal tax that applies uniformly across all Australian states and territories - NSW, QLD, VIC, WA, SA, TAS, ACT and NT. The rate is 10% regardless of where your business is located or where goods are delivered. There is no separate state-level GST in Australia.

For reference only. Always confirm GST treatment with your accountant or the ATO.