Use the GST calculator to estimate the tax component of an amount. It is useful for checking how a stated rate changes a pre-tax price or for extracting tax from a tax-inclusive total.
How to use this calculator
Enter the requested values, review the assumptions shown by the tool and select Calculate. Try more than one scenario to understand how changes to your inputs affect the estimated result.
What to consider
Choose the correct rate for the supply and confirm whether the entered price already includes GST. Invoicing and tax treatment may also depend on place of supply, exemptions and other rules.
Frequently asked questions
How do I remove GST from an inclusive amount?
Divide the GST-inclusive amount by one plus the GST rate expressed as a decimal. The difference between the inclusive and base amount is the GST component.
Related calculators
You may also find the Income Tax Calculator and CTC to In-Hand Salary Calculator useful.
Educational estimates only. Not financial, investment, legal or tax advice. Verify applicable rules and figures before making decisions.