About Us
ANZ GST Calculator is a free online utility for common Goods and Services Tax calculations in New Zealand and Australia.
The site is designed to make everyday GST arithmetic easier to check. It provides calculators, worked examples, formulas, and links to official tax information so users can understand how a result is produced rather than relying on a black-box number.
What We Provide
- New Zealand GST tools for common 15% GST calculations, including adding GST, removing GST from an inclusive amount, and finding the GST component.
- Australian GST tools for common 10% GST calculations, including adding GST, removing GST, and finding the GST component.
- Formulas and examples that show the arithmetic used by each calculator.
- Official references to New Zealand Inland Revenue and the Australian Taxation Office where relevant.
Who This Site Is For
ANZ GST Calculator is for anyone who needs a quick, checkable GST figure: small business owners preparing invoices, freelancers working out the tax on a quote, students learning GST arithmetic, and shoppers who want to see the GST inside a price. No account is needed and every calculator is free to use.
How We Approach Accuracy
Our calculators use the standard GST arithmetic applicable to the calculation described on each tool. We show the formula and, where useful, an example so the result can be independently checked.
Tax rules can change and some GST situations depend on facts that a simple calculator cannot determine. For that reason, the site does not present a calculator result as personalised tax, accounting, or legal advice.
Sources and Methodology
We use official New Zealand and Australian tax authority guidance as our primary reference for GST rules. Read our Sources & Methodology page for the formulas and source approach.
Updates and Corrections
We review the site’s calculators and supporting information when changes are identified. If you find an incorrect formula, outdated information, broken link, or other issue, please contact us so it can be investigated and corrected. See our Editorial Policy & Corrections page for more information.
Important Limitation
ANZ GST Calculator provides general-purpose calculation tools and educational information. It does not determine whether a transaction is taxable, GST-free, input-taxed, refundable, or otherwise subject to a particular tax treatment, and it does not replace advice from a qualified professional.
Independent and Unofficial
This site is independent. It is not affiliated with, endorsed by, or acting on behalf of Inland Revenue (New Zealand), the Australian Taxation Office, or any other government body. For binding tax requirements, always check the official guidance on ird.govt.nz or ato.gov.au.
Contact
Questions, corrections, and feedback can be sent to contact@anzgstcalculator.com.