Useful before precise
Our tools help Australian consumers and businesses add or remove GST, prepare invoice and BAS estimates, and understand common GST classifications and thresholds.
About
Who publishes GST Calculator, what it provides, and how its work is maintained.
Last updated: 28 July 2026
Who publishes this website
GST Calculator is published and maintained by MoneyToolkit, an independent Australian publisher of practical financial calculators and plain-English guides.
MoneyToolkit is responsible for the calculators, editorial content, updates, and corrections on this site. We use a publisher identity so the work is accountable without requiring an individual contributor to make their personal identity public.
We are not affiliated with the ATO, Australian Border Force, an accounting practice, payment provider, or invoicing platform. Advertising does not influence results or editorial conclusions.
What we build
The site includes the core GST calculator plus invoice, BAS, bulk-pricing, registration, property, fuel-tax-credit, luxury-car-tax, wine-tax, tourist-refund, input-credit, and classification tools.
They are designed for quick checks by consumers, sole traders, bookkeepers, and small businesses before figures are verified in accounting records.
Sources you can inspect
We prioritise ATO guidance, Australian tax legislation, official rates and thresholds, and agency guidance relevant to customs and indirect taxes.
Reviewed when inputs change
We prioritise review when GST legislation, ATO rulings or guidance, registration thresholds, related tax rates, or calculator logic changes.
Private by design
Calculator inputs are processed in your browser. You can use the tools without creating an account or sending the values you enter to us.
How to assess our work
Read the calculator methodology for the model, assumptions, and sources, and the editorial policy for our sourcing, review, and independence standards. If something appears wrong or out of date, the corrections policy explains how to report it.
Important limitation
Actual GST treatment can depend on registration, tax periods, invoice validity, supply classification, apportionment, special rules, and transaction facts the calculator cannot know. Verify material amounts in your records or with a registered tax or BAS agent.