GST Calculator for Australia
Enter a GST rate you have checked from an official source. No rate is auto-filled. This page is generated at build time and does not collect or store IDs or calculator inputs.
Tax calculations are for general estimation only and are not tax, accounting, or legal advice. Always confirm with your tax authority or a qualified professional. The calculator does not know registration status, marketplace collection rules, exemptions, thresholds, filing rules, or local tax law.
Australia page currency: AUD. Entering 0.00% as a rate does not mean this site has verified that rate for your sale.
This calculator separates net amount, GST amount, and gross amount. It does not choose a tax rate for you. Enter only a rate you have checked for your sale, jurisdiction, product type, and seller status.
- Separate net amount, GST amount, and gross amount.
- Check tax-inclusive versus tax-exclusive pricing with a rate you already verified.
- Model a rate from an official tax authority, seller dashboard, invoice, or qualified professional.
- It does not choose or verify your tax rate.
- It does not verify VAT, GST, HST, PST, QST, or sales tax registration.
- It does not replace tax filing, accounting advice, legal advice, or official tax authority guidance.
- It does not check IBAN, BIC/SWIFT, SEPA eligibility, bank account reachability, payout timing, or bank transfer fees.
- Australian sellers often review AUD settlement, GST handling, shipping cost, and imported or cross-border buyer scenarios together.
- Australia pages use AUD. GST treatment is not assumed unless you explicitly model it with reviewed values.
- Verified GST rates are not part of the current fee data set.
- No IDs or calculator inputs are sent to a server or analytics.
- No site-maintained GST rates are supplied by default.
Manual-rate mode. No site-maintained GST rate is supplied by this calculator, and no rate is inserted automatically.
The rate field is for a value you have checked yourself. Inputs stay in browser state only and should not include VAT IDs, TINs, or personal information.
For a AUD 100.00 sale, enter your checked tax rate and choose whether 100.00 is tax-exclusive or tax-inclusive. The calculator then shows net, tax, and gross amounts using decimal-safe arithmetic.
Tax-exclusive: tax amount = net amount x tax rate. Gross amount = net amount + tax amount.
Tax-inclusive: net amount = gross amount / (1 + tax rate). Tax amount = gross amount - net amount.
If you enter a checked rate of 20% and a net amount of AUD 100.00, the math example shows AUD 20.00 tax and AUD 120.00 gross.
This does not mean this site verified 20% as the correct rate for your sale.
- Using a country-wide rate without checking product, jurisdiction, or marketplace rules.
- Treating marketplace-collected tax as seller income.
- Mixing platform fees and tax amounts in the same line item.
- Using this calculator for tax filing instead of planning.
Does this page choose the correct GST rate?
No. You must enter a rate you have checked from an official source or a qualified professional.
Can I use this for filing?
No. GST calculations are for general estimation only and are not tax, accounting, or legal advice.
Are VAT IDs, TINs, or business IDs required?
No. Do not enter sensitive personal, tax, or business identity information into the calculator.
How does tax-inclusive mode work?
Tax-inclusive mode treats the amount as already containing tax and estimates the net amount and tax portion from your checked rate.