GST Calculator
How to use this GST calculator
The calculator above handles both directions in one tool. Three steps and you’re done.
- Pick what you want to do. Add GST Amount means you have a net price (e.g. a quote you wrote for $100) and want to see what it becomes once 10% GST is added. Remove GST means you have a GST-inclusive total (e.g. a $110 receipt) and want to know how much of that figure is the tax.
- Type the dollar amount. Cents are fine — 100.00, 99.95, 1200, all work. Don’t include the dollar sign; the calculator adds it for you.
- Hit Calculate. Three lines appear: net price, GST component, and the gross (inclusive) total. The figure you’re solving for is bolded in navy at the foot of the result card.
There’s also a Copy result link below the result so you can paste the breakdown straight into a tax invoice, a BAS worksheet, or your bookkeeping software.
What is GST in Australia?
GST is the Goods and Services Tax – a flat 10% consumption tax that applies to most things sold or consumed in Australia. The Howard government introduced it on 1 July 2000 and the rate has not changed since. Despite repeated political conversations about lifting it, the rate has held at 10% for over twenty-five years.
Businesses with annual turnover of $75,000 or more must register for GST, charge it on taxable sales, and remit it to the Australian Taxation Office (ATO) via their Business Activity Statement (BAS). The threshold is $150,000 for non-profits, and there’s no threshold at all for rideshare drivers — every Uber, Ola, DiDi and Bolt driver has to be GST-registered from the first dollar.
Some categories sit outside the standard 10%:
- GST-free items include most basic food, most education, most health services, child care, and exports. No GST is charged, but the supplier can still claim GST credits on their inputs.
- Input-taxed items include financial services and residential rent. No GST is charged and no GST credits can be claimed on related expenses.
For the official rules and current registration thresholds, see the ATO’s GST overview page. For a longer plain-English explainer, our What is GST? guide unpacks the same material without the legalese
GST formula explained
Two formulas cover almost every GST calculation you’ll do.
To add GST to a net price:
Net × 1.10 = Gross (inclusive of GST)
Example: a $100 net invoice → $100 × 1.10 = $110 gross. The $10 difference is the GST.
To remove GST from a gross price:
Gross ÷ 11 = GST component Gross ÷ 1.10 = Net (excluding GST)
Example: a $110 gross receipt → $110 ÷ 11 = $10 GST → $110 − $10 = $100 net.
The reason you divide by 11, not 10, is that GST is one-eleventh of the inclusive total — not one-tenth. A $110 inclusive price is $100 net + $10 GST. Ten dollars is one-eleventh of $110, not one-tenth. Dividing by 10 would over-state the GST and is the single most common mistake new business owners make on their first BAS.
If you only ever need one direction, the Add GST calculator and Reverse GST calculator skip the dropdown and go straight to the input field.
When to use which calculator
This homepage tool covers both directions. The dedicated calculators below are faster for repeat tasks because they skip the dropdown and have built-in worked examples for each scenario.
| Situation | Calculator to use |
| Quoting a customer in net dollars; need the inclusive figure | Add GST Calculator |
| Reading a receipt total; need the GST line for BAS | Reverse GST Calculator |
| Splitting a GST-inclusive total into its net + GST parts | GST Inclusive Calculator |
| Quoting B2B / wholesale ex-GST and need the gross | GST Exclusive Calculator |
| Buying or selling a second-hand car (dealer vs private) | GST on Second-Hand Cars |
| Working out GST on Airbnb / short-stay income | GST on Airbnb |
| Calculating GST on Uber or rideshare fares | GST on Uber |
| Estimating quarterly BAS payment | BAS GST Calculator |
Who should use this calculator
If GST touches your day, you’ll come back here often:
- Sole traders writing invoices and tracking expense GST
- Small business owners preparing quarterly BAS submissions
- Freelancers and contractors quoting clients on net + GST
- Tradies who price jobs net and need to add GST cleanly on the final invoice
- Bookkeepers reconciling supplier receipts where the gross is given but the GST line isn’t
- Buyers comparing quoted prices when one supplier shows ex-GST and another shows inclusive
- Property investors working out GST on commercial rent or short-stay accommodation
You don’t need to be GST-registered to use the calculator. Plenty of people use it just to verify a price they’ve been quoted.
Other GST calculators on this site
We’ve built dedicated calculators for every Australian GST scenario that comes up regularly. Each pairs the calculator with a short guide on the rules.
- Add GST Calculator — net price → 10% GST added
- Reverse GST Calculator — pull GST out of a total
- GST Inclusive Calculator — split a tax-inclusive figure
- GST Exclusive Calculator — ex-GST to inclusive
- GST on Second-Hand Cars — dealer vs private rules
- GST on Airbnb — commercial vs residential rules
- GST on Uber & Rideshare — zero-threshold registration
- BAS GST Calculator — quarterly net BAS estimate
For the underlying maths and tax theory, see our guides on how to calculate GST, how much is GST, and the Australian GST rate.
FAQ
How much is GST in Australia?
GST in Australia is 10%. The rate has been 10% since the tax was introduced on 1 July 2000 and has not changed. It applies to most goods and services, with some exceptions for basic food, health, education, and exports.
How do I calculate GST from a total amount?
Divide the GST-inclusive total by 11 to find the GST component. For example, $110 ÷ 11 = $10 GST. The remaining $100 is the net (GST-exclusive) amount. Use the calculator above and select “Remove GST from a total” to do this automatically.
How do I add 10% GST to a price?
Multiply the net price by 1.10 to add 10% GST. For example, $100 × 1.10 = $110 gross. The $10 difference is the GST. Use the calculator above and select “Add GST to a price” to do this in one click.
Is this calculator updated for 2026?
Yes. The Australian GST rate is currently 10%, unchanged since 2000, and this calculator uses that rate. We monitor the ATO for any rate change and would update the tool the same day a change took effect.
Do I need to charge GST as a sole trader?
You must register for GST and charge it on taxable sales if your annual turnover is $75,000 or more. Below that threshold, registration is optional. Rideshare drivers (Uber, Ola, DiDi) must register from the first dollar regardless of turnover. See the ATO’s registering for GST page for the official rule.
What’s the difference between GST inclusive and GST exclusive?
GST-inclusive means the price already contains the 10% GST. A $110 inclusive price = $100 net + $10 GST. GST-exclusive (or ex-GST) means GST has not yet been added — a $100 ex-GST price becomes $110 once GST is added. Australian Consumer Law requires retail prices shown to consumers to be GST-inclusive. B2B and wholesale quotes are typically ex-GST. See our GST inclusive vs exclusive guide for examples.
Sources: Australian Taxation Office, Australian Consumer Law via the ACCC.
Last updated: 7 May 2026 · By Bobby
The calculators and guides on gstcalculator.net.au are for general information only and do not constitute tax, financial, or legal advice. Consult a registered tax agent for advice specific to your situation.