GST Calculator Australia 2026
Add or remove Australian GST from prices in AUD. Standard 10%, or GST-free / input-taxed at 0% for education. Built for invoices, quotes, and GST-inclusive receipts.
By Sammy S. · Founder · AuthorUpdated for 2026
Calculate Australian GST (AUD)
Choose add or remove, pick the supply type, and enter the amount — results update instantly.
Your inputs
Mode, amount (AUD), and supply type
Enter the net (ex-GST) price to get the GST-inclusive total.
Most goods and services — standard ATO rate
GST registration generally applies from $75,000 GST turnover (ATO). This calculator models a single price line — not your BAS.
Gross total (incl. GST)
10% GST$110.00
$100.00 × 10% = $10.00 GST.
Add or remove GST for invoices, quotes, and receipts.
The GST amount and total (or ex-GST price) above come from the amount, add/remove mode, and supply type you enter — not a live ATO feed. The standard rate and registration threshold match published ATO guidance. Below are the formulas, steps, and worked examples from the same engine as the live calculator.
Worked example — add 10%
Add 10% GST — $100.00 net
| Mode | Add GST |
| Net amount | $100.00 |
| Rate | 10% |
| GST | $10.00 |
| Inclusive total | $110.00 |
$100.00 × 10% = $10.00 GST → $110.00 inclusive
Worked example — remove 10%
Remove 10% GST — $110.00 inclusive
| Mode | Remove GST |
| Gross (incl. GST) | $110.00 |
| Rate | 10% |
| Net (ex-GST) | $100.00 |
| GST embedded | $10.00 |
$110.00 ÷ 1.10 = $100.00 net; GST = $10.00 (also 1/11)
GST-free education mode (0%)
GST-free education mode: GST $0.00, total $100.00
Formulas
- Add GST — GST amount: GST = Net price × (10 ÷ 100)
- Add GST — inclusive total: Total with GST = Net + GST
- Remove GST — ex-GST price: Net = Gross ÷ (1 + 10 ÷ 100)
- Remove GST — GST embedded: GST = Gross − Net
- 1/11 shortcut (standard rate): GST embedded = Gross × (1 ÷ 11)
- Rounding: All AUD amounts rounded to the nearest cent (2 decimal places)
Calculation steps
- Confirm the supply typeTaxable 10% · GST-free 0% · Input-taxed 0%
Most goods and services are taxable at the standard rate. GST-free and input-taxed supplies use 0% in this tool for education — they are not invented reduced rates.
- Choose add or remove modeAdd: amount is ex-GST · Remove: amount includes GST
Add mode prices a net figure up to a customer total. Remove mode backs GST out of an invoice or receipt gross.
- Add GSTGST = Amount × Rate; Total = Amount + GST
Multiply the net price by the rate, then add GST to get the inclusive total.
- Remove GSTNet = Gross ÷ (1 + Rate); GST = Gross − Net
At the standard rate, GST is also one-eleventh of the GST-inclusive price (ATO 1/11 rule).
- Round to centsround(value, 2) — half-up to 2 decimals
Matches typical invoice rounding. Tiny differences can appear if you add then remove on odd amounts.
Key takeaways — Australia GST
- Australian standard GST is 10% on most taxable goods and services (ATO).
- GST-free and input-taxed supplies are charged at 0% — they are not a reduced-rate band.
- You generally register for GST when GST turnover reaches $75,000 (ATO).
- To add GST: multiply net by the rate. To remove GST: divide inclusive by (1 + rate), or take 1/11 of the inclusive price at the standard rate.
- Example: $100.00 net taxable → $10.00 GST → $110.00 inclusive.
Add GST, remove GST, and the 1/11 fraction
Same engine as the live calculator. Example at 10%: $100.00 × 10% = $10.00 GST → $110.00 inclusive
GST = net × 0.1 · Total = net + GST
$100.00 × 10% = $10.00 → $110.00
Net = gross ÷ 1.10 · GST = gross − net
$110.00 ÷ 1.10 = $100.00 (GST $10.00)
GST embedded = gross × (1 ÷ 11)
$110.00 × 1/11 = $10.00
What is GST in Australia?
Goods and Services Tax (GST) is a broad-based consumption tax on most goods, services, and other supplies consumed in Australia. GST-registered businesses generally charge GST on taxable sales and may claim input tax credits on related purchases.
The standard rate is 10%. Australia does not publish a UK-style reduced rate band — supplies are typically taxable, GST-free, or input-taxed under ATO rules.
The 1/11 rule
When a price already includes 10% GST, the GST component is one-eleventh of the inclusive price. Example: on $110.00 inclusive, GST is $10.00 and the ex-GST amount is $100.00.
Use Remove GST mode whenever the figure you see is GST-inclusive (retail shelf prices, many receipts).
GST-free vs input-taxed
GST-free and input-taxed both mean you do not charge GST on the sale, but input tax credit rules differ. GST-free sales often still allow related credits if you are registered; input-taxed sales usually restrict credits.
This calculator’s GST-free and input-taxed options run at 0% so you can see the identity maths — they do not decide whether your real-world supply qualifies. Check ATO GST-free and input-taxed guidance for your category.
GST-inclusive vs GST-exclusive pricing
Consumer-facing retail prices in Australia are typically GST-inclusive. If a shelf price already includes GST, use Remove GST mode to find the net and GST split for bookkeeping.
B2B invoices for GST-registered sellers usually show net, GST, and total. For a $100.00 net taxable line: GST $10.00, total $110.00.
When registration matters for pricing
You generally must register for GST if your GST turnover is $75,000 or more (or you expect it to be). Below that, registration can still be voluntary in some cases. Once registered, you must charge the correct GST treatment on supplies and lodge activity statements.
Registration is about GST turnover over a period — not whether a single invoice equals a particular dollar amount.
Taxable, GST-free, and input-taxed
ATO supply treatments used in this calculator. There is no invented reduced GST rate — qualifying supplies are GST-free or input-taxed at 0%.
| Supply type | Rate | Examples | Note |
|---|---|---|---|
| Taxable | 10% | Most goods and services sold in Australia by GST-registered businesses | Default — charge GST and generally claim related input tax credits if registered |
| GST-free | 0% | Many basic foods, some education and health supplies, exports, and other categories listed by the ATO | No GST charged; registered businesses may still claim related input tax credits (conditions apply) |
| Input-taxed | 0% | Many financial supplies and residential rent (see ATO input-taxed sales guidance) | No GST charged; input tax credit recovery is usually restricted |
Rate & registration facts
Sourced from ATO registering for GST and how Australian GST works.
| GST registration (general) | GST turnover of $75,000 or more (ATO) |
| Standard GST rate | 10% |
| GST in an inclusive price | 1/11 of the GST-inclusive amount (ATO) |
GST on common net amounts
Engine-sourced ladder — same math as the calculator. Open an amount page for a dedicated FAQ.
Myths vs facts
Myth: Australia has a reduced GST rate like the UK’s 5%.
The standard rate is 10%. Qualifying supplies are GST-free or input-taxed at 0% under ATO rules — this tool does not invent reduced percentages.
Myth: GST only matters once you hit A$100,000 turnover.
ATO registration generally applies from $75,000 GST turnover — not A$100,000.
Myth: GST-free and input-taxed are the same for credits.
Both charge 0% on the sale, but input tax credit recovery usually differs. Always check ATO guidance for your supply type.
Myth: To remove GST you just subtract 10% of the inclusive price.
At 10%, GST is 1/11 of the inclusive price — not 10% of the inclusive amount. Example: $110.00 inclusive → GST $10.00, not $11.00.
Glossary
- GST
- Goods and Services Tax — Australia’s broad-based consumption tax on most taxable supplies.
- Taxable supply
- A supply charged at the standard 10% rate when made by a GST-registered entity (subject to ATO rules).
- GST-free
- No GST charged on the sale; related input tax credits may still be available if registered (conditions apply).
- Input-taxed
- No GST charged on the sale; input tax credit recovery is usually restricted (see ATO input-taxed sales).
- 1/11 rule
- At the standard 10% rate, GST embedded in an inclusive price is one-eleventh of that price.
- GST registration threshold
- $75,000 GST turnover — general ATO registration requirement.
Common GST quoting mistakes
Who this helps
Checklist before you quote GST
- Confirm whether the supply is taxable, GST-free, or input-taxed — not every “essential” item is GST-free.
- Decide if your quote is ex-GST (B2B / registered) or GST-inclusive (typical consumer retail).
- Use remove mode on receipt totals that already include GST.
- Track GST turnover against the $75,000 registration threshold.
- Keep GST records if registered; activity statements are usually lodged regularly.
- Cross-check unusual product categories on ATO GST-free and input-taxed guidance.
Amount pages
Related tools
- Sole Trader Calculator Australia — Turnover, expenses, GST flag, and PAYG instalments
- Superannuation Calculator Australia — Employer SG, concessional cap room, and Division 293
- Sole Trader vs Employee Australia — Cash take-home vs Super Guarantee package
- Australia paycheck calculator — Employee PAYG gross → net
- Net to Gross Australia — Salary needed for a take-home target
- VAT Calculator UK — Add or remove UK VAT at 20% / 5% / 0%
- GST/HST Calculator Canada — Canadian sales tax by province
Limitations
Does not model BAS lodgement, input tax credits, GST groups, margin schemes, or whether a supply is GST-free versus input-taxed. For sole trader income tax see sole trader calculator Australia; for UK VAT see VAT calculator UK; for Canada see GST/HST calculator; for AU take-home pay see Australia paycheck calculator.
Australia GST calculator FAQ
Related calculators
Turnover, expenses, GST & PAYG flags
Cash tie + Super Guarantee gap
SG, concessional cap & Div 293
Transfer duty by state + FHB
Rank NSW, VIC, QLD & more
Gross to net PAYG
AUD salary for take-home
Add or remove IRD-standard 15% GST