Tax Calculators
1 live · 2 coming soon
GST, income tax and stamp duty calculators using ATO and state rates.
- GST Calculator
- Income Tax Calculator Soon
- Stamp Duty Calculator Soon
Rates from the ATO and state revenue offices
Built on Australia's own rules and rates
Australia Calculators and Tools
Calculators built for Australia: GST, ATO tax rates, superannuation and stamp duty by state. Every tool links to its official source and shows when it was checked.
- tools live
- 3
- categories
- 3
- more on the way
- 3
- rates last checked
- 29 Oct
Featured Australia tool
GST Calculator
Add 10% GST to a price, or find the GST already included in a total. In Australia GST is 10% of the GST-exclusive price, which means the GST inside a GST-inclusive price is one eleventh of it. The calculator shows the amount excluding GST, the GST and the amount including GST together.
Tax Calculators Checked 29 Oct 2026 Runs in your browser
Open the GST Calculator
Worked example
$110 including GST. The GST is $110 ÷ 11 = $10.00, so the price excluding GST is $110 − $10 = $100.00. Going the other way, adding GST to $100 gives $100 × 10% = $10 GST and a GST-inclusive price of $110.00.
Every Australia tool
Tax, bills, land, exams and more
Live tools open straight away. Tools marked Coming soon are being built and checked against the official source first.
Pay and Super
1 live · 1 coming soon
Take-home pay and superannuation guarantee calculators.
- Super Calculator
- Pay Calculator Soon
Rates from the ATO and super guarantee rules
Home and Auto
1 live
Home loan repayment and car loan calculators in Australian dollars.
Rates from standard lender amortization formulas
Why trust the numbers
Checked against the official source
A calculator is only as good as its rates. Every Australia tool shows where its numbers come from and when they were last checked.
Source linked
Each tool links to the law, notice or tariff it uses.
Date shown
The last-checked date sits on every tool page.
Worked example
A step-by-step example lets you check the maths yourself.
Recently checked
Updated when a budget, tariff or price changes| Date | Tool | Source |
|---|---|---|
| GST Calculator | Australian Taxation Office: GST | |
| Super Calculator | Australian Taxation Office: Super guarantee | |
| Home Loan Calculator | Moneysmart (ASIC): Mortgage calculator |
Works everywhere
Free tools for everything else
FAQ
Australia tools, explained
Missing a calculator you need? Tell us and we will add it to the list.
Where do the rates come from?
Each tool links to the official notification, law or policy it uses, for example the ATO for GST, income tax and super, and each state revenue office for stamp duty, and shows the date it was last checked.
How often are the rates updated?
Whenever the government or regulator changes them. Income tax and super changes usually start on 1 July with the new financial year. GST has been 10% since it began in 2000.
Are these calculators free?
Yes. Every Australia tool is free, needs no account and works on mobile and desktop.
Are my numbers saved?
No. The calculators run in your browser, so the amounts, salary or marks you enter are never sent to us or stored.
Can I rely on the result for official filing?
Use the result as a careful estimate. For a tax return, invoice dispute or application, the official notice or the department always has the final word, which is why every tool links to its source.