Australian GST Calculator: Easily Calculate Prices With and Without Tax
Quickly work out Australia’s 10 % Goods & Services Tax: enter any price, choose “incl.” or “excl.” GST, and the tool shows the tax plus both price versions. Over 1.3 million Australian businesses lodge GST in their Business Activity Statement each quarter (ATO, 2023).
GST Calculator (Australia)
Price Excluding GST:
GST Amount:
Price Including GST:
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How to use the tool
Amount (AUD): Type your figure, e.g. 89.99 or 1 250.00. No symbols are needed.
Price Type: Pick Excluding GST when the amount is pre-tax, or Including GST when tax is already added.
Hit “Calculate GST”: The tool instantly displays three values—Price ex GST, GST Amount, and Price inc GST.
Copy the results: Paste them into invoices, budgets or BAS worksheets.
Core formulas
If price is excluding GST:
$$\text{GST} = \text{Price}_{ex} \times 0.10$$
$$\text{Price}_{inc} = \text{Price}_{ex} \times 1.10$$
If price is including GST:
$$\text{Price}_{ex} = \text{Price}_{inc} rac 1.10$$
$$\text{GST} = \text{Price}_{inc} \times 0.0909$$
Worked examples
Example 1 — Ex GST input: 89.99 → GST = 9.00, Inc GST = 98.99
Example 2 — Inc GST input: 440.00 → Ex GST = 400.00, GST = 40.00
Quick-Facts
Standard GST rate: 10 % since 1 July 2000 (ATO, “GST basics”, 2023).
GST-free items include basic food and some health services (ATO, “GST-free sales”, 2023).
BAS lodgement is quarterly for most small businesses (ATO, “BAS due dates”, 2023).
GST is a 10 % value-added tax on most goods and services sold in Australia, collected by businesses and remitted to the ATO (ATO, 2023).
How does the calculator find GST on a tax-inclusive price?
It divides the entered amount by 1.10 to reveal the pre-tax price, then subtracts to obtain GST.
Which sales are GST-free?
Basic food, many medical services, education courses and most exports carry 0 % GST (ATO, 2023).
How often must you report GST?
Most small entities lodge a Business Activity Statement every quarter; larger ones do it monthly (ATO, 2023).
Does the tool follow official rounding rules?
Yes. It rounds to the nearest cent, exactly as the ATO’s “rounding GST” guidance states: “Round to two decimal places only once the final tax is calculated” (ATO, 2022).
Can you claim GST back when exporting goods?
Exporters can claim input-tax credits on GST paid for business purchases, and the exported product itself is GST-free (ATO, 2023).
What formula converts Ex GST to Inc GST?
Multiply the pre-tax price by 1.10 to add the 10 % tax.
What’s a common GST error this tool prevents?
Many users wrongly multiply an inclusive price by 0.10; the correct method first isolates the base price, preventing over-statement of tax.
Important Disclaimer
The calculations, results, and content provided by our tools are not guaranteed to be accurate, complete, or reliable. Users are responsible for verifying and interpreting the results. Our content and tools may contain errors, biases, or inconsistencies. Do not enter personal data, sensitive information, or personally identifiable information in our web forms or tools. Such data entry violates our terms of service and may result in unauthorized disclosure to third parties. We reserve the right to save inputs and outputs from our tools for the purposes of error debugging, bias identification, and performance improvement. External companies providing AI models used in our tools may also save and process data in accordance with their own policies. By using our tools, you consent to this data collection and processing. We reserve the right to limit the usage of our tools based on current usability factors.
