UK Income Tax Calculator (Take-Home Pay & Salary Calculator)
Calculate UK income tax, National Insurance, and take-home pay for 2024/25 & 2025/26.
Australia GST Calculator (Add or Remove 10% GST & BAS)
Add 10% GST or calculate the 1/11th GST component backwards from inclusive totals.
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About Australia GST Calculator (Add or Remove 10% GST & BAS)
Free Australian GST calculator compliant with the Australian Taxation Office (ATO). Add 10% GST or extract the 1/11th GST component backwards. Includes BAS preparation and GST-free item guides.
How does the Australian Goods and Services Tax (GST) work?
GST in Australia is a broad-based tax of 10% on most goods, services, and other items sold or consumed within Australia. Registered businesses collect GST on behalf of the Australian Taxation Office (ATO) on taxable sales and claim input tax credits for GST included in business purchases.
How to calculate GST backwards using the "Divide by 11" rule
Because GST is 10% added on top of a net base (100% net + 10% GST = 110% total), the GST portion equals exactly 10/110ths, or 1/11th (9.0909%) of the total gross price. To find the GST component of any inclusive Australian price, simply divide the total by 11. For instance, a total of $55.00 contains $5.00 GST ($55 ÷ 11) and $50.00 net.
When must an Australian business register for GST?
Under ATO regulations, you must register for GST within 21 days if your gross business turnover (gross income minus GST) is $75,000 or more per year ($150,000 or more for non-profit organizations), or if you provide taxi or ride-sourcing travel (such as Uber or DiDi) regardless of turnover.
What supplies are GST-free in Australia?
The ATO classifies several essential categories as GST-free: basic fresh groceries (bread, milk, fresh meat, unprocessed fruit and vegetables), medical and healthcare services (GP visits, dental, hospital care), PBS prescription medicines, basic educational courses, childcare, and water/sewerage services.
📐 Methodology & Reference Accuracy:
Calculations, formulas, and conversions execute locally in your web browser. Output models are benchmarked against official reference standards and updated for 2026.
🔒 This tool runs entirely in your browser. Nothing is uploaded or stored.
Background reading: Australia Gst Calculator on Wikipedia. More: all calculators.
Frequently Asked Questions about Australia GST Calculator (Add or Remove 10% GST & BAS)
How do I add GST to a price in Australia?
Multiply the exclusive (net) price by 0.10 to find the GST amount, or multiply by 1.10 to find the total inclusive price. For example: $200 × 1.10 = $220.00 total.
How do I remove GST from a price in Australia?
Divide the inclusive total by 1.10 to get the net amount, or divide by 11 to extract the GST amount. For example: $330 ÷ 11 = $30.00 GST, leaving $300.00 net.
Are secondhand goods subject to GST in Australia?
If sold by a GST-registered business, yes. Private sales between individuals (like casual sales on Facebook Marketplace or Gumtree) are not subject to GST.
What must appear on an Australian Tax Invoice?
For sales of $82.50 or more (incl. GST), a valid tax invoice must include the words "Tax Invoice", the seller's identity and Australian Business Number (ABN), invoice date, description of items sold, and the GST amount or a statement that the total price includes GST.
How does GST fit into my BAS?
Your Business Activity Statement reports GST collected on sales minus GST paid on purchases each quarter. This calculator shows the GST component of any figure instantly, and the BAS card on the results panel summarises the invoicing rules to apply when you lodge.
What does Aus GST apply to at 10%?
Most goods and services sold in Australia carry 10% GST. GST-free categories include basic fresh food, medical and health services, prescription medicines, education, childcare and water. If your sale falls outside those categories, add 10% with the calculator above.
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