GST Inclusive vs Exclusive Calculator Australia

Convert Australian prices between GST-exclusive and GST-inclusive amounts using the standard 10% GST rate. Enter a price and the converter shows both directions at once.

Australian GST formulas

To add 10% GST: exclusive amount × 1.10. To remove GST from an inclusive amount: inclusive amount ÷ 1.10. The GST component of an inclusive amount is inclusive amount × 10 ÷ 110, or inclusive amount ÷ 11. The GST component calculator focuses on the extraction step.

Worked example: a Gold Coast landscaper compares quotes

A Gold Coast landscaper needs plants from a wholesaler and gets two quotes. Supplier A quotes $220 GST-exclusive. Adding GST gives $220 × 1.10, which is $242. Supplier B quotes $242 GST-inclusive. Removing GST gives $242 ÷ 1.10, which is $220 ex-GST, and the GST component is $242 ÷ 11, which is $22. Once converted to the same basis, the quotes are identical, so the landscaper chooses Supplier A for the better payment terms rather than the price. Try $220 in the converter above: the exclusive-to-inclusive direction shows A$242.00, confirming the maths. The lesson is to convert every quote to the same basis before you compare.

Common uses

• Retail and service price checks
• Invoice and quote calculations
• Comparing GST-inclusive and exclusive supplier prices
• Checking simple bookkeeping entries

Practical tips for quoting and comparing

Convert every quote to the same basis before comparing, because a GST-exclusive quote always looks cheaper than it is. State the basis on your own quotes: “$220 plus GST” or “$242 including GST” leaves no room for argument. Business-to-business quotes in Australia are usually GST-exclusive, while retail prices shown to consumers are usually GST-inclusive. When you invoice, the GST on invoice calculator builds the total from the ex-GST figure.

Important

This calculator does the maths only. It cannot tell you whether a sale is taxable, GST-free or input-taxed.

Frequently asked questions

Do shops have to show GST-inclusive prices?

Prices shown to consumers generally include GST, so the price on the shelf is the price you pay.

Why do business quotes often exclude GST?

It is convention in business-to-business trade. A GST-registered buyer claims the GST back as a credit, so the ex-GST figure is the real cost to them.

What happens if I mix up inclusive and exclusive?

You either undercharge by absorbing the GST yourself or overcharge by adding GST twice. Converting first avoids both mistakes.

Does this converter handle GST-free items?

No. GST-free and input-taxed supplies have no GST in the price, so the conversion does not apply to them.

Use the main Australian GST calculator or review current rules at the ATO.