GST Exclusive Calculator NZ

This calculator finds the GST-exclusive amount and the 15% GST content from any New Zealand price, or works the other way and adds GST onto an exclusive figure, so you always know exactly how a total splits between GST and the underlying charge. It matters whenever you are pricing invoices, checking a supplier bill, filling in a GST return, or simply want to know how much of a receipt is tax. You choose whether your figure is GST-inclusive (to remove GST) or GST-exclusive (to add GST), then enter the dollar amount. If you are removing GST, the calculator returns the GST-exclusive amount as the headline result, alongside the GST content at 15 percent and the original GST-inclusive total for reference. If you are adding GST, it flips around and shows the GST-inclusive total as the headline figure, with the GST content and your original exclusive amount underneath. The maths follows the method Inland Revenue uses: dividing an inclusive total by 1.15 gives the exclusive amount, and multiplying by 3 then dividing by 23 gives the GST content directly, both of which avoid the rounding drift that comes from simply taking 15 percent off the total. For example, a $115 GST-inclusive total is $100 exclusive of GST, with $15 of GST content. Use it to check invoices, prepare a GST return, or quote a price either way with confidence.

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