Adding GST Goods and Services Tax in NZ is 15% To add 15% GST on $100 $100 x 15% = $15 GST $100 + $15 GST = $115 GST Inclusive. A quick way to Add GST is to Multiply the GST exclusive amount by 1.15

If a price does not include GST, then the full GST-inclusive price can be found by adding 15%: $100 GST-exclusive price multiplied by 15% GST rate = $15 Add $15 of GST to the $100 GST-exclusive price = $115 price including GST.

If you want to know how to calculate GST, there are a few steps to take. Firstly, the GST rate for New Zealand is 15%. This means that 15% of the sales price of your goods or services is added to the sale to result in a GST-inclusive sales price. An easy formula to find your GST-inclusive price is multiplying the sale price by 1.15.