## Calculation formula

How to calculate Goods and Services Tax for New Zealand

To find the cost including GST, multiply the amount exclusive of GST by 1.15.

**Example:** $100.00 * 1.15 = $115.00

To calculate GST component, multiply your GST-inclusive amount by 3 then divide by 23.

**Example:** GST-inclusinve cost is $200.00. GST component is 200 * 3 / 23 = $26.09