GST Calculator NZ

What is the GST calculator?

In New Zealand, a GST calculator is a tool used to calculate the Goods and Services Tax (GST) component of a price, or to determine the total price including GST, or the price excluding GST. GST in New Zealand is a flat tax rate of 15% applied to most goods and services, and it's typically included in the displayed price of items (known as the "GST-inclusive price").

For official information on GST in New Zealand, please refer to the Inland Revenue Department (IRD) GST information page.

How do I calculate GST?

To calculate GST in New Zealand, you need to know whether you're starting with a GST-exclusive price (price without GST) or a GST-inclusive price (price with GST already included). The GST rate is 15%.

What is the GST rate on a calculator?

The GST rate on a calculator (as in a physical calculator you buy) in New Zealand is 15%, the standard rate applied to most goods and services. Whether you're buying a basic calculator or a scientific one, GST is added to the price unless it's a zero-rated or exempt item (which calculators are not).

Example:
If a calculator costs $20 excluding GST:
GST = $20 × 0.15 = $3
Total price = $23 (incl. GST)

The question might also imply the GST rate used by a calculator tool, which is still 15% in New Zealand for all standard GST calculations.

How do you calculate GST from a total?

If you have a GST-inclusive total (price with GST already added), you can calculate the GST amount and the GST-exclusive price using these steps:

• GST amount = Total price ÷ 23 × 3
• GST-exclusive price = Total price ÷ 1.15

Example: Total price is $115 (incl. GST):
GST = $115 ÷ 23 × 3
$115 ÷ 23 = 5
5 × 3 = $15 (GST amount)
GST-exclusive price = $115 ÷ 1.15 = $100

This method works because 15% GST means the GST amount is 3/23 of the total price (derived from the ratio of 0.15 to 1.15).

How do I add GST to an invoice?

To add GST to an invoice in New Zealand, follow these steps:

1. Start with the GST-exclusive amount: This is the base price of your goods or services before GST.
2. Calculate the GST: Multiply the GST-exclusive amount by 0.15 (15%).
   GST = GST-exclusive amount × 0.15
3. Add GST to get the total: Add the GST amount to the GST-exclusive amount.
   Total = GST-exclusive amount + GST (or GST-exclusive amount × 1.15)
4. Show both on the invoice: For transparency, list the GST-exclusive amount, the GST amount, and the GST-inclusive total.

If you're GST-registered, include your GST number on the invoice as required by Inland Revenue (IRD).

How do you calculate GST in numbers?

This likely means calculating GST with specific numerical examples. Here's how it works in practice with New Zealand's 15% GST rate:

These calculations can be done manually or with a calculator by plugging in the numbers and using the formulas above.