To add or remove 15% Goods and Services Tax (GST) from a price, you can use simple formulas or a dedicated GST calculator. Adding GST involves multiplying the GST-exclusive price by 1.15, while removing GST requires dividing the GST-inclusive total by 1.15. Using a GST calculator is the fastest way to ensure accurate results for your business accounting.
What is the GST Rate in New Zealand?
The current standard GST rate in New Zealand is 15%. This rate applies to most goods and services sold within the country. For context, a small number of supplies are treated differently: some are zero-rated (like exports, taxed at 0%), and others are exempt from GST entirely (like residential rent).
How to Add 15% GST to a Price (GST-Exclusive to GST-Inclusive)
To convert a price that does not include tax to one that does, you add 15%. The standard formula is: GST-Inclusive Price = GST-Exclusive Price × 1.15.
Step-by-Step Breakdown
- Start with your GST-exclusive price (the net amount).
- Calculate the GST amount by multiplying the price by 0.15.
- Add the GST amount to the original price to get the final total.
For a practical example, adding GST to a $100 service fee: The GST is $100 × 0.15 = $15. The GST-inclusive price is $100 + $15 = $115.
How to Remove GST from a Total (GST-Inclusive to GST-Exclusive)
To find the original price before tax was added, you perform the reverse calculation. The formula is: GST-Exclusive Price = GST-Inclusive Price ÷ 1.15.
Step-by-Step Breakdown
- Take the total price you paid, which includes GST.
- Divide this total by 1.15 to find the pre-GST price.
- To find the GST component, subtract the result from the original total.
For a practical example, finding the pre-GST price of an item that costs $115: The GST-exclusive price is $115 ÷ 1.15 = $100. The GST amount included is $115 - $100 = $15.
Using a GST Calculator for Accuracy and Speed
While the formulas are straightforward, manual calculations can lead to errors, especially with multiple or complex figures. An online GST calculator automates the process, providing instant and accurate results.
To use one, you simply input your value and select whether you want to add GST or remove GST. The tool will then display the net price, the GST amount, and the gross price. This is invaluable for creating quotes, processing invoices, and maintaining accurate financial records.
For quick and reliable calculations, use our dedicated GST Calculator – Add or Remove 15% GST.
GST-Inclusive vs. GST-Exclusive: What's the Difference?
Clarity on these terms prevents confusion in both business and consumer transactions.
| Term | Definition | Common Use |
|---|---|---|
| GST-Exclusive | The price before GST is added. Also called the 'net' price or '+GST'. | Typically used in business-to-business quotes, wholesale pricing, and supplier invoices. |
| GST-Inclusive | The final price including GST. Also called the 'gross' price or 'inc. GST'. | Mandatory for displayed consumer retail prices in New Zealand, so the tag shows the full amount to pay. |
It is crucial to know which type of price you are dealing with to understand the true cost and for correct accounting.
When Do You Need a Tax Invoice for GST?
If you are a GST-registered business, you need a valid tax invoice to claim back the GST you pay on business expenses (your input tax). According to Inland Revenue rules, a tax invoice is required for all sales over $50. For sales of $50 or less, you must provide one if the customer asks for it.
A compliant tax invoice must clearly show the GST amount charged as a separate line item, along with other required details like the supplier's GST number. Proper documentation is essential for audits and compliance. For creating compliant records, you can use a professional Tax Invoice template.
Next Step
Use the GST Calculator – Add or Remove 15% GST to handle your tax calculations quickly. For other essential business maths, you might also find our New Zealand PAYE Calculator or New Zealand Salary to Hourly Rate Calculator (with Minimum Wage Check) helpful.
