Sales Tax (GST) Calculator

Simple Math, Serious Implications In New Zealand, GST (Goods and Services Tax) is 15%. It sounds simple, but calculating it backwards (removing GST from a total) or applying it to complex totals often leads to rounding errors that annoy your accountant—and the IRD.

Use this tool to:

• Add GST (Exclusive to Inclusive): You have a net price (e.g., $100) and need to know the total to bill the client ($115).
• Remove GST (Inclusive to Exclusive): You bought something for $115 and need to know the pre-tax cost for your books ($100).
• Check Invoices: Verify that a supplier has charged you the correct amount before you pay.

How to use it:

• Download: Click the button above to get the Google Sheet.
• Enter Amount: Type in your base figure.
• Toggle: Select whether you want to Add GST (15%) or Extract GST.
• Result: Get the exact figures for your Xero reconciliation immediately.

FAQs

• Q: What is the current GST rate in New Zealand? A: The current GST rate in New Zealand is 15%. This applies to most goods and services sold in NZ.
• Q: How do I calculate GST manually? A: To add GST, multiply your figure by 1.15. To remove GST from a total, divide the figure by 1.15. However, using a calculator ensures you don’t make rounding errors on the cents!
• Q: Can I use this for my GST return? A: This tool helps you calculate individual transaction amounts correctly. For your actual GST return filing, you should use accounting software like Xero or MYOB, or consult with a tax agent or accountant to ensure compliance.

Need more than just a calculator? Getting the math right is step one. Getting the strategy right is step two.

If you need help understanding how your tax obligations affect your cash flow, let’s have a chat. As a Virtual CFO, I help business owners navigate the numbers with confidence.