Basics
What is GST in New Zealand?
Who charges GST, who has to register, and what the 15% rate applies to.
More Info & Guides
Longer explanations for the times a calculator is not the whole answer, from GST basics to spreadsheet formulas.
GST guides
Method
How to calculate GST by hand
The arithmetic behind adding GST, removing GST and working back from a GST amount.
Spreadsheets
How to calculate GST in Excel
Build GST-inclusive, exclusive and component columns that hold up across a whole price list.
Articles
Spreadsheets
How to calculate GST in Google Sheets
The same formulas for Sheets, including how to apply them down a column.
Google Ads
Does Google Ads charge GST in NZ?
How GST applies to Google Ads invoices for New Zealand businesses, including setting up your GST number and claiming GST back on ad spend.
Facebook Ads
Does Facebook charge GST on ads in NZ?
How GST applies to Facebook Ads invoices for New Zealand businesses, including setting up your GST number and claiming GST back on ad spend.
LinkedIn Ads
Does LinkedIn Ads charge GST in NZ?
How GST applies to LinkedIn Ads invoices for New Zealand businesses, including adding your GST number and claiming GST back on ad spend.