On each invoice you need to include:
- your business name
- your customer’s name and address
- the invoice number, date sent and due date
- a description of the goods or services provided, eg date, quantity, rate and hours
- the amount payable
- payment details
If you’re GST registered, you must also include:
- your GST number
- the words “tax invoice” in a prominent place
Business.govt.nz offer a free invoice template, you can download here.