Small things New Zealand service businesses need often enough to be annoying. No sign-up, no email, nothing stored.
Add GST to a price, or work out the GST already inside a GST-inclusive total, at New Zealand's 15 per cent.
OpenWhat Inland Revenue asks an invoice to show, in its three bands: up to NZ$200, over NZ$200, and over NZ$1,000. Tick them off against a real invoice.
OpenGeneral information only. Not tax advice, and it does not account for your circumstances - check anything that matters with your accountant or Inland Revenue.