How to invoice as a sole trader in New Zealand

Being a sole trader in New Zealand is refreshingly simple on paper — there's no separate legal entity, no company registration, no annual return to the Companies Office. You just start trading under your own IRD number (or a trading name) and invoice people. The catch is that "simple" doesn't mean "no rules." A handful of small details separate an invoice that gets paid in a week from one that sits in someone's inbox while their accounts team asks you to resend it properly.

What makes a sole trader different from a company, invoice-wise

As a sole trader, you and the business are the same legal person. That has two practical effects on your invoices:

• You invoice under your own legal name (a trading name is fine too, as long as it's clear who's actually responsible), not a company number.
• Any profit is taxed as your personal income, so keeping clean, numbered invoices matters at tax time — not just for the client's sake but for yours.

None of this changes what an invoice needs to contain. It just means there's no "Ltd" or NZBN to add unless you've registered for one voluntarily.

Do you need to register for GST first?

This is the question almost every new sole trader asks, and the honest answer is: it depends on your turnover, and the threshold does move over time, so treat this as a starting point rather than gospel. As a rule of thumb, once your turnover looks like it will pass roughly $60,000 in a 12-month period, you're required to register for GST with Inland Revenue. Below that, registration is optional — some sole traders register early anyway because it lets them claim GST back on tools, materials or a work vehicle, others wait until they have to.

Check the current threshold and your own situation with your accountant or on the IRD website before deciding — this isn't tax advice, just the shape of the rule.

If you're not registered, don't put GST on your invoices at all. If a client asks, it's fine to simply say you're not GST registered.

What has to be on a sole trader invoice in NZ

Whether or not you're GST registered, a solid invoice needs:

1. The word "Invoice" at the top, so accounting software and inboxes recognise it.
2. A unique, sequential invoice number — INV-0001, INV-0002, and so on. Never reuse a number.
3. Your name or trading name, contact details, and your GST number if you're registered.
4. The client's name and address.
5. The date issued and a real due date ("Due 2 October 2026", not "14 days").
6. A clear description of the work or goods, with quantity and price.
7. The total, and if you're GST registered, the GST amount shown separately from the subtotal.
8. How to pay — your bank account number, and a note like "please use INV-0042 as the reference."

If you're GST registered and the invoice totals over $1,000, Inland Revenue expects the words "Tax Invoice" to appear on it, along with your GST number and the tax clearly broken out. Most invoicing tools add this automatically once you flag yourself as GST registered — worth checking with your accountant that yours does.

Invoice numbering that keeps your accountant happy

Pick a format and stick to it for the life of the business — something like INV-0001 that increments by one, in order, with no gaps and no reused numbers. Skipping numbers or reusing one after a cancelled invoice looks messy in an IRD audit and makes end-of-year reconciliation slower than it needs to be. If you cancel an invoice, issue a credit note against it rather than deleting it — the paper trail matters more than tidiness.

Getting paid faster as a New Zealand sole trader

The invoice itself does a lot of the work if you get a few things right:

• Send it the day you finish the job. A same-day invoice gets paid sooner than one that waits for "invoicing day" on Friday.
• Use a real due date, not "net 14." People respond to a date on a calendar far better than they respond to maths.
• Offer a way to pay online. Bank transfer is normal in NZ, but adding a Pay now option (card, Apple Pay, Google Pay) removes the "I'll do it later" excuse — as a rule of thumb, invoices with a one-tap payment option tend to get settled noticeably faster than bank-transfer-only ones.
• Let reminders do the nagging. A friendly automatic reminder on the due date and a firmer one a week later saves you from sending awkward "just checking in" texts yourself.
• Ask for a deposit on bigger jobs. For anything substantial, 30–50% upfront is common practice for NZ sole traders in trades and creative work, and it protects you if a job stalls halfway through.

If a client disputes an amount, resolve it in writing before the due date rather than letting the invoice sit unpaid in the meantime — a quick credit note or an agreed adjustment keeps the relationship (and your cash flow) intact.

Template, spreadsheet, or a proper tool?

A Word or Excel template is a perfectly fine way to send your first few invoices — it costs nothing and takes ten minutes to set up. Where it starts to cost you time is numbering (easy to duplicate by accident), tracking who's actually paid, and remembering to chase the ones who haven't. Once you're sending more than a handful a month, that admin adds up.

That's the gap InvoiceCharlie is built to close for sole traders: correct invoice numbering, GST handled automatically once you turn it on, a Pay now button, and reminders that go out without you lifting a finger. You can create a proper GST-ready invoice for free right now with no account needed, and when you're ready for numbering, reminders and online payment, your first 10 invoices are free.