NZBN Invoice Rules NZ (2026–27): Taxable Supply Information & Tradie Docket Books

Short answer: An NZBN invoice in New Zealand displays your 13-digit New Zealand Business Number alongside your legal or trading name, date, itemised description, and payment details. While Inland Revenue requires your 8- or 9-digit IRD/GST number on GST Taxable Supply Information over $200, adding your NZBN satisfies IRD’s buyer-identification rule on B2B invoices over $1,000 and is mandatory when invoicing New Zealand government agencies and many commercial head contractors.

⚡ Instant NZBN & 15% GST Taxable Supply Information Invoice Maker ($NZD): Generate a compliant NZBN invoice, quote, or customer receipt in the interactive tool above, export a 🔗 Embed / CSV Template, save 5 Free Saves in iCloud Web Workspace at /keel/workspace/, or Download Keel on the App Store (Australia & NZ Sole Traders CPP) (AU & NZ Sole Traders Overview) to replace paper carbon docket books with an on-device quote maker, NZBN invoice app, and receipt maker.

Across New Zealand, sole-trader builders, sparkies, plumbers,drainlayers, and independent contractors frequently get asked by commercial clients or property managers to send an nzbn invoice—while older suppliers still hand over carbon-copy slips torn from a paper docket book.

Understanding the difference between your 13-digit NZBN and your 8- or 9-digit IRD / GST number, and knowing how both fit into Inland Revenue’s Taxable Supply Information (TSI) rules for the 2026–27 tax year, prevents held-up progress payments and disallowed 15% GST credits.

What is the difference between an NZBN and a GST number on a New Zealand invoice?

Many first-year sole traders confuse their NZBN with their GST number (which for a sole trader is usually the same as your personal 8- or 9-digit IRD number). They come from two different government agencies and serve two different legal purposes on an invoice:

Identifier on a Kiwi Invoice	Format & Issuing Agency	Who Can Get One?	Legal Role on a New Zealand Invoice
NZBN (New Zealand Business Number)	13-digit number (e.g., 9429000000000) issued free by MBIE at nzbn.govt.nz	Any NZ sole trader, partnership, trust, or company in business (even under $60k turnover)	Uniquely identifies your business to commercial buyers, government agencies, trade accounts, and eInvoicing systems; counts as an official IRD buyer identifier on B2B sales over $1,000
GST Number (IRD Number)	8- or 9-digit number (e.g., 123-456-789) issued by Inland Revenue (IRD)	Only businesses registered for 15% GST (mandatory at $60,000 annual turnover)	Mandatory seller identifier on all GST Taxable Supply Information over $200 (incl. GST)

For a full walkthrough of GST number formatting, see GST number NZ and how to invoice as a contractor in NZ.

When is an NZBN required or expected on a New Zealand invoice?

1. Invoicing NZ central and local government agencies: Cabinet mandates require New Zealand central government agencies (and most councils, schools, and crown entities) to use the NZBN in procurement and invoicing. Putting your 13-digit NZBN in the header of your invoice prevents accounts-payable delays.
2. Satisfying IRD’s $1,000+ Taxable Supply Information buyer-identity rule: Under Inland Revenue’s GST rules, when a GST-registered sole trader issues an invoice over $1,000 (including GST) to another GST-registered business, the invoice must record the buyer’s name plus at least one official identifier—which IRD defines as the buyer’s physical/postal address, phone number, email address, trading name, website URL, or their 13-digit NZBN.
3. Opening trade accounts at Mitre 10, PlaceMakers, Bunnings, or Reece: Trade suppliers use your NZBN to verify that you are a genuine sole trader in business before granting trade pricing and 20th-of-the-month credit terms.
4. Proving you are in business when you are under the $60,000 GST threshold: If your turnover is under $60,000 and you are not registered for GST, you cannot display a GST number on your invoice. Displaying your 13-digit NZBN alongside “Not GST registered — no GST charged” shows commercial clients that you are a verified business entity without charging 15% GST.

What must an NZBN GST invoice show at each IRD dollar threshold?

Whether you create your invoice in a mobile tradie invoice app, a spreadsheet, or a browser generator, Inland Revenue’s Taxable Supply Information rules divide New Zealand invoices into three tiers:

Invoice Value (Incl. 15% GST)	Seller Details Required	Buyer Details Required	GST & Pricing Breakdown Required
$200 or less	Name/trading name (NZBN optional)	None mandatory (keep your own sale record)	Total amount paid
Over $200 up to $1,000	Name/trading name + 8/9-digit GST number (plus 13-digit NZBN for commercial best practice)	Buyer name recommended	Invoice date, description of goods/services, and either (a) Subtotal excl. GST + 15% GST + Total incl. GST, or (b) Total incl. GST with “Includes 15% GST”
Over $1,000	Name/trading name + 8/9-digit GST number + 13-digit NZBN	Buyer’s name + at least 1 identifier (Buyer’s NZBN, address, email, phone, or trading name)	Invoice date, itemised quantities & descriptions, Subtotal excl. GST, 15% GST amount, and Total incl. GST

If you want a ready-to-copy layout for both GST-registered and non-GST sole traders, use our NZ invoice template, NZ quote template, and our statutory guide to Taxable Supply Information NZ GST rules & Supply Correction Information (credit notes).

Can Kiwi tradies still use a paper carbon docket book or receipt book?

Walk into any stationery shop in Auckland, Christchurch, or Wellington and you will still see duplicate carbon docket books (“Invoice / Statement” pads and cash receipt books). Legally, Inland Revenue does not ban handwritten dockets—since moving from strict “Tax Invoices” to Taxable Supply Information (TSI), IRD focuses on whether the required data fields exist, not whether they were written on carbon paper or generated as a PDF.

However, relying on a paper docket book creates four serious headaches for a working tradie:

1. The 3/23 GST rounding trap on site: Working out 15% GST (× 0.15 to add, or × 3 ÷ 23 to extract from a GST-inclusive quote) by hand on the bonnet of your ute leads to arithmetic mistakes that cause commercial accounts teams to reject the claim. See how to calculate GST in NZ.
2. Re-writing accepted quotes into invoices: If you write a job price in a quote pad, you have to rewrite every single labour and material line into your invoice docket book when the job finishes—whereas a mobile quote maker and estimate maker converts the accepted quote into an NZBN invoice in one tap.
3. Faded thermal supplier dockets ($200 TSI rule): To claim 15% GST back on your 2-monthly or 6-monthly GST return (Box 12), you must hold valid Taxable Supply Information for every purchase over $200 (incl. GST) and keep it readable for 7 tax years. Thermal paper dockets from hardware stores fade within months unless photographed with an on-device receipt maker and docket scanner. See NZ IRD 7-year record keeping rules.
4. Lost unpaid dockets: A carbon docket book cannot automatically flag which client is 14 days overdue or link your IRD $1.20/km petrol or $1.30/km diesel ute kilometres to the job.

How do you set up an NZBN invoice, quote maker, and docket workflow on iPhone?

Replacing a paper docket book takes less than five minutes:

1. Look up or register your free NZBN: If you already trade as a sole trader in New Zealand, apply free at nzbn.govt.nz using your RealMe login and IRD number.
2. Add your NZBN and GST number to your invoice header: Put both your 13-digit NZBN and (if registered over $60,000) your GST number in your business profile so they print automatically on every quote, invoice, and payment receipt PDF.
3. Use one job flow from quote to docket to invoice: Write the estimate or quote on site, snap supplier dockets under that job as you buy materials, and tap once to convert the accepted quote into a numbered NZBN Tax Invoice. Compare mobile apps in our NZ invoice and quote apps checklist.

Frequently asked questions

What is an NZBN and do New Zealand sole traders need one?

An NZBN (New Zealand Business Number) is a globally unique 13-digit identifier (for example, 9429000000000) issued free of charge by the Ministry of Business, Innovation and Employment (MBIE) at nzbn.govt.nz to any New Zealand sole trader, partnership, trust, or company in business. While private household invoices under $200 do not require an NZBN, having an NZBN is essential for sole traders who open trade accounts (at Mitre 10, PlaceMakers, Bunnings, or Reece), invoice government agencies or commercial head contractors, or issue B2B GST Taxable Supply Information over $1,000.

Is an NZBN compulsory on invoices in New Zealand?

An NZBN is not compulsory for every private household sale under Inland Revenue’s general GST rules, where your 8- or 9-digit GST number is the primary tax identifier on sales over $200. However, displaying your 13-digit NZBN is mandatory when billing New Zealand central government agencies, is required by many commercial head contractors, and counts as an official IRD identifier on B2B sales over $1,000.

How does a sole trader get an NZBN in New Zealand, and is it free?

Yes, getting a New Zealand Business Number (NZBN) is 100% free for sole traders, partnerships, trusts, and companies. You apply online at nzbn.govt.nz using a verified RealMe login and your personal IRD number, confirm your trading name and business contact preferences, and your 13-digit NZBN is usually issued within minutes.

Can I put my NZBN on my invoice if I am not registered for GST?

Yes, and doing so is a smart practice for sole traders earning under the $60,000 GST registration threshold. Putting your 13-digit NZBN on a non-GST invoice alongside the note “Not GST registered — no GST charged” proves to commercial clients that you are a legitimate business without charging 15% GST.

Does Inland Revenue accept digital docket photos instead of keeping paper docket books?

Yes. Under Inland Revenue’s record-keeping guidelines, electronic copies and smartphone photos of paper receipts and dockets are legally valid for the 7-year retention period, provided they clearly capture all required Taxable Supply Information (supplier name, GST number, date, description, and GST/total) and remain readable and accessible in New Zealand.

What is the difference between a quote maker, an estimate maker, and an NZBN invoice app?

In New Zealand consumer law, a quote is a legally binding fixed price for an agreed scope of work, whereas an estimate is an educated best guess (usually expected to land within 10–15% of the final bill). An all-in-one tradie app acts as a quote maker, estimate maker, receipt maker, and NZBN invoice generator so you can create either document on site and convert it into a GST-compliant invoice without retyping.

Do I need to show the buyer’s NZBN on invoices over $1,000 in New Zealand?

For taxable supplies over $1,000 (including GST) made to another GST-registered business, Inland Revenue requires the buyer’s name plus at least one additional buyer identifier. That identifier can be the buyer’s 13-digit NZBN, or their physical/postal address, email address, phone number, trading name, or website URL.

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This article is general information, not tax or legal advice. Check your obligations with Inland Revenue (ird.govt.nz), MBIE (nzbn.govt.nz), or a New Zealand chartered accountant.