A sole trader invoices in their own legal name or under a registered business name that matches what clients contracted, using their personal Inland Revenue number for income tax and, once GST registered, their GST number on taxable supplies. If you are not registered for GST, you do not add fifteen percent GST to standard-rated domestic supplies, and your document should not pretend to be a GST invoice for taxable activity you cannot support. If you are registered, you charge GST where the supply is taxable at the standard rate, file GST returns on your chosen frequency, and give buyers taxable supply information that meets Inland Revenue tier rules for the dollar value of each supply. Many operators also display a New Zealand Business Number so accounts payable can match your entity in the NZBN register. This guide summarises public IRD and New Zealand Government guidance only and is not tax or legal advice.
At February 2024, Stats NZ reported that seventy-three percent of enterprises in New Zealand did not have any paid employees, which captures the sheer volume of micro businesses where disciplined invoicing protects cash flow (Stats NZ, New Zealand business demography statistics: At February 2024, 2024). Allan Bullot, partner at Deloitte, told RNZ in 2024 that with tools such as Xero and MYOB, doing GST has become much simpler for many firms, which is why compliance debate often focuses on thresholds and behaviour rather than paper titles alone (RNZ, Small businesses restrict sales to avoid GST, 2024).
Context
Sole trading is a business structure where you keep trading income inside your personal IRD obligations, while GST registration adds parallel reporting whenever turnover or pricing choices trigger the rules. The points below join identity, GST timing, and document content into one checklist.
IRD explains that self-employment includes contracting, working as a sole trader, and small business owners, and that you use your individual IRD number to pay tax on net profit through an individual income return (Inland Revenue, Self-employed, last updated 16 Jul 2024). Your invoice should therefore carry contact details and trading labels that match how you registered those obligations.
IRD states you must register if you are an entity and either you carry out a taxable activity and your turnover was at least sixty thousand dollars in the last twelve months or you expect it will be at least sixty thousand dollars in the next twelve months, or you carry out a taxable activity and add GST to the prices of goods or services you sell (Inland Revenue, Registering for GST, last updated 13 Feb 2025). Voluntary registration below the threshold remains possible when IRD accepts your taxable activity story.
IRD explains that new laws replaced the requirement to use tax invoices with taxable supply information, but compliant invoicing practices under the old rules still comply, and you may continue to provide taxable supply information in one document marked as a tax invoice (Inland Revenue, Taxable supply information for GST, last updated 27 Nov 2024). Tiered dollar rules still decide how much buyer detail you show.
business.govt.nz describes the NZBN as a unique identifier businesses use when interacting with government agencies and each other, helping speed up business processes (business.govt.nz, New Zealand Business Number, accessed 2026). Showing your NZBN beside your trading name helps corporate payers confirm they are paying the entity they onboarded.
IRD states it is important you keep accurate and complete records of your income and expenses for seven years, and lists taxable supply information among examples alongside bank statements and invoices (Inland Revenue, Records of income and expenses, last updated 1 Apr 2023). Cloud folders labelled by financial year and GST period beat inbox searches when Inland Revenue or a buyer disputes a supply.
Sources
These points come from Inland Revenue and Stats NZ releases. They anchor templates in facts rather than offshore blog defaults.
IRD states you must register for GST when you are an entity and either your taxable activity turnover crosses the sixty thousand dollar twelve-month tests or you add GST to prices before formal registration (Inland Revenue, Registering for GST).
Inland Revenue, Registering for GST (2025). View source
Stats NZ reported that at February 2024 seventy-three percent of enterprises in New Zealand did not have any paid employees, illustrating how many micro enterprises rely on clean payment documentation (Stats NZ, New Zealand business demography statistics: At February 2024, 2024).
Stats NZ, New Zealand business demography statistics: At February 2024 (2024). View source
Workflow
Confirm identity and registrations, choose GST status honestly, match document labels to that status, then archive evidence for seven years.
Use the same trading label on contracts, quotes, and invoices. Add IRD contact updates through myIR when details change, and note your NZBN in the header when you have one so buyers can reconcile vendor master data (business.govt.nz, New Zealand Business Number).
Compare actual and expected turnover monthly against IRD registration triggers before you quote GST-inclusive prices on domestic taxable work (Inland Revenue, Registering for GST).
If you are not GST registered, avoid GST line items and phrases that imply you collected GST. Once registered, issue taxable supply information that satisfies IRD tier rules for each supply value, still using the words tax invoice if that fits your workflow (Inland Revenue, Taxable supply information for GST; Inland Revenue, How taxable supply information for GST works, last updated 31 Mar 2026).
Follow Invoice Mama's New Zealand tax invoice guide for tiered fields, including buyer identifiers above one thousand dollars and the twenty-eight day response expectation for GST-registered buyers on supplies over two hundred dollars (Inland Revenue, How taxable supply information for GST works).
State whether totals are GST inclusive or exclusive, specify bank details or payment links, and repeat purchase order or reference metadata corporate payables require.
Reconcile Box totals to underlying invoices, meet filing frequency deadlines, and retain issued and received documents for seven years as IRD describes for income and expense records (Inland Revenue, Records of income and expenses).
Checklists
Use this list right before delivery. It joins IRD identity habits with taxable supply information expectations.
Pitfalls
The expensive habits are charging GST without registration, omitting buyer identifiers on large taxable supplies, and throwing away evidence before seven years.
Problem
IRD ties lawful GST collection to registration status and taxable supplies. Charging GST early can create rework with buyers and registration backdating questions (Inland Revenue, Registering for GST).
Fix
Issue non-GST invoices until your effective registered date is clear, then reissue corrected taxable supply information if quotes shifted.
Problem
IRD requires buyer name or trade name, GST number, and identifier detail for supplies over one thousand dollars to GST-registered buyers, otherwise their GST credit evidence fails (Inland Revenue, How taxable supply information for GST works).
Fix
Add validated GST numbers and one identifier field such as email or NZBN before you email milestone invoices.
Problem
IRD expects readable records that support income tax and GST returns; blurred bank feeds slow audits and buyer refunds (Inland Revenue, Records of income and expenses).
Fix
Run a dedicated business account, attach remittance advice to each deposit, and reconcile weekly.
Problem
Australian dollar thresholds, agency names, and BAS wording differ from IRD taxable supply tiers, so copied templates mis-label GST stories.
Fix
Pair this page with Invoice Mama's Australian sole trader guide only when you genuinely trade both sides of the Tasman, not as a default template.
Sole traders who invoice New Zealand clients, councils, and platforms, and need paperwork accepted on first pass.
Buyers expect identifiers they can audit. Many sole traders show IRD numbers when buyers request them for onboarding, while GST registration adds GST numbers for taxable supplies. Confirm exact fields with your accountant because engagements differ for offshore clients.
IRD taxable supply tiers focus on GST numbers and descriptive fields rather than mandating NZBN on every document, yet enterprise procurements increasingly expect NZBN data for vendor matching (business.govt.nz, New Zealand Business Number). Treat NZBN as best practice when you have one.
Yes when the trading name is registered on the Companies Office New Zealand business registers site and matches how you bank and contract. Misaligned names trigger fraud holds.
IRD explains that for supplies over two hundred dollars you must provide taxable supply information within twenty-eight days of a request unless another date is agreed (Inland Revenue, How taxable supply information for GST works, last updated 31 Mar 2026).
Standard-rated domestic supplies usually carry fifteen percent GST, yet zero-rated exports and exempt supplies follow different rules. Apply IRD GST basics guidance line by line.
IRD ties self-employed results to personal income tax returns and provisional tax schedules, using the same underlying invoices that support GST if you are registered (Inland Revenue, Self-employed).
Yes. Mirror the dollar presentation IRD expects for your tier, whether you show GST as separate lines or state that totals include GST at the standard rate for every listed item.
Open Invoice Mama's guides on what to include on a New Zealand tax invoice and taxable supply information, then compare Australian GST registration guidance only if you also bill Australian clients.
Keep learning
Layer IRD registration guidance with field-by-field taxable supply rules, then add payment follow-up habits.
Sixty thousand dollar turnover tests, taxable activity, myIR steps, and obligations once GST begins.
Read guideTiered taxable supply fields, GST numbers, buyer identifiers, and twenty-eight day requests.
Read guideSchedular payments, IR330C withholding rates, purchase order alignment, and GST-registered milestones.
Read guideHow April 2023 rules combine invoices, contracts, and buyer-created records.
Read guideABN, seventy-five thousand dollar GST threshold, BAS habits, and five year records when you compare structures.
Read guideReminder cadence, documentation, and escalation patterns once invoices age.
Read guideFrom first bill to GST return
Invoice Mama helps you issue branded invoices, keep sequential numbering, and show payment terms while you move between non-GST bills, GST-registered taxable supply information, and IRD record keeping.