You must register for GST with Inland Revenue when you are an entity, you carry out a taxable activity, and either 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 price of goods or services you sell (Inland Revenue, Registering for GST, last updated 13 Feb 2025).
You do not have to register simply because you started a business. Voluntary registration below the threshold is still possible when you have a taxable activity and IRD accepts your application. After registration you choose filing frequency and accounting basis, charge GST on taxable supplies, lodge GST returns, pay or receive net GST, and keep readable records (Inland Revenue, Registering for GST).
This guide summarises public IRD guidance and is not tax or legal advice. Confirm your facts with Inland Revenue or a New Zealand tax adviser.
Context
Registration fixes when you may lawfully charge fifteen percent GST on standard-rated supplies, while taxable supply information rules fix what buyers need on documents. The points below tie IRD registration guidance to invoicing habits used by New Zealand contractors and small businesses.
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).
IRD explains that you do not have to register for GST just because you start a business or organisation. The threshold and taxable activity tests decide timing (Inland Revenue, Registering for GST).
IRD lists obligations including charging GST to customers, filing GST returns, paying GST you owe, and keeping GST records. When you file, you work out the difference between GST collected and GST paid on purchases related to your taxable activity (Inland Revenue, Registering for GST).
IRD states that in exceptional circumstances it may backdate your GST registration start date, and suggests contacting IRD if you have been adding GST to prices but are not yet registered or if another reason applies (Inland Revenue, Registering for GST).
Australian law uses different dollar thresholds and agency names. If you also trade across the Tasman, read Invoice Mama's Australian GST registration guide beside this page so you do not mix up turnover tests or invoice labels.
Sources
These points come from Inland Revenue's registering for GST guidance. They explain why turnover tests and the decision to add GST to prices belong in one operational checklist.
Inland Revenue states that 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).
Inland Revenue, Registering for GST (2025). View source
IRD explains that once registered for GST you need to charge GST to customers, file GST returns, pay any GST you owe, and keep GST records (Inland Revenue, Registering for GST).
Inland Revenue, Registering for GST (2025). View source
Workflow
Work through taxable activity, turnover, IRD application, filing choices, first GST-inclusive prices, compliant documents, and return discipline in order. If a step is unclear, pause and get advice before you tell customers a final GST-inclusive price.
IRD ties registration to entities carrying out a taxable activity. Read IRD's definitions and examples for your sector before you assume registration is optional or compulsory (Inland Revenue, Registering for GST).
Compare your results with IRD's sixty thousand dollar tests for past and expected turnover. Update projections when large contracts or seasonal peaks change your outlook (Inland Revenue, Registering for GST).
Complete Inland Revenue's online registration pathway for your entity type. Keep copies of confirmations and your intended filing frequency and accounting basis selections (Inland Revenue, Registering for GST).
Tip: IRD links dedicated guidance on choosing accounting basis and filing frequency from the same registering hub.
Update quotes and invoices so fifteen percent GST appears only when the law allows for your supplies and your registration status. Align trading names and identifiers with what IRD holds on record.
Follow Invoice Mama's New Zealand tax invoice checklist so buyer identity fields, GST numbers, and dollar columns match Inland Revenue's taxable supply information rules for your supply values.
Report GST collected less GST paid for each taxable period, pay net GST by the due date, and store invoices and supporting records in readable form for the statutory retention period.
Checklists
Use these lists as a final check before you apply and after each taxable period when you reconcile GST figures.
Pitfalls
Most issues come from charging GST before IRD confirms registration, ignoring projected turnover after a quiet quarter, or mixing up invoice fields after GST starts.
Problem
GST on customer invoices must align with your lawful registration status and supply rules. Early GST can create rework with buyers and IRD.
Fix
Keep pre-registration quotes GST-exclusive where appropriate, then reissue documents that meet taxable supply information rules from your effective registration date.
Problem
IRD tests both historical turnover and whether you expect sixty thousand dollars or more in the next twelve months (Inland Revenue, Registering for GST).
Fix
Update a simple rolling forecast when you sign large contracts or enter busy seasons.
Problem
IRD notes exceptional backdating is possible but encourages contact when GST was charged without registration (Inland Revenue, Registering for GST).
Fix
Pause GST-inclusive marketing until you complete IRD registration or seek advice on corrections.
Problem
Once registered, IRD's taxable supply information tiers still control which buyer identifiers you show above key dollar thresholds.
Fix
Pair this guide with Invoice Mama's New Zealand tax invoice checklist before you email PDFs.
Plain-language answers for New Zealand sole traders, companies, and charities reviewing GST registration.
No. Inland Revenue states that you do not have to register for GST just because you start a business or organisation. You must register when the law requires it based on taxable activity, turnover, or adding GST to prices (Inland Revenue, Registering for GST).
IRD explains that you must register when 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, subject to the full tests on its registering page (Inland Revenue, Registering for GST).
If you are below the compulsory threshold and do not add GST to prices, you usually stay unregistered until tests change. If you carry out a taxable activity, Inland Revenue also operates voluntary registration pathways with rules about how long you stay registered and when you can claim GST on expenses. Read IRD's current voluntary registration pages before you commit because cash-flow and credit rules shift once you file returns.
Yes. IRD states you must register if you carry out a taxable activity and add GST to the prices of goods or services you sell, even if turnover sits below sixty thousand dollars (Inland Revenue, Registering for GST).
Complete GST registration through Inland Revenue's digital services, normally myIR, using the pathway IRD publishes for your entity type. Keep confirmation emails or letters with your effective registration date.
Most taxable supplies use the fifteen percent standard rate. Zero-rated and exempt supplies follow different rules. Show each line correctly so buyers can support their GST returns.
IRD explains that when you register you choose how often you file GST returns and how you record GST, referring you to guidance on filing frequency and accounting basis (Inland Revenue, Registering for GST).
Yes. Invoice Mama supports branded invoices with consistent GST treatment and numbering while you meet IRD record keeping expectations.
IRD states it may backdate registration in exceptional circumstances and invites contact if you added GST but were not registered (Inland Revenue, Registering for GST). Seek urgent advice because buyer credits can be at stake.
Invoice Mama publishes Australian GST registration and invoicing guidance at /guides/au/gst-registration-invoicing with ATO thresholds and tax invoice habits.
Keep learning
New Zealand invoicing rules plus Tasman and global guides when you compare thresholds.
Taxable supply information tiers, GST numbers, buyer identifiers, and twenty-eight day requests.
Read guideHow the 1 April 2023 vocabulary, flexible evidence, buyer requests, and buyer-created rules fit around registration.
Read guideATO thresholds, twenty-one day registration habits, and BAS context next to IRD rules.
Read guideReminder cadence and documentation when balances sit past due.
Read guideLine items, job references, and payment terms that keep projects organised.
Read guideFrom IRD registration to GST invoices
Invoice Mama helps you send branded invoices with consistent GST lines, payment details, and numbering while you register with IRD and file GST returns.