GST Registration & Filing in New Zealand — Complete Guide 2026
Everything NZ small businesses need to know — from the $60,000 threshold and step-by-step registration process, to filing your first GST return, choosing the right filing period, and avoiding IRD penalties.
GST is one of the biggest ongoing tax obligations for any NZ business. Once your turnover hits $60,000 you legally have 21 days to register — miss that deadline and IRD penalties start immediately. This complete guide covers GST registration and GST filing in New Zealand — who has to register, how the online process works, which filing period to choose, how to file returns correctly, and what happens if you get it wrong. See the official IRD GST guide, or talk to our Auckland team who handle GST for 500+ NZ businesses.
What is GST and How Does it Work in NZ?
GST stands for Goods and Services Tax. In New Zealand it's a flat 15% tax added to the price of most goods and services. When you buy a $5.75 coffee, about 75 cents of that is GST. When a plumber invoices $115 for a job, $15 of it is GST.
When you're GST-registered, you become a collector of GST on behalf of IRD. You charge 15% on your sales, and you can claim back the 15% GST you've paid on your business purchases. Every filing period you compare what you collected vs what you paid — and either pay the difference to IRD, or get a refund if you paid more than you collected.
GST doesn't come out of your business's pocket. You're essentially collecting for IRD. But charging GST without being registered is an offence — and not registering when you should be is also an offence. Getting the registration timing right matters.
Who Must Register for GST in New Zealand?
You must register for GST if your taxable turnover — meaning total revenue from sales of goods and services in NZ — exceeds $60,000 in any 12-month period. The key phrase is "any 12 months" — not just the financial year. IRD measures this on a rolling basis.
You can also register voluntarily if your turnover is under $60,000. This is often a smart move — especially if your clients are mostly GST-registered businesses who can claim your GST back, or if you have significant business expenses you want to get GST refunds on.
The $60,000 Threshold — Three Zones
Who Must Register — Business Types
GST registration applies to every business structure once you hit the threshold:
- Sole traders — your personal trading income counts toward the $60,000 threshold.
- Companies (Ltd) — the company's revenue determines registration, not the director's salary.
- Partnerships and trusts — the entity's total turnover is what matters.
- Non-resident businesses — if selling to NZ customers and turnover exceeds $60,000, you may need to register even without a physical NZ presence.
How to Register for GST — Step by Step
The GST registration process in NZ is done online via myIR — IRD's secure portal. The whole thing takes about 30 minutes if you have your documents ready. Here's the full step-by-step:
Check if You Actually Need to Register
Confirm your situation. Have you earned more than $60,000 in the last 12 months? Or do you reasonably expect to earn more than $60,000 in the next 12 months? Yes to either — you must register. No to both — registration is optional but worth considering.
⏱ 5 minutesGet Your Documents Ready
Gather these before you start the online form: your IRD number (8–9 digits), myIR login, business bank account details, estimated annual turnover, and your business start date and legal entity type.
📋 Have documents readyLog into myIR at ird.govt.nz
Go to ird.govt.nz and click "myIR" in the top right. Log in with your username and password. If you don't have a myIR account yet, click "Create an account" — you'll need your IRD number.
⏱ 5 minutes to log inNavigate to Register for GST
In myIR, click the "I want to..." menu — usually near the top of your account homepage. Select "Register for a tax type". On the next screen, choose "GST" from the list of tax types.
📍 Path: myIR → I want to... → Register for a tax type → GSTFill in the Registration Form
The form asks for: registration start date, reason for registering (mandatory or voluntary), business activity description, ANZSIC industry code, estimated annual turnover, and your bank account for GST refunds.
⏱ 10–15 minutesChoose Your GST Filing Period
Select monthly, two-monthly or six-monthly filing. This is one of the most important decisions in registration. See the next section for how to choose. Two-monthly is the most popular for NZ small businesses.
⚠ Important decisionChoose Your Accounting Basis
Invoice basis — record GST when invoices are issued (most common, required over $2m). Payments basis — record GST only when cash is received (better for slow-paying clients, under $2m only).
📋 Most SMBs use Invoice basisSubmit and Receive Your GST Number
Review everything and click Submit. IRD processes most GST registrations within 3–5 working days. You'll receive confirmation and your GST number through your myIR account. From your registration date, add 15% GST to all invoices.
⏱ 3–5 working days for confirmationWhich GST Filing Period Should You Choose?
Your filing period determines how often you submit GST returns. Each has pros and cons:
- Fast GST refunds
- Smaller GST balances
- Better cash flow
- Higher admin burden
- Balanced admin load
- Good cash flow
- Standard for NZ SMBs
- Refunds 6× per year
- Minimal admin
- Only 2 returns per year
- Cash flow risk
- Larger GST balances
How to File Your GST Return in NZ
Once registered, you file GST returns on your chosen schedule. Every return is due by the 28th of the month following the end of your filing period. Here's how:
Calculate Your GST Collected
Add up all the GST you charged customers during the filing period. If you use Xero or MYOB, this is automatic. Otherwise, list every invoice you issued and total the GST amounts.
Calculate Your GST Claimable
Add up the GST you paid on business purchases. You can only claim GST back on expenses with a valid tax invoice — one showing the supplier's GST number, the GST amount and total.
Work Out What You Owe (or Are Owed)
GST Collected − GST Claimable = Net GST Position. Collected more? You owe IRD. Paid more? You get a refund.
Log into myIR and File
Go to your GST account in myIR. Click the return that's due. Enter total sales, GST collected, total purchases and GST claimable. Submit.
Pay Any GST Owing
Pay through myIR by direct debit, credit card or bank transfer. IRD prefers direct debit — set it up so you never miss a due date. Refunds are paid into your bank account within 5–10 working days.
The Golden Rule — Set GST Aside Every Week
The single biggest mistake NZ small business owners make with GST is spending money that belongs to IRD. Here's the rule that keeps you out of trouble:
Every time you receive payment from a customer, immediately transfer 15% into a separate bank account. That 15% is not your money — it's GST you're holding for IRD. Treat it like it's in escrow. When your GST return is due, the money is already there.
GST Penalties — What Happens If You Get It Wrong?
IRD takes GST compliance seriously. Late registration, late filing and late payment all trigger penalties that stack up quickly. Here's the penalty timeline:
7 Common GST Filing Mistakes NZ Businesses Make
Even businesses that register on time often make mistakes when filing GST returns. Here are the ones we see most often at Elite Taxation:
Claiming GST on Non-Business Expenses
Only business expenses give you a GST refund. Personal groceries, entertainment, holidays — none are claimable. If IRD audits and finds personal expenses claimed, they'll disallow the GST plus penalties.
Missing Valid Tax Invoices
To claim GST back on any purchase over $50, you need a valid tax invoice showing the supplier's GST number. Bank statements alone aren't enough. Missing invoices = disallowed GST claims.
Claiming 100% GST on Mixed-Use Vehicles
If you use your car for both business and personal driving, only claim the business-use percentage of GST on fuel and vehicle expenses. Claiming 100% is one of the most common IRD audit findings for tradies and rideshare drivers.
Wrong GST on Entertainment Expenses
Meals and entertainment with a business purpose are only 50% deductible for income tax — and the GST claim is limited to the same 50%. Many businesses accidentally claim 100% GST on client lunches.
Charging GST When Not Registered
If your invoices show GST but you're not GST-registered, that's a legal issue. Customers who paid GST that wasn't legitimate can complain to IRD. Remove GST from all invoices immediately if you're not registered.
Not Filing a Nil Return
If you had no sales in a filing period, you still need to file a nil return. IRD doesn't accept "there was nothing to file" — missing a nil return triggers a late filing penalty just like a missed return with GST owing.
Filing on the Wrong Basis
If you registered on Invoice basis but calculate your return on Payments basis (or vice versa), IRD will pick it up. Match your calculation method to your registered basis. To switch, apply to IRD — don't just start doing it differently.
Real NZ Examples — GST in Action
Based on real client situations from our Auckland team:
Tom, Builder, Hamilton — $85,000 revenue
Sole trader builder whose revenue hit $85,000 in month 7. He crossed the threshold and has 21 days to register. His clients are homeowners who can't claim GST back — so Tom absorbs the GST or raises prices. He registers two-monthly and adds GST to invoices from his registration date.
✓ Must register — mandatory at $85kSarah, Marketing Consultant, Auckland — $40,000 revenue
Consulting business earning $40,000, but 90% of clients are GST-registered NZ companies. She registers voluntarily — adding 15% GST doesn't make her more expensive to clients (they claim it back), and she now gets GST refunds on her laptop, software and office expenses.
✓ Voluntary registration smart — B2B clientsPriya, New Café Owner, Christchurch — just opened
Opened a café 2 months ago, spent $95,000 on fit-out, equipment and stock — all with GST. Expects to be well over $60,000 in year one. She registers from day one to immediately claim GST refunds on startup costs — around $12,400 in GST back over the first few months.
✓ Register immediately — high startup GSTRaj, Market Stall, Wellington — $28,000, mostly consumers
Handmade products at Wellington markets. Revenue $28,000, all customers are private individuals. If Raj registers voluntarily and adds 15% GST, his products become 15% more expensive and customers don't benefit. He decides to stay unregistered.
⚠ Voluntary registration not worth it — B2C, price-sensitiveWhat to Do After GST Registration
Registration is just the start. Here are the 6 essential things to set up from day one:
- Update all your invoices — add your GST number, show GST separately, state the total including GST. Without these, your client can't claim GST back.
- Open a separate GST bank account — transfer 15% of every payment received into this account immediately.
- Set up Xero or accounting software — Xero tracks GST automatically and lets you file returns in one click direct to IRD.
- Put GST due dates in your calendar — set recurring reminders for every filing period. Missing a due date triggers a penalty even if you owe nothing.
- Keep tax invoices for all business purchases — you need valid invoices to claim GST back on expenses over $50.
- Tell your accountant — give them your GST registration date and filing period so they can set up your books correctly from day one.
