GST vs PAYE for Self-Employed Kiwis: A No-Jargon 2026 Guide

Going self-employed in NZ — even part-time — drops you into a tax world most Kiwis never see. PAYE was simple: employer handled it, you got the net amount, IRD sorted itself. The day you start invoicing your own clients, two new acronyms show up: GST and provisional tax — and one familiar one (PAYE) suddenly doesn't apply to you the same way.

Here's the honest 2026 explainer, written for someone who's just registered for IRD as a sole trader and isn't sure what they owe, when, or how much to put aside.

The short version

The single most useful habit: as money lands, set aside roughly 30-35% in a separate account. That covers income tax + ACC + GST for most sole traders earning under $100k. Don't think of that money as yours.

PAYE vs self-employed: what actually changes

PAYE (Pay As You Earn) is the system that runs when you're an employee. Your employer:

• Calculates income tax based on your tax code (M, M SL, ME, etc.)
• Deducts it before paying you
• Sends it to IRD on your behalf
• Deducts ACC earner's levy too (currently 1.6% of wages)

You get the net amount. You barely think about it.

Self-employed flips this:

• The full gross amount lands in your account
• You're responsible for setting aside income tax
• You're responsible for ACC (CoverPlus levy, separately invoiced annually)
• You're responsible for GST if you cross $60k turnover
• You file an IR3 at the end of the tax year (31 March) to reconcile

Nobody warns you. The first year usually involves a panicky IRD letter asking for $11,000.

GST in plain English

GST is Goods and Services Tax — 15% added to most things sold in NZ. As a self-employed Kiwi, GST works in two directions:

1. You charge GST on your invoices (when registered).
2. You claim GST back on business expenses.

What you pay IRD is the difference.

Do you have to register?

You must register if either is true:

• Your turnover in the past 12 months is over $60,000, or
• Your turnover in the next 12 months will likely exceed $60,000.

You can register voluntarily under $60k — sometimes worth it if you spend heavily on GST-able business inputs (you'd get more back than you'd hand over). For most low-input side hustles (writing, design, consulting), staying unregistered under $60k is simpler.

Filing frequency

• Under $500k turnover: choose 2-monthly or 6-monthly filing
• $500k-$24M: 2-monthly (default) or 1-monthly
• Most side hustles pick 6-monthly to reduce admin friction

How to think about it

Every invoice you send is split into two: the actual fee + 15% GST. The GST portion isn't yours — it's IRD's, parked in your account temporarily. Treat it that way and the 6-monthly bill doesn't sting.

Provisional tax explained

Once you owe more than $5,000 in residual income tax in a year (after PAYE, after rebates), IRD assumes you'll owe a similar amount next year and asks you to pay it in advance — in 3 instalments through the year. This is provisional tax.

Three instalment dates for most filers (year ending 31 March):

• 28 August (instalment 1)
• 15 January (instalment 2)
• 7 May (instalment 3, after year-end)

Calculation methods

• Standard method (default): Last year's tax bill + 5% uplift, split into 3.
• Estimation: You estimate this year's tax yourself (risky — under-estimate by too much and you get charged use-of-money interest).
• Accounting Income Method (AIM): Pay-as-you-go through your accounting software (Xero, MYOB) — handy if your income is lumpy.

For most side hustlers, the standard method is fine. It overshoots in growth years and gets refunded; undershoots in slowdown years and you top up at year-end.

ACC: the easily-forgotten levy

If you're self-employed, ACC sends you an invoice every August or so. It's based on your prior year's income (from your IR3) and currently runs around 1.21%–1.92% of earnings depending on your industry classification, plus the ACC earner's levy at 1.6%.

Round figure: set aside ~3% of self-employed earnings for ACC. It's not optional. It's not bundled with income tax. If you don't pay, you don't get cover.

What about a side hustle while on PAYE?

Very common in NZ. You've got a salaried job and you Uber on weekends, freelance after hours, or sell on Etsy. Here's how the maths works:

1. Your employer handles PAYE on your salary as normal.
2. Your side hustle income is taxed at your marginal rate (33% for most middle-earners by the time the side hustle stacks on top).
3. You file an IR3 at year-end declaring side-hustle income, expenses, and the net.
4. IRD calculates the extra tax owed and asks you to pay it (or refunds you if you've overpaid).
5. If your side-hustle profit pushes total tax owing past $5k, you also fall into provisional tax the following year.

Practical rule: set aside 33% of every side-hustle dollar (or 35% if you're over the $78k threshold). Bigger than you'd think — but smaller than the year-end shock if you don't. See tax codes for side hustles for the detailed code-by-code breakdown.

The "set aside" account: your single best move

The biggest mistake new self-employed Kiwis make isn't on the tax form. It's not setting aside tax money in the first place.

The system:

1. Open a separate on-call savings account labelled "Tax + GST".
2. Every time a client pays you, immediately move:

- 30% if not GST-registered, no other income - 15% for GST + 20% for income tax + ACC if GST-registered

1. Don't touch it. Treat the balance as not yours.
2. Pay GST out of it (when invoiced). Pay provisional tax out of it. Pay year-end IR3 top-up out of it.

When the year settles, any surplus is real take-home. Most sole traders find they've over-set-aside by 2-5% — which is a much better problem than the alternative.

What you can claim as business expenses

The general rule: expenses incurred to earn business income are deductible. Common ones for NZ sole traders:

• Home office (proportion of rent/mortgage interest, power, internet — based on m² used)
• Vehicle (logbook method or kilometre rate)
• Phone (work-use proportion)
• Software, subscriptions, professional memberships
• Accounting fees (yes — the cost of doing the tax is deductible)
• Bank fees on the business account
• Equipment under $1,000 expensed; over $1,000 depreciated

Keep receipts — IRD can audit up to 7 years back. A simple folder per tax year, or a tool like Hnry / Xero / Solo, handles this.

What you can't (commonly mis-claimed)

• Lunches you eat alone while "working from home" — not deductible
• Clothing for the office (unless it's a uniform with a logo)
• Speeding fines, parking tickets
• Personal portion of household bills
• Entertainment over 50% (only 50% claimable, and rules are tight)

If you're unsure, ask an accountant once at the start. Costs $200-$400 and saves the year-one audit risk.

The annual cycle, at a glance

Stick the dates in your calendar. The penalty for late payment is 1% the day it's late plus 4% after 6 days — not catastrophic, but avoidable.

Tools worth using

• myIR (free, IRD): the legal source of truth for what you owe
• Hnry: bills + tax handling in one (~1% of income) — popular with first-year sole traders who don't want to think
• Xero / MYOB / Solo: full accounting if turnover is rising
• Steady: connects to your bank, shows what's actually arriving net of the GST/tax set-asides, plus your usual safe-to-spend across personal + business accounts

The honest take

The self-employed tax system isn't hard — it's unfamiliar. Most of the panic comes from not knowing the calendar and not setting aside money as it lands. Fix those two things in week one and you'll never have an April surprise.

If you're starting next month: open the tax-reserve account today, move 30% of the first invoice the day it lands, and book a 30-minute call with an accountant before the second one. That's the whole setup.