Understanding PAYE Tax Rates and KiwiSaver Deductions
Your bracket sets your income tax — but your tax code and your KiwiSaver choice decide what actually leaves your pay. Get them wrong and you could be owed money.
Find out if you’re owed a tax refund →The wrong code often means an overpaymentPAYE: how your employer works out the deduction
PAYE (Pay As You Earn) is the system your employer uses to deduct income tax before you’re paid. They don’t guess — they apply your tax code to the official brackets and send the tax straight to Inland Revenue. For most salaried Kiwis this means you never file a return at all.
The catch is the tax code itself. The main ones:
| Code | When it applies |
|---|---|
| M | Your main or highest source of income |
| ME | Main income, and you qualify for the Independent Earner Tax Credit |
| SB / S / SH / ST | Secondary income — rate depends on your total combined earnings |
Using the wrong secondary code is the single most common reason for a year-end surprise. Pick a code that’s too low and you’ll owe; too high and you’ve handed Inland Revenue an interest-free loan all year.
The ACC earner’s levy nobody mentions
On top of PAYE, every earner pays the ACC earner’s levy — 1.67% of gross earnings for 2025/2026, up to an earnings cap of $152,790. It funds the accident compensation scheme and shows as a separate line on your payslip. It’s not optional and it’s easy to forget when you’re estimating your take-home.
KiwiSaver: the deduction that’s secretly a pay rise
KiwiSaver looks like just another deduction, but it behaves differently from tax. Your contribution (3%, 4%, 6%, 8% or 10% of gross pay) leaves your pay — but two things flow back in:
Government contribution: 25c for every $1 you contribute, up to a set annual maximum.
That’s why dropping your KiwiSaver rate to lift your take-home is rarely the win it looks like — you’re walking away from the employer match and the government top-up. The bigger lever isn’t the rate; it’s where your KiwiSaver fund is invested. The difference between a default conservative fund and a growth fund among the main KiwiSaver funds can be enormous over a working life.
Many people review their provider once and never again. Comparing the managed funds and investment funds offered by the big NZ providers and banks — fees, fund type, long-run returns — is one of the highest-value hours you can spend on your retirement savings. The right growth fund can outpace a default fund by six figures over decades.
So if PAYE is automatic, ACC is fixed, and KiwiSaver is largely your choice — where does the money you’ve overpaid actually go? More importantly, how do you get it back? That’s the one step most Kiwis never take.