Secondary tax NZ can feel like a mystery surcharge eating into your weekend gig money. If you’re paid by more than one employer, chances are you’ve seen secondary tax NZ on your payslip and wondered why Inland Revenue is holding extra cash. Whether you’re clocking overtime or selling crafts online, secondary tax NZ shouldn’t cost you more than necessary. This guide cuts the jargon and shows you how the rules really work.
We break down the secondary tax code NZ options, explain when to use the flexible STC tax code NZ, and map out the quick steps to switch codes or chase a secondary tax refund NZ. You’ll see exactly how much is withheld on each income slice, when over-deduction happens, and how to claim your money back before your next pay run. By the end, you’ll know which code fits your situation, how to update it in minutes, and the traps that cost side-hustlers thousands every year. No fluff, just practical tactics you can apply today. Stick around and make secondary tax NZ work for you, not against you.
What is secondary tax in New Zealand?
If you earn income from two or more sources, Inland Revenue treats the extra earnings as secondary income and deducts secondary tax NZ at a flat rate. That rate is meant to protect you from under-paying PAYE, but it often over-collects instead.
Understanding multiple jobs tax nz
Holding a second part-time job, freelancing after hours or drawing NZ Super while still working all trigger a secondary tax code.
- It applies only to the income stream you nominate as secondary.
- Your first job stays on the ordinary tax code so the progressive brackets still work.
When do you need a secondary tax code nz?
Most employees default to a secondary code whenever their employer submits an IR330 form that shows another job is already paying PAYE.
- Second or third employment contracts
- Casual, seasonal or on-call work
- NZ Super, ACC or student allowance paid alongside wages
If you’re unsure, the IRD guide on multiple sources of income spells it out. A quick scan of your tax summary inside myIR also confirms which code is active.
IMAGE (purpose: decision-tree graphic showing “do I need a secondary code?”)
Choosing the right stc tax code nz
If you’re paid by more than one employer between 1 April 2025 and 31 March 2026, match all your expected income to the updated secondary-tax bands before handing over an IR330. Picking the right code keeps PAYE accurate and prevents painful year-end wash-ups.
| Secondary code | Your total annual income (2025 – 2026) | Flat rate withheld | Typical use-case |
|---|---|---|---|
| SB | $0 – $15,600 | 10.5 % | Students, weekend shifts, low-income second role |
| S | $15,601 – $53,500 | 17.5 % | Extra retail or hospitality hours |
| SH | $53,501 – $78,100 | 30 % | Skilled casual work, professional contracting |
| ST | $78,101 – $180,000 | 33 % | Senior consulting, executive bonuses |
| STC* | $180,001 + | 39 % (or tailor a lower custom rate) | High earners, variable commission income |
- STC stands for “special tax code.” Inland Revenue lets you lock in a custom percentage if 39 % over-collects.
Quick tips
- Estimate total income first, then choose the band—use our tax brackets NZ guide for a full marginal breakdown.
- Code wrong? File a fresh IR330 or update it in myIR; the change shows on your very next payslip.
- Unsure which percentage suits a lumpy commission? Apply for a tailored STC through Inland Revenue so PAYE lines up with your forecast earnings.
For the official numbers, see IRD’s secondary tax code rates 2025/26 (anchor: “IRD secondary tax code rates”).
How to change your secondary income tax code nz
Switching codes takes minutes and can save hundreds.
- Download form IR330 from the IRD website.
- Tick the new code that matches your total annual income.
- Give the form to payroll or update details inside myIR.
- Check the next payslip to confirm the new rate.
If you regularly cross bands (overtime, bonuses) consider the flexible STC tax code NZ. Our deep dive on tax code NZ shows how to calculate an exact percentage so you never over-pay.
Claiming a secondary tax refund nz
Many workers discover the flat rate took too much once the annual wash-up runs. Signs you have cash waiting:
- Your total income sits near the lower end of a code band.
- You worked the second job for only part of the year.
To collect, file an individual income tax return in myIR or ask BH Accounting to review your end-of-year square-up. According to IRD’s refund statistics, millions are paid back every June. If you earn offshore as well, read our guide on tax overseas income NZ so foreign earnings don’t muddy the waters.
Mini-case study
Sarah earned $60k at her main job and $8k tutoring. Payroll put her on code SH for the tutoring, deducting 30 %. At year-end her true marginal rate on that slice was only 17.5 %, so she pocketed a $1 000 refund after her return.
Conclusion
Nail your secondary tax NZ setup once and you stop gifting IRD interest-free loans. Pick the right secondary tax code NZ, update it fast with an IR330 or myIR, and review your totals each April against the 2025/2026 brackets. If the numbers don’t stack up, grab a secondary tax refund NZ and let that cash work for you. Need a hand crunching the figures or filing? BH Accounting’s team can walk you through a quick code check or tailor an STC so PAYE lines up with real-world earnings. Talk to us before your next pay run and keep more of what you make.
FAQ about secondary tax nz
Do i always pay more tax on a second job?
Not if the right code matches your total annual income. With the correct band, PAYE should equal your marginal rate.
Can i have two “main” jobs?
No. Inland Revenue treats one income stream as primary; every other job must use a secondary code.
How do i avoid the 39 % stc rate if i earn under $180k?
Apply for a tailored special tax code through myIR or form IR23BS; IRD will set a custom percentage.
When are secondary tax refunds issued?
After 31 March each year, once your final earnings are reconciled. Refunds generally land in myIR within eight to ten weeks.
What happens if i pick the wrong code?
Your PAYE will be off. File a new IR330 straight away—any over- or under-payment is corrected at year-end, but it’s better to fix it now.