Key facts at a glance
Who pays it
Employer's contribution only
Never your own KiwiSaver deduction
How it applies
Flat rate, not marginal
One rate on the whole employer amount
Rate bands (2026/27)
10.5% to 39%
Five bands, set by IRD
Here is what ESCT is, before the mechanics: Employer Superannuation Contribution Tax is the tax IRD withholds from your employer'sKiwiSaver contribution, not from yours. It is not something you pay directly and it never appears as a deduction on your payslip, because it is never part of your salary or your taxable income in the first place. It is deducted before your employer's compulsory 3.5% minimum match ever reaches your KiwiSaver account, which means the number sitting in your account from your employer's side is always somewhat less than the full 3.5% they set aside for you.
This matters because most explanations of KiwiSaver cover the employee side, your own contribution rate, and stop there. ESCT is the other half of the picture: the tax that quietly shrinks what your employer's contribution is actually worth by the time it lands in your fund. Understanding the rate bands, why it is a flat rate rather than a marginal schedule, and roughly how much it costs at your own income level is the point of this article.
See exactly how much ESCT is withheld from your employer's contribution.
Open the ESCT calculatorWhat ESCT actually is, and why it is a flat rate, not marginal bands
Every KiwiSaver member has two separate contributions going into their account each pay run: their own chosen employee rate, deducted from gross pay before PAYE, and their employer's compulsory minimum match (3.5% of gross salary from 1 April 2026). ESCT applies only to the second one. IRD treats the employer's KiwiSaver contribution as income that has never been taxed through PAYE, so it withholds tax from it separately, at source, before it reaches your KiwiSaver provider.
The critical mechanical difference from income tax is that ESCT is not a marginal, band-by-band tax. Your PAYE income tax works in slices: the first portion of your income is taxed at 10.5%, the next slice at 17.5%, and so on, with each band only taxing the income that falls inside it. ESCT works differently: IRD determines a single "ESCT rate threshold amount", your salary or wages plus your employer's gross KiwiSaver contribution, finds which one band that combined figure falls into, and then applies that one flat rate to the entire employer contribution. There is no blending across bands. If your threshold amount lands at $70,000, the whole employer contribution is taxed at 30%, not partly at 17.5% and partly at 30%.
The five ESCT rate bands, 2026/27
These thresholds took effect 1 April 2025 and remain unchanged for the 2026/27 tax year (per IRD and the Taxation (Budget Measures) Act 2024, Schedule 1). The threshold amount is your salary or wages plus your employer's gross KiwiSaver contribution, and whichever single band that combined figure falls into sets the rate for the whole employer contribution.
| Threshold amount (salary + gross employer contribution) | ESCT rate |
|---|---|
| $0 – $18,720 | 10.5% |
| $18,721 – $64,200 | 17.5% |
| $64,201 – $93,720 | 30% |
| $93,721 – $216,000 | 33% |
| $216,001+ | 39% |
Sources: IRD "Get ready for new ESCT and FBT changes", and the Taxation (Budget Measures) Act 2024, Schedule 1, Part D, Table 1. These are the same figures used inside the ESCT calculator.
Worked example: three salary points, three ESCT bands
Each row assumes the 3.5% compulsory employer minimum and the 3.5% employee default rate. "Threshold amount" is salary plus the employer's gross contribution, the figure that determines which band applies. Figures are computed directly from the ESCT calculator's engine.
| Gross salary | Employer gross contribution (3.5%) | Threshold amount | ESCT rate | ESCT withheld | Reaches KiwiSaver |
|---|---|---|---|---|---|
| $50,000 | $1,750 | $51,750 | 17.5% | $306 | $1,444 |
| $80,000 | $2,800 | $82,800 | 30% | $840 | $1,960 |
| $150,000 | $5,250 | $155,250 | 33% | $1,733 | $3,518 |
On a $50,000 salary, the threshold amount ($51,750) falls in the 17.5% band. On $80,000, the threshold ($82,800) falls in the 30% band. On $150,000, the threshold ($155,250) falls in the 33% band. None of this touches the employee's own KiwiSaver contribution, which is calculated and deducted completely separately. Run your own exact salary through the ESCT calculator.
ESCT never touches your own KiwiSaver deduction
This is the single most common confusion about ESCT, so it is worth stating plainly: ESCT only ever applies to your employer's compulsory minimum contribution (3.5% of gross salary) or any voluntary employer top-up above that. Your own KiwiSaver contribution, whatever rate you have chosen, is deducted from your gross pay before PAYE is calculated, exactly as covered in our KiwiSaver explainer, and ESCT has no effect on it whatsoever. The two sit on completely separate tracks: your contribution goes gross pay to KiwiSaver account, PAYE-taxed as part of your salary before it is deducted; your employer's contribution goes salary to employer contribution to ESCT withheld to KiwiSaver account, never touching your payslip or your taxable income at all.
Looking for KiwiSaver contribution rates generally?
For a full breakdown of KiwiSaver contribution rates generally, how much your own 3.5%/4%/6%/8%/10% employee rate costs you, how the ACC Earner's Levy fits in, and how to choose a rate, see KiwiSaver explained: how much it actually costs you. This article focuses specifically on ESCT, the tax withheld from your employer's contribution, which that broader guide does not cover in depth.
Work out your own ESCT band and net KiwiSaver total
Enter your salary to see your ESCT rate, how much is withheld from your employer's contribution, and the total actually landing in your KiwiSaver account each year.
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Frequently asked questions
Does ESCT apply to my own KiwiSaver contribution?
No, never. ESCT (Employer Superannuation Contribution Tax) only ever applies to your employer's contribution into your KiwiSaver account, the compulsory 3.5% minimum match (or any higher voluntary employer top-up). Your own employee contribution, whatever rate you have chosen (3.5%, 4%, 6%, 8%, or 10%), is deducted from your gross pay before PAYE and is completely untouched by ESCT. If you want to see how your own contribution rate affects your take-home pay, that is covered in our KiwiSaver explainer, this article is specifically about the tax withheld from the employer's side.
Why is ESCT a flat rate instead of marginal bands like income tax?
Because IRD designed it that way deliberately, as a withholding mechanism rather than a progressive tax schedule. Your PAYE income tax works in marginal bands, each slice of your income is taxed at the rate for that slice. ESCT does not work like that. IRD first works out which of the five ESCT bands your income falls into, based on your salary plus your employer's gross KiwiSaver contribution, then applies that single band's rate to the entire employer contribution, not slice by slice. A person whose combined threshold amount sits at $65,000 pays 30% on their whole employer contribution, not 10.5% on the first slice, 17.5% on the next, and so on. This is exactly why the Taxation (Budget Measures) Act 2024 describes ESCT as a rate schedule, not a marginal tax table.
What income determines my ESCT rate?
The rate is set from your total prior tax year's salary or wages plus the gross employer KiwiSaver contributions you received in that year (or an estimate for a new employee without a full prior year on record). It is not based on your current pay period alone, and it is not based on your take-home pay after tax. Our calculator uses your current gross salary plus your employer's current gross contribution as a practical stand-in for this, useful for seeing roughly where you sit, but your actual payroll system will use the real prior-year figure IRD requires.
Does ESCT change if my employer contributes more than the 3.5% minimum?
The rate itself does not change because of a higher employer contribution alone, ESCT is a lookup based on your income level, not on how generous your employer's contribution is. But a bigger employer contribution does two things: it adds to the threshold amount that determines your band (since the threshold is salary plus gross employer contribution), which can occasionally push you into the next band if you are close to a boundary, and it means ESCT is withheld from a larger dollar figure, so the tax bill in dollar terms is larger even at the same rate. Voluntary employer top-ups above the compulsory 3.5% minimum are outside the scope of what our calculator models in detail, but the same flat-rate mechanism applies to them.
Is ESCT the same as PAYE?
No, they are two separate deductions covering two separate pools of money. PAYE is withheld from your gross salary, the wages you actually earn. ESCT is withheld from your employer's KiwiSaver contribution, money that was never part of your salary or your taxable income in the first place, it goes straight from your employer to your KiwiSaver account, minus ESCT. Your payslip shows PAYE reducing your salary; ESCT never appears as a line item reducing your pay because it is deducted before the employer's contribution ever reaches your KiwiSaver balance, not from your pay.
How much of my employer's KiwiSaver contribution actually reaches my account after ESCT?
It depends on your ESCT band. At the 17.5% band, roughly 82.5 cents of every employer dollar reaches your KiwiSaver account. At the 30% band, it's 70 cents. At the 33% band, 67 cents. Run your own salary through the ESCT calculator to see the exact dollar figure landing in your account after ESCT, alongside your own employee contribution, which is completely unaffected by ESCT and reaches your account in full.
Do I need to do anything to pay ESCT, or does my employer handle it?
Your employer handles it entirely. ESCT is deducted and remitted to IRD by your employer as part of their payroll process, the same way they handle PAYE, you do not file anything or make a payment yourself. The only thing worth checking on your KiwiSaver statement is that the employer contribution amount actually landing in your account looks consistent with the gross contribution minus ESCT at your expected rate; if it looks off, that is a conversation for payroll, not IRD directly, in the first instance.
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