ESCT Calculator NZ 2026
This calculator works out the Employer Superannuation Contribution Tax (ESCT) you owe on the KiwiSaver or other superannuation contributions you pay for an employee. Under New Zealand tax law, an employer's cash contribution to an employee's super scheme is taxable, and the rate charged depends on how much the employee earns. You choose the employee's pay frequency (weekly, fortnightly, monthly or yearly), enter their income per payslip, set the employer superannuation contribution percentage, and tell the calculator whether that contribution rate already has ESCT built into it or not. From these figures it annualises the employee's gross income for the year ended 31 March and matches it against the current IRD ESCT rate thresholds, which for 2026/27 run from 10.5 per cent up to 39 per cent depending on earnings. The results show the pay periods per year, the annualised gross income, the applicable ESCT rate, the employer superannuation deduction per payslip, the ESCT owing per payslip, and the net superannuation contribution the employee actually receives after tax. This makes it easy to check payroll calculations, budget for the true cost of KiwiSaver contributions, or work out how much to gross up a contribution so the employee receives a specific net amount. Rates and thresholds are updated for the current tax year, but figures are indicative estimates only, so confirm exact obligations with Inland Revenue or your payroll provider.
Employer Superannuation Contribution Tax, almost always shortened to ESCT, is the tax taken off the contribution your employer makes to your KiwiSaver account or other superannuation scheme. It is deducted before the money reaches your account, which is why an employer contribution of 3% arrives looking smaller than 3% of your pay. ESCT is paid by the employer out of the contribution rather than deducted from your wages, so it does not appear on your payslip as a deduction from take-home pay, and many people never see it at all. The rate is not your PAYE rate. It is set by your total remuneration in the previous tax year, meaning salary plus the employer superannuation contributions you received, and it uses its own set of bands that sit at different thresholds from the income tax ones. That difference catches people out: someone on the 30% income tax rate is not necessarily on the 30% ESCT rate. This calculator works out the rate that applies to you, the tax on each contribution, and what actually lands in your account.
How ESCT is worked out
There are three steps. First your employer establishes your total remuneration for the previous tax year, adding the employer superannuation contributions to your gross earnings. If you did not work for them for the whole of that year, or at all, they estimate what you will earn this year instead. Second, that figure is matched to an ESCT band to give a rate. Third, the rate is applied to each employer contribution as it is made, and the remainder is paid into your account.
The rate is fixed for the whole tax year once it is set, so a pay rise partway through the year does not change your ESCT rate until the following year. It is worked out per employer, so someone with two jobs can be on two different ESCT rates at the same time.
ESCT rates for the 2026/27 tax year
| Total remuneration last year | ESCT rate |
|---|---|
| Up to $18,720 | 10.5% |
| $18,721 to $64,200 | 17.5% |
| $64,201 to $93,720 | 30% |
| $93,721 to $216,000 | 33% |
| Over $216,000 | 39% |
Worked example
The figures below are the ones this page shows when you open it, before you change anything.
An employee is paid $3,200.00 a fortnight. A fortnightly payroll runs 26.09 times a year, using 365.25 days to allow for leap years, so their gross income for the year is $83,485.71. That sits in the third ESCT band, giving an ESCT rate of 30.00%.
Their employer contributes 3.5% of gross pay, which is $112.00 for the fortnight. ESCT of 30% on that contribution is $33.60, so $78.40 is what actually reaches the KiwiSaver account.
Change the pay figure above and every number moves with it, including which band the annual income falls in and therefore the rate.
Getting the rate right
The most common error is using the current year's salary rather than last year's total remuneration, which puts anyone who has had a pay rise into too high a band. The second is forgetting to include the employer contributions themselves in that total, which understates it. Both are the employer's responsibility to get right, but the consequence lands on the employee's balance, so it is worth checking against your own figures.
If the wrong rate has been used, the correction is made through the employer's payroll rather than in your personal tax return, since ESCT is the employer's tax rather than yours.