A main-job repayment estimate
This calculator estimates annual New Zealand student loan repayments for a steady main-job salary. It subtracts an entered annual threshold from gross pay, floors the remaining amount at zero, and applies a 12% repayment rate. The result is the estimated annual deduction for this simple scenario. It is not income tax, and it should be kept separate from PAYE when building a take-home budget.
The prefilled threshold is $24,128. The $24,128 threshold is verified for 2026/27 in section 2.2 of the IRD Payroll Calculations and Business Rules Specification. The field is editable so the current confirmed threshold can be used without changing the formula. Check the applicable year before relying on the default for a payroll or filing decision.
Understanding the threshold
With an entered threshold of $24,128, earnings of $24,128 or less produce zero in the annual model. Earnings of $24,129 produce twelve cents. At $50,000, the amount above the threshold is $25,872 and the repayment estimate is $3,104.64. At $100,000, the corresponding estimate is $9,104.64. These worked calculations use the verified 2026/27 threshold; check the applicable specification when calculating a different tax year.
The twelve-percent rate applies only to the amount above the threshold in this main-job model. Multiplying the whole $50,000 salary by 12% would give $6,000 and would answer a different question. The threshold is therefore a material input. A change of $1,000 in that threshold changes the annual estimate by $120 when income remains above both possible thresholds.
Why pay periods can change the result
Actual salary-and-wage deductions use a pay-period threshold. An employee with variable weekly earnings can have deductions in high-pay periods even if an annual average looks modest. This page assumes the annual earnings pattern is sufficiently steady for annualisation to be a useful approximation. It does not reconstruct every pay period or decide whether an exemption or special deduction rate applies.
To check an ordinary payslip, obtain the gross pay for that period, the applicable tax code and the period's threshold from current IRD guidance. If you instead use this annual tool, record that it is an approximation and compare annualised figures consistently. Do not treat a mismatch caused by irregular earnings as proof that the payroll system used the wrong repayment rate.
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The annual threshold entered here is for a main-job scenario. A second job can have different deduction treatment, and the same threshold should not automatically be applied independently to every income source. Adding results from several separate runs with the full threshold in each can understate the combined repayments. The tool does not select your main job or determine a special rate for secondary earnings.
Use M SL or ME SL in the related PAYE calculator when modelling a main job with student loan deductions. ME also assumes independent-earner-credit eligibility, which is a separate tax question. Adding SL does not itself establish eligibility for that credit, and the student loan deduction does not reduce the gross income used for the ordinary income-tax brackets in this model.
Budgeting with the annual result
Divide the annual estimate by the number of budget periods only after calculating it. At the $50,000 example, dividing $3,104.64 by 12 gives $258.72 per average month. That can be a useful reserve or deduction line in a steady-income budget. It should not be represented as an exact payroll amount if your earnings or payment schedule vary.
Keep voluntary extra repayments separate from the required deduction estimate. If you plan to pay an additional $100 each month, that is another $1,200 of annual cash commitment. The calculator does not automatically include it. Separating mandatory and voluntary payments lets you compare the budget impact without implying that the extra payment is required by the twelve-percent rule.
What is outside this model
The tool does not ask for your remaining loan balance, so it does not cap the estimate at that balance or predict the date the loan will be paid off. Near repayment completion, confirm the balance and payroll instructions with IRD. Continuing to budget a full year's standard deductions after the loan is cleared would misrepresent the cash flow, while stopping deductions without confirmation could also be wrong.
Overseas-based borrower obligations, self-employment and other-income assessments are not calculated here. Interest, repayment holidays, exemptions, special deduction rates and arrears can require different information. A person moving overseas should not treat this salary-threshold result as a forecast of their overseas obligations. Use the relevant IRD process for that situation.
A useful verification record
Save annual gross salary, the threshold amount, its tax-year source and whether earnings are steady. Compare the result with your payroll records and student loan account over the same period. If the difference is material, identify whether it comes from the threshold, earnings timing, an adjustment or voluntary payments. That makes a query specific enough to investigate and avoids confusing a loan repayment with an income-tax error.
Frequently asked questions
Is the threshold verified for 2026/27?
Yes. IRD Payroll Calculations and Business Rules Specification, 1 April 2026 to 31 March 2027, section 2.2 confirms $24,128.
Will repayments stop at my remaining balance?
This tool does not collect the loan balance or model repayment completion. Confirm the current balance and payroll instructions with IRD.