Inland Revenue's student-loan late payment interest is 9.6% for the 2026–27 tax year, not the unrelated use-of-money-interest rate. It applies to an overdue student-loan repayment when the unpaid amount is at least NZ$334. The 2026–27 ordinary interest rate for an overseas-based loan is 5.6%; an approved instalment arrangement can reduce the late rate to 7.6% while its conditions are met. IRD publishes these rates and the threshold.
Kim's overdue instalment
Kim has an assessed NZ$4,500 overseas repayment that remains unpaid for an illustrative full year. At a simple annual 9.6% multiplication, the late-interest component on that overdue amount alone is about NZ$432 (4,500×0.096). IRD's actual monthly charging and payment allocation can change the precise result. Kim's remaining loan balance may separately accrue standard overseas interest at 5.6%; do not simply add 5.6% of her entire loan to 9.6% of the overdue amount if the two bases overlap.
Paying part does not clear the trigger
Sending a token voluntary payment before the due date does not stop late interest on an unpaid assessed balance. Pay the required amount by the applicable date or contact IRD to arrange payments. The ordinary overseas-based minimum is set by loan balance bands, with payments generally due on 30 September and 31 March under IRD's repayment table. A lender/IRD may revise due dates where notice comes after the standard date.
An arrangement changes the late rate
IRD can sometimes reduce late interest to 7.6% under a qualifying instalment plan if Kim sticks to it. That does not make her whole loan interest-free. The rate chart compares three different 2026–27 percentages: 5.6% ordinary overseas interest on the relevant loan base, 9.6% standard late interest on qualifying overdue repayment, and 7.6% reduced late interest under a compliant arrangement. Rates can change on 1 April each tax year; check myIR for the exact assessment and current status.
