New Zealand student loans charge 5.6% interest per year, with penalties of 9.6% compounded daily when borrowers fall behind. Here's how the numbers work.
A doctor was stopped at Wellington airport last month. He was trying to board a flight to Australia — and was arrested instead. He owed about $180,000 on a student loan that had grown over decades of non-payment. His brother, in a similar situation, owed more than $300,000.
The case made headlines. But the mechanism behind it — compound interest on an unpaid New Zealand student loan — is worth examining on its own terms.
How the interest rate works
As of 1 April 2026, the annual interest rate charged on New Zealand student loans is 5.6%. That rate is set each year by the government.
If a borrower keeps up with repayments, the interest is neutralised — the loan shrinks over time as payments are made. But if a borrower stops paying, the interest builds. And on top of the standard interest rate, IRD applies a penalty rate of 9.6% per year, which compounds daily.
Student loan lawyer Dave Ananth, a former IRD prosecutor, told RNZ that the penalty layer is what catches many people off guard. "If you don't pay that, there's penalties of 9.6 [percent], that's compounded daily," he said.
The compounding effect over time
Ananth cited a specific example of how powerful daily compounding can be. A $30,000 loan left untouched for roughly 20 years can grow to around $120,000 — four times the original amount. The 5.6% interest and 9.6% penalty charges roll into the balance each day, and the following day the new total is charged again.
To be clear: the $30,000 figure is a base amount used as an illustration. Actual outcomes depend on the starting balance, how long repayment is deferred, and whether any partial payments are made along the way. But the underlying math applies to any balance that sits unpaid.
New Zealand's student loan scheme was introduced in 1992. Since then, the landscape of who owes and why has grown more complex.
The scale of the problem
IRD data shows approximately 114,000 people living overseas have student loans, and nearly 70% of those borrowers are in default — meaning they have missed payments or exceeded allowable repayment deferral periods. The total amount owed by that group sits at about $2.5 billion.
Many borrowers overseas initially deferred repayment when they left New Zealand, Ananth said. "They thought ok, we'll come back to the student loan a little when things settle down — that never happens and then after 15, 20 years you get a massive bill from IRD."
The loan scheme was designed for people studying in New Zealand, but the population carrying the debt has diversified considerably over three decades.
Provisions that exist
The Student Loan Scheme Act contains provisions for borrowers experiencing genuine hardship. One mechanism allows IRD to remit some — not all — of the penalty charges that have built up, if a borrower engages and demonstrates an inability to pay.
Ananth said engaging with IRD is the critical first step. "There are provisions, but what I'm saying is engage."
His core message was blunt: "Ultimately, I think it's a student loan debt, it's taxpayer funded, you've got to pay it back."
The doctor's case and his brother's larger debt illustrate the endpoint of extended non-engagement. Whether the outcome involves a payment plan, a partial penalty remission, or some other arrangement, the debt does not simply expire.
This article is for general information only and is not personalised financial advice. Seek advice from a licensed financial adviser (registered on the FSPR) for guidance specific to your situation.