Useful next calculations
When to use this calculator
- Before comparing personal loan or credit offers on the same amount and term.
- When you want to see total interest, not only the monthly payment.
- When you are choosing between a shorter term and a lower monthly debit.
- When you need a planning estimate before making a credit application.
A worked example
These are the example figures the calculator opens with.
| Input | Value |
|---|---|
| Current Loan Balance (NZ$) | NZ$30,000 |
| Annual Income (NZ$) | NZ$60,000 |
| Expected Annual Income Growth (%) | 3% |
| Based Overseas? | No — NZ based (interest-free) |
For those figures the calculator returns:
- Annual repayment: NZ$4,304.64
- Weekly repayment: NZ$82.78
- Years to pay off: 7.00
- Total repaid: NZ$34,902.21
- Interest rate: 0.00%
Method & assumptions
New Zealand student loans are administered by Inland Revenue (IRD) and are unique internationally because they carry zero interest for borrowers who remain in New Zealand. Compulsory repayments are triggered once your before-tax income exceeds the annual threshold — set at $24,128 for the 2026/27 year — at which point 12 cents per dollar above that threshold is deducted through PAYE or included in your income tax assessment. This calculator uses those exact IRD parameters to estimate your annual and weekly deduction at your current income, then projects year-by-year repayments forward, factoring in your expected income growth, to show the total years until your balance reaches zero and the total amount repaid over that period.
If you are an overseas-based borrower, IRD charges interest at 3.5% per annum on your outstanding balance and sets a fixed repayment obligation rather than an income-based one. This calculator models that scenario by applying the 3.5% interest charge to each year’s opening balance before subtracting repayments, so you can compare the cost of living abroad versus returning to New Zealand where the interest-free benefit resumes immediately. For official figures, repayment schedules, and to set up or adjust your repayment deduction code, visit ird.govt.nz/student-loans.
Common mistakes
- Using an assumption that is not supported by a current local quote, bill, statement or official source.
- Treating a generic estimate as a lender, provider, payroll or tax authority decision.
- Mixing monthly and annual inputs without converting them consistently.
- Testing only one scenario instead of checking how a cautious assumption changes the result.
What to do next
- Run a second scenario with a cautious assumption so you can see the downside clearly.
- Compare the result with the related calculators below before making a decision.
- Check current local rules, eligibility and provider terms before applying or committing money.
- Keep a record of the assumptions so you can update the estimate when a quote, bill or pay figure changes.