How is the monthly repayment calculated?

The calculator uses the standard amortizing loan formula. The annual interest rate is converted into a monthly rate, and the loan amount is divided into equal monthly repayments over the loan term so the balance reaches zero at the end of the term.

Why does more of my payment go toward interest early on?

Interest is charged on the outstanding balance each month, and the balance is highest at the start of the loan. As the balance shrinks with each repayment, less of each payment goes toward interest and more goes toward principal, even though the total repayment stays the same.

Does this include LVR restrictions, fees, or offset accounts?

No. This calculator estimates principal-and-interest repayments only. It does not account for loan-to-value ratio restrictions, application or valuation fees, offset or revolving credit structures, or break costs on fixed-rate loans, which vary by lender.

Does this work for fixed and floating rate loans?

Yes. Enter the rate that currently applies to your loan. Floating rates can change, so re-run the calculation with the new rate whenever your lender adjusts it to see the updated repayment.

What loan term should I use?

Most New Zealand home loans run 25 to 30 years. Enter the remaining term in years for an existing loan, or the proposed term for a new loan application.

New Zealand Mortgage Calculator

Name: New Zealand Mortgage Calculator
Availability: InStock
Author: Nham Vu

Enter your loan amount, interest rate, and loan term to get your New Zealand mortgage repayment, interest-versus-principal split, and a yearly amortization summary.

Loan Details

Loan Amount (NZD)

NZ$

Interest Rate (% per year)

Loan Term (years)

Enter your loan details to see the repayment breakdown.

Monthly Repayment

NZ$0.00

Total Interest

NZ$0.00

Total Repaid

NZ$0.00

First Payment Breakdown

Principal: NZ$0.00 Interest: NZ$0.00

Yearly Amortization Summary

Year	Principal Paid	Interest Paid	Remaining Balance

Copied!

Summary

Enter your loan amount, interest rate, and loan term to get your New Zealand mortgage repayment, interest-versus-principal split, and a yearly amortization summary.

How it works

Enter the loan amount in New Zealand dollars.
Enter the annual interest rate as a percentage.
Enter the loan term in years.
Read the monthly repayment and the interest-versus-principal split in the results panel.
Scroll the yearly amortization summary to see the balance decline over the loan term.

Use cases

Estimating monthly repayments before applying for a home loan in New Zealand.
Checking how a higher interest rate changes the monthly repayment.
Comparing loan terms, such as 25 years versus 30 years.
Seeing how much of each early repayment goes toward interest versus principal.
Estimating the remaining loan balance at a given year of the term.

Frequently Asked Questions

Last updated: 2026-07-24 · Reviewed by Nham Vu