NZ Mortgage Overpayment Calculator

Already have a mortgage? See how much sooner you could pay it off — and how much interest you'd save — by making extra repayments. Live NZ bank rates for reference, updated daily.

1. Your Mortgage

$
1 yr30 yrs
1 mo5 yrs
%

2. Your Extra Repayment

$

This is on top of your regular repayment. Even small extra amounts compound significantly over time.

Fixed Rate Overpayment Limits by Bank

Most NZ banks allow limited extra repayments on fixed rate mortgages without break fees. Floating rate has no restrictions.

BankAllowance on Fixed RateConsequences if Exceeded
ANZUp to $250/week extra, plus a 5% lump sum per yearBreak fees may apply beyond this
ASBIncrease repayments up to $500/fortnight or $1,000/monthIncrease must be maintained; lump sums incur ERA
BNZUp to 5% of loan balance per year (Standard loans)Break fees; Classic loans have no free threshold
KiwibankUp to 5% of loan balance per yearBreak fees may apply beyond this
WestpacIncrease repayments up to 20% above minimumLump sums incur break fee + $20 admin fee
Co-operative BankUp to 5% of loan balance per year (min $1,000)Break fees may apply beyond this
SBS BankAny changed repayment$45 fee per change, plus possible break fees
TSBUp to $10,000/year; increase up to $1,000/month (max 3×/yr)Break fees may apply beyond this
All banksFloating rate: no limits — repay any amount, any time, no fees

Source: interest.co.nz. Rules vary by loan product — always confirm with your bank before making extra repayments.

This calculator is for illustrative purposes only and does not constitute financial advice. Rates shown are sourced from publicly available data and updated daily but may not reflect your actual mortgage rate. Always confirm terms directly with your lender before making financial decisions.