Pay off your NZ mortgage sooner
Extra Repayment Calculator New Zealand
Calculate how extra repayments on your New Zealand mortgage reduce your loan term and total interest paid.
Enter your details
Added to your regular payment each month
Applied once per year
Total interest saved
$131,828
Paid off 4 yr 1 mo sooner by paying an extra $200/month
Old payoff
30 years
$808,158 total interest
New payoff
25 yr 11 mo
$676,330 total interest
Time saved
4 yr 1 mo
Interest saved
$131,828
Monthly payment comparison
Current monthly payment
$3,912
New monthly payment
$4,112
How this calculator works
Making extra repayments when you're on a floating (variable) rate is straightforward in New Zealand — most lenders allow unlimited extra repayments without penalty. These go directly to reducing your principal.
If you're on a fixed rate, extra repayments may be limited or attract a break fee. Many NZ borrowers split their mortgage — fixing a portion and keeping some on floating — specifically to maintain the ability to make extra repayments on the floating portion.
Even small additional payments early in your loan make a disproportionate difference. When you reduce your balance in year 1 or 2, you avoid paying interest on that amount for the remaining 28 or 29 years.
Worked example
- 1Standard monthly repayment: NZ$3,921
- 2New effective payment: NZ$4,321/month
- 3Standard total interest: NZ$811,560
- 4With NZ$400 extra: NZ$638,200
- 5Interest saved: ~NZ$173,360 | Time saved: ~7 years 4 months
Frequently Asked Questions
Related Calculators
Mortgage Repayment Calculator
Calculate your base monthly mortgage payment before adding extra.
Try calculatorRefinance Savings Calculator
Compare refinancing vs making extra payments on your current loan.
Try calculatorRental Yield Calculator
Calculate the rental yield on an investment property.
Try calculatorDisclaimer: Calculations are estimates for general guidance only and do not constitute financial advice. Mortgage rates, LVR restrictions, and lending criteria vary by lender and may be subject to RBNZ requirements. Consult a registered financial adviser before making property decisions.