What happens when my fixed mortgage term ends?

Your loan rolls onto a new rate, which you can re-fix or let float. If rates have risen since you fixed, your repayments jump. Knowing the new repayment ahead of time lets you prepare your budget or look at re-fixing options.

How big is the repayment jump?

It depends on the gap between your old and new rates and your remaining balance. A rise of one or two percent on a large balance can add hundreds of dollars a month, which is why the rollover can be a shock.

Can I avoid the jump?

You cannot avoid the new market rate, but you can shop around, negotiate, split your loan across terms, or increase repayments while rates are low to reduce the balance before the rollover.

Mortgage Fixed-Rate Rollover Calculator

This New Zealand calculator shows how much your repayments jump when your fixed term ends and your loan rolls onto a new rate. If rates have risen since you fixed, the new repayment can be a real shock, so seeing it ahead of time lets you prepare. You enter your remaining balance, your old and new rates and the remaining term, and the tool shows the old and new repayments and the monthly increase.

Remaining balance

Old fixed rate

New rate

Remaining term (years)

extra per month after the rollover

Old repayment$0

New repayment$0

Extra per year$0

Compares table repayments at the old and new rates over the remaining term. Shop around and consider splitting across terms or increasing repayments before the rollover. Estimate only, not a loan offer.

How it works

The calculator works out the table repayment on your remaining balance at both your old fixed rate and the new rate, over the remaining term. The difference is the repayment jump you face when the fixed term ends. Seeing it early lets you budget for it, shop around for a better rate, or pay extra now to reduce the balance before the higher rate applies.

Worked example

On a $500,000 balance over 25 years, rolling from 4.49% to 5.79% lifts the repayment from about $2,779 to $3,156 a month, a jump of roughly $377 a month or $4,520 a year.

Related calculators

Fixed vs Floating Calculator: fix or float.
Interest Rate Rise Impact Calculator: rate rises.
Mortgage Repayment Calculator: repayments.
Mortgage Refinance Calculator: refinancing.

If you've found a bug, or would like to contact us, or learn more about James Graham and Calculate.co.nz.

Calculate.co.nz is partnered with Interest.co.nz for New Zealand's highest quality calculators and financial analysis.

All calculators and tools are provided for educational and indicative purposes only and do not constitute financial advice.

Calculate.co.nz is proudly part of the Realtor.co.nz group, New Zealand's leading property transaction literacy platform, helping Kiwis understand the home buying and selling process from start to finish. Whether you're a first home buyer navigating your first property purchase, an investor evaluating your next acquisition, or a homeowner planning to sell, Realtor.co.nz provides clear, independent, and trustworthy guidance on every step of the New Zealand property transaction journey.

Calculate.co.nz is also partnered with Health Based Building and Premium Homes to promote informed choices that lead to better long-term outcomes for Kiwi households.

Calculate.co.nz is hosted in Auckland via SiteHost new Zealand.

All content on this website, including calculators, tools, source code, and design, is protected under the Copyright Act 1994 (New Zealand). No part of this site may be reproduced, copied, distributed, stored, or used in any form without prior written permission from the owner.