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When Should I Refix My Mortgage in NZ? A Practical Guide
Your fixed mortgage term is ending — or maybe it ended months ago and you're sitting on a floating rate wondering what to do. Refixing is one of the most consequential financial decisions most New Zealanders make every few years, and the stakes are higher when rates are moving. This guide walks through how to think about refixing, when breaking early might make sense, and what questions to ask your bank.
What Happens When Your Fixed Term Ends?
When your fixed rate expires, your mortgage automatically rolls onto your bank's floating rate — which is almost always higher than the best available fixed rates. Most banks will contact you 30–60 days before your refix date, but the responsibility to act is yours. If you do nothing, you'll pay the floating rate until you actively refix. In a high-rate environment that might not matter much. In a falling rate environment, floating can be expensive.
Should You Fix or Float?
Floating gives you flexibility — you can make extra repayments or break without a fee. Fixed gives you certainty — you know exactly what you're paying for the term. For most New Zealand households with a tight budget, fixed is the default choice. The certainty makes budgeting easier. Floating tends to suit people who expect rates to fall quickly, plan to sell soon, or want maximum repayment flexibility.
How Long Should You Fix For?
This is the hardest question and nobody gets it perfectly right. A few principles:
Short terms (6 months–1 year) suit a falling rate environment — you reset sooner and can refix at a lower rate when the term ends
Medium terms (2–3 years) balance certainty with flexibility — the most common choice for NZ borrowers
Long terms (4–5 years) suit borrowers who want certainty and believe rates will rise — less popular in 2025–2026 with rates falling
How to read the rate environment: The easiest starting point is interest.co.nz — it tracks current fixed rates across all NZ banks and shows historical trends, so you can see at a glance whether rates are high or low relative to recent years. For forward guidance, the RBNZ publishes an OCR forecast with each Monetary Policy Statement — search "RBNZ OCR forecast" to find the latest. If rates are still falling, shorter terms may give you more flexibility. If rates appear to have bottomed, locking in longer can start to make sense.
Should You Break Your Fixed Rate Early?
Sometimes the right move is to break your current fixed rate before it expires and refix at a lower rate. Banks charge a break fee to compensate for their wholesale funding loss — but if rates have fallen enough, the interest saving can outweigh the cost. The maths depends on your remaining balance, the rate differential between your current rate and the new rate, how long you have left on your fixed term, and the current wholesale swap rate versus when you originally fixed.
What to Ask Your Bank at Refix Time
What are your current fixed rates for each term?
What is the floating rate and how does it compare?
Can I make a lump sum payment before refixing?
Is there a cashback offer for refixing?
What break fee would apply if I wanted to break early?
Don't just accept the first rate your bank offers. Banks often have special rates not advertised on their website — and a mortgage adviser can access rates across multiple lenders simultaneously.
The Refix Checklist
Know your refix date — set a calendar reminder 60 days out
Check current rates across major NZ banks (interest.co.nz is a good starting point)
Consider whether a lump sum payment makes sense before refixing
Decide on term length based on your rate view and cashflow needs
Ask about special rates — don't just accept the advertised rate
Update your loan details in Owly after refixing
Frequently Asked Questions
What happens if I miss my refix date in NZ?
If you miss your refix date, your mortgage automatically rolls onto your bank's floating rate — which is almost always higher than the best available fixed rates. You can refix at any time, but you'll pay the floating rate until you do. Set a calendar reminder 60 days before your refix date to give yourself time to compare options.
Is it worth breaking my fixed mortgage early in NZ?
It depends on the break fee and the rate differential. If wholesale swap rates have fallen significantly since you fixed, the interest saving over your remaining term may outweigh the break fee. Use a break fee calculator to estimate — and always get a formal settlement quote from your bank before proceeding.
Should I fix or float my mortgage in NZ right now?
Most NZ households choose fixed for the certainty it provides. Floating suits borrowers who expect rates to fall quickly, plan to sell soon, or want maximum repayment flexibility. In a falling rate environment, some borrowers split their mortgage across fixed and floating to get a mix of both.
How do NZ wholesale swap rates affect fixed mortgage rates?
NZ banks price fixed mortgage rates based on wholesale interest rate swaps — the rate at which they can fund lending in financial markets. When swap rates fall, fixed mortgage rates tend to follow. The RBNZ publishes swap rate data in its B2 statistical series.
Can I split my mortgage across multiple fixed terms?
Yes — splitting is common in NZ. For example, fixing half for 1 year and half for 2 years means you're not fully exposed to rate movements at any single refix date. It's a way to hedge uncertainty about where rates are headed.