Key Takeaways
Good mortgage refinancing advice in NZ starts with one question: will switching leave you better off once every cost is counted? This guide explains when refinancing makes sense, when staying put or refixing is the smarter move, and how to test the numbers before you commit.
- Refinancing means moving your loan to a new lender or replacing it with a new loan, which is different from refixing with your current lender.
- Break fees, cashback clawbacks, legal costs and valuation fees can wipe out the benefit of a switch.
- The cleanest time to refinance is usually when a fixed term ends, because break fees generally do not apply then.
- Refinancing the same amount is exempt from the Reserve Bank's LVR and DTI limits, but borrowing more is not.
- A new lender will still check affordability, so a change in income or debts can affect whether switching is possible.
Refinancing, refixing or restructuring: what is the difference?
People often use these words interchangeably, but they lead to very different costs and paperwork. Knowing which one you actually need is the first step in deciding whether switching is worth it.
| Option | What changes | Typical costs to check | When it may suit |
|---|---|---|---|
| Refix with your current lender | New fixed term on the same loan | Usually minimal at the end of a fixed term | You are happy with your lender and just need a new rate period |
| Restructure with your current lender | Loan splits, term, repayment type or features | Possible break fees on fixed portions, admin fees | You want different features without changing banks |
| Refinance to a new lender | The whole loan moves to a new lender | Break fees, discharge fee, legal costs, valuation, cashback clawback | The new lender offers meaningfully better pricing, features or policy |
If you are mainly deciding on a new fixed term, our guide on when to refix your mortgage covers timing and structure in more detail.
Good reasons to refinance your mortgage
Refinancing is worth looking at when your current loan no longer fits your needs and your existing lender will not fix that. The reason should be clear before you start comparing offers.
Better overall pricing
Lenders compete for new customers, and a different lender may offer sharper pricing or a cash contribution for switching. Your current lender may match some of this if asked, so a better deal elsewhere is also useful leverage. Judge any offer on total cost over the period you expect to keep the loan, not the headline rate.
Features your current lender does not offer
You may want an offset account, a revolving credit facility, more freedom to make lump sum repayments, or the ability to split the loan in a particular way. If your lender cannot offer the structure you need, moving can be worthwhile even when pricing is similar.
A lender whose policy suits your situation
Circumstances change. If you have become self-employed, bought an investment property or need lending for a renovation, another lender's policy may suit you better. In that case the refinance is about access to the right lending, not just price.
Releasing equity or consolidating debt
Some people refinance to borrow against equity for renovations or to roll higher-interest debts into the mortgage. This can lower the interest rate on that debt, but it turns short-term borrowing into debt secured on your home and may stretch it over decades. If you consolidate, close the old cards and loans so the balances do not build up again.
When refinancing may not be worth it
Switching lenders is not always the smart move. These are the situations where the costs or risks often outweigh the benefit.
You are partway through a fixed term
Repaying a fixed-rate loan early can trigger a break fee. Under the Credit Contracts and Consumer Finance Act (CCCFA), lenders can charge a reasonable estimate of their loss when you repay early. Break fees tend to be larger when wholesale interest rates have fallen since you fixed and when a lot of the term is left. Always get a written quote before assuming a new rate will save you money.
You would have to repay a cashback
If your current lender paid you a cash contribution, the terms usually require you to stay for a set period. Leaving early can mean repaying all or part of that cash, sometimes on a reducing basis. Check your original loan documents for the clawback period and how the amount is calculated.
Your income or debts have changed for the worse
A new lender assesses you as a new customer. Under the CCCFA it must make reasonable inquiries into your income and expenses, so a drop in income, new debts or a change from salary to self-employment can make approval harder. In that situation, renegotiating with your current lender may be the more realistic option.
Your loan is small or nearly repaid
Legal and other fixed costs are similar whether you owe a large or small amount. On a smaller balance, a better price saves less each month, so the costs take longer to recover. In that case a conversation with your current lender is often the more practical step.
You plan to sell soon
The upfront costs of refinancing take time to recover. If you expect to sell or move again within a short period, the saving may never catch up with the cost of switching.
How to tell if switching pays: the breakeven test
The most useful single number in any refinancing decision is how long it takes for the ongoing saving to cover the one-off cost of switching. If that point comes well before you are likely to sell or refinance again, the switch may make sense.
List every cost of switching
- Break fees on any fixed portions, from a written quote.
- Discharge or early repayment administration fees from your current lender.
- Legal fees to discharge the old mortgage and register the new one.
- Valuation and application fees from the new lender.
- Any cashback you would have to repay to your current lender.
Then subtract any cash contribution the new lender offers, remembering that it will carry its own clawback period.
Work out the breakeven point
Divide the net cost of switching by the expected monthly saving in repayments, using the same loan balance and term for both loans. The result is the number of months to break even. Our loan repayment calculator helps you estimate repayments for each option so you can compare like with like.
Watch out for term extensions
A new loan is often set up over a fresh full term, which lowers repayments partly because you are taking longer to pay. That can make a switch look better than it is. If you can afford it, keep your repayments at the current level after refinancing so the saving goes towards the balance.
Lending rules that affect refinancing in NZ
The Reserve Bank's lending limits and the CCCFA apply to refinancing, but not always in the way people expect.
LVR and DTI exemptions for like-for-like refinancing
The Reserve Bank exempts refinancing from its loan-to-value and debt-to-income restrictions where the new loan does not exceed the original loan value. That means a borrower with a smaller deposit or a high debt-to-income ratio can often still move lenders, subject to the new lender's own policy. The exemption is set out in the Reserve Bank's DTI explainer.
Borrowing more changes the picture
If you increase the loan to release equity or consolidate debt, the additional borrowing is not covered by the refinancing exemption. Since 1 December 2025, banks can make up to 25% of new owner-occupier lending above an 80% LVR and up to 10% of investor lending above a 70% LVR. DTI limits of six times gross income for owner-occupiers and seven times for investors also apply, with 20% speed limits for each.
Affordability checks still apply
Lenders must be satisfied you can meet repayments without substantial hardship. The prescriptive affordability regulations were removed on 31 July 2024, and the FMA took over as consumer credit regulator on 1 July 2026, as explained on the FMA's credit law changes page. Expect to provide income evidence, bank statements and details of your debts.
Self-employed and investor borrowers
If you are self-employed, the new lender will want current financial statements and tax returns, and its policy on business income may differ from your current lender's. Property investors should check how the new lender treats rental income and existing investment debt. These policy differences can make one lender a much better fit than another, regardless of price.
Ask your current lender first
Before moving, tell your current lender what you are considering and what you have been offered. Many lenders would rather keep a customer than lose them, and a retention offer can deliver much of the benefit of switching without break fees, legal costs or clawback risk.
Get any offer in writing, including how long it is available and whether it applies to the whole loan. Then compare it on the same assumptions as the outside offers. If the difference is small, staying usually wins once costs are counted.
When you have decided to move, our step-by-step guide to refinancing a mortgage in NZ walks through the application, settlement and what to check afterwards.
How SHARE - The Advisory can help
We compare your current loan with what other lenders offer, get break fee quotes, factor in any cashback conditions, and tell you plainly whether switching, refixing or staying put looks better. If a switch makes sense, we manage the application through to settlement. Learn more about our refinancing and refixing advice or book a conversation with an adviser.
Conclusion
Refinancing is worth it when the long-term benefit clearly outweighs the cost of switching, and when the new loan fits how you want to manage your mortgage. Timing matters most: switching at the end of a fixed term usually avoids the largest cost.
Work out your breakeven point, check your cashback and break fee position, and ask your current lender what it can do before you move. Sometimes the right answer is to switch, and sometimes it is to stay and renegotiate.
Frequently Asked Questions
Is it worth refinancing my mortgage in NZ?
It can be, if the saving or improved loan features outweigh break fees, legal costs, valuation fees and any cashback you would need to repay. Working out how many months it takes to recover those costs is the clearest test.
What is the difference between refinancing and refixing?
Refixing means choosing a new fixed term with your current lender. Refinancing means moving the loan to a new lender or replacing it with a new loan, which usually involves legal work and more costs.
Can I refinance with a low deposit or high DTI?
Often, yes. The Reserve Bank exempts refinancing from LVR and DTI limits where the new loan is no larger than the original, though the new lender's own policy and affordability checks still apply.
Will I have to repay my cashback if I refinance?
Possibly. Most cash contributions require you to stay with the lender for a set period, and leaving earlier can mean repaying some or all of the cash. Check your loan documents for the exact terms.
When is the right time to refinance?
The end of a fixed term is usually the least expensive time, because break fees generally do not apply. Start reviewing a couple of months before expiry so there is time for approval and legal work.