How to Refinance Your Home Loan in New Zealand: The Complete Guide

If your fixed-rate term is about to roll over — or you suspect your bank has quietly stopped offering you its sharpest rate — refinancing could save you thousands of dollars over the life of your loan. Refinancing simply means replacing your existing mortgage with a new one, either at a different bank or on better terms with your current lender. Timed well and done for the right reasons, it is one of the most powerful levers a New Zealand homeowner has; done carelessly, it can cost more than it saves. This guide walks through how refinancing works, the real costs, exactly when to move, and what lenders look at. It is general information, not financial advice.

Why New Zealanders refinance

At its core, refinancing means paying out your current home loan and taking a new one in its place. The most common reasons in New Zealand are:

• A lower interest rate — especially a “new-to-bank” special that existing customers rarely see offered to them.
• Cashback — the main banks regularly offer a cash contribution of roughly 0.5%–1% of the loan amount to win new borrowers.
• Restructuring — splitting the loan across fixed and floating portions, or adding a revolving-credit or offset account to cut interest.
• Releasing equity — borrowing against a higher property value for renovations or a deposit on an investment property.
• Debt consolidation — rolling higher-interest debt into the mortgage at a much lower rate (with important caveats, below).
• Better features or service — sharper digital banking, more flexible repayments, or simply a lender that suits you better.

For the wider picture, our home loans guide explains how New Zealand mortgages are structured, and our guide to how ANZ and BNZ mortgage rates work covers special-versus-standard rate tiers and fixing versus floating.

How refinancing works, step by step

Whether you stay with your bank or switch, the process follows a predictable path. Allowing three to four weeks from application to settlement is realistic.

1. Work out your position. Note your current balance, rate, fixed-term expiry date and any cashback you received. Estimate your property’s current value and loan-to-value ratio (LVR).
2. Run the numbers. Compare your current rate with what competing lenders advertise and estimate the savings over your remaining term. A free tool such as Sorted’s mortgage calculator is a good starting point.
3. Get a break-fee estimate. If you are still inside a fixed term, ask your current bank in writing what it will cost to break — they must provide an estimate.
4. Check your clawback. Read your loan agreement for how much cashback you would have to repay if you leave.
5. Gather documents and apply. Payslips or financial statements, bank statements, ID and proof of insurance. Apply to the new lender, or have a mortgage adviser apply on your behalf.
6. Approval and offer. The new lender assesses you and issues a loan offer along with instructions to your solicitor.
7. Legal work and settlement. A solicitor discharges the old mortgage and registers the new one; the new loan pays out the old, and you begin repayments with the new lender.

When refinancing makes most sense

Timing a refinance well makes a real difference to the outcome. The clean, no-cost scenario is switching as a fixed term expires; the others involve a trade-off worth checking carefully.

Because the direction of the Official Cash Rate feeds through to mortgage pricing, it is worth watching the Reserve Bank’s monetary-policy announcements before you lock in a new fixed term.

The real costs of switching

The excitement of a lower rate or a cashback cheque makes it easy to overlook what switching actually costs. Weigh every item below against your expected savings and work out a break-even point — the number of months of savings it takes to recover the cost of switching.

The two costs that most often change the maths are the break fee and the cashback clawback. A break fee applies if you end a fixed-rate loan early; it is based on the difference between your contracted rate and current wholesale (swap) rates for your remaining term, multiplied by your balance — so it can be near zero when wholesale rates have risen above your fixed rate, or substantial when they have fallen. A cashback clawback means repaying part of a cash contribution your current bank paid you if you leave within its clawback window — commonly three to four years, now worked out on a pro-rata basis across the industry following a 2024 Commerce Commission review. Use our home loan calculator to model the savings before you commit.

Comparing lenders

New Zealand’s mortgage market is led by the four major banks — ANZ, ASB, BNZ and Westpac — alongside Kiwibank and a growing set of non-bank lenders, each with different refinance strengths. Look beyond the headline rate at: the rate you can actually negotiate (not just the advertised special); the cashback amount and its clawback period; loan features such as offset, revolving credit and penalty-free extra repayments; service quality and turnaround; and any legal-fee contribution. Consumer NZ‘s banking research is a useful independent check on service and complaint handling before you commit.

Debt consolidation: the opportunity and the risk

Rolling personal loans, car finance or credit-card balances into your home loan is one of the more appealing reasons to refinance — and one of the most misunderstood. The rate saving is real and often large: moving debt from 15–20% personal-loan or credit-card rates into a home loan (around 5% in late 2026) slashes the monthly interest cost. But home loans run 20–30 years, so if you consolidate a $20,000 debt and then make only the minimum repayment, you can end up paying far more in total interest simply because it is spread over a much longer period. The discipline is to keep repaying the consolidated amount at the old, faster pace — or park it in a revolving-credit or offset facility and attack it hard. Our debt consolidation guide covers this in depth. Rule of thumb: only fold debt into your mortgage if you have a credible plan to clear it faster than the full loan term, not slower.

What lenders look at

A refinance is assessed like any new home loan, and the rules have shifted in recent years:

• Income — payslips for employees; two years’ financial statements and IR3 returns if self-employed.
• Debt-to-income (DTI) — since 1 July 2024 the Reserve Bank’s DTI rules limit how much high-DTI lending banks can write: lending above six times gross income for owner-occupiers (seven times for investors) is capped at a small share of each bank’s new lending, so a high DTI can narrow your options.
• Loan-to-value ratio (LVR) — if your equity has grown you may drop into a sharper rate tier; many lenders price better below 80% LVR and better again below 60%. LVR settings were last eased on 1 December 2025.
• Credit history — defaults, missed payments and hardship arrangements are visible to lenders.
• Affordability — the Credit Contracts and Consumer Finance Act (CCCFA) still requires lenders to make reasonable inquiries that a loan is affordable, but the prescriptive 2021 regulations that forced line-by-line expense checks have been removed, so the process is less onerous than a few years ago. From 1 July 2026 the Financial Markets Authority, rather than the Commerce Commission, oversees consumer credit.

If your circumstances have changed since you first borrowed — lower income, new dependants or more debt — a refinance can be harder than expected, and a mortgage adviser can help find a lender whose policies fit. Our first-home buyer guide explains LVR and DTI in more detail.

Your next steps

Refinancing rewards preparation. Pull together your loan details and run the numbers — even a rough calculation shows whether the likely savings justify the effort. If they look promising, get a written break-fee estimate from your current bank, check your loan agreement for clawback terms, and approach at least two competing lenders, or a licensed mortgage adviser, for indicative offers. If you use an adviser, confirm they appear on the Financial Markets Authority register; advisers are usually paid by the lender and have a duty to act in your best interests. Compare the full cost picture — rate, cashback, legal fees and clawback — before you commit. The best refinance is one where you have done the maths, understood every cost, and chosen a lender you are confident will serve you well through the next fixed term and beyond.

Disclaimer: This article is general information about refinancing a home loan in New Zealand, not financial advice and not a recommendation of any lender or product. Interest rates, cashback offers, fees, break costs and lending criteria vary between lenders and change over time. Always obtain a written break-fee estimate, check your loan agreement for clawback terms, and compare the total cost of switching before committing. Consider advice from a registered mortgage adviser or licensed financial adviser.

Frequently asked questions

Is it worth refinancing my mortgage in NZ?

It can be — a lower rate or a cashback can save thousands over your loan — but only if the savings outweigh the switching costs, such as break fees, cashback clawbacks, and legal and valuation fees. Work out your break-even point: if you would sell or refix before then, it may not be worth it. The clearest win is switching at your fixed-rate expiry, when there is no break fee.

What is a mortgage break fee, and how much is it?

A break fee is what your bank charges to end a fixed-rate loan early. It is based on the difference between your contracted rate and current wholesale rates for the remaining term, multiplied by your balance. It can be negligible or zero when rates have risen above your fixed rate, but thousands of dollars when they have fallen. Your bank must give you a written estimate before you proceed, so always ask for one.

What is a cashback clawback?

If your current bank paid you a cashback when you signed up, your loan agreement almost certainly requires you to repay part of it if you leave within a set period, commonly three to four years. Since a 2024 Commerce Commission review the repayable amount is worked out on a pro-rata basis, reducing as you move through the period. Check your agreement, because a clawback can wipe out the benefit of switching.

When is the best time to refinance?

Usually the 60-day window before your fixed rate expires, because most banks let you lock a new rate up to 60 days ahead, so you can switch with no break fee. It can also make sense if wholesale rates have dropped enough that the savings beat any break fee, if your equity has grown enough to reach a better LVR rate tier, or if your income or credit profile has improved.

What does refinancing cost?

Beyond any break fee and cashback clawback, expect roughly $900 to $1,800 in legal or conveyancing fees, often subsidised by the new lender; possibly $700 to $1,200 for a registered valuation if a free automated one will not do; and a new establishment fee of $0 to $500, which is frequently waived for refinances. Factor every item into your break-even calculation.