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When Should You Refinance Your Home Loan?
Refinancing — moving your home loan to a new lender or renegotiating your existing one — is one of the most practical ways to save money over the life of your mortgage. Yet many New Zealand homeowners sit on the same loan for years without ever checking whether they could be doing better. In 2026's stabilising rate environment, it's worth taking a close look.
What Is Refinancing?
Refinancing means replacing your existing mortgage with a new one — either at your current bank (called refixing or restructuring) or by moving to a different lender entirely. The most common reasons people refinance are:
- To access a better interest rate: If rates have dropped since you last fixed, or a competitor is offering a more attractive deal, refinancing can reduce your repayments significantly.
- To release equity: If your property has increased in value, you may have built up equity that you can access to fund renovations, invest, or consolidate debt.
- To consolidate debt: Rolling high-interest personal loans or credit card debt into your mortgage can reduce your overall interest burden — though it's important to increase repayments to avoid turning short-term debt into 30-year debt.
- To change your loan structure: You might want to switch from principal and interest to interest-only (or vice versa), add an offset account, or adjust your fixed/floating split.
When Does Refinancing Make Financial Sense?
The classic rule of thumb is that refinancing is worth it if you can reduce your interest rate by at least 0.5% and you plan to stay in the property long enough to recoup the costs. But in New Zealand, the analysis is more nuanced because of break fees on fixed-rate loans and the cash contributions banks offer to attract refinances.
Let's run a practical example. Suppose you have a $600,000 loan currently fixed at 6.5% with 18 months remaining on your term. A competing bank offers 5.8% on a 2-year fix with a $3,000 cash contribution. At face value, moving saves 0.7% in rate — but before you act, you need to calculate:
- What is the break fee from your current bank?
- What are the legal fees for transferring to the new lender (typically $800–$1,500)?
- How much does the rate difference actually save in dollar terms over the new fixed period?
If the rate saving over 2 years is $8,400 and the total cost to move (break fee + legal) is $3,500, you're clearly better off. But if you're 3 months into a fixed term and the break fee is $6,000, the maths may not stack up until you're closer to your refix date.
Break Fees: The Key Cost to Understand
Break fees (or early repayment charges) apply when you exit a fixed-rate loan before the term ends. In New Zealand, banks calculate break fees based on the difference between your existing rate and the bank's current wholesale rate for the remaining term. When rates fall significantly, break fees can be substantial — sometimes $10,000–$20,000 or more on larger loans. When rates rise, break fees can be close to zero.
Always get the exact break fee figure from your current lender before making any refinancing decision. Banks are required to provide this on request.
Cash Contributions from New Lenders
One of the incentives banks use to attract refinancing borrowers is cash contributions — essentially a cash payment at settlement, often $2,000–$5,000 or more depending on loan size. This money is yours to use however you like: reduce your loan balance, cover moving costs, or bank it.
However, cash contributions usually come with a clawback period — typically 3–4 years. If you leave the bank before that period ends, you'll need to repay a pro-rated portion of the contribution. Factor this into your planning, especially if you think you might sell or refinance again within a few years.
Equity Release: Accessing Your Property's Value
If your property has increased in value since you bought it, you may have more equity than you think. Refinancing can be a way to access that equity — called a top-up or cash-out refinance — to fund a renovation, help a family member, or invest in another property.
Banks will typically lend up to 80% of your property's current value. So if you bought for $650,000, your mortgage is now $450,000, and the property is now worth $900,000, your maximum loan would be $720,000 — giving you access to $270,000 in equity (minus your existing $450,000 balance = $270,000 available). The bank will assess your serviceability on the higher loan amount.
When to Review Your Mortgage
There are natural trigger points to review your mortgage:
- At refix time: When your fixed term expires, you're free to move lenders without break fees. This is the most cost-effective time to compare the market.
- After property value increases: A valuation showing higher equity may unlock better rates or access to equity.
- Change in income: A promotion, new income stream, or income reduction all affect what loan structure makes sense.
- Life events: Divorce, a new baby, a business acquisition — any major change is a good reason to review your loan.
As a general rule, reviewing your mortgage at least once a year is good financial hygiene — even if you don't act, you'll know where you stand.
Refinancing at the right time can save you thousands and give you access to better structures and features. But the maths needs to stack up, and the timing matters. The advisers at Kiwi Mortgages can run the numbers for your specific loan and tell you whether it's worth moving now or waiting for a better window. Book a free consultation at kiwimortgages.co.nz.
