When Should You Refix Your Mortgage in NZ?

Your fixed mortgage rate is about to end, and suddenly the lender’s offer is in your inbox. It can feel like a decision you need to make immediately. But when should you refix mortgage lending? Ideally, you start considering it well before the expiry date, with a clear view of your budget, goals and the choices available to you.

Refixing is not simply about chasing the lowest advertised rate. The right fixed term should give you manageable repayments while supporting what you plan to do next, whether that is buying your first home, renovating, investing, selling, or getting ahead on the loan.

Start looking before your fixed term expires

Most lenders will contact you before your current fixed period ends, often with an offer to choose a new term through internet banking or a quick phone call. It is convenient, but convenience is not always the same as a well-considered decision.

A good time to review your mortgage is usually several weeks before the fixed term ends. This gives you time to understand current rates, check how repayments may change and decide whether your existing loan structure still suits you. It also avoids making a rushed choice because your rollover date is only days away.

If you leave it until after the expiry date, your loan will commonly move to a floating rate. That can provide flexibility, but floating rates are often higher than fixed rates. If the move was unplanned, the higher repayment can put unnecessary pressure on your household budget.

Do not refix purely because the bank has sent an offer

A bank’s refix offer may be appropriate, particularly if your circumstances have not changed and you are happy with the proposed repayment. Still, it is worth pausing before accepting it. The rate is only one part of the decision.

Check the term length, repayment amount, ability to make extra repayments, cash contributions that may be tied to the loan, and whether you expect a major change during that period. A very low rate is less helpful if it locks you in just as you need flexibility.

Choose a term that matches your plans

The best time to refix is often when you can match the loan term to your likely plans. No one can predict interest rates with certainty, and trying to pick the exact bottom of the market can lead to stress and second-guessing. Focus instead on what you can afford and how much certainty you need.

A shorter fixed term may suit you if you expect rates could change, want the freedom to reassess sooner, or have a sale, renovation or income change on the horizon. It can also be useful for borrowers who want to make a larger lump-sum repayment in the near future.

A longer fixed term can make sense when payment certainty matters most. If you have a young family, are moving from renting into your first home, or simply prefer knowing your mortgage repayment for longer, locking in can make household planning easier. The trade-off is less flexibility if your situation changes.

For many borrowers, the answer is not choosing one term for the whole loan. Splitting the mortgage across different fixed periods can spread the risk. For example, part of the loan might be fixed for a shorter period and part for longer. This means not every dollar of your mortgage comes up for refixing at the same time.

Check the repayment, not just the interest rate

A lower interest rate does not automatically mean a lower financial commitment in every situation. Your repayment depends on the loan balance, remaining loan term, payment frequency and whether you are keeping repayments at the minimum or paying extra.

Before refixing, ask what your new repayments will be at each term you are considering. Then test them against real life: groceries, childcare, insurance, rates, transport, school costs and the expenses that do not show up in a lender’s calculator.

It is sensible to leave room in your budget rather than fixing at a repayment level that only works in a perfect month. This matters even more for self-employed borrowers, contractors and business owners whose income can vary through the year. A mortgage structure should support your cash flow, not make it harder to manage.

Consider keeping repayments higher where possible

If your income has increased or your spending is under control, you may be able to keep repayments above the new minimum when you refix. Paying more can reduce your principal faster and lower the total interest paid over the life of the loan.

However, check the loan terms first. Fixed mortgages often have limits on extra repayments, and exceeding them may trigger an early repayment charge. If you want the option to make larger repayments, keeping a portion floating or using an offset or revolving credit facility may be worth considering. These options are not right for everyone, but they can provide useful flexibility when used with a clear plan.

Refixing is a good time to review the whole structure

Your refix date is one of the best opportunities to review more than the rate. Circumstances can change quickly over one, two or five years. You may have had a pay rise, started a business, welcomed a child, bought an investment property or built up savings that could work harder against your debt.

It is also a useful time to check whether your home loan is still with the lender and product that best fit your needs. Changing lenders can involve an application, valuation, legal work and other costs, so it is not always worthwhile. Yet it can be worth exploring if your current lender is not competitive, your structure no longer works, or you need lending that better reflects your income and future plans.

A refinance should never be done for a headline rate alone. The potential savings need to outweigh the costs, effort and any break fees on loans that are still fixed. The stronger reason to review is to make sure your mortgage is working for you, rather than simply rolling over because it is familiar.

Be careful if you may sell, buy or renovate soon

Think carefully before fixing for a long period if you expect to sell your property or buy another one soon. You may be able to take your existing loan to a new home through portability, but this is subject to lender approval and the details of the new purchase. It should not be assumed.

Selling a property while a fixed loan is in place can also create a break fee, particularly when interest rates have moved. The cost can be significant in some cases. If a move is likely within the next year or two, a shorter fixed period or a more flexible loan split may give you more options.

The same applies to renovations and new builds. Construction timelines can shift, costs can change and you may need access to funds at different stages. Your mortgage should be structured around the project rather than treated as a standard refix.

Questions to ask before you commit

Before accepting a refix offer, make sure you can answer these practical questions:

• What will my repayments be at each available fixed term?
• Can I comfortably afford them if household costs rise?
• Do I expect to sell, upgrade, renovate or make a lump-sum payment soon?
• How much can I repay early without a fee?
• Would splitting my loan give me a better balance of certainty and flexibility?
• Has my income, equity or long-term goal changed since I last fixed?

If the answers are unclear, that is a sign to seek advice before locking anything in. Mortgage decisions are easier when you see the full picture, not just a list of rates.

Get independent advice before your refix date

An adviser can compare your current position with the available options, explain the practical impact of each choice and help assess whether staying put, restructuring or refinancing makes sense. This is especially valuable if your income is complex, you own multiple properties, or you are planning your next purchase.

Mortgage Time works for you, not one bank. We can help you look beyond the quick online refix offer and build a loan structure that supports your next move. The aim is not to make the process complicated. It is to give you confidence that your mortgage fits your life now and leaves room for where you are heading.

Your refix date is a chance to make a deliberate financial decision. Give yourself enough time to review it properly, and choose the certainty and flexibility that suit your plans.

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