What is a fixed and floating split and which is better in 2026?

A fixed and floating split means you divide your home loan into two or more portions — some locked at a fixed interest rate for a set term, and some sitting on a floating rate that moves with the market. The right mix in 2026 depends on your risk tolerance, your cash flow goals, and where you think interest rates are heading over the next year or two.

I’m JJ van der Westhuizen, a Senior Mortgage Adviser based on Auckland’s Hibiscus Coast, and I see this question come up constantly with first home buyers in Orewa, Whangaparaoa, and right across Auckland. The split strategy is one of the most flexible tools in mortgage structuring, but it only works if it matches your actual situation.

What does a fixed and floating split actually look like?

When you set up a split, you’re asking the bank to treat your total loan as multiple accounts. Each portion can have its own interest rate type and term.

For example, you might put half your mortgage on a one-year fixed rate and the other half on floating. Or you could split three ways: a third on six months fixed, a third on two years fixed, and a third floating. The bank treats each portion separately for interest calculation and repayment scheduling, but they all sit under the one overall loan facility.

The key benefit is flexibility. You’re not forced to pick one strategy and live with it for years. You can hedge your bets, lock in certainty where you want it, and keep optionality where you need it.

Why would you choose a floating portion at all?

Floating rates are almost always higher than short-term fixed rates when you first lock them in. So why bother?

The floating portion gives you freedom. You can make unlimited extra repayments without penalty. You can pay the whole thing off tomorrow if you win Lotto or sell the property, and there’s no break fee. If you’re planning to sell within a year, or if you expect a bonus or inheritance that you want to throw at the mortgage, floating keeps that door wide open.

Floating also moves with the market. If the Official Cash Rate (OCR) drops and banks pass that through, your floating rate drops too. You benefit immediately, without waiting for a fixed term to expire. That’s appealing when the rate cycle is trending down, which has been the case through late 2024 and into 2025.

I work with a lot of clients in Silverdale and Millwater who are self-employed or commission-based. Their income is lumpy. A floating portion lets them smash the mortgage when cash flow is strong, without being locked into a rigid fixed structure.

What are the benefits of keeping part of your loan fixed?

Fixed rates give you certainty. You know exactly what your repayment will be for the next six months, one year, two years, or longer. That makes budgeting easier, especially for first home buyers who are still getting used to the rhythm of mortgage repayments, rates bills, and insurance all hitting at once.

If rates rise during your fixed term, you’re protected. Your repayment doesn’t change. That peace of mind is worth a lot, particularly if you’re stretching to afford the property in the first place.

Fixed portions also let you ladder your refixes. If you split your loan into multiple fixed terms with different expiry dates, you’re not exposed to a single point in time when all your debt comes up for renewal. You spread your refix risk across the cycle. That’s a strategy I recommend often, especially when there’s uncertainty about where rates are heading over the next couple of years.

How do you decide what percentage to fix versus float?

There’s no universal answer. It comes down to your goals, your cash flow, and your risk appetite.

If you value certainty and you’re on a tight budget, you might fix most or all of your loan. If you’re planning to sell soon, or if you expect to make big lump sum payments, you might keep most of it floating or on very short fixed terms.

A common middle-ground strategy in 2026 is to fix the bulk of the loan — say two-thirds or three-quarters — to lock in repayment certainty, and leave the rest floating so you can make extra repayments or take advantage of further rate drops without penalty.

Another approach is to ladder multiple fixed terms. For example, split your loan into thirds: one portion on six months, one on one year, one on two years. Every six months, something comes up for refix, and you get a fresh look at the market. You’re never fully locked in, but you’re never fully exposed either.

I had a couple in Red Beach last month who were nervous about rates but also wanted to renovate within the year. We put half their loan on a one-year fix for stability, and left half floating so they could pay down the mortgage aggressively once the renovation was done and they had cash flow back. That mix gave them both certainty and flexibility.

What about cash flow and repayment amounts?

Your split structure affects your weekly or fortnightly repayment. Fixed portions have a set repayment amount. Floating portions recalculate every time the rate changes, so your repayment can go up or down.

If you’re budgeting tightly, having a large floating portion means your repayments are less predictable. That can be stressful. On the other hand, if rates drop, your repayment drops too, freeing up cash flow immediately.

Make sure you model both scenarios before you commit. Ask your adviser to show you what happens to your total repayment if the floating rate moves up or down. That gives you a sense of your exposure.

Which split is better in 2026 specifically?

The rate environment in early 2026 is quite different from where we were a year or two ago. The OCR has come down significantly from its recent peak, and the market has stabilised. Floating rates have dropped, and fixed rates have compressed, especially at the shorter end of the curve.

That creates a few strategic opportunities. If you think rates will continue to ease or stay flat, keeping a decent chunk on floating or very short fixed terms means you can benefit from further drops or refix at better rates sooner. If you think we’ve hit the floor and rates might tick back up, locking in longer terms now gives you protection.

But here’s the thing: no one knows for sure. Not the banks, not the economists, not the Reserve Bank. The best strategy is usually the one that lets you sleep at night and still gives you room to move if your circumstances change.

In my conversations with clients across the Hibiscus Coast — from Gulf Harbour to Hatfields Beach — the most common split in 2026 is around two-thirds fixed (often split across two different fixed terms) and one-third floating or on a very short fix. That mix gives stability, laddering, and flexibility all in one package.

Can you change your split later?

Yes, but with conditions. When a fixed portion expires, you can refix it, move it to floating, or pay it off entirely without penalty. That’s your window to reshape the split.

If you want to change the split mid-term — say, break a fixed portion early to move it to floating — you’ll likely face a break fee. Break fees can be substantial if rates have dropped since you fixed, because the bank loses the margin they were expecting over the remainder of your term.

Floating portions can be moved to fixed at any time without penalty, as long as the bank allows it. Most do. That gives you a one-way option: if rates start rising and you panic, you can lock in the floating portion quickly.

What are the risks of a split strategy?

The main risk is complexity. Multiple portions mean multiple refix dates, multiple rate conversations, and more admin. If you’re not paying attention, you might miss a refix deadline and roll onto a default rate, which is usually higher than you’d get if you proactively chose a new term.

Another risk is paralysis. Some people spend so much time trying to optimise their split that they delay refixing altogether, and end up worse off. The perfect split doesn’t exist. The goal is to get close enough, lock it in, and move on with your life.

There’s also the risk of regret. If you fix and rates drop, you’ll feel like you missed out. If you float and rates rise, you’ll wish you’d locked in. That’s the nature of interest rate risk. A split strategy reduces regret by spreading your exposure, but it doesn’t eliminate it.

How does a split work with offset accounts or revolving credit?

If you’re using an offset account or revolving credit facility, those are almost always floating products. You can’t offset against a fixed portion.

So if you want the benefits of offset — where your savings or income sitting in the account reduces the interest you pay on the mortgage — you’ll need to keep at least part of your loan floating or on a revolving credit structure.

A common setup is to fix the bulk of your loan for certainty, and keep a smaller portion on revolving credit or offset so you can use your cash flow efficiently. That’s particularly useful for self-employed buyers or anyone with irregular income.

I work with a lot of families in Stanmore Bay and Millwater who use this approach. They fix most of their mortgage, then park their income and savings in an offset account linked to a floating portion. It’s a nice middle ground between certainty and efficiency.

Key takeaways

• A fixed and floating split lets you divide your mortgage into portions with different interest rate structures, giving you both certainty and flexibility.
• Floating portions allow unlimited extra repayments and no break fees, and they move with the market — useful if rates are falling or if you plan to pay down debt quickly.
• Fixed portions lock in your repayment amount and protect you from rate rises, making budgeting easier and reducing risk.
• The right split depends on your cash flow, your risk tolerance, your plans for the property, and where you think rates are heading.
• In 2026, a common strategy is to fix the majority of your loan across one or two terms for stability, and keep a portion floating or on a short fix for flexibility and access to further rate drops.
• You can reshape your split when fixed terms expire, but breaking a fixed portion early usually triggers a break fee.
• Offset accounts and revolving credit only work with floating portions, so if you want to use those tools, you’ll need to keep part of your loan unfixed.

Frequently asked questions

Can I split my mortgage into more than two portions?

Yes. Most banks will let you split your loan into multiple portions — three, four, or even more. Each portion can have its own rate type and term. The more portions you have, the more refix dates you’ll manage, but it also gives you more control over your interest rate risk and repayment flexibility.

Is there a minimum size for each portion in a split?

Usually, yes. Banks often require each portion to be above a certain dollar amount, but the threshold varies by lender. If your total loan is small, you might be limited in how many ways you can split it. Your adviser can tell you what the current minimums are for the lenders you’re considering.

What happens if I want to pay off one portion completely?

If you pay off a floating portion, there’s no penalty. If you pay off a fixed portion before its term ends, you’ll likely face a break fee. Once a fixed term expires, you can pay it off without penalty. Many people use this strategy to chip away at their mortgage over time by paying off portions as they come up for refix.

Does a split affect my interest rate?

Not directly. Each portion is priced according to its own rate type and term, based on the bank’s current pricing. Splitting doesn’t make rates higher or lower. But it does give you more control over your average rate over time, because you’re not locked into a single decision point.

Can I change my split when I refix?

Absolutely. When any portion comes up for refix, you can change the split however you like — move money between portions, change the number of portions, or consolidate everything into one. That’s one of the big advantages of a split strategy: you get regular opportunities to adjust as your situation and the market change.

Do all banks offer split mortgages?

Most major banks and many second-tier lenders offer split structures, but the flexibility and rules vary. Some lenders make it easy to manage multiple portions online. Others require more manual intervention. If you want a split, make sure your adviser checks which lenders support the structure you’re after and how user-friendly their systems are.

Bank policies, rate cycles, and your own circumstances all shift over time. If you’re buying on the Hibiscus Coast or anywhere in Auckland and want to talk through what split makes sense for your situation in 2026, get in touch. I’m here to walk you through the options with current numbers and a strategy that fits your goals.

JJ van der Westhuizen (FSP1000031) is a Senior Mortgage Adviser operating under the FAP licence of Mortgage Design NZ Limited (FSP752291). This article is general information only and does not constitute personalised financial advice. Specific lender policies, government scheme thresholds, and interest rates change frequently — for advice tailored to your situation, please get in touch.