Mortgages with JJA fixed and floating split means dividing your home loan into two or more portions — some locked in at a fixed interest rate for a set term, and some sitting on a floating rate that moves with the market. It is a middle-ground strategy that gives you some rate certainty while keeping some flexibility for extra repayments or early exit without penalty.
Whether a split suits you in 2026 depends on your financial goals, how much flexibility you need, and where you think interest rates are heading. There is no universal better answer — it comes down to your situation and your tolerance for rate movement.
I am JJ van der Westhuizen, a Senior Mortgage Adviser based on Auckland’s Hibiscus Coast, and I see clients in Orewa, Whangaparaoa, Silverdale, and across the wider Auckland region work through this question regularly. Let me walk you through how splits work, why people use them, and how to think about your own structure in the current environment.
How does a fixed and floating split work?
When you take out a mortgage, you do not have to put the entire loan on one interest rate type. You can split it into portions — say, half fixed for two years and half floating, or three quarters fixed across different terms and one quarter floating.
Each portion is treated separately. The fixed portions lock in their interest rate for the term you choose — commonly one, two, three, or five years. During that time, the rate does not change regardless of what happens in the market. The floating portion sits on a variable rate that can move up or down at any time, usually in response to changes in the Official Cash Rate (OCR) set by the Reserve Bank of New Zealand.
You make regular repayments on each portion, and most lenders let you manage them through a single account interface. The split is not permanent — when a fixed term ends, you can refix that portion, move it to floating, or restructure the whole loan again.
Why do people use a fixed and floating split?
The main reason is balancing certainty with flexibility. A fully fixed loan gives you predictable repayments, which is great for budgeting, but it locks you in. If you want to make lump sum payments to reduce your loan faster, most fixed loans either cap how much extra you can pay or charge penalties for overpayments. If you need to sell or refinance early, break fees can be significant.
A fully floating loan gives you total flexibility — you can pay off as much as you like whenever you like, and you can exit without penalty. But your repayments move with the market, which can be stressful if rates rise quickly.
A split lets you have some of both. You get the stability of fixed repayments on part of your loan, so you know a baseline portion of your budget is protected. And you keep the floating portion available for extra payments, offset arrangements, or early exit without penalty.
I see this structure a lot with first home buyers on the Hibiscus Coast who expect a pay rise, bonus, or KiwiSaver refund they want to throw at the mortgage. They fix the bulk for certainty but keep a portion floating so they can accelerate repayments without penalty.
It is also common with people who are not sure how long they will stay in the property — maybe a job change or family plans are on the horizon. Keeping part of the loan floating means they can sell or refinance without a big break fee on the entire balance.
What are the trade-offs of a split strategy?
The upside is balance. You are not fully exposed to rate rises, and you are not fully locked in if your situation changes or you want to pay down debt faster.
The downside is that you do not get the full benefit of either extreme. If rates fall significantly, the fixed portion does not benefit — you are stuck at the higher rate until the term ends. If rates rise, the floating portion goes up, so your repayments are not fully protected.
You also need to actively manage a split. When fixed terms expire, you need to decide whether to refix, and for how long, or shift more to floating. It is not set-and-forget. That is where working with a mortgage adviser helps — I help clients in Orewa and across Auckland refix at the right time and adjust their structure as their situation changes.
Another consideration is that floating rates are typically higher than short-term fixed rates in a stable or falling rate environment. So if you keep a large portion floating just for flexibility you rarely use, you might be paying more interest than necessary.
Which is better in 2026 — fixed, floating, or a split?
There is no single right answer, because it depends on where rates are now, where they are likely headed, and what matters most to you.
In early 2026, the OCR has come down significantly from its recent peak and has stabilised. Fixed rates have also dropped and are sitting at levels much lower than they were a year or two ago. Floating rates have come down too, but they remain higher than short-term fixed rates at most lenders.
If you think rates are going to stay flat or keep drifting down slowly, locking in a long fixed term might mean you miss out on further falls. In that case, a shorter fixed term or a split with some floating exposure could make sense.
If you think rates have bottomed out and might start rising again, locking in now for a longer term gives you protection. A split could still work here — you lock in the bulk for certainty and keep a smaller floating portion for flexibility.
If your main goal is flexibility — maybe you are planning to sell within a year or two, or you have irregular income and want to make big lump sum payments — a larger floating portion or even fully floating might suit, despite the rate being higher today.
And if you want certainty above all else — you are a first home buyer stretching your budget, or you just want to know exactly what your repayments will be for the next few years — fixing the majority or all of your loan makes sense, even if it means you miss some downside if rates fall further.
How do you decide the right split percentage?
Start with your goals and your financial situation. Ask yourself: how much rate movement can I handle in my budget? Do I plan to make extra repayments? Am I likely to move or refinance in the next couple of years?
A common starting point is fixing the majority — say, seventy to eighty percent — and keeping a smaller portion floating for flexibility. This gives you stable repayments on most of your loan and a buffer for lump sums or early exit without a big penalty.
If you have a high risk tolerance, expect rates to fall, or want maximum flexibility, you might flip that and keep more floating. If you want maximum certainty and do not plan to make extra payments, you might fix the entire loan or close to it.
You can also split your fixed portion across multiple terms — for example, a third fixed for one year, a third for two years, and a third for three years. This is called laddering, and it means your fixed terms expire at different times, giving you regular opportunities to reassess and adjust without your entire loan coming up for refix at once.
I work through this with clients based on their income stability, savings plans, and how long they expect to stay in the property. The right split is personal, and it can change over time as your situation or the market shifts.
Can you change your split later?
Yes, but with some limitations. When a fixed term expires, you can choose to refix that portion, move it to floating, or restructure the whole loan. That is your regular opportunity to adjust the split without penalty.
If you want to change the split mid-term — say, break a fixed portion early to move it to floating or refix at a new rate — you will likely face break fees. These can be significant if rates have fallen since you fixed, because the bank loses the difference between what you agreed to pay and what they can now lend that money out at.
Floating portions can be moved to fixed at any time without penalty, so if rates start rising and you want to lock in, you have that option.
The key is to think ahead when you set up your split. If you know your situation might change in a year, do not lock everything in for three years. If you know you will want to make extra payments, keep enough floating or on a short fixed term to accommodate that.
Key takeaways
- A fixed and floating split divides your mortgage into portions with different rate types, balancing certainty and flexibility.
- Fixing gives you stable repayments and protection from rate rises, but limits extra payments and can trigger break fees if you exit early.
- Floating gives you full flexibility to pay extra or exit without penalty, but your rate and repayments can move with the market.
- A split lets you have some of both — common structures fix the majority for certainty and keep a portion floating for flexibility.
- The right split depends on your goals, your budget, your plans, and where you think rates are headed.
- You can adjust your split when fixed terms expire, but changing mid-term usually involves break fees on fixed portions.
- Laddering your fixed portions across different terms gives you regular refix opportunities and reduces the risk of locking in at the wrong time.
Frequently asked questions
Can I have more than two portions in my split?
Yes, most lenders let you split your mortgage into multiple portions — for example, three fixed terms of different lengths plus one floating portion. This is common for laddering strategies. Each portion is managed separately, and you can adjust them as they expire.
Is there a minimum size for each portion in a split?
Most lenders set a minimum dollar amount for each portion, often in the range of ten to twenty thousand dollars, but this varies by lender. If your total loan is small, you might be limited in how many portions you can create. Check with your lender or adviser for current minimums.
Does a split cost more in fees?
Generally no — splitting your loan does not usually add extra fees beyond the standard application or annual account fees. Some lenders charge a small fee per additional portion, but this is uncommon. The main cost consideration is whether you are paying a higher rate on the floating portion than you would on a fixed alternative.
Can I use a split with an offset account?
Yes, but offset accounts typically only work with floating portions or specific flexible fixed products. If you want to use an offset to reduce interest, you would keep that portion of your loan floating or on a flexible structure, and fix the rest. This is a common strategy for people with savings they want to offset against the mortgage.
Should I fix for one year or longer in 2026?
It depends on your view of where rates are heading and your need for certainty. Shorter terms give you more frequent opportunities to adjust if rates keep falling, but you take on more refix risk if rates rise. Longer terms lock in current rates for more years, which is valuable if you think rates have bottomed. Many clients ladder across multiple terms to spread the risk.
What happens to my split if I refinance to a different lender?
If you refinance, you will need to break any fixed portions that have not yet expired, which may trigger break fees. The floating portion can be paid out without penalty. The new lender will let you set up a new split structure from scratch. If you are considering refinancing, factor in potential break fees and compare them against the benefit of the new loan terms.
Bank policies, rate environments, and your own financial situation all shift over time. If you are working through your mortgage structure on the Hibiscus Coast or anywhere in Auckland and want a current read on what makes sense for your situation, get in touch.
JJ van der Westhuizen (FSP1000031) is a Senior Mortgage Adviser operating under the FAP licence of Mortgage Design 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.