How to Choose Between Fixed, Floating & Split Loans

Choosing the right interest rate structure for your home loan affects both your repayments and your flexibility. Fixed, floating, and split loans each serve different purposes, and the choice depends on how much certainty you want, how actively you plan to manage your mortgage, and whether you expect rates to move.

How Fixed Rate Home Loans Work

A fixed rate mortgage locks your interest rate for a set period, typically one to five years. Your repayments stay the same during that term, regardless of what happens to the Official Cash Rate or wholesale funding costs.

Consider a Wellington buyer securing a two-year fixed rate at the time of purchase. Over those two years, even if the Reserve Bank raises the OCR twice, the borrower's repayments remain unchanged. That certainty makes budgeting straightforward, particularly for households managing tight cash flow or those who prefer to avoid surprises. The trade-off is that if rates fall during the fixed period, you continue paying the higher rate unless you break the loan and pay the associated costs.

Fixed rates in New Zealand are priced based on wholesale swap rates, not the OCR directly. That means banks set fixed rates by looking at what they expect funding to cost over the fixed term. If the market anticipates rate cuts, you might see lower fixed rates even before the OCR moves. If the market expects increases, fixed rates rise ahead of time.

Most fixed rate loans in New Zealand limit your ability to make extra repayments. Some lenders allow you to pay an additional 5% of the original loan balance per year without penalty, but anything beyond that triggers early repayment charges. If you expect a bonus, inheritance, or sale proceeds during the fixed term, that restriction matters.

How Floating Rate Mortgages Work

A floating rate mortgage moves in line with your lender's variable rate, which typically changes when the Reserve Bank adjusts the OCR. Your repayments can go up or down at any time, and you receive little advance notice beyond the general economic commentary surrounding OCR reviews.

The advantage of a floating rate is flexibility. You can make unlimited extra repayments, pay off the loan in full without penalty, or switch to a fixed rate whenever you choose. For borrowers who are about to sell, receive irregular income, or want the option to redirect cash into the mortgage when it suits them, a floating rate provides that freedom.

Floating rates are usually higher than short-term fixed rates. That difference reflects the flexibility premium. In a falling rate environment, floating borrowers benefit immediately. When rates rise, the impact hits your repayments within weeks.

In our experience, floating rates suit borrowers in transition. If you are selling one property and buying another within six months, keeping the loan floating avoids break costs when you repay. If you are waiting on a work bonus or legal settlement and plan to reduce the mortgage substantially in the near term, the higher rate might be offset by the ability to act without restriction.

What a Split Loan Structure Offers

A split loan divides your mortgage into two or more portions, each with its own rate structure. You might fix 70% of the loan for two years and leave 30% floating, or split the fixed portion across multiple terms such as one year and three years.

This structure lets you balance certainty with flexibility. The fixed portion protects you from rate increases on the majority of your debt, while the floating portion allows extra repayments or gives you a hedge if rates fall. You can also stagger fixed terms so that only part of your loan comes up for refixing at any one time, which smooths out the impact of rate changes.

As an example, a Wellington homeowner with a $600,000 mortgage might fix $420,000 for two years and leave $180,000 floating. If they receive a $20,000 bonus, they can pay it directly onto the floating portion without penalty. If rates drop, the floating portion benefits immediately, and when the two-year term ends, they can reassess and refix based on current conditions. If rates rise, the bulk of their mortgage remains insulated.

Split loans require more active management than a single fixed rate, but they also give you more control. You can adjust the split each time a fixed term expires, responding to changes in your income, rate outlook, or repayment goals. Most mortgage brokers in Wellington recommend a split structure for borrowers who want some certainty but are not comfortable locking everything away for several years.

Choosing the Right Structure for Your Situation

Your choice between fixed, floating, and split loans should reflect your financial situation and how much risk you are willing to carry. If your income is steady and you value predictable repayments, a fixed rate provides that stability. If you are in a period of change or expect to make large lump sum payments, a floating rate keeps your options open. If you want both, a split loan delivers a middle path.

Wellington's property market, with its mix of suburban family homes and inner-city apartments, attracts a wide range of buyers, from first-time purchasers stretching their deposit to experienced owners refinancing investment properties. The rate structure that suits a first home buyer in Newtown, focused on keeping repayments manageable, will differ from the structure that works for an upgrader in Khandallah who expects to sell their current home within a year.

Rate expectations also matter. If you believe rates will rise, fixing locks in current pricing. If you expect rates to fall, floating or a shorter fixed term lets you benefit sooner. If you are unsure, a split loan reduces the chance that you lock in at the wrong time or remain exposed when rates climb.

Another consideration is whether you expect to pay down the loan faster than required. If you plan to direct extra income toward your mortgage, a floating portion or a loan with flexible repayment features makes that possible. If you are content with scheduled repayments and prefer not to think about the loan until the fixed term ends, a straightforward fixed rate works well.

How Break Costs Apply to Fixed Rate Loans

Break costs arise when you repay, restructure, or switch a fixed rate loan before the end of the agreed term. If wholesale rates have fallen since you fixed, your lender has to replace your loan at a lower rate, and they pass that funding loss on to you. If rates have risen, there is usually no break cost because the lender can reinvest at a higher rate.

The calculation depends on the difference between your fixed rate and the current wholesale rate for the remaining term, multiplied by the loan balance and the time left. For a $500,000 loan fixed at 5.5% with two years remaining, if the equivalent wholesale rate has dropped to 4.8%, you could face a break cost in the range of several thousand dollars. The exact figure depends on your lender's formula and the specific swap rates on the day you break.

Break costs are one reason borrowers choose split loans. If you fix only part of your mortgage, you can repay or restructure the floating portion without penalty, and if you need to break the fixed portion, the cost applies to a smaller balance.

If you are planning a sale, considering refinancing, or expect a significant change in your financial situation during the fixed term, factor in the possibility of break costs when deciding how much to fix and for how long.

Managing Your Home Loan as Rates Change

Once your loan is in place, the structure is not permanent. Each time a fixed term expires, you can choose to refix, switch to floating, or adjust your split. That refixing point is the time to reassess your situation, review current rates, and decide whether your original strategy still fits.

If you initially fixed for two years and rates have fallen, you might refix for another two years at the lower rate. If rates have risen and you expect further increases, you might extend to a longer term. If your circumstances have changed and you now plan to sell within twelve months, moving to floating avoids another fixed term and the associated break costs.

Wellington buyers often underestimate how much their priorities shift over the life of a home loan. A borrower focused on stability in year one might prioritise flexibility in year three after a job change or inheritance. Regular check-ins with a mortgage adviser help ensure your loan structure adapts as your situation evolves.

Floating rates also change over time, and you have the option to fix part or all of your floating balance whenever you choose. If you see rates starting to climb and you are on a floating rate, you can lock in a fixed rate before the next OCR increase. That responsiveness is one benefit of keeping at least part of your mortgage floating.

Call one of our team or book an appointment at a time that works for you. We work with clients across Wellington to structure home loans that match your goals, whether you are buying your first home, upgrading, or refinancing an existing mortgage.

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