What a split home loan actually is
A split home loan — also called a split facility or split mortgage — divides a single home loan into two portions: one on a fixed rate, one on a variable rate. Each portion sits in its own account and carries the interest rate and features specific to that part of the loan. It is worth being precise about the framing, because it is often described loosely: a split loan is not two separate loans, it is one loan package structured into two components.
The reason most people split is to manage exposure to interest rate movements. The fixed portion is insulated from rate rises for the term of the fix, which fixes a known repayment over that slice of the debt. The variable portion stays exposed to the cash rate — up and down — but keeps the flexibility a fully fixed loan gives up. Splitting is not a way to beat the rate cycle; it is a way to decide how much of your repayment you want certain and how much you want flexible.
Weighing the structure: what you gain and what you give up
The split exists to balance two things lenders normally make you choose between.
- Certainty on part of the debt. The fixed component locks the rate on its share of the loan, so a rate rise only flows through to the variable portion. That is the security side of the structure.
- Flexibility on the rest. The variable component is where the useful features usually live — extra repayments without penalty, redraw, and offset. An offset account against the variable portion can reduce the interest you pay while keeping the funds accessible. It also lets you benefit if variable rates fall.
- Room to use the variable market. Lenders compete hard on variable pricing, and the comparison rate is the tool that lets you weigh those products against each other rather than relying on the headline rate alone.
The trade-offs are real and worth understanding before you commit.
- The fixed portion will not follow rates down. If variable rates fall, only the variable share benefits. The fixed component is doing the job you set it — holding steady — which cuts both ways.
- Break costs on the fixed portion. If your circumstances change or rates move enough to justify refinancing, breaking the fixed component can be expensive, and that cost can erode the benefit of leaving. Sometimes an incoming lender will contribute toward break costs to win the business; that is a negotiation, not a given.
- More fees, more moving parts. Establishment and ongoing fees can apply to both components, and running two accounts inside one loan means more variables to weigh when you choose products and structure the application.
Setting the split and how it is structured
The ratio is yours to set — 50/50, 80/20, or anything that fits. The right split follows your financial position and how much rate certainty you actually want, not a rule of thumb. Most lenders allow a loan to be divided several times, often up to around four splits, with a minimum split amount that varies by lender (commonly in the region of $20,000). Each split distributes interest rate movement across your debt differently, so the structure should be chosen deliberately rather than defaulted to.
A guarantor can sit behind a split loan in the same way it can behind a standard home loan. With an acceptable guarantor, many lenders will lend up to 100% of the property value — sometimes higher to cover costs such as stamp duty — and a number will waive Lenders Mortgage Insurance, though neither outcome is automatic and both depend on the individual lender's policy and your full circumstances.
The deciding question is rarely "is a split loan good or bad." It is how the fixed and variable portions, the offset, and the break-cost exposure should be set against your plans for the property and your income over the fix period — and which lender's policy structures that cleanly. That is the part worth mapping properly. Book a strategy session and we will work through how a split should be built around your circumstances.
General information only — not personal financial product or credit advice. Lending is subject to each lender's policy, your full circumstances and responsible-lending assessment. Whether to fix, split or stay variable depends on your own objectives — consider seeking advice from your licensed financial adviser on suitability. AeFin is an Australian Credit Representative (CR 464548) of Finsure (ACL 384704).