The classic dilemma for home loan borrowers: do you fix your rate for security, or stay variable for flexibility? For many Australians, the answer is neither — or rather, both. A split home loan lets you divide your borrowing between a fixed rate portion and a variable rate portion, giving you a blend of certainty and flexibility that neither option alone can provide.
What Is a Split Home Loan?
A split loan divides your mortgage into two (or sometimes more) separate portions: one with a fixed interest rate and one with a variable rate. You choose how much to allocate to each — for example, 60% fixed and 40% variable. Each portion operates independently, with its own rate, repayment schedule, and features.
Benefits of a Split Loan
Rate certainty on part of your debt — The fixed portion gives you a guaranteed repayment amount for the fixed term, making budgeting easier and protecting you from rate rises on that portion.
Flexibility on the variable portion — The variable portion allows you to make unlimited extra repayments, use an offset account, and benefit from rate cuts as they occur.
Limited break costs — If you need to exit the loan (e.g. to sell or refinance), break costs only apply to the fixed portion. Having a variable component limits your exposure.
Hedge against rate uncertainty — If rates rise, you’re partially protected. If rates fall, you partially benefit. A split loan is essentially a hedge against getting the rate decision wrong.
How Do You Decide the Split Ratio?
There’s no single right answer — the optimal split depends on your financial goals, risk tolerance, and the current rate environment. Common approaches include:
50/50 split — Equal exposure to both fixed and variable. Simple and balanced.
Higher fixed (e.g. 70/30) — More certainty if you’re concerned about rate rises or are on a tight budget. Less ability to benefit from rate cuts or make large extra repayments.
Higher variable (e.g. 30/70) — More flexibility and offset/redraw capability. Less protection if rates rise significantly.
Your mortgage broker will model the financial impact of different scenarios to help you determine the right balance.
Split Loans for Investors
Property investors often use split loans strategically — for example, fixing the portion of investment debt they’re comfortable holding long-term (providing cost certainty for property holding calculations) while keeping a variable portion that they can reduce if rental income exceeds expectations, or draw on if needed for another purchase.
Things to Watch Out For
Some lenders charge higher fees for split loan structures, or have minimum amounts for each portion. Offset accounts typically only apply to the variable portion. And of course, break costs still apply to the fixed component if you exit early — so clarity on your plans for the next few years is important before committing to a fixed split.
Let Assembly Finance Model Your Split Options
We regularly help clients model different fixed/variable split ratios and compare lenders offering the best split loan structures. It’s one of those decisions where the numbers really matter — and getting it right can save you thousands. Contact James for a free split loan consultation.
