A split home loan divides your total loan balance between a fixed rate component and a variable rate component within the same loan from the same lender. The fixed portion provides payment certainty and protection from rate increases; the variable portion preserves access to an offset account, unlimited extra repayments and the ability to benefit from any future rate reductions. For many Australian borrowers, a split loan represents the most balanced approach to managing interest rate risk.
What a Split Home Loan Is and How It Works
When you take out a split home loan, your lender creates two sub-accounts: one for the fixed portion and one for the variable portion. Both are secured against the same property and appear on your mortgage statement. You make separate repayments against each component, or in some cases a combined repayment that the lender allocates between the two sub-accounts.
The fixed component carries all the standard fixed rate conditions: the rate is locked for the chosen term, extra repayments are typically capped (often $10,000–$30,000 per year), and break costs apply if you exit early. The variable component functions exactly like a standalone variable loan: full offset account, unlimited extra repayments, redraw facility and no exit fees.
Offset Only Applies to the Variable Portion
Your offset account is linked only to the variable component of the split loan. If you have a $500,000 loan split 60% fixed ($300,000) and 40% variable ($200,000), your offset balance reduces interest only on the $200,000 variable component — not the $300,000 fixed component. Factor this into your offset account strategy.
Choosing the Right Split Ratio for Your Circumstances
There is no universally correct split ratio — it depends on how much certainty you need vs how much flexibility you want. Common splits in Australia are 50/50, 60/40, and 70/30 (fixed/variable). A borrower with a tight budget who needs payment certainty might choose 70-80% fixed; a borrower with significant savings to park in an offset and high income might lean toward 60-70% variable.
Consider: how much do you have (or expect to have) in your offset account? If you maintain $80,000 in an offset and your variable component is only $150,000, the offset is highly effective relative to the variable balance. If the variable component were $300,000, the offset's proportional impact would be smaller — suggesting a higher variable ratio may be better.
- ✓50/50 — balanced certainty and flexibility, popular with first home buyers
- ✓60% fixed / 40% variable — more certainty, moderate offset benefit
- ✓70% fixed / 30% variable — maximum certainty, limited but useful offset access
- ✓40% fixed / 60% variable — more flexibility, good for borrowers with high offset balances
When a Split Loan Makes the Most Sense
A split loan works best when you are genuinely uncertain about the rate direction and do not want to commit fully to either fixed or variable. If you believe rates will fall significantly — as many did in 2024 — going fully variable captures more benefit. If you believe rates will rise — as was the case in 2022–2023 — fixing captures more protection. When the outlook is uncertain, a split acknowledges the uncertainty and manages both risks simultaneously.
Split loans are also useful for budgeting-sensitive borrowers: knowing that at least half (or two-thirds) of your loan has stable, predictable repayments makes financial planning more manageable. This is especially relevant for households on single incomes or those managing other significant financial commitments.
Review Your Split Before the Fixed Period Ends
Set a calendar reminder six weeks before your fixed period expires. The loan will revert to the lender's standard variable rate (typically higher than the discounted variable rate) on the anniversary date. Review your options — refix, convert to fully variable, or refinance — well before this happens.
Frequently Asked Questions
About the Author
Sakib Manzoor
Senior Finance Wellness Expert
Sakib Manzoor is the founder of Secure Finance and brings extensive experience in Australian mortgage broking and financial wellness. Specialising in helping clients achieve their property finance goals through personalised strategies and expert guidance, Sakib is FBAA accredited and committed to providing clear, actionable advice. All content is written to meet Australian regulatory standards and is regularly updated to reflect current market conditions.