A fixed interest rate gives you payment certainty, but most lenders disable the offset account on the fixed portion.
That leaves first home buyers choosing between predictable repayments and the tax-free benefit of parking savings against their loan. You don't have to choose one or the other. A split loan structure lets you fix part of your borrowing while keeping an offset account attached to the variable portion.
Why lenders disable offsets on fixed rate loans
Lenders price fixed rate products by locking in their own funding cost for the fixed period. An offset account reduces the interest you pay, which creates a mismatch between what the lender earns and what they've committed to pay their wholesale funding provider. To avoid that risk, most lenders simply turn off the offset feature on any fixed portion of your loan.
Consider a buyer purchasing in Mount Eliza who fixes the full loan amount at a competitive fixed rate. If they later receive a tax refund or bonus and deposit it into their account, that cash earns standard savings interest instead of offsetting the mortgage. The difference in after-tax value can be significant, particularly for buyers in higher tax brackets.
How a split structure gives you both certainty and offset benefits
You can divide your total borrowing into two portions: one fixed, one variable. The fixed portion delivers stable repayments. The variable portion allows full offset account access, so any balance in that account reduces the interest charged daily.
In a scenario where a first home buyer on the Mornington Peninsula borrows under the Australian Government 5% Deposit Scheme and splits 60% fixed and 40% variable, they lock in repayments on the majority of the debt while retaining the ability to offset savings against the variable portion. If they hold a regular savings buffer of several thousand dollars, that amount reduces the loan balance used to calculate daily interest on the variable portion, delivering a compounding tax-free return.
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Choosing the right split percentage for your situation
The right split depends on how much cash flow certainty you need and how much you expect to hold in your offset account. If you're building savings gradually after settlement, a higher variable portion makes sense. If your income is irregular or you prefer fixed budgeting, a larger fixed portion provides stability.
Buyers who receive the Victorian first home buyer duty exemption or concession and purchase in Dromana or Rosebud often use the stamp duty saving to build an offset buffer from day one. In that case, a 50/50 split or even a 40% fixed and 60% variable structure can deliver better long-term value than fixing the entire loan amount, provided you maintain a consistent offset balance.
Fixed rate break costs and why flexibility matters
If you need to exit a fixed rate loan early, whether due to sale, refinance, or a lump sum repayment, most lenders apply a break cost. This is calculated based on the difference between your fixed rate and the lender's current cost of funds for the remaining fixed period. In a falling rate environment, break costs can reach many thousands of dollars.
A split structure reduces your exposure. If you fix half your loan and later decide to refinance or sell, the break cost applies only to the fixed portion. The variable portion can be repaid or refinanced without penalty. For first home buyers on the Peninsula who may upsize or relocate as their circumstances change, this flexibility is worth considering at the outset.
What happens to the offset account when your fixed period ends
When the fixed term expires, that portion of your loan reverts to a variable rate unless you choose to refix. At that point, most lenders allow you to activate an offset account on the previously fixed portion, or you can consolidate both portions under a single variable loan with one offset account.
You're not locked into the original split structure permanently. You can adjust the ratio when you refix, move the entire balance to variable, or split it differently based on your current needs and the interest rate environment at the time. This gives you a decision point every few years rather than committing to a single structure for the life of the loan.
Does a split loan cost more in fees
Most lenders treat a split loan as a single facility with two portions, so you typically pay one application fee, one settlement fee, and one annual package fee if applicable. Some lenders charge a small additional fee for managing two loan accounts, but this is uncommon among the major banks and many second-tier lenders.
You will make two separate repayments each month, one for the fixed portion and one for the variable portion, unless you arrange a single consolidated payment through your lender. The administrative difference is minor, and the financial benefit of retaining offset access usually outweighs any small increase in account-keeping fees.
Offset versus redraw on the variable portion
An offset account is a separate transaction account. The balance sits in your name, remains accessible at any time, and reduces the interest calculated on your loan without technically being part of the loan itself. A redraw facility, by contrast, allows you to withdraw extra repayments you've made into the loan, but the lender controls access and can restrict or remove redraw at their discretion.
For first home buyers using a split structure, an offset account on the variable portion is the preferred option. It provides unconditional access to your savings, keeps those funds separate from the loan for legal and tax purposes, and delivers the same interest saving as making extra repayments without locking the cash away. If you're applying under the Australian Government 5% Deposit Scheme, confirm with your participating lender whether offset accounts are included in their product suite, as not all lenders offer this feature on low-deposit loans.
Call one of our team or book an appointment at a time that works for you. We'll structure your application to suit your cash flow, compare lenders that support split loans with offset accounts, and walk you through the exact numbers based on your deposit and the property value in your target suburb.
Frequently Asked Questions
Can I have an offset account on a fixed rate home loan?
Most lenders disable offset accounts on fixed rate portions because the offset reduces interest income in a way that conflicts with the lender's fixed funding cost. You can access an offset account by splitting your loan between fixed and variable portions and attaching the offset to the variable portion.
What is a split loan structure?
A split loan divides your total borrowing into two portions, typically one fixed and one variable. You can choose the percentage allocated to each portion, allowing you to lock in repayment certainty on part of the loan while retaining offset access and repayment flexibility on the rest.
Do I pay extra fees for a split loan?
Most lenders treat a split loan as a single facility with two portions, so you usually pay one application fee and one settlement fee. Some lenders charge a small additional account-keeping fee, but this is uncommon among major banks and many second-tier lenders.
What happens when the fixed period ends on a split loan?
When the fixed term expires, that portion reverts to a variable rate unless you choose to refix. At that point, you can activate an offset account on the previously fixed portion, consolidate both portions under one variable loan, or adjust the split ratio based on your current needs.
Can I use a split loan structure with the Australian Government 5% Deposit Scheme?
Yes, split loan structures are generally available through participating lenders under the 5% Deposit Scheme. You should confirm directly with your chosen lender whether they offer offset accounts on the variable portion, as product features vary across the participating lender panel.
