How to Use Fixed Rate Loans and Offset Accounts

Can You Have an Offset Account on a Fixed Rate Home Loan?

Most lenders in Australia do not offer offset accounts on fixed rate home loans. A small number of lenders allow what's called a linked offset, but the offset benefit is either significantly restricted or comes with a higher fixed rate than the equivalent loan without offset functionality.

The reason comes down to how lenders fund fixed rate loans. When a lender offers you a fixed rate, they lock in their own funding cost for that period through wholesale markets. If you then reduce the balance earning interest by parking funds in an offset account, the lender's funding cost remains fixed while their interest revenue falls. That creates a mismatch lenders aren't willing to carry at standard pricing.

In our experience working with self-employed borrowers and professionals across Woollahra, this limitation catches people off guard. Many assume that because their current variable rate loan has a full offset, a fixed rate loan will work the same way. It doesn't.

How a Linked Offset Works on a Fixed Rate Loan

A linked offset on a fixed rate loan typically offsets only a portion of your balance, commonly capped at 40% to 60% of the loan amount. The rest of the loan continues to accrue interest at the fixed rate regardless of how much you hold in the offset account.

Consider a borrower who fixes $800,000 at 5.8% with a 40% linked offset cap. If they maintain $200,000 in the offset account, only $200,000 of the loan balance is offset. The remaining $600,000 still accrues interest at 5.8%. Compare that to a variable loan with a full offset at 6.1%, where the entire $800,000 loan would be offset if they held $200,000 in the account, leaving $600,000 accruing interest. The fixed loan provides rate certainty, but the offset benefit is weaker.

Linked offset products also come with a rate premium. The fixed rate on a loan with even a partial offset is typically 0.15% to 0.30% higher than the equivalent fixed rate without offset. That premium erodes some of the benefit before you've even deposited a dollar.

Why Most Borrowers in Woollahra Choose a Split Loan Instead

A split loan structure divides your total borrowing between a fixed portion and a variable portion. The variable portion can be paired with a full offset account, and the fixed portion locks in your rate on the balance you want protected from rate rises.

In a scenario like this, a couple purchasing a terrace in Paddington might borrow $1,200,000 and split it 50/50: $600,000 fixed at 5.7% for three years, and $600,000 variable at 6.0% with a full offset. They keep $150,000 in the offset account from rental income and savings. The offset applies fully to the $600,000 variable portion, reducing the interest-accruing balance to $450,000. The fixed portion remains untouched at $600,000, giving them rate stability on half the loan while preserving full offset flexibility on the other half.

This structure is particularly useful for self-employed borrowers and professionals who receive irregular income, such as annual bonuses, commissions or contract payments. The offset account on the variable portion lets them reduce interest costs whenever cashflow is strong, without giving up the certainty a fixed rate provides on the other half of the loan. You can adjust the split ratio to suit your priorities: 70% fixed and 30% variable if you want more protection, or 30% fixed and 70% variable if you want more offset benefit and flexibility.

You can read more about split loan structures and how to set the right ratio on our fixed rate expiry page.

The Trade-Off Between Rate Certainty and Offset Flexibility

Locking in a fixed rate means giving up the features that come with a variable loan. No offset, no ability to make unlimited extra repayments, and no option to redraw those funds without penalty in most cases. The fixed rate protects you from rate rises, but it also removes the tools you'd normally use to manage your loan balance actively.

For owner-occupiers with stable income and minimal savings buffer, a fully fixed loan can make sense. You know exactly what your repayment will be for the fixed period, and there's no offset benefit to give up because you don't have surplus funds sitting idle.

For borrowers with variable income, savings they want to preserve as a buffer, or an expectation of receiving lump sums during the fixed period, losing offset functionality is a material cost. Parking $100,000 in a savings account earning 4.5% while paying 5.8% on a fixed loan means you're still paying a net 1.3% on that $100,000. On a variable loan with offset, that $100,000 would save you the full variable rate.

This is where a split structure works well for professionals in Double Bay, Woollahra and Bellevue Hill who might receive year-end bonuses, dividends from a family trust, or sale proceeds from an investment. The variable portion with offset gives them somewhere to park those funds and reduce interest immediately, while the fixed portion still locks in protection on the majority of the loan.

What Happens to Your Offset Account When Your Fixed Rate Ends

When your fixed rate period ends, the loan automatically reverts to the lender's standard variable rate unless you negotiate a new fixed term or refinance. At that point, you can request to add a full offset account to the loan if the lender offers it on their variable products.

Most lenders will allow you to link an offset account once the loan moves to a variable rate, but it's not automatic. You need to apply for the offset feature, and some lenders charge a small annual fee for offset accounts, typically $200 to $400 per year. If you're planning to revert to variable and want offset functionality from day one, speak to your broker before the fixed period ends so the offset account is ready to activate on the reversion date.

If you fixed the entire loan balance and now want to move part of it to variable with offset while fixing the rest again, that's a restructure. The lender will treat it as a partial refinance of your existing loan. Some lenders allow this without cost, others charge a small establishment fee. It's worth checking your options at least 90 days before your fixed rate expires so you're not forced into the lender's standard variable rate while you sort out the structure.

Should You Fix Part of Your Loan or Keep It All Variable with Offset?

The answer depends on how much rate protection you want and how much surplus cashflow you expect to hold during the next few years. If you're confident you'll have $50,000 or more sitting in offset most of the time, keeping that portion on variable with offset will likely save you more in interest than the protection a fixed rate provides, particularly if variable rates fall.

If your cashflow is tight and you're not holding significant savings, the offset benefit is minimal and the fixed rate offers more value by locking in your repayment and protecting you from further rate rises. At current variable rates, the gap between variable and fixed is narrow, so the cost of fixing is lower than it has been in recent years.

For investment loans, offset accounts are particularly valuable because they let you keep your salary, rent and other income in the offset account without mixing it with the investment loan. That keeps your interest deduction clean for tax purposes while still reducing the interest you pay. Fixing an investment loan removes that flexibility, which is why many investors either stay fully variable with offset or use a split structure to preserve some offset capacity.

If you're weighing up whether to fix, and you already have home loan pre-approval, the lender can model both structures for you with repayment estimates and projected interest costs over different timeframes. That gives you a clearer picture of the dollar impact rather than just comparing rates.

Call one of our team or book an appointment at a time that works for you. We'll walk through your current loan structure, your cashflow pattern, and whether a fixed rate, variable with offset, or split loan makes sense for where you're at right now.

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