Unlock the secrets to fixed, variable & split investment loans

The rate structure you choose for an investment property loan affects more than your monthly repayment.

It shapes how much interest you can claim, how quickly you respond to rate movements, and how much flexibility you keep for future portfolio decisions. For property investors in Hillarys, where the median unit price sits around the mid-$400,000s and houses trade closer to $800,000, the difference between fixed, variable and split structures can mean thousands of dollars in claimable interest and very different cash flow outcomes over a five-year hold.

Variable Rate Investment Loans: Full Flexibility with Full Exposure

A variable rate investment loan adjusts when the lender changes its rates. You pay more when rates rise and less when they fall, and you keep access to offset accounts, redraw facilities and unlimited extra repayments without penalty.

In our experience, investors who plan to use equity for a second property within two to three years prefer variable structures because they need the ability to redraw or refinance without break costs. Consider an investor who purchased a two-bedroom villa in the Whitfords Avenue precinct on a variable interest-only loan. Within 18 months the property gained equity, and because the loan sat on a variable rate, the investor could refinance to release that equity and fund a deposit on a second property in Padbury without paying a cent in break fees. That flexibility carried a cost during the rate rises, but it kept the door open for the next purchase when the opportunity appeared.

Variable rates also suit investors who have irregular income or expect lump sums they want to park in an offset account. Rental income, bonuses and business distributions can sit in offset and reduce the interest charged daily, which in turn increases the deductible interest component relative to a loan without offset.

Fixed Rate Investment Loans: Predictable Interest with Limited Movement

A fixed rate locks your interest rate for a set term, typically one to five years. Your repayment stays the same regardless of market movements, and your claimable interest expense remains predictable across that period.

Fixed rates remove offset accounts and cap extra repayments, usually to around $10,000 per year depending on the lender. Breaking a fixed loan early triggers break costs, calculated on the difference between your fixed rate and the lender's current wholesale funding cost for the remaining term. If rates have fallen since you fixed, the break cost can run into the tens of thousands.

Investors who fix usually do so because they want certainty over deductions or because they believe rates will rise and want to lock in a lower cost of debt. The risk is that you lose the ability to move quickly if your circumstances change or if a refinance opportunity emerges with a lower rate or different loan features. That trade-off matters more in a portfolio context than it does for an owner-occupier, because investors typically refinance or restructure more frequently as they acquire additional properties.

Split Loan Structures: Dividing Risk Across Two Products

A split loan divides your borrowing between fixed and variable portions, typically 50/50 or 60/40 depending on your priorities. Each portion operates independently with its own rate, features and repayment terms.

The variable portion keeps your offset account, redraw facility and flexibility to make lump sum payments or refinance without penalty. The fixed portion locks in part of your interest expense and shields you from rate rises on that segment. If rates climb, the fixed portion protects half your borrowing. If rates fall, the variable half benefits immediately and you can refinance the fixed portion at the end of its term without a full break cost.

Consider an investor borrowing $640,000 to purchase a house near Hillarys Boat Harbour. They split the loan 50/50: $320,000 fixed for three years at the time of writing, and $320,000 variable with a linked offset account. Rental income and any other cash flow parks in the offset, reducing the interest charged on the variable portion. The fixed portion delivers a known deduction for the first three years, which simplifies tax planning and budgeting. At the end of the fixed term, the investor can refix, convert to variable, or refinance that portion depending on where rates have moved and whether they plan to acquire another property.

Split structures add complexity because you manage two loans with different terms and different lender requirements, but for investors building a portfolio the structure offers a middle path between full exposure and full lock-in.

Interest-Only Repayments and Investment Loan Structure

Most investment loans in Hillarys are written on an interest-only basis for the first one to five years, then revert to principal and interest unless you extend the interest-only term or refinance. Paying interest only maximises your deductible expense and keeps your repayment lower, which improves cash flow if the rental income doesn't fully cover the loan cost.

Interest-only terms are available on variable, fixed and split loans, so the choice of rate structure is separate from the choice of repayment type. You can fix an interest-only loan, split an interest-only loan, or leave it fully variable while paying interest only. The structure you choose should reflect how you plan to manage the loan and whether you need flexibility or certainty over the interest-only period.

Rental vacancy in the Hillarys area tends to sit below 2 per cent, so most investors achieve consistent rental income, but even a four-week vacancy between tenants can stretch cash flow if your repayment is high. Keeping the loan interest-only and the rate structure flexible gives you room to manage those gaps without needing to find principal repayments during a void period.

How the New Tax Rules Affect Rate Structure Decisions

From 1 July 2027, net rental losses on residential investment properties purchased after 7:30pm on 12 May 2026 can only be offset against other residential rental income or carried forward. They can no longer be offset against salary or business income unless the property is an eligible new build.

Properties purchased before that date, and properties under contract at 7:30pm on 12 May 2026, continue under the old rules and remain negatively geared in the traditional sense. That grandfathering makes the rate structure decision more important for investors who bought recently and plan to hold long term, because the interest deduction may be quarantined for years if the property runs at a loss.

For those investors, a variable rate with offset can reduce the amount of interest you actually pay, which lowers the paper loss and reduces the amount quarantined. For others, locking in a portion of the interest expense on a fixed rate gives certainty over the deduction, even if it can't be claimed against wages until the property turns a profit or is sold.

The tax change doesn't make one structure better than another, but it does mean the choice now sits inside a longer time horizon and a different planning conversation about when and how you'll use those losses.

Choosing a Structure That Fits Your Next Move

The right structure depends on what you plan to do after this purchase. If you're acquiring a second property within two years, a variable structure keeps your options open and avoids break costs when you refinance to access equity. If you're holding this property for ten years and have no plans to expand the portfolio, a split structure gives you some rate protection without locking everything down. If you're buying a new build and intend to rely on the deduction to offset other income under the new tax rules, the certainty of a fixed rate might suit your tax planning.

Talk through your next two or three moves with someone who understands how investment loan options layer into portfolio strategy, not just product features. The structure you choose today either opens doors or closes them, and the difference plays out over years, not months.

Call one of our team or book an appointment at a time that works for you.

Frequently Asked Questions