Interest Rates and When to Lock In Your Position

Your interest rate decision shapes how much capital you retain for future investments.

Professionals building property portfolios face a recurring question: should you fix your rate, stay variable, or split your loan structure? The answer depends on what you're protecting against and what you're optimising for. If your priority is preserving cash flow to fund the next acquisition, a fixed rate provides certainty. If you value flexibility and the ability to make extra repayments without restriction, a variable rate keeps your options open. A split loan combines both approaches, which works when you want partial protection while maintaining room to reduce debt faster.

Variable Rate Home Loans: Flexibility With Exposure

A variable interest rate moves with the market, which means your repayments adjust whenever lenders change their pricing. You pay more when rates rise and less when they fall. This structure suits investors who want to make extra repayments without penalty, access offset accounts, and retain the ability to refinance or pay down debt ahead of schedule. Variable rates also allow you to take advantage of rate cuts without waiting for a fixed term to expire.

Consider a professional holding two investment loans on properties in Subiaco and Nedlands. If both loans are on variable rates with linked offset accounts, rental income and surplus salary can sit in those offset accounts, reducing the interest charged daily. Over a twelve-month period, even $40,000 sitting in offset can reduce interest costs by several thousand dollars, depending on the loan amount and current variable rate. That capital stays accessible while reducing your debt cost.

The risk is exposure to rate increases. If the Reserve Bank lifts the cash rate, your repayments climb. For someone servicing multiple properties, a 0.50% increase across a $1.2 million portfolio can mean an additional $500 per month in repayments. Variable loans work when you have surplus income, strong cash reserves, or expect rates to stabilise or fall.

Fixed Interest Rate Home Loans: Locking In Certainty

A fixed interest rate holds your repayment amount steady for a set period, typically between one and five years. This structure protects you against rate increases during the fixed term, which makes budgeting predictable and shields your cash flow from volatility. The limitation is that most fixed rate products restrict extra repayments, usually capping them at $10,000 to $30,000 per year depending on the lender. If you want to pay down debt aggressively or sell the property, break costs can apply.

Break costs are the lender's calculation of lost interest when you exit a fixed rate early. If you fixed at 5.5% and market rates drop to 4.8%, the lender loses the difference over the remaining term. They pass that cost to you. These fees can reach tens of thousands of dollars on large loans, which makes fixed rates less suitable for properties you might sell or refinance within the fixed period.

Fixed rates suit professionals with stable income who want to remove repayment uncertainty while they focus on growing other parts of their portfolio. They also work when market commentary suggests rates are likely to rise and you want to lock in current pricing before that occurs.

Split Loan Structures: Balancing Protection and Control

A split loan divides your borrowing into two portions: one fixed, one variable. You might allocate 60% of the loan to a fixed rate and 40% to a variable rate with an offset account. This gives you repayment certainty on the majority of your debt while preserving flexibility on the remainder. The variable portion allows extra repayments, offset functionality, and the ability to capitalise on rate cuts without breaking a fixed term.

In a scenario where a lawyer purchases an owner-occupied property in South Perth for $950,000 with a 20% deposit, the loan amount is $760,000. Splitting that into $450,000 fixed and $310,000 variable means the fixed portion provides stable repayments, while the variable portion allows her to direct bonuses and surplus income into an offset account. If she receives a $60,000 annual bonus, parking that in offset reduces interest on the variable portion while keeping the funds accessible. Over three years, this approach reduces total interest paid compared to fixing the entire amount, and she retains the ability to pay down debt without penalty.

Split loans require more active management than a single product, but they suit professionals who want to hedge against rate movements while retaining room to accelerate repayment. The split ratio can be adjusted at the time of application based on your cash flow, income stability, and portfolio goals.

Loan to Value Ratio and How It Affects Your Rate

Your loan to value ratio (LVR) is the percentage of the property value you're borrowing. A lower LVR usually unlocks lower rates because the lender's risk is reduced. If you're borrowing 70% of the property value, you'll typically access pricing that's 0.10% to 0.30% lower than someone borrowing 90%. This difference compounds over the life of the loan, so a larger deposit doesn't just reduce your loan amount, it also reduces your cost of borrowing.

Lenders Mortgage Insurance (LMI) applies when your LVR exceeds 80%, and this premium is a one-time cost that can range from a few thousand to over $30,000 depending on the loan amount and LVR. Some professionals choose to pay LMI to retain capital for additional purchases, while others wait to reach an 80% LVR to avoid the cost entirely. Both approaches are valid depending on your timeline and acquisition strategy.

If you're looking to improve borrowing capacity for future purchases, lowering your LVR on existing properties through extra repayments or capital growth can increase your serviceability for the next loan.

Interest Only Versus Principal and Interest Repayments

Interest only repayments mean you pay only the interest charged each month, without reducing the loan balance. This keeps repayments lower, which improves cash flow and allows you to redirect capital toward other investments or offset accounts. Interest only terms are typically approved for one to five years, after which the loan reverts to principal and interest unless you negotiate an extension.

This structure suits investors who want to maximise tax deductions on investment properties, as interest is deductible against rental income. It also works when you expect capital growth to build equity without needing to pay down the loan manually. The downside is that your loan balance doesn't reduce, so you're not building equity through repayment. If property values stagnate, you remain at the same LVR.

Principal and interest repayments reduce your loan balance with each payment, which builds equity and lowers your LVR over time. This improves your ability to borrow again and reduces total interest paid over the loan term. For owner-occupied properties or investors focused on debt reduction, principal and interest is the standard approach.

Choosing between the two depends on whether you're prioritising cash flow and tax efficiency or debt reduction and equity growth. Many professionals use interest only on investment properties and principal and interest on their owner-occupied home loans, separating the strategies based on the asset type.

Rate Discounts and How to Access Them

Published rates are starting points, not final offers. Most lenders provide interest rate discounts based on loan size, LVR, and whether you're a new or existing customer. A discount of 0.20% to 0.80% is common for loans above $500,000 with an LVR below 80%. These discounts are negotiated at the time of application or during refinancing.

Working with a broker gives you access to multiple lenders and their discount structures, which means you're comparing actual rates rather than advertised rates. Some lenders also offer professional packages for doctors, accountants, and lawyers, which include additional rate reductions and fee waivers. If you're refinancing or applying for a new loan, comparing these packages across lenders can reduce your rate and ongoing costs.

A loan health check can identify whether your current rate is still aligned with market pricing or whether refinancing would deliver a lower cost.

Call one of our team or book an appointment at a time that works for you to discuss which loan structure and rate type aligns with your portfolio strategy and cash flow requirements.

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