Avoid These 5 Fixed Rate Mistakes on Investment Loans

Locking In Without Understanding Break Costs

Fixed rate break costs are calculated on the difference between your locked rate and the lender's current wholesale funding cost for the remaining fixed term. If the lender can only re-lend your money at a lower rate than you are paying, you cover the shortfall when you exit early.

Consider an investor who fixes a loan for three years at 6.2 per cent on a rental property near The Cove in Secret Harbour. Eighteen months later, wholesale rates have dropped and they want to sell or refinance. The break cost might run to several thousand dollars because the lender loses margin on the early exit. The formula uses the difference in rates, the remaining fixed period, and your outstanding balance. Lenders are required to provide an estimate before you confirm a discharge or switch, but the calculation surprises many property owners who assumed a modest exit fee.

Break costs work both ways. If rates have risen since you fixed, there is typically no penalty because the lender can re-lend the funds at a higher margin. That asymmetry catches borrowers who fix during a rate rise cycle and then find themselves locked in when rates begin to fall again.

Choosing a Fixed Term That Does Not Match Your Investment Strategy

A fixed term should align with how long you intend to hold the property and what you expect rates to do during that window. Fixing for five years on a property you plan to sell in two creates unnecessary exposure to break costs. Fixing for one year when you want certainty over a longer holding period means you will be back negotiating a new rate before your strategy has time to mature.

Secret Harbour has seen steady rental demand tied to its proximity to Rockingham and the rail extension to Mandurah, which makes it attractive for investors buying units near the foreshore or houses in estates like Paperbark Drive. If you are buying a townhouse to hold through to the end of the foreign investment ban in mid-2029, a three-year fixed term ending around that date might suit. If you are planning a land-and-build strategy or expect to leverage equity for another purchase within two years, a shorter fixed period or a split structure might offer more flexibility.

Investment holding periods often shift. The new negative gearing quarantine takes effect from July 2027 for properties acquired after May 2026, so many Secret Harbour investors buying now are weighing whether to lock in deductions under the old rules during the transitional period or to target eligible new builds that retain full negative gearing. Your fixed term needs to account for those decision points, not just the interest rate on the day you settle.

Fixing the Entire Loan and Losing Offset and Redraw Access

Most lenders do not allow offset accounts on the fixed portion of an investment loan, and redraw on fixed splits is often restricted or unavailable. When you fix the full loan amount, any surplus cash you want to park against the debt has nowhere to go except a separate savings account where it earns taxable interest instead of reducing non-deductible interest.

In our experience, investors who fix 100 per cent of an investment loan regret it within twelve months because they have no capacity to make lump-sum payments without triggering partial prepayment penalties, and they cannot access redraw if the property has an unexpected repair bill or a vacancy period. A split loan structure, where part of the loan is fixed and part remains variable, preserves access to offset and redraw on the variable portion while still providing rate certainty on the fixed component.

For example, fixing 60 per cent of the loan and leaving 40 per cent variable lets you direct any surplus rental income or savings into an offset account linked to the variable split. That keeps the funds accessible and reduces the interest charged on the variable portion. The fixed portion delivers certainty on the majority of the debt, and the variable portion provides flexibility for extra repayments, offset parking, or early exit without penalty.

Ignoring Interest-Only Availability on Fixed Investment Loans

Not all lenders offer interest-only periods on fixed rate investment loans, and those that do often impose shorter maximum terms or higher rates than their variable interest-only products. If your investment strategy relies on maximising cash flow and claiming the full interest deduction, you need to confirm that your chosen lender supports interest-only on the fixed term you want.

Interest-only periods are typically approved for one to five years at a time, and many lenders will revert the loan to principal and interest at the end of that term unless you apply for an extension. If you fix for three years and take interest-only for the same period, the loan structure aligns. If you fix for five years but the lender will only approve interest-only for three, you will be forced onto principal and interest repayments while still locked into the fixed rate, which reduces the tax efficiency of the loan and increases your monthly outgoing.

Some lenders also price fixed interest-only investment loans at a margin above fixed principal and interest rates, which erodes the benefit of fixing in the first place. Before committing to a fixed term, confirm the interest-only availability, the maximum period, and whether there is a rate loading. If the loading is significant, you may be better off on a variable interest-only loan and using the rate difference to build a buffer in offset.

Failing to Compare Portability and Top-Up Rules Across Lenders

Portability refers to the ability to move your fixed rate loan to a different security without breaking the fixed term. If you sell your Secret Harbour investment property and buy another before the fixed period expires, some lenders will allow you to transfer the loan to the new property at the same fixed rate and term. Others will treat the transaction as a discharge and refinance, triggering break costs on the old loan and requiring a new application for the new property.

Top-up rules govern whether you can increase the loan amount during the fixed term. If property values rise and you want to access equity to fund a second investment, most lenders will allow a top-up but only on a separate variable loan or a new fixed rate at current pricing. The original fixed portion remains untouched. A small number of lenders permit a blended rate increase, where the additional borrowing is added to the fixed loan at a weighted rate, but this is uncommon and usually requires the property to be re-valued and serviceability to be re-assessed.

Secret Harbour median dwelling values have increased over the past few years, driven by the area's family appeal and proximity to Waikiki Beach and the Secret Harbour Marina. Investors who locked in a fixed rate on a lower loan amount may want to access that equity without breaking the fixed term. Understanding each lender's portability and top-up policy before you fix can save you thousands in break costs and give you the flexibility to grow your portfolio while still holding rate certainty on your foundation loan. If you are likely to move properties or leverage equity within the fixed term, make portability and top-up terms part of your lender comparison, not an afterthought.

Fixed rate investment loans can provide stability and predictable cash flow, but only when the features align with your actual investment timeline and strategy. Secret Harbour investors buying established dwellings before the foreign investment ban lifts, or targeting new builds to retain negative gearing rights, should review fixed terms, break cost mechanics, split structures, interest-only availability, and portability rules before locking in. Call one of our team or book an appointment at a time that works for you.

Frequently Asked Questions