A fixed rate on an investment loan can lock in your borrowing cost for a set period, but whether that works in your favour depends entirely on your circumstances at the time you fix.
Investors at different stages of life face different risks. Someone buying their first rental property has a very different cash flow position to someone holding three properties and nearing retirement. The fixed rate decision needs to reflect that.
First Investment Property with a Tight Cash Flow
If you're taking on debt for the first time as an investor, cash flow predictability often matters more than chasing the lowest possible rate. A fixed rate gives you a known repayment figure for the fixed period, which can help if you're still adjusting to managing two mortgages or if rental income hasn't started yet.
Consider someone in Canning Vale who purchases a townhouse as their first investment while still paying off their home in Baldivis. They're borrowing at 80 per cent LVR, which means no LMI, but they're also stretched across two repayments. Fixing the investment loan at the time of settlement means they know exactly what the fortnightly cost will be for the next two or three years, regardless of what the Reserve Bank does. That certainty can make budgeting easier when you're not yet confident about how rental income will flow or what the actual holding costs will be once council rates, insurance and property management fees are included.
The downside is that if rates drop during the fixed period, you're locked in unless you're prepared to pay break costs. For a first-time investor with limited cash reserves, those break costs can be prohibitive. You also lose access to offset accounts on most fixed rate products, which means any surplus cash sitting in a transaction account isn't reducing your interest.
Mid-Career Investors Building a Portfolio
Once you own more than one investment property, your borrowing strategy usually shifts from protection to flexibility. At this stage, you're often looking to access equity, refinance to better rates, or restructure loans to fund the next purchase. Locking everything into fixed rates can limit your options.
In our experience, investors in this phase tend to split their loans rather than fix the whole amount. You might fix 50 or 60 per cent of the debt to smooth out some of the rate risk, then leave the rest variable so you can make extra repayments, redraw if needed, or refinance one portion without triggering break costs on the entire balance. This approach also keeps an offset account available on the variable portion, which is useful if you're accumulating a deposit for the next property or managing irregular income from rental vacancies.
A split structure does add some administrative load. You'll have two loan accounts per property instead of one, and each one may have different terms, rate review dates and repayment frequencies. But for investors who expect to act within the next few years, that complexity is usually worth it to avoid being locked in when opportunity or necessity requires a change.
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Pre-Retirement Investors Reducing Exposure
If you're within ten years of retirement and still holding investment property debt, your priority is usually debt reduction rather than portfolio growth. At this stage, a fixed rate can work against you unless the loan structure allows for significant extra repayments.
Most lenders cap additional repayments on fixed rate loans at around $10,000 to $30,000 per year without penalty. If you're planning to sell another asset, receive an inheritance, or redirect income from a maturing term deposit, those caps can become a real problem. You either pay the money onto the loan and trigger an early repayment fee, or you park the cash in a low-interest savings account and effectively subsidise the bank.
Variable rates give you unlimited repayment flexibility. If you're in a position to pay down debt quickly, that flexibility is often more valuable than the rate certainty a fixed term provides. The exception is if you're transitioning to a pension or part-time work and your income is about to drop. In that scenario, fixing for two or three years while you're still earning full income can give you breathing room as you adjust to a lower cash flow in early retirement.
How the New Tax Rules Affect the Fixed Rate Decision
From the 2027-28 income year, losses from established investment properties purchased after 12 May 2026 can only be offset against income from other residential properties, not against your salary or business income. Properties held before that date, and eligible new builds purchased after that date, are unaffected.
If you bought an established property after May 2026 and you're not generating rental income from other properties, you can no longer reduce your tax bill by negatively gearing that property. Your after-tax cost of holding the loan is now higher, which means rate certainty becomes more valuable. Fixing the loan removes one variable from an already tighter cash flow position.
For properties purchased before May 2026, or for new builds, the tax treatment hasn't changed and the fixed versus variable decision remains the same as it was previously. You're still weighing certainty against flexibility based on your own situation, not based on new legislation.
Interest-Only Fixed Rates for Investors Focused on Leverage
Most investment loans in Australia are written on an interest-only basis for the first one to five years, then revert to principal and interest. Fixing an interest-only loan reduces your repayment to just the interest component at a known rate for the fixed term.
This structure suits investors who want to maximise leverage and preserve cash flow for further acquisitions. The repayment is lower than principal and interest, which means more rental income is retained or more serviceability is available for the next loan. But once the interest-only period ends, the loan reverts to principal and interest and the repayment jumps significantly. If that reversion happens while you're still in a fixed rate period, you're locked into a higher repayment with no ability to refinance without break costs.
You need to know when the interest-only period expires and whether it aligns with the end of your fixed term. If they're mismatched, you either accept the repayment increase or pay to exit the fixed rate early. Both outcomes reduce the value of having fixed in the first place.
What Happens if You Need to Sell During a Fixed Term
Life changes. You might need to sell an investment property during a fixed rate period because of divorce, illness, job loss, or because the property is no longer performing. When you sell, the loan is discharged and the lender calculates a break cost based on the difference between your fixed rate and the current wholesale rate for the remaining term.
Break costs can run into the thousands, or even tens of thousands, depending on how far rates have moved and how much time is left on your fixed period. The lender doesn't waive these costs just because the sale is involuntary. Some lenders allow you to port a fixed rate loan to a new property, but that only works if you're buying another investment property at the same time, the new loan amount is similar, and the lender approves the new security.
If there's any chance you'll need to sell or significantly restructure within the next few years, a variable rate or a shorter fixed term reduces your exposure to break costs. Flexibility has a cost, but so does being locked in when circumstances force a change.
Splitting Loans Across Different Fixed Terms
Some investors fix portions of their loan for different terms rather than fixing the whole amount for the same period. You might fix $200,000 for two years and another $200,000 for four years, with the remainder on variable. This spreads your rate risk over time and gives you regular opportunities to reassess without unwinding the entire structure at once.
The downside is complexity. You're managing multiple rate expiry dates, and if you want to refinance the whole loan to a new lender, you'll need to calculate break costs on each fixed portion separately. Not all brokers or borrowers want that level of detail, but for investors with large loan balances and a hands-on approach, it can smooth out some of the volatility that comes with rate cycles.
Should You Fix Now or Wait
Timing a fixed rate decision based on predictions about future rate movements is difficult. If you wait for rates to drop before fixing, they might rise further. If you fix now and rates fall next month, you've locked in a higher cost.
The better question is whether you can manage a rate rise from current levels without financial stress. If a 1 per cent increase in your variable rate would force you to sell or default, fixing now removes that risk. If you have enough buffer to absorb rate movements and you value the flexibility to pay down debt or refinance, staying variable makes sense.
Fixed rates are about managing risk, not predicting outcomes. If the certainty helps you sleep, it's doing its job. If you're giving up flexibility you'll need in the next few years, it's probably the wrong choice regardless of where rates go.
If you're weighing up whether to fix part or all of your investment loan, or if your current fixed rate is about to expire, call one of our team or book an appointment at a time that works for you. We'll walk through your situation, your timeline, and the lending options available right now across the Australian market.
Frequently Asked Questions
Can I make extra repayments on a fixed rate investment loan?
Most lenders allow extra repayments of $10,000 to $30,000 per year on fixed rate loans without penalty. Amounts above that cap may trigger early repayment fees. If you plan to pay down debt quickly, a variable rate or split loan structure gives you more flexibility.
What happens if I need to sell my investment property during a fixed rate period?
When you sell during a fixed term, the lender will calculate break costs based on the difference between your fixed rate and current wholesale rates for the remaining period. These costs can be significant if rates have fallen since you fixed. Some lenders allow you to port the fixed rate to a new property if you're buying at the same time.
Should first-time investors fix their investment loan?
First-time investors often benefit from fixing at least part of their loan because it provides repayment certainty while they adjust to managing multiple properties. The trade-off is losing access to offset accounts and flexibility to refinance without break costs.
How do the new negative gearing rules affect fixed rate decisions?
From the 2027-28 income year, losses on established properties bought after 12 May 2026 can only offset residential property income, not salary. This increases your after-tax holding cost, which can make fixed rate certainty more valuable. Properties held before that date and eligible new builds are not affected.
Is it better to fix the whole loan or split it between fixed and variable?
Splitting your loan gives you some rate certainty on the fixed portion while keeping flexibility on the variable portion for extra repayments, offset accounts, and refinancing. It suits mid-career investors who expect to restructure or access equity within a few years.
