Fixed vs Variable Investment Property Loan

Owner-occupiers choosing between fixed and variable are making a budgeting decision. Investors are making a tax decision.

That distinction gets lost in most comparisons. The standard advice runs: fixed gives you certainty, variable gives you flexibility, pick whatever lets you sleep at night. Fine for someone paying down a home they live in. But for an investor, locking in a fixed rate does something else entirely. It removes access to an offset account, which is the one structural tool that reduces interest costs without affecting the tax deductibility of your loan interest.

The question is not just whether rates will rise or fall. It is whether rate protection is worth more to you than tax-optimised loan structure. That depends on where rates sit today, where they might go, and how much cash you can park in an offset.

Where investment loan rates sit right now

As of April 2026, the average new investment loan rate is 6.15% for principal-and-interest and 6.23% for interest-only. Outstanding investment loans average slightly higher: 6.15% for P&I and 6.33% for interest-only.

Investors pay more than owner-occupiers across the board. New investment P&I loans sit at 6.09% compared to 5.92% for owner-occupier P&I, a premium of roughly 17 basis points. That gap widens further for interest-only loans.

These are averages. To access the best investment loan rates, you generally need an LVR below 60%. Most investors won't be there on a first property, which means the rates you're actually quoted will likely sit above these figures.

The rate environment: rising, holding, or something else

The RBA held the cash rate at 4.35% at its June 2026 meeting after hiking three times this year. The board has explicitly stated it will increase the cash rate further if required, and the next decision is due August 11.

The big four banks cannot agree on what happens next.

Westpac predicts two more 25 basis point hikes in August and September, bringing the cash rate to 4.85%. ANZ, CBA, and NAB all predict no further hikes, with cuts beginning in 2027. ANZ and CBA see the cash rate reaching 3.85% by late 2027. NAB is more aggressive, forecasting 3.60% by year-end 2027.

That is a 125 basis point spread between the most hawkish and most dovish forecasts. If Westpac is right, fixing now locks in a rate below the peak. If the other three are right, variable borrowers will see rate relief within 12 to 18 months while fixed borrowers sit on a locked rate they cannot escape cheaply.

This uncertainty is exactly why the fixed vs variable investment property loan decision requires more than a rate forecast. You need to weigh the structural trade-offs.

How fixed loans work for investors

A fixed rate loan locks your rate for one to five years, with shorter terms generally carrying lower rates. For the duration of that term, your repayments do not change regardless of what the RBA does.

Fixed loans are historically popular during rising rate environments because borrowers want protection against further increases. That instinct is understandable when banks are actively disagreeing about whether the peak is in.

For investors specifically, a fixed rate can provide a financial buffer while establishing tenants and optimising rental returns. If you have just settled on a property and need three to six months to find tenants, renovate, or sort property management, knowing your exact repayment amount removes one variable from an already uncertain period.

But fixed loans come with constraints that hit investors harder than owner-occupiers.

Extra repayment caps. Most lenders cap additional repayments at $10,000 to $20,000 per year before fees apply. Redraw is frequently not offered. Full offset accounts are uncommon on fixed loans, and where offered, they are usually partial or limited.

The revert rate. When the fixed term ends, your loan reverts to the lender's standard variable rate, which is often more than 200 basis points higher than competitive market rates. If you do not refinance before the fixed term expires, you can find yourself paying well above what a new borrower would get.

Break fees. If you need to sell the property, refinance, or restructure before the fixed term ends, your lender will charge a break fee that can run into thousands of dollars. For investors who may need to sell into a changing market, this is a real constraint.

Why offset accounts matter differently for investors

This is where the fixed vs variable investment property loan comparison diverges from the owner-occupier version.

Interest on an investment property loan is tax-deductible. That deduction is the reason loan structure determines how much you can deduct each year and how your deduction profile changes over the life of the loan.

An offset account on a variable loan lets you park cash against your loan balance. If you owe $500,000 and hold $50,000 in the offset, you pay interest on $450,000. The loan balance itself stays at $500,000. That matters because the offset reduces interest costs without affecting tax deductibility. Your deductible loan balance is unchanged. You are simply paying less interest on it.

Compare that to making extra repayments on a fixed loan (where allowed). Those repayments reduce your actual loan balance, which reduces the interest charged, which reduces your tax deduction. The dollars are identical. The tax treatment is not.

This is why many investors with significant savings choose variable, even in a rising rate environment. The offset account is doing double duty: reducing interest costs in real terms while preserving the full deductible loan balance for tax purposes. A fixed rate eliminates that tool.

The impact scales with how much cash you can park. If you have $5,000 in savings, the offset does almost nothing. If you have $80,000, the interest saving is material and the tax preservation compounds over the life of the loan. Your savings position determines which structure is optimal, not just your rate outlook.

For a deeper comparison of repayment structures, see our guide on interest-only vs principal and interest for investment properties.

Variable: flexibility that compounds over time

Variable rate loans typically come with offset accounts and redraw facilities, features that fixed loans restrict or exclude entirely. You can make unlimited extra repayments, access redraw if cash flow tightens, and maintain full offset functionality.

Variable rates also move with the cash rate. If the ANZ/CBA/NAB forecasts prove correct and cuts arrive in 2027, variable borrowers see relief automatically. Fixed borrowers do not, unless their term has already expired.

The trade-off is obvious: if Westpac is right and rates climb to 4.85%, variable borrowers absorb every basis point of those increases in real time. There is no ceiling.

For investors holding established properties with stable tenants and strong cash reserves, variable tends to be the stronger structural choice. The offset functionality, unlimited extra repayments, and automatic pass-through of any future rate cuts create a compounding advantage over a multi-year hold.

The split loan option

If you cannot stomach full variable exposure but refuse to give up offset access entirely, a split loan divides your borrowing into two portions: one fixed, one variable.

Fix 60% to lock in certainty on the larger tranche. Keep 40% variable with a full offset account attached. Your savings sit against the variable portion, preserving some of the tax-optimised structure while the fixed portion provides a floor on your worst-case repayment scenario.

The split ratio is yours to set. Investors who are more concerned about rate rises can fix a larger share. Those who prioritise offset functionality can keep a larger variable portion. There is no universally correct ratio. It depends on your cash reserves, your risk tolerance, and how long you plan to hold the property.

A split loan does add complexity. You are managing two rate structures, two sets of terms, and potentially two revert dates. But for investors caught between rate protection and tax optimisation, it is the most practical middle ground.

Who should fix right now, and who should stay variable

Consider fixing (or a larger fixed split) if:

• You have recently purchased and need payment certainty while establishing tenants and optimising rental returns
• Your cash reserves are modest and offset functionality would not materially reduce your interest costs
• You are cash-flow tight and a further 50 basis point increase would create genuine financial stress
• You are in the portfolio establishment phase and predictability matters more than maximising deductions

Stay variable (or keep a larger variable split) if:

• You have meaningful savings to park in an offset account
• You are holding an established property with stable rental income
• You plan to refinance or restructure within the next two to three years (avoiding break fees)
• You believe rate cuts in 2027 are more likely than further hikes

For either path: structuring your loan correctly is crucial for investors as it can optimise your cash flow, tax benefits, and overall financial strategy. The rate is one input. The structure around it, including how your investment property loan interacts with your broader tax position, is what determines whether the loan works for or against your portfolio over time.

FAQ

Should I fix my investment property loan in 2026?

It depends on your cash position and portfolio stage. If you have just purchased and need payment certainty while finding tenants, a fixed or partially fixed loan provides a buffer. If you have substantial savings that could sit in an offset account, staying variable preserves a tax-optimised structure that fixed loans cannot replicate.

What is the difference between fixed and variable rates for investment loans?

A fixed rate locks your repayments for one to five years regardless of RBA decisions. A variable rate moves with the cash rate and typically includes offset accounts and redraw facilities. For investors, the key difference is that fixed loans usually restrict offset account access, which affects how interest deductions interact with your tax position.

Can I split my investment property loan between fixed and variable?

Yes. A split loan divides your borrowing into a fixed portion and a variable portion. The fixed tranche gives you rate certainty while the variable tranche retains full offset and redraw functionality. You choose the ratio based on your cash reserves and risk tolerance.

Are investment property loan interest rates higher than owner-occupier rates?

Yes. As of April 2026, new investment P&I loans average 6.09% compared to 5.92% for owner-occupier P&I loans, a premium of roughly 17 basis points. Interest-only investment loans carry higher rates again.