Locking in a portion of your investment loan at a fixed rate can shield your cash flow from rate shocks and stabilise returns when you're holding property in a growth corridor.
Ellenbrook sits at the centre of Perth's outer northern expansion, with median house prices around $850,000 and yields approaching 4.5 per cent. The suburb's combination of affordable entry and strong rental demand makes it an active target for investors, but rising borrowing costs have compressed margins. A well-structured fixed rate component can restore predictability without sacrificing the flexibility most portfolio builders need.
Why fixed rate features matter for investment loans
A fixed rate locks your interest cost for a set term, typically one to five years, regardless of what the cash rate does. For investors relying on rental income to service debt, that certainty translates directly to stable cash flow and predictable deductions.
From the 2027-28 income year, losses on established investment properties acquired after 12 May 2026 can only offset residential property income, not salary or other income. If you're buying in Ellenbrook today with plans to expand your portfolio, fixed repayments let you model tax outcomes with precision and avoid surprise shortfalls when serviceability matters most.
Consider an investor who secures a loan for a house in Ellenbrook at current rates. Rental income sits around $750 per week, yielding close to $39,000 annually. If rates climb another 50 basis points over the next 12 months, weekly repayments on a variable loan could jump by $80 to $100, cutting net yield and forcing the investor to bridge the gap from after-tax income. A three-year fixed rate component on half the loan caps that exposure, preserving cash flow and keeping the investment positively or neutrally geared.
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Split loan structures that balance certainty and access
Most lenders allow you to split a single investment loan into fixed and variable portions. A common strategy is to fix 50 to 70 per cent of the loan and leave the remainder variable, giving you a buffer against rate rises while maintaining access to redraw or offset on the variable portion.
Fixed rate loans generally carry break costs if you repay early or refinance before the fixed term ends, calculated based on the difference between your fixed rate and the lender's current wholesale funding cost. The variable portion lets you make extra repayments, use offset accounts to reduce daily interest, or access equity without triggering those costs.
In a scenario like this, an investor with an $680,000 loan fixes $476,000 for three years at a rate near current fixed offers and keeps $204,000 variable. Rental income covers the fixed portion reliably. Any surplus cash or tax refunds can sit in an offset account linked to the variable split, cutting effective interest and building a liquidity buffer. When the fixed term ends, the investor reassesses rates and either refixes, converts to variable, or splits again depending on the cycle.
Interest-only repayments and their role in fixed rate planning
Interest-only loans allow you to pay only the interest component each month, deferring principal repayment and reducing your minimum monthly outgoing. For investment properties, this maximises tax deductions (since all interest on investment borrowing is deductible) and frees up cash flow for portfolio growth or other investments.
Fixed rate investment loans can be structured as interest-only for the initial period, typically up to five years. After that, the loan either reverts to principal and interest or can be renegotiated. Combining interest-only with a fixed rate gives you the lowest possible repayment for the fixed term, which is useful if you're expanding your property portfolio and need to demonstrate serviceability for a second or third loan.
Be aware that long-term interest-only residential loans with an LVR above 80 per cent and an interest-only period greater than five years are classified as non-standard under prudential standards, which can affect pricing and approval. Most investors in Ellenbrook will borrow at an LVR between 80 and 90 per cent, so structuring interest-only within a five-year term keeps the loan in the standard category and avoids the higher risk weight.
Rate lock periods and timing your fix
Most lenders offer a rate lock when you apply for a fixed loan, holding the advertised rate for 60 to 90 days while your application settles. If rates drop during that window, some lenders allow a one-time re-lock at the lower rate. If rates rise, your locked rate protects you.
Timing matters in Ellenbrook because settlement periods on house-and-land packages or new builds can stretch beyond 90 days. If you're buying your first investment property off the plan, coordinate your loan application so the rate lock covers settlement, or arrange a progressive drawdown structure where the fixed rate applies to each stage as funds are released.
For established properties, the standard 30 to 45-day settlement gives you a tight rate lock window. If you're refinancing an existing investment loan, you have more control over timing and can lock a rate when the market favours it, then settle within the lock period.
Portability, top-ups and equity access under a fixed rate
Fixed rate loans typically restrict additional borrowing, lump-sum repayments and early exit without cost. If you plan to leverage equity from your Ellenbrook property to fund a second purchase, structure your loan so the equity release happens on the variable portion or wait until the fixed term ends.
Some lenders offer portable fixed rate loans, allowing you to transfer the fixed rate and remaining balance to a new property if you sell and buy within a short window. This feature is rare and usually comes with conditions, but it can be valuable if you intend to trade up within the fixed term.
Top-ups during the fixed period generally trigger break costs unless the lender allows a small annual increase (often up to 10 per cent of the original fixed amount) without penalty. Check the loan's terms before committing, especially if you anticipate needing to access equity within three years.
Fixed rate loans and tax planning from 2027-28
From 1 July 2027, capital gains on residential investment property will be taxed under a new indexed cost base and minimum 30 per cent rate on real gains, replacing the 50 per cent CGT discount for gains accruing after that date. While that change affects your eventual exit strategy, your borrowing structure today influences cash flow and the viability of holding through the transition.
Fixed repayments give you a stable base to forecast net rental income and quarantined losses under the new negative gearing rules. If you acquire an established property in Ellenbrook after 12 May 2026, losses can only offset other residential property income or capital gains. A fixed rate reduces the chance of a blowout in interest expense that pushes you into a deeper loss position you cannot use immediately.
For properties that qualify as eligible new builds (such as newly completed house-and-land packages in Ellenbrook's newest estates), losses remain fully deductible against all income, and you retain the choice of the old 50 per cent CGT discount or the new indexed system at sale. Fixing a portion of the loan on a new build locks in deductibility and cash flow certainty for the full fixed term, supporting a hold strategy until the next cycle.
Refinancing out of a fixed rate and break cost calculation
If you need to refinance your investment loan before the fixed term ends, the lender will charge a break cost based on the difference between your fixed rate and the lender's current cost of funds. In a falling rate environment, break costs can be substantial. In a rising rate environment, they may be zero or even result in a break fee rebate.
Break costs are calculated using a present-value formula that accounts for the remaining term and the rate differential. A rough guide: if you fixed at 5.5 per cent for five years and rates have since fallen to 4.5 per cent, breaking two years into the term could cost several thousand dollars per $100,000 borrowed. If rates have risen to 6.5 per cent, the lender may waive the cost or offer a small rebate.
Before committing to a fixed rate, model the scenarios where you might need to exit early (sale, refinance, portfolio restructure) and weigh the cost against the benefit of rate protection. For many Ellenbrook investors, a three-year fix balances protection with flexibility, as the outer suburbs' price growth can support a refinance or equity release at the end of that term.
Offset accounts, redraw and fixed loan limitations
Most fixed rate investment loans do not offer offset accounts. Some lenders provide a partial offset (where only a percentage of the balance offsets interest) or allow offset only on the variable portion of a split loan.
Redraw on fixed loans is similarly restricted. You may be able to redraw small amounts annually without penalty, but large or frequent redraws can trigger break costs or breach the loan terms. If cash flow management and tax efficiency through offset are priorities, keep the majority of your loan variable or use a 50/50 split with offset on the variable side.
For investors in Ellenbrook who receive quarterly rental income and want to reduce daily interest, an offset account on the variable portion captures that cash and cuts the effective rate without losing access to the funds. The fixed portion remains untouched, delivering rate certainty, while the variable portion absorbs surplus and provides liquidity.
Comparing fixed investment loan products across lenders
Not all fixed rate investment loans are priced identically. Lenders differentiate based on LVR, interest-only versus principal-and-interest, loan size, and whether the property is owner-occupied or investment. Investment loans generally attract a rate premium of 20 to 60 basis points over equivalent owner-occupied products.
When comparing offers, check the comparison rate (which includes fees) and confirm whether the fixed rate applies to interest-only or requires principal-and-interest from day one. Some lenders offer a lower fixed rate but require principal-and-interest repayments, which increases your monthly outgoing and reduces deductible interest over time.
Also confirm the lender's policy on Lenders Mortgage Insurance at higher LVRs. LMI is generally required where the LVR exceeds 80 per cent and is calculated on a sliding scale based on loan amount and LVR; the premium is a borrower cost and may attract stamp duty in some states. A lender offering a competitive fixed rate but higher LMI can end up more expensive over the life of the loan.
Call one of our team or book an appointment at a time that works for you. We'll compare fixed and split rate structures across the lenders active in Ellenbrook's investment market and model the cash flow and serviceability impact for your specific scenario.
Frequently Asked Questions
Can I access equity from a fixed rate investment loan?
Accessing equity during a fixed rate term usually triggers break costs unless the lender permits a small annual top-up without penalty. To avoid this, structure your loan as a split with a variable portion for equity access, or wait until the fixed term ends before refinancing.
Do fixed rate investment loans allow offset accounts?
Most fixed rate loans do not offer offset accounts. Some lenders provide a partial offset or allow offset only on the variable portion of a split loan. If cash flow management through offset is important, keep a portion of your loan variable.
How do break costs work if I refinance before the fixed term ends?
Break costs are calculated based on the difference between your fixed rate and the lender's current wholesale funding cost, adjusted for the remaining term. In a falling rate environment, costs can be significant; in a rising rate environment, they may be zero or result in a rebate.
Can I fix an interest-only investment loan in Ellenbrook?
Yes, you can structure a fixed rate investment loan as interest-only for the initial period, typically up to five years. This maximises tax deductions and reduces monthly repayments, but loans with LVR above 80 per cent and interest-only terms longer than five years are classified as non-standard and may attract higher pricing.
What split ratio works for investors wanting certainty and flexibility?
A common strategy is to fix 50 to 70 per cent of the loan and leave the remainder variable. This gives you rate protection on the majority of the debt while maintaining access to redraw, offset and equity on the variable portion without triggering break costs.
