How to Use Fixed Rate Loans and Offset Accounts

Fixed rate investment loans do not typically allow full offset account functionality. Most lenders restrict offset features on fixed rate products, meaning your cash savings cannot reduce the interest charged on the fixed portion of your borrowing.

This restriction matters for Glen Waverley investors building portfolios in an environment where rental losses can no longer be offset against employment income. From 1 July 2027, net rental losses from residential dwellings acquired after 7:30pm AEST on 12 May 2026 are quarantined and can only be offset against other residential rental income or carried forward. If you purchase an investment property in Glen Waverley today, you have until 30 June 2027 to claim losses under existing rules, but after that date your strategy needs to account for loss quarantining.

Why Offset Accounts Matter for Property Investors

An offset account reduces the balance on which interest is calculated. If you have a loan of $600,000 and $50,000 sitting in a linked offset account, you pay interest on $550,000. The full loan balance remains, but your interest cost falls.

For investors, this creates a tax problem. Interest on investment borrowings is deductible to the extent the property is rented or held to produce assessable income. When you reduce the interest cost through an offset, you also reduce the deduction. That matters if you are structuring your affairs to quarantine losses or maximise rental income that can absorb future losses.

Most lenders allow full 100 per cent offset on variable rate investment loans but restrict or remove the feature entirely on fixed rate products. Some lenders offer a partial offset on fixed rates, typically capped at $10,000 or $20,000, which limits the tax and cash flow benefit.

How Fixed Rate Loans Work for Investment Property

A fixed rate locks your interest cost for a set period, typically between one and five years. You know exactly what your repayments will be, and those repayments do not change when the Reserve Bank adjusts the cash rate.

The loan reverts to a variable rate at the end of the fixed term unless you negotiate a new fixed period. Most lenders allow you to refix without refinancing, but the rate you receive depends on market conditions at the time.

Fixed rates are priced from wholesale swap markets, not the cash rate. That means they can move independently of what the Reserve Bank does. When the market expects rate cuts, fixed rates often fall before variable rates. When the market expects rate rises, fixed rates often increase before variable rates move.

The Split Rate Structure That Preserves Flexibility

Splitting your loan between fixed and variable portions allows you to hold offset functionality on the variable component while locking certainty on the fixed component.

Consider an investor who purchases a two-bedroom unit near Kingsway in Glen Waverley. The property is within walking distance of The Glen Shopping Centre and attracts strong rental demand from professionals working in nearby Monash or Chadstone precincts. The investor borrows 80 per cent of the purchase price and splits the loan into $400,000 fixed for three years and $200,000 variable with a full offset account attached.

The investor directs rental income and surplus cash into the offset account. The $200,000 variable portion accrues less interest as the offset balance grows, but the $400,000 fixed portion remains unaffected. The interest on the full $600,000 remains deductible because the offset is linked to an investment loan and the property is income-producing.

This structure allows the investor to reduce interest costs without compromising deductibility, and it preserves flexibility if the investor needs to access cash for another deposit or to cover vacancy periods. Glen Waverley has historically maintained a low rental vacancy rate due to proximity to Monash University, Wesley College and the M1 corridor, but vacancies still occur and holding accessible cash reduces the need to draw on redraw or personal savings.

What Happens When the Fixed Period Ends

Your loan does not require refinancing when the fixed term expires. It automatically converts to the lender's standard variable rate unless you negotiate a new fixed rate or switch lenders.

Most lenders contact you 30 to 90 days before expiry and offer a new fixed rate. That rate is not guaranteed to be lower than your expiring rate. If wholesale rates have risen, your new fixed rate may be higher than the variable rate available at the same time.

If you want to refinance to a different lender, you can do so at expiry without paying break costs. Break costs apply only if you exit a fixed rate loan before the end of the fixed term. The calculation compares the interest the lender expected to earn over the remaining fixed period with the interest they can now earn by lending those funds at current wholesale rates. If rates have fallen, the break cost can be substantial. If rates have risen, the break cost is typically zero.

How Loss Quarantining Affects Your Loan Structure

From 1 July 2027, rental losses on residential investment properties acquired after 7:30pm AEST on 12 May 2026 cannot be offset against salary, wages or other non-residential income. Losses are quarantined and can only be offset against other residential rental income or carried forward to offset future rental income or capital gains on residential property.

This changes the value of deductions. If you cannot use a loss to reduce your taxable income in the year it occurs, the deduction delivers no immediate benefit. It may deliver a future benefit if you acquire additional rental properties that produce positive income, or when you sell and realise a capital gain, but the timing and value of that benefit are uncertain.

For Glen Waverley investors, this affects how you weight interest cost against cash flow. If losses are quarantined, paying a higher interest rate to access offset functionality may not deliver the same after-tax benefit it once did. You may prioritise a lower fixed rate without offset over a higher variable rate with offset, particularly if you do not expect to generate surplus rental income from other properties in the short term.

Investors who already hold properties acquired before 7:30pm AEST on 12 May 2026 can continue to negatively gear those properties under existing rules until sold. Properties under contract awaiting settlement at that time are also grandfathered. If you are building a portfolio and some properties are grandfathered while others are subject to quarantining, your loan structure should reflect the different tax treatment of each asset.

Interest Only Repayments and Loan to Value Ratio

Most investment loans allow interest only repayments for an initial period, typically five years. You pay only the interest charged each month, and the loan balance does not reduce. At the end of the interest only period, the loan converts to principal and interest repayments unless you negotiate an extension.

Interest only repayments maximise your deductions in the early years because the loan balance remains at its highest level. They also preserve cash flow, which matters if you are holding the property for capital growth rather than income.

Lenders assess your ability to service the loan at principal and interest repayments, even if you elect interest only. APRA requires lenders to apply a serviceability buffer of 3 percentage points above the product rate. If you are applying at a rate of 6.5 per cent, the lender assesses your capacity to service the loan at 9.5 per cent on a principal and interest basis.

The APRA debt-to-income cap, effective 1 February 2026, allows lenders to fund up to 20 per cent of new investor loans at a DTI of 6 times or greater. If your total borrowings exceed six times your gross income, you may fall within that cap and find fewer lenders willing to approve your application. The cap applies separately to investor and owner-occupier portfolios, so your owner-occupied borrowing does not affect your investor DTI calculation.

If you are borrowing more than 80 per cent of the property value, you will pay Lenders Mortgage Insurance. LMI is a one-off cost, typically capitalised into the loan, and it is not refundable if you refinance or sell. For investment loans, LMI is a deductible expense and can be claimed over five years or the term of the loan, depending on the amount.

Eligible New Builds and Continued Access to Negative Gearing

Properties classified as eligible new residential dwellings under the Treasury Laws Amendment (Tax Reform No. 1) Act 2026 are exempt from loss quarantining. Losses from these properties can continue to be offset against other income, including salary and wages, in the same way grandfathered properties can.

An eligible new build is a dwelling constructed on previously vacant land, or a dwelling that replaces an existing property where the number of dwellings increases. Knock-down rebuilds that do not increase dwelling numbers are not eligible. Substantial renovations are also excluded.

Glen Waverley has seen a number of townhouse and dual-occupancy developments replace older single dwellings, particularly in streets south of High Street Road and around Bogong Avenue. If you purchase a newly constructed townhouse in one of these developments, and the development increased the number of dwellings on the land, the property should qualify as an eligible new build. You can continue to negatively gear that property, and at the time of sale you can elect between the 50 per cent CGT discount and cost base indexation with a minimum 30 per cent tax rate on real gains.

If a new build is occupied for more than 12 months before it is sold to a subsequent investor, that subsequent investor loses access to negative gearing. The exemption applies only to the first investor who purchases the property as new.

This creates an opportunity for investors willing to purchase off-the-plan or newly completed dwellings. The tax treatment is more favourable than purchasing an established property, and financing for newly erected dwellings is exempt from the APRA DTI cap, which may improve your ability to borrow if your income is constrained.

Structuring Loans Across a Portfolio

If you hold multiple investment properties, each with different loan structures and tax treatment, your priority should be to match your most flexible loan features to the properties that benefit most from them.

Properties that are grandfathered or classified as eligible new builds should carry the variable rate loans with offset accounts, because the offset reduces your interest cost and the reduced interest remains fully deductible against other income. Properties subject to loss quarantining should carry the fixed rate loans without offset, because the inability to use losses immediately reduces the value of maximising deductions, and locking a lower fixed rate may deliver more certain cash flow.

This approach assumes you have sufficient borrowing capacity to structure loans separately for each property. If you are consolidating debt or using equity from one property to fund the deposit on another, your structure will depend on how the lender allows you to split and link facilities.

Most lenders allow up to ten splits on a single loan account, but not all lenders permit offset accounts to be linked to fixed rate splits, even if those splits are part of a mixed variable and fixed structure. You should confirm the lender's policy on splits and offsets before finalising your loan application, particularly if you are using a split structure to manage tax and cash flow across multiple properties.

Call one of our team or book an appointment at a time that works for you. We work with property investors across Glen Waverley and can help you structure your loans to reflect the tax treatment of each asset in your portfolio.

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