Understanding the basics of investment property loans

Buying an established rental property starts with understanding how lenders assess investor borrowing

Lenders assess investment loan applications differently to owner-occupied home loans. Your capacity to service the loan is tested against the rental income the property could generate, not just your salary, and lenders apply a higher interest rate buffer and stricter debt-to-income limits.

Every lender must assess your ability to repay at least 3.0 percentage points above the actual loan product rate. If you're applying for a variable rate investor loan at 6.2 per cent, the bank will test whether you can afford repayments at 9.2 per cent or higher. From February this year, lenders also face limits on how many investment loans they can write to borrowers with total debt six times their income or more. These settings don't make investor finance impossible, but they do shape how much you can borrow and which loan structures work for your situation.

Consider a Highett resident earning $95,000 who wants to purchase a two-bedroom unit in Mentone as a rental property. The property generates $450 per week in rent, but the lender will only credit 80 per cent of that income when calculating serviceability, to account for vacancy periods and maintenance costs. The borrower's existing personal expenses, credit card limits and any other debt all reduce the amount the lender will approve. If this borrower also carries a $15,000 credit card limit they rarely use, that limit alone could reduce their borrowing capacity by $60,000 to $90,000, even with a zero balance.

Investment loan options include variable, fixed and interest-only structures

Variable rate loans give you access to offset accounts and the flexibility to make extra repayments without penalty. Fixed rate loans lock in your repayment amount for a set period, usually one to five years, but typically don't allow offset accounts or unrestricted extra repayments. Many investors choose a split loan structure, fixing part of the loan amount and leaving the remainder on a variable rate.

Interest-only loans allow you to pay only the interest portion of the loan for a set period, usually five years, which reduces your minimum monthly repayment and may increase your cash flow in the early years of ownership. After the interest-only period ends, the loan reverts to principal and interest repayments. At current variable rates, an interest-only loan of $500,000 might require monthly repayments of around $2,580, compared to roughly $3,370 on a principal and interest loan at the same rate. That difference can matter if you're holding multiple properties or managing a tight cash flow, but you won't reduce the loan balance during the interest-only period.

Interest-only loans attract higher risk weightings under the lender's capital framework, which typically translates to a higher interest rate. The rate difference between interest-only and principal and interest loans on the same property can range from 0.20 to 0.60 percentage points, depending on the lender and your deposit size. If you're planning to access investment loan options across multiple lenders, this pricing difference becomes part of the overall comparison.

Loan to value ratio determines your deposit requirement and whether you'll pay Lenders Mortgage Insurance

The loan to value ratio is the loan amount expressed as a percentage of the property's value. If you borrow $480,000 to purchase a property valued at $600,000, your LVR is 80 per cent. Most lenders will lend up to 90 per cent LVR for investment property, but anything above 80 per cent triggers LMI, a one-off premium that protects the lender if you default.

LMI premiums are calculated on a sliding scale based on your loan amount and LVR. A $540,000 loan at 90 per cent LVR might attract an LMI premium of $15,000 to $20,000, depending on the insurer and lender. That premium is typically added to your loan balance rather than paid upfront, which increases your total borrowing and your ongoing repayments. Some lenders also charge stamp duty on the LMI premium, depending on the state or territory.

Offset account balances do not reduce the loan amount for LVR purposes. If you borrow $500,000 and later build up $50,000 in an offset account, your LVR is still calculated on the original $500,000 loan balance, not the net position. This matters if you're planning to refinance or access equity later, because lenders assess the current outstanding balance and the property's current value at that time, not the offset balance.

Highett's proximity to both Southland and the Bay Trail makes established units and townhouses popular with tenants

Highett sits between Cheltenham and Moorabbin, with direct access to Southland Shopping Centre, Westfield Southland, and a connected network of parks and bay-side trails. The suburb attracts a mix of young professionals, couples and small families who want affordable rental accommodation close to public transport and retail amenities. Established two-bedroom units in Highett typically appeal to tenants working in the Moorabbin employment precinct or along the Nepean Highway corridor.

Vacancy rates in the broader Bayside area have remained low over the past two years, which supports consistent rental income for investors who purchase well-located properties. Properties within walking distance of Highett station or near the Southland retail precinct tend to rent faster and hold tenants longer than those on the suburb's outer edges. If you're comparing investment property finance options for a Highett purchase, tenant demand and location within the suburb will directly affect the rental income lenders use in their serviceability assessment.

Tax benefits include deductible interest and claimable expenses, but new negative gearing rules apply to properties purchased after May last year

Interest on your investment loan is deductible against your rental income, along with council rates, insurance, property management fees, repairs and depreciation. If your deductible expenses exceed your rental income in a given year, you generate a tax loss. For established properties purchased before 12 May 2026, that loss can be offset against your salary and other income. For established properties purchased after that date, losses can only be offset against income from other residential property investments or carried forward to future years.

Consider a scenario where you purchased an established unit in Highett in early 2026, before the cut-off date. You pay $28,000 per year in loan interest, $3,500 in rates and insurance, $2,800 in property management fees and $1,200 in repairs, totalling $35,500 in deductible costs. The property generates $23,400 in rent. Your tax loss is $12,100, which you can claim against your salary, potentially saving $4,500 to $5,500 in tax depending on your marginal rate. That same property purchased in October 2026 would still generate the same tax loss, but you could only offset it against income from other residential property investments or carry it forward.

New build properties remain exempt from the negative gearing changes, meaning losses on newly constructed dwellings can still be offset against all income. Knock-down rebuilds that don't increase the dwelling count, and substantial renovations, don't qualify as new builds for this purpose.

Refinancing an investment loan can access equity for portfolio growth or secure a lower rate

Once your property increases in value or you pay down the loan balance, you build equity. That equity can be released and used as a deposit for a second investment property, without selling the first. Lenders will typically allow you to borrow up to 80 per cent of the property's current value without paying LMI, which means you can access equity while keeping your LVR at or below that threshold.

If your Highett investment property was purchased for $600,000 with a $480,000 loan and is now valued at $680,000, you have $200,000 in equity. At 80 per cent LVR, you could borrow up to $544,000 against that property, which would release $64,000 in usable equity after repaying the original loan. That $64,000 could then form part or all of your deposit for a second property. Refinancing to access equity is common among investors building a property portfolio, but it increases your total debt and your repayment obligations, so serviceability remains the key constraint.

Refinancing an investor loan may also deliver a lower interest rate if your current loan is no longer competitive or if you've built equity and can now access a lower LVR pricing tier. Many lenders offer rate discounts for investment loans below 70 per cent or 60 per cent LVR, and switching lenders can sometimes deliver an additional discount for new business. If you're considering refinancing, factor in discharge fees from your current lender, application fees and valuation costs with the new lender, and any break costs if you're exiting a fixed rate loan early.

If you're ready to explore your options or want to understand how much you could borrow for an investment property in Highett or the surrounding Bayside area, call one of our team or book an appointment at a time that works for you.

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