Owning Multiple Investment Properties: What Not to Miss

Your borrowing capacity shrinks with each property you add, and most portfolio investors hit a ceiling not because lenders refuse them, but because the serviceability test leaves no room.

The challenge for anyone expanding your property portfolio around Eltham is that lenders assess every new investment loan application against your entire debt position, rental income assumptions, and a serviceability buffer set by APRA at three percentage points above the actual rate. If you structure your first two acquisitions poorly, the third becomes unaffordable on paper even when the portfolio generates positive cash flow in practice.

Serviceability Compression Across Multiple Properties

Lenders discount rental income by 20 to 30 per cent to account for vacancies, maintenance, and periods between tenants. That discount applies to every property in your portfolio, which means the income a lender recognises falls further behind the actual rent you collect as you acquire more dwellings.

Consider an investor who owns two properties in Eltham and nearby Greensborough, each generating rental income that covers most of the interest-only repayment. When they apply for a third investment loan, the lender may only recognise 70 to 75 per cent of the combined rent, then assess whether the applicant can service all three loans at a rate three percentage points higher than the product rate. The result is that borrowing capacity contracts sharply, even though the portfolio itself remains cash flow neutral or positive.

In our experience, investors who alternate between interest-only and principal-and-interest repayment structures across properties can preserve more borrowing capacity over time, because lenders see smaller total repayment obligations when modelling serviceability.

Interest-Only Periods and Portfolio Sequencing

Interest-only investment loans defer principal repayments for a set period, which reduces the monthly commitment and keeps more capacity available for the next acquisition.

Most lenders offer interest-only terms of five years on investment property finance, renewable subject to valuation and equity position. When the interest-only period expires, the loan reverts to principal and interest, and the repayment increases. If you hold three properties and all three revert to principal and interest simultaneously, your total repayment obligation can jump by several thousand dollars per month, which compresses borrowing capacity and may block further acquisitions.

Staggering interest-only expiry dates across your portfolio smooths that transition. An investor purchasing in Eltham in one year, then Diamond Creek two years later, and Montmorency a further two years after that, will see interest-only periods end at different times. That prevents the sudden increase in repayment obligations that can lock you out of future lending.

Debt-to-Income Limits and Portfolio Growth

From 1 February 2026, APRA introduced a debt-to-income cap that restricts the proportion of new investor loans a bank can write at six times annual income or higher. The cap applies to each lender's portfolio, not to individual borrowers, but in practice it means banks now scrutinise high-DTI applications more carefully and may decline loans they would have approved in the past.

For a portfolio investor, DTI becomes binding when total borrowings approach six times gross annual income. Rental income does not count as income for DTI purposes under the APS 220 framework, which means the calculation excludes the very cash flow that supports the portfolio.

If your salary is $120,000 and your total investment loan debt reaches $720,000, you are at the six-times threshold. A fourth property purchase that pushes total debt to $900,000 may require a lender exemption or force you to seek finance from a non-bank lender not subject to APRA prudential settings. Non-bank lenders typically charge higher rates, but they assess applications on cash flow rather than DTI, which can make them the only viable option for experienced investors with strong rental income but limited salary.

Equity Release and Cross-Securitisation

Using equity from an existing property as deposit for the next purchase is common among portfolio investors, but the way that equity is secured affects flexibility later.

Cross-securitisation occurs when a lender holds multiple properties as security under a single loan facility. It can simplify the application process and reduce costs, but it also means you cannot sell or refinance one property without the lender's consent to release it from the security pool. That lack of flexibility becomes costly if you want to refinance a single property to access a lower rate or release equity, because the lender may require you to refinance the entire portfolio.

Separate loans with standalone security on each property preserve flexibility. You can refinance or sell individual properties without affecting the others, and you retain the option to move one loan to a different lender if a more suitable investment loan product becomes available. The trade-off is higher upfront costs, because each property requires its own valuation, settlement, and sometimes separate applications.

In a scenario where an Eltham investor owns three properties financed under separate facilities, they can refinance the Lower Templestowe property to access equity for a fourth purchase while leaving the Eltham and Ivanhoe loans untouched. Under cross-securitisation, that selective refinancing would not be possible without the original lender's agreement.

Choosing Investment Loan Products for a Multi-Property Portfolio

Fixed rate investment loans offer repayment certainty but restrict prepayments and prevent you from accessing equity during the fixed term without paying break costs. Variable rate investment loans allow unlimited extra repayments and redraw, which is useful if you plan to leverage equity for further acquisitions.

Many portfolio investors split their borrowing across fixed and variable products. A portion on a fixed rate protects against rate increases, while the variable portion remains flexible for equity release or accelerated repayment if cash flow improves. The ratio depends on your risk tolerance and acquisition timeline, but a 50/50 split is common.

Lenders also vary in how they assess rental income and apply vacancy discounts. Some lenders recognise 80 per cent of rental income on new builds, compared to 70 per cent on established dwellings. If your portfolio includes a mix of new and established properties, selecting a lender with favourable rental income treatment can preserve borrowing capacity.

Negative Gearing and the July 2027 Changes

Under current rules, net rental losses on investment properties can be offset against salary and other income, reducing your taxable income. From 1 July 2027, rental losses on residential properties purchased on or after 12 May 2026 will be quarantined and can only be offset against other residential rental income or carried forward.

Properties you already own, or those under contract before 12 May 2026, remain unaffected. Eligible new builds purchased after that date retain full negative gearing under existing rules, which makes them more attractive from a tax perspective than established properties for anyone building a portfolio now.

For an Eltham investor planning multiple acquisitions, the sequencing matters. Purchasing an established property before 12 May 2026 locks in the current negative gearing treatment for that dwelling. Any subsequent purchase of an established property after that date will be subject to quarantining, but rental losses from the older property can still offset salary.

The capital gains tax changes taking effect on the same date replace the 50 per cent discount with cost base indexation and a minimum 30 per cent tax rate on real gains. Gains accrued before 1 July 2027 on properties you already own remain under the current rules, so only growth after that date is subject to the new treatment. New build properties retain an election between the discount and indexation, which provides some flexibility depending on how inflation and holding period interact.

Lenders Mortgage Insurance and Loan-to-Value Ratios

Lenders Mortgage Insurance is payable when your loan amount exceeds 80 per cent of the property value. For investment loans, LMI premiums are higher than for owner-occupied lending, and many lenders cap investment loan LVR at 90 per cent even with LMI.

If you have a deposit of 15 per cent and need to borrow 85 per cent, you will pay LMI. That cost is typically capitalised into the loan amount, which further increases your total debt and reduces borrowing capacity for the next purchase. Some portfolio investors choose to limit LVR to 80 per cent on each acquisition to avoid LMI, using equity from existing properties rather than paying the premium.

Certain lenders offer LMI waivers for professionals in medicine, law, and accounting. If you qualify, you can borrow up to 90 or sometimes 95 per cent without paying LMI, which preserves cash and equity for additional acquisitions.

Managing Cash Flow and Interest Rate Risk

Each property you add to your portfolio increases your exposure to interest rate movements. A one percentage point rise in the variable interest rate can add several hundred dollars per month to the repayment on each loan, and that increase is multiplied across every property you own.

Building a cash buffer within your portfolio, either through offset accounts or redraw facilities on variable rate loans, gives you the capacity to absorb rate rises without needing to sell. Offset accounts are particularly useful because the balance reduces the interest charged without locking funds into the loan, which means you retain access to liquidity.

Rental vacancy also creates cash flow gaps. Eltham's rental vacancy rate has historically remained low, but even a short vacancy between tenants can leave you covering the full repayment from other income. Holding a reserve equivalent to three to six months of repayments across the portfolio provides a margin for vacancies, unexpected maintenance, and rate increases.

Structuring Ownership and Tax Efficiency

Ownership structure affects tax, asset protection, and borrowing capacity. Holding properties in individual names, joint names, a trust, or a company each produce different outcomes.

Individual ownership in the name of the lower-income partner can maximise the value of negative gearing, because rental losses offset income taxed at a lower marginal rate. Joint ownership splits rental income and losses equally, which may suit couples with similar incomes. Trust structures offer flexibility in distributing income and losses among beneficiaries, but many lenders apply stricter serviceability tests to trust borrowers and may charge higher rates.

Company ownership is rare for residential investment property because companies do not receive the capital gains tax discount and rental losses are trapped within the company rather than offset against personal income. The exception is when the company is part of a broader business structure or when asset protection is the priority.

Changing ownership structure after purchase triggers stamp duty and capital gains tax, so the decision should be made before you acquire the first property. If you plan to build a portfolio of multiple properties, speaking with an accountant and broker early will help you choose the structure that aligns with your tax position and long-term goals.

Call one of our team or book an appointment at a time that works for you. We work with portfolio investors across Eltham and the surrounding area, and we can help you structure your investment loan applications to preserve borrowing capacity as you grow.

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