Unlock the secrets to rental yield on investment loans

What rental yield means for your investment loan application

Rental yield is the annual rent as a percentage of the property's value, and lenders use it to assess whether your investment can service the loan. A property returning $650 per week on a $750,000 purchase delivers a gross yield of around 4.5 per cent, which sits comfortably within lender expectations for inner Perth suburbs. South Perth properties, particularly older units near the foreshore and along Mends Street, often return yields in the 4 to 5 per cent range, while standalone homes closer to Perth Zoo and Sir James Mitchell Park may dip below 4 per cent due to higher purchase prices.

When you apply for an investment loan, the lender calculates serviceability using the property's rental income, typically at 80 per cent of the appraised market rent to account for vacancies and management costs. The loan is then assessed at a rate at least three percentage points above the product rate under current APRA requirements. That buffer means even a modest rental income must cover repayments calculated at a much higher test rate than you will actually pay.

Consider a buyer who purchases a two-bedroom unit in South Perth for $600,000 with a 20 per cent deposit. The appraised rent is $550 per week. The lender applies 80 per cent of that figure, giving $440 per week or roughly $22,880 per year, and tests serviceability at the loan product rate plus three percentage points. If the investor has other income, the rental figure is added to that total. If they are relying solely on rental income to service the debt, the yield must be sufficient to pass serviceability at the elevated test rate, which is rarely the case without additional income sources.

How lenders treat rental income on your application

Lenders accept rental income as part of your total serviceability assessment. Most lenders will shade the appraised market rent by 20 per cent before adding it to your other income. If you already own investment properties, the net rental position on those assets, positive or negative, flows through to your current application. A negatively geared property reduces your borrowing capacity because the shortfall is deducted from your assessable income.

In a scenario where an investor already owns a property returning $400 per week but costing $550 per week in interest and holding expenses, the $150 per week shortfall is deducted from their salary before the lender calculates capacity for the next purchase. That dynamic makes portfolio growth harder as each subsequent property adds to the total debt servicing burden, even where tax deductions offset some of the loss at year-end.

Australian Prudential Regulation Authority serviceability rules apply across all lenders, though individual credit policies vary. Some lenders will accept a signed lease at a higher rent than the valuer's appraisal, while others apply the lower of the two figures. If you are refinancing an investment loan, the existing lease can sometimes support a stronger serviceability case than an appraisal, particularly where the tenant has been in place for several years and the rent has increased above initial levels.

Interest-only repayments and how they affect yield calculations

Interest-only repayments lower the monthly cost of holding an investment property and improve cash flow, which is why many investors choose this structure for the first few years. An interest-only loan on a $480,000 investment property at current variable rates might cost around $2,400 per month, compared to $2,900 per month on principal and interest. That $500 difference can turn a negatively geared property into one that is closer to neutral cash flow, assuming the rent covers most of the interest.

Lenders typically offer interest-only terms for up to five years on investment loans, after which the loan reverts to principal and interest unless you apply to extend the interest-only period. That reversion increases repayments substantially, so forward planning around cash flow is necessary. Investors who rely on a tight margin between rent and interest cost may find themselves under pressure when the principal component is added, particularly if they have not increased rent or reduced other debt in the interim period.

From a tax perspective, interest on borrowings used to acquire or hold a rental property is deductible against assessable income under current rules for properties held before mid-May 2026, and for new builds acquired after that date. Established properties purchased after mid-May 2026 are subject to quarantined loss rules from the 2027-28 income year, meaning losses can only be offset against other residential property income. That change affects the after-tax return on future purchases and may influence whether interest-only or principal-and-interest repayments deliver better long-term value, depending on your broader income position and portfolio structure.

Fixed or variable rates for investment property loans

Investment loan interest rates are typically priced higher than owner-occupier rates, with the margin reflecting the additional risk lenders assign to investment lending under APRA's prudential standards. Within the investment category, variable rates offer flexibility to make extra repayments and access offset accounts, while fixed rates lock in a known cost for a set period, usually one to five years.

An investor holding a South Perth apartment with a variable rate can redraw funds if the loan product allows it, or park surplus cash in an offset account to reduce the interest charged while maintaining access to those funds. That flexibility is useful where rental income fluctuates or where you plan to use equity for another purchase. Fixed rates remove that flexibility but provide certainty, which can be valuable if you are managing multiple properties and want predictable cash flow.

Some investors split their loan between fixed and variable portions to gain partial certainty while retaining some offset capability. That structure is more complex to manage and may involve higher ongoing fees, but it can suit buyers who want to hedge against rate rises without giving up all access to funds. Whether you are taking out a new loan or considering refinancing, the choice between fixed and variable depends on your cash flow needs, your view on future rate movements, and whether you plan to make lump-sum repayments or hold funds in offset.

Loan-to-value ratio and deposit size for investment loans

Most lenders cap investment loans at 90 per cent LVR, and many apply a lower threshold internally depending on their risk appetite and current portfolio composition. Borrowing above 80 per cent LVR attracts Lenders Mortgage Insurance, which is a one-off premium calculated on the loan amount and LVR. On a $720,000 loan at 90 per cent LVR, the LMI premium might be $25,000 or more, depending on the lender and insurer.

You can pay the LMI premium upfront at settlement or capitalise it into the loan, though capitalising increases your total borrowing and ongoing interest cost. For investors building a portfolio, minimising LMI by contributing a 20 per cent deposit or using equity from an existing property to cross-secure the new loan can reduce upfront costs. Cross-securitisation does mean the lender holds security over multiple properties, which can complicate future refinancing or sales, so it is worth understanding the trade-off before proceeding.

South Perth properties, particularly units in older buildings near the river, may be subject to additional lender scrutiny around body corporate health, sinking fund balances, and any major works planned or underway. Some lenders will decline or reduce the maximum LVR if the building has fewer than six units, or if the body corporate has insufficient reserves relative to upcoming expenditure. If you are buying an apartment in a smaller complex, check the body corporate records and recent meeting minutes before you apply for finance, as those details can affect both the loan amount and the valuation.

Vacancy rates and how they influence lending decisions

Vacancy rates in South Perth have historically remained low due to the suburb's proximity to the CBD, local schools, and established amenities. Lenders do not explicitly adjust rental income for suburb-level vacancy data, but they do apply a blanket 20 per cent shading to appraised rent, which is intended to cover vacancies, maintenance, and periods between tenants. In practice, a well-located property in South Perth near transport and the river is likely to experience shorter vacancy periods than a property in a fringe suburb, but the lender's serviceability calculation does not differentiate.

If you are purchasing a property that is currently tenanted, the existing lease provides evidence of actual rent achieved, which can support your application. A lease signed within the past six months at a figure above the valuer's appraisal may persuade some lenders to use the lease rent rather than the appraisal, though this is not guaranteed and depends on the lender's policy. If the property is vacant at purchase, you will need to rely on the valuer's opinion of market rent, and the lender will assess serviceability on that basis.

Debt-to-income limits and portfolio lending

From February 2026, lenders have been required to limit new investor loans to borrowers with a debt-to-income ratio of six times or greater to no more than 20 per cent of their total investor lending each quarter. That limit applies separately to owner-occupier and investor loans and is measured across the lender's entire portfolio, not on an individual borrower basis. In practice, it means that if your total debt, including the new investment loan, exceeds six times your gross income, the lender may decline your application or require a larger deposit to bring the ratio below the threshold.

For investors in South Perth who already hold one or more properties, the DTI limit can restrict further borrowing even where serviceability would otherwise be met. If your salary is $120,000 per year and your existing investment and owner-occupier debts total $720,000 or more, adding another investment loan may push you above the six-times threshold, particularly if the new loan amount is substantial. Some lenders will work within their 20 per cent allocation for high-DTI loans, but access is not guaranteed, and the approval may come with stricter conditions or a higher rate.

What property investors in South Perth should know before they apply

South Perth's established housing stock, characterised by older apartment blocks along the foreshore and a mix of post-war homes and townhouses inland, presents both opportunities and constraints for investors. Units near Mends Street and the ferry terminal typically deliver stronger rental demand due to proximity to transport, but body corporate costs can be higher, and lender appetite for older strata buildings varies. Standalone homes closer to Angelo Street and the Perth Zoo precinct attract long-term tenants, including families, but yield less due to higher purchase prices relative to rent.

When you apply for investment property finance, the lender will order a valuation that considers recent sales, building condition, and any factors that might affect resale value or rental appeal. Properties affected by aircraft noise, or those near main roads such as Canning Highway, may be valued more conservatively. If the valuation comes in below the purchase price, you will need to increase your deposit or renegotiate with the seller, as the lender will base the loan amount on the lower figure.

Call one of our team or book an appointment at a time that works for you to discuss your investment loan options and rental yield expectations before you make an offer.

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