Why Rental Yield Matters for Investment Loans

Rental yield determines how much income your investment property generates relative to its value, and lenders use it to assess how much you can borrow.

For investors in Watsonia, where established homes near Watsonia Village and newer units around the railway station attract different tenant profiles, the difference between gross and net yield changes which property type you can afford to hold. A unit returning 5 per cent gross yield might look stronger than a house at 3.5 per cent, but once you account for body corporate fees, the net position shifts. Lenders assess your borrowing capacity based on net rental income, not the advertised gross figure.

How Lenders Calculate Rental Income for Serviceability

Lenders apply a shading percentage to your rental income before adding it to your serviceability assessment. Most lenders shade rental income by 20 per cent, meaning they assess your property as earning 80 per cent of the lease amount. Some lenders apply a higher shade if vacancy rates in the area are elevated or if the property is still under construction.

Consider an investor purchasing a two-bedroom unit in Watsonia with rental income of $450 per week. The lender assesses that income at $360 per week after shading. If the loan is structured as interest-only at current variable rates, the repayment might be around $650 per week, leaving a weekly shortfall that needs to be covered by the investor's other income. That shortfall is where your salary, business income or other rental properties come into play during the application.

Lenders also assess the loan at a serviceability buffer of 3 per cent above the actual interest rate. That means even if your loan rate is lower, the bank tests whether you could still afford repayments if rates increased by 3 percentage points. The shaded rental income and the buffer work together to determine your maximum loan amount.

Gross Yield vs Net Yield in Watsonia

Gross rental yield is calculated by dividing annual rent by the property's purchase price and multiplying by 100. Net yield deducts ongoing costs such as council rates, insurance, property management fees, body corporate fees and maintenance before dividing by the purchase price.

In Watsonia, a villa unit with quarterly body corporate fees of $1,200 to $1,500 and a standalone house with no strata costs will show very different net yields even if the gross figures are similar. Investors often focus on gross yield when comparing properties, but net yield is what determines your actual cash position each year and how sustainable the holding costs are if the property sits vacant for a period.

When applying for an investment loan, the lender does not directly assess net yield, but the costs that reduce your net yield also reduce your overall serviceability because they are ongoing financial commitments.

Interest-Only Loans and Yield Requirements

Interest-only repayments reduce your weekly or monthly loan cost, which improves cash flow in the early years of ownership. Most lenders offer interest-only periods of up to five years on investment loans, after which the loan reverts to principal and interest unless you apply to extend the interest-only term.

An investor holding a property with a lower rental yield may find that principal and interest repayments create a larger gap between income and expenses. Switching to interest-only reduces that gap and allows the investor to hold the property without drawing heavily on other income sources. However, interest-only loans generally attract a slightly higher interest rate than principal and interest loans, and lenders apply higher risk weightings under APRA Prudential Standard APS 112, which can flow through to pricing.

You can structure a loan with a portion on interest-only and a portion on principal and interest, which allows you to pay down some debt while still managing cash flow. Some investors use this structure to keep one loan interest-only while making extra repayments into an offset account linked to another loan, maintaining flexibility without locking funds into the loan itself.

How Deposit Size and LVR Affect Loan Approval for Lower Yield Properties

If your property's rental yield is low relative to the loan amount, lenders rely more heavily on your other income to meet serviceability requirements. A larger deposit reduces the loan amount and the size of the repayments, which improves your serviceability position even if the yield remains the same.

Lenders Mortgage Insurance is required on most investment loans where the loan-to-value ratio exceeds 80 per cent. The LMI premium is calculated based on the loan amount and the LVR, and it is generally capitalised into the loan or paid upfront at settlement. Borrowers purchasing property with a lower yield and a high LVR may find that the additional LMI cost combined with lower rental income makes the investment difficult to hold in the first few years, particularly if interest rates rise.

Some lenders will lend up to 90 per cent or occasionally 95 per cent of the property value for investment purposes, but at higher LVRs the interest rate and LMI premium both increase. Investors in Watsonia purchasing an older home close to the Greensborough border may be buying for land value and future development potential rather than immediate yield, in which case a lower LVR and longer holding period become part of the strategy.

Using Equity from Your Watsonia Home to Fund an Investment Purchase

If you own a home in Watsonia and have built up equity, you may be able to use that equity as a deposit for an investment property without selling your existing home. Lenders assess the combined serviceability of both loans, including the rental income from the investment property and your ongoing repayments on the owner-occupied loan.

Equity is the difference between your property's current value and the amount you owe on the mortgage. Lenders typically allow you to borrow up to 80 per cent of your home's value without LMI, meaning you can access equity up to that threshold. If your Watsonia home is valued at a level that provides sufficient equity, you can use those funds as a deposit and avoid having to save a separate cash deposit for the investment loan.

Rental income from the new property is shaded and added to your income, while the new loan repayments are added to your liabilities. If the investment property has strong rental yield, it may support most of its own servicing, but if the yield is lower, your existing income and equity position become more important in the assessment.

Why Vacancy Rate and Tenant Demand Matter to Lenders

Lenders consider the likelihood of ongoing rental income when assessing an investment loan application. Properties in areas with low vacancy rates and strong tenant demand are viewed as lower risk because the income stream is more reliable. Watsonia benefits from proximity to La Trobe University, Northland Shopping Centre and the Hurstbridge railway line, which supports tenant demand from students, healthcare workers and families.

Some lenders apply a higher shading percentage to rental income in areas where vacancy rates are above the metropolitan average, or where the property type has a history of longer vacancy periods. A lender might also apply additional servicing overlays if the property is in a regional area or a location with high supply of similar stock.

If you are purchasing a property in a suburb with strong tenant demand and low vacancy, your serviceability position improves because the lender has more confidence in the ongoing rental income. That confidence can translate to a higher borrowing capacity or access to a wider range of investment loan options from lenders who otherwise apply conservative overlays.

Tax Deductions and Cash Flow

Interest on an investment loan is deductible against rental income and other income under current tax rules, provided the property is rented or genuinely available for rent. Ongoing costs including council rates, insurance, property management fees, repairs and depreciation are also deductible.

For properties held before the legislative changes introduced in the Treasury Laws Amendment (Tax Reform No. 1) Act 2026, negative gearing continues to apply in full, meaning any loss from the investment property can be offset against salary, business income or other assessable income. Properties acquired after 12 May 2026 that are not eligible new builds are subject to revised negative gearing rules from the 2027-28 income year, where losses can only be offset against income from other residential properties.

The deductibility of interest does not change the upfront cash flow position, but it reduces your taxable income and increases your tax refund or reduces your tax payable at the end of the financial year. Investors often structure their loans and holding costs to maximise deductions while maintaining sufficient cash flow to cover the gap between rental income and expenses during the year.

Choosing Between Variable and Fixed Rates for Investment Property

Variable rate loans allow you to make extra repayments, redraw funds if the loan permits, and link an offset account to reduce interest without locking funds into the loan. Fixed rate loans provide certainty over repayments for a set period, typically one to five years, but generally do not allow extra repayments beyond a small annual threshold and do not offer offset accounts.

Investors holding property with lower rental yield often prefer variable rates because the flexibility to make lump sum repayments or use an offset account allows them to reduce interest costs when cash flow improves. Investors purchasing property in Watsonia with strong yield and stable income may choose to fix a portion of the loan to lock in repayments and improve budgeting, particularly if they expect interest rates to rise.

Some lenders offer investment loan products with rate discounts for larger loan amounts or lower LVRs. Those discounts apply to the variable rate and can make a material difference to your annual interest cost and overall cash flow. When comparing loan options, the interest rate is only one factor - serviceability overlays, LVR limits, offset availability and the lender's treatment of rental income all affect which loan structure works for your circumstances.

Your loan structure should reflect your investment strategy, your cash flow position and how long you intend to hold the property. Call one of our team or book an appointment at a time that works for you.

Frequently Asked Questions