Avoid These 5 Mistakes When Buying Multiple Rentals

Adding a second or third rental to your holdings changes how lenders assess you.

Once you own one investment property, the rules shift. Lenders look at serviceability differently, your existing debt affects what you can borrow next, and recent changes to negative gearing and capital gains treatment mean the tax benefits that supported your first purchase may not apply the same way to your next.

Mistake 1: Treating Every Purchase Like the First

Each property you add increases your total debt and reduces your borrowing capacity for the next. Lenders assess serviceability using a buffer of three percentage points above the product rate, and they apply a debt-to-income cap that limits new investor lending at six times income to no more than 20 per cent of each lender's portfolio. Once you hold two or three properties, you may find yourself near or over that threshold with some lenders, even if your rental income covers the repayments. Consider a buyer who secured their first rental in Rockingham with 10 per cent down and variable interest-only repayments. Two years later, with equity gained and a second deposit ready, they applied for a loan on a unit in Mandurah. Despite strong rental income from both properties, the lender declined because the buyer's total debt sat at 6.4 times household income and the lender had already reached its DTI cap for the quarter. The buyer switched to a lender with more room under the cap and settled six weeks later. The loan amount was lower than expected because serviceability calculations now included both properties, but the purchase proceeded.

How Negative Gearing Rules Affect Your Next Purchase

From 1 July 2027, rental losses on residential properties bought after 7:30pm on 12 May 2026 cannot be offset against your wage or salary unless the dwelling is an eligible new build. Losses are quarantined and can only offset future rental income or capital gains from residential property. Properties you already own, or had under contract by that date, remain under the old rules and you can still claim losses against other income. If you are planning to acquire a third or fourth property after mid-2027, factor in that negative gearing will not reduce your taxable income in the same way. Your cash flow stays the same, but the tax refund that previously helped service the loan will not arrive. Lenders assess serviceability on net rental income, so if your property runs at a loss and you cannot offset it, you will need other income or equity to support the next purchase.

Mistake 2: Ignoring How Existing Debt Compounds

Your current investment loan balance does not disappear when you apply for the next one. Lenders add up all your commitments and assess whether you can service another. If your first property is on interest-only terms and the second is principal and interest, repayments on the second will be higher for the same loan amount. In our experience, buyers underestimate how much the combination of existing debt, living expenses, and the buffer rate reduces what they can borrow next. A buyer in Bunbury acquired their first rental with an 80 per cent loan and interest-only repayments. Eighteen months later, they had saved another deposit and wanted to buy a second property in the same suburb. The lender approved the second loan, but at a lower amount than expected because the interest-only term on the first loan was due to expire within two years and the lender calculated serviceability assuming principal and interest repayments on both loans. The buyer adjusted their search and bought a smaller unit rather than a house.

Mistake 3: Buying Established Dwellings Without Checking Negative Gearing Eligibility

An established dwelling bought after 12 May 2026 will not support negative gearing beyond 30 June 2027. Rental losses are quarantined from that date. If you are considering an older property because the price is lower or the rental yield is higher, calculate cash flow without assuming a tax refund. An eligible new build, defined as a dwelling on previously vacant land or a development that increases the total number of dwellings, allows you to claim losses against other income under the grandfathered rules. A knock-down rebuild that does not add dwellings does not qualify, and a new build that has been occupied for more than 12 months before you buy it loses eligibility for the next owner. Lenders do not enforce these rules, but your accountant will, and if your cash flow relies on a refund that does not arrive, serviceability becomes a problem at refinance or when you apply for the next property.

How Capital Gains Treatment Changes After July 2027

From 1 July 2027, the 50 per cent CGT discount is replaced with cost base indexation and a 30 per cent minimum tax rate on real gains for properties acquired after that date. Gains that accrued before 1 July 2027 on properties you already own remain under the current discount rules. Eligible new builds let you choose between the discount and indexation when you sell. If you are building a portfolio for long-term growth, the change affects how much of your gain you keep after tax. Indexation may reduce the taxable gain if you hold the property for many years in a rising inflation environment, but the 30 per cent minimum rate applies even if your marginal rate is lower. The main residence exemption is not affected, so if you later move into one of your rentals and establish it as your home, that exemption still applies to gains accrued during the period you lived there.

Mistake 4: Overlooking Equity Release and LVR Limits

Equity in your existing property can fund the deposit for the next, but lenders limit how much you can borrow against the combined portfolio. Most lenders cap lending at 80 per cent of the total value across all securities without Lenders Mortgage Insurance, and 90 or 95 per cent with LMI for specific lending scenarios. If you refinance your first property to release equity, the new loan amount increases your total debt and reduces borrowing capacity for the next purchase. Cross-collateralisation, where multiple properties secure a single loan, can make it harder to sell one property or refinance separately later. We regularly see buyers release equity from their owner-occupied home to fund an investment deposit, but they do not account for how the higher loan balance on their home affects serviceability when they apply for the investment loan weeks later. The lender assesses both loans together, and the result is a lower loan amount on the investment than expected.

Mistake 5: Not Structuring Loans to Support Future Growth

How you structure your first and second loans determines whether you can add a third or fourth. Splitting loans between fixed and variable, or between interest-only and principal and interest, gives you flexibility to manage repayments and access equity without refinancing the entire portfolio. Loan features such as offset accounts and redraws matter less for investment loans than for your home, because the interest is already deductible, but they still affect how you manage cash flow across multiple properties. If you fix the entire loan on your first property and rates fall, you are locked in. If you leave it all variable and rates rise, repayments increase across the portfolio and serviceability tightens for the next purchase. A split structure lets you manage both risks. Some lenders assess each property separately, others assess the portfolio as a whole. Knowing which lenders take which approach helps when you are planning your third or fourth purchase, because you can choose the lender that gives you the most capacity.

Building a rental portfolio in WA takes careful planning around structure, timing and the new tax rules. If you are ready to add your next property or want to understand how recent legislation affects your borrowing power, call one of our team or book an appointment at a time that works for you.

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