The Pros and Cons of Acquiring Multiple Investment Properties

Building a portfolio of rental properties in Hornsby means borrowing against the equity you already own while managing regulatory settings that now limit how much lenders will advance.

The decision facing buyers who already own one or two rentals is whether to acquire a third or fourth property before the negative gearing quarantine begins on 1 July 2027, or to wait and target new builds that remain exempt. The answer depends on your debt-to-income position, the rental yield each property delivers, and whether you can service additional debt under the buffer lenders apply.

Borrowing Capacity Shrinks as the Portfolio Grows

Your borrowing capacity falls each time you add a rental property because lenders assess serviceability using a 3 percentage point buffer above the rate you will pay, and they discount rental income by around 20 per cent to allow for vacancy and holding costs. Consider a buyer who earns $140,000 as a PAYE employee, owns their home in Hornsby with $380,000 owing, and holds one older unit in Asquith returning $600 per week. Lenders assess the rental income at $480 per week after the haircut, then test whether the borrower can service all existing debt plus a new loan at the product rate plus 3 per cent. If that buyer applies for a second investment loan of $650,000, the buffer pushes the test rate above 9 per cent even when the actual rate is closer to 6 per cent. The outcome is a reduced maximum loan amount or a declined application if the debt-to-income ratio exceeds six times gross income.

From 1 February 2026, lenders operating under APRA's debt-to-income caps can approve no more than 20 per cent of new investor loans above a DTI of six. That ceiling applies across the entire portfolio, so a borrower with $2 million in total debt and gross household income of $300,000 sits at a DTI of 6.7 and falls into the restricted band. Some lenders exhaust their 20 per cent allowance early in the quarter and decline otherwise serviceable applications until the next reporting period.

Interest-Only Loans and the Cash Flow Trade-Off

Most borrowers acquiring multiple rentals choose interest-only repayments to preserve monthly cash flow and direct surplus income toward the next deposit. An interest-only period runs for one to five years depending on the lender, after which the loan reverts to principal and interest unless you refinance or renew the interest-only term. The monthly saving is significant when rates sit above 6 per cent. A $600,000 loan at 6.2 per cent on interest-only costs $3,100 per month, while the same loan on principal and interest over 30 years costs around $3,700. That $600 difference across three properties adds $1,800 each month, which can be directed to a deposit for the fourth property.

The disadvantage is that interest-only borrowers do not reduce the principal balance, so equity growth depends entirely on capital appreciation and any additional repayments made voluntarily. In a flat market or during a correction, the loan balance remains static while property values may fall, which can trigger a margin call if the loan-to-value ratio breaches the lender's covenant.

Negative Gearing Quarantine from 1 July 2027

Under the Treasury Laws Amendment (Tax Reform No. 1) Act 2026, net rental losses on established residential dwellings acquired on or after 7:30pm AEST on 12 May 2026 cannot be offset against salary or business income from 1 July 2027. Losses are quarantined and carried forward to offset future rental income or capital gains on residential property. Properties held before that date and time continue under the existing rules, so an investor who settled three units in Hornsby before May 2026 can still claim the full loss against wages indefinitely. The quarantine applies only to properties acquired after the cut-off, which means a mixed portfolio can carry some properties under old rules and others under the new regime.

Eligible new residential dwellings remain exempt. A new build is defined as a dwelling constructed on previously vacant land or a development that increases the number of dwellings on the site. A knock-down rebuild that replaces one house with one house does not qualify. A new build loses its exemption if it is occupied for more than 12 months before being sold to a subsequent investor, so buying a two-year-old former owner-occupied home does not restore access to negative gearing even if it was originally a new build.

The immediate effect for Hornsby buyers is that acquiring an established villa or older unit in Asquith or Waitara after 12 May 2026 means any shortfall between rent and the sum of interest, body corporate fees, council rates, and other deductible expenses cannot reduce your taxable wage income after 1 July 2027. The loss still exists and remains deductible, but it sits in a separate quarantine account and can only offset future rental profits or capital gains when you eventually sell. In our experience, borrowers who were relying on a $15,000 annual tax refund to fund living expenses or the next deposit find themselves short once the refund disappears.

The Role of Equity Release in Portfolio Growth

Borrowers acquiring a second or third rental typically draw on equity in their owner-occupied home or an existing rental rather than saving a full deposit in cash. Lenders will advance up to 80 per cent of the property's current value without requiring Lenders Mortgage Insurance, so a home in Hornsby valued at $1.4 million with $400,000 owing provides access to $720,000 in available equity before hitting the 80 per cent threshold. Releasing $200,000 of that equity for a deposit leaves $520,000 available for future acquisitions, assuming the property value remains stable and you continue to meet serviceability.

The constraint is that lenders assess the additional borrowing as part of total debt when calculating your debt-to-income ratio and running the serviceability buffer. Releasing $200,000 from your home increases your total debt by $200,000, which lifts your DTI and reduces the amount you can borrow for the actual purchase. That trade-off becomes more pronounced once you hold three or four properties, because the rental income assessed at 80 per cent after the vacancy discount no longer covers the interest cost tested at the buffered rate.

Capital Gains Tax Changes from 1 July 2027

From 1 July 2027, the 50 per cent CGT discount for individuals is replaced with cost base indexation and a minimum 30 per cent tax rate on real capital gains. The change applies only to gains accruing after 1 July 2027, so any appreciation up to that date remains eligible for the 50 per cent discount. If you bought a unit in Hornsby in early 2025 for $720,000 and it appreciates to $820,000 by 30 June 2027, the $100,000 gain accrued before the change continues under the old rules when you eventually sell. Any further appreciation after 1 July 2027 is subject to indexation and the 30 per cent minimum rate.

Eligible new builds retain an election between the 50 per cent discount and the indexed cost base with the minimum tax, which preserves the tax treatment that made new stock attractive. For established properties acquired after 12 May 2026, the combination of quarantined losses and the indexed CGT treatment means the tax benefit of holding multiple older rentals is substantially reduced. Buyers still acquire for capital growth and rental yield, but the wage offset that previously subsidised holding costs will no longer apply from mid-2027.

Variable Rate or Fixed Rate for a Growing Portfolio

Most borrowers acquiring multiple properties choose a variable rate or split the loan between variable and fixed. A variable rate allows unlimited additional repayments and provides access to offset accounts, which can hold surplus rent or savings and reduce the daily interest charge. An offset account linked to three loans can reduce the combined interest bill by tens of thousands of dollars each year if you park rental income, tax refunds, and other cash in the account rather than leaving it in a transaction account earning minimal interest.

Fixed rates lock in repayments for one to five years but carry break costs if you repay early or refinance before the fixed term ends. In a rising rate environment, fixing provides certainty, but in a falling or stable market the variable discount usually delivers a lower rate. We regularly see borrowers split each loan 50/50, fixing half for certainty and leaving half variable for flexibility. That structure provides a partial hedge without sacrificing access to offset or the ability to sell one property and repay that loan without penalty.

Call one of our team or book an appointment at a time that works for you using our online calendar. We work with investors across Hornsby, Asquith, Waitara, and Berowra, and we have access to investment loan options from banks and lenders across Australia.

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