Unlock the Secrets to Building a Property Portfolio

Growing a property portfolio in Perth requires more than one good purchase.

You need a finance structure that lets you borrow again when the next opportunity arrives, without selling down or scrambling to refinance. The lenders and loan products you choose early on either support that growth or limit it. Most investors who stall after one or two properties do so because their borrowing capacity has hit a ceiling, not because they ran out of deposit.

How Lenders Assess Your Borrowing Capacity Across Multiple Properties

Lenders calculate serviceability by taking your income, subtracting your living expenses and existing debt commitments, and testing whether you can afford the new loan repayment at an interest rate at least 3 percentage points above the actual loan rate. For investment loans, rental income is included but heavily shaded, typically between 70 and 80 per cent of the lease amount to account for vacancies and maintenance. Each lender applies its own shading policy.

Consider a buyer who already owns an investment property in Baldivis returning $450 per week in rent. One lender might include $315 of that income in the serviceability test, another might include $360. That difference compounds across multiple properties. When you add a second or third property to the portfolio, you are carrying more debt, but the rental income credited back is discounted every time. The buffer requirement and the debt-to-income limit introduced in February this year add further constraints. Lenders now cap the number of new investor loans they can write to borrowers with a total debt-to-income ratio of six times or more, which affects high-income earners aiming to scale quickly.

Your borrowing capacity shrinks with each acquisition unless you actively manage it. That usually means selecting lenders with higher rental shading policies, keeping interest-only terms where appropriate to reduce repayment pressure, and timing purchases to align with income growth or equity release from existing properties.

Interest-Only Versus Principal and Interest Loans for Portfolio Growth

Interest-only loans reduce the monthly repayment and preserve borrowing capacity.

An interest-only loan on a $500,000 balance at current variable rates might cost around $2,100 per month in repayments, while a principal and interest loan on the same balance would sit closer to $3,000. That $900 per month difference is treated as available income when the lender assesses your next application. For investors focused on acquiring multiple properties rather than paying down debt, interest-only terms are often the better path, provided the rental income and capital growth support the strategy over time.

Interest-only terms are typically offered for a maximum of five years on investment loans, after which the loan reverts to principal and interest unless you refinance or request an extension. Some lenders allow interest-only periods up to 10 years, but availability varies. The loan-to-value ratio also matters. Most lenders restrict interest-only lending to a maximum LVR of 90 per cent, and some impose stricter caps at 80 per cent depending on the applicant's profile and the lender's risk appetite under the prudential framework.

Principal and interest loans reduce your debt over time and may attract a marginally lower interest rate, but they also reduce your serviceability for future borrowing. If your goal is to hold three or four properties within five years, the short-term cashflow benefit of interest-only usually outweighs the long-term interest cost. If you are holding a single investment property and focused on wealth accumulation through debt reduction, principal and interest makes more sense.

Using Equity to Fund Your Next Deposit Without Selling

Equity is the difference between what your property is worth and what you owe on it.

If your home in Joondalup has risen in value from $600,000 to $700,000 and you still owe $400,000, you have $300,000 in equity. Lenders will typically let you borrow against up to 80 per cent of the property's current value without requiring lenders mortgage insurance, which means you could access around $160,000 in usable equity to fund a deposit and purchase costs on your next investment property. Borrowing above 80 per cent is possible, but it triggers LMI, which adds to your upfront costs and is capitalised into the loan unless paid in cash.

Releasing equity does not require you to sell or move. You apply to increase the limit on your existing loan or take out a separate loan secured against the same property. The released funds are then used to settle the new purchase. The additional borrowing increases your repayment and is assessed for serviceability in the same way as a new loan, so your income and existing commitments still need to support the increase.

In our experience, investors who rely on saved deposits alone take years between purchases. Those who use equity strategically can acquire their second and third properties within 18 to 24 months, provided the properties they already own have appreciated and continue to generate rental income.

Variable or Fixed Rates for a Growing Portfolio

Variable rate loans give you flexibility to make extra repayments, redraw funds and access offset accounts without penalty.

Fixed rate loans lock in your repayment for a set term, usually between one and five years, but come with restrictions. Most fixed rate investment loans do not allow offset accounts, limit extra repayments to around $10,000 per year, and charge break costs if you refinance or sell before the fixed term ends. For a portfolio investor, those restrictions can be costly. If you need to refinance to release equity or restructure your loans to accommodate a new purchase, a fixed rate loan may prevent that without penalty.

Some investors split their loan between fixed and variable portions to balance rate certainty and flexibility. A 50/50 split gives you a partially hedged repayment while keeping enough of the loan variable to allow redraws, extra repayments or early exit without significant cost. The split does add complexity and may not suit every lender's product suite, so it is worth confirming availability before committing.

Variable rates also tend to include deeper discounts for investment loans with offset accounts and professional packages, particularly for borrowers with multiple properties. Those discounts can reduce your rate by 0.5 to 1.0 percentage points below the standard variable rate, depending on the lender and your loan size.

How the Negative Gearing Rules Changed in the 2026-27 Budget

Properties purchased before 12 May 2026 and new builds purchased after that date can still have losses fully offset against your wage or salary income.

Established properties purchased after 12 May 2026 are subject to new quarantining rules from the 2027-28 income year. Losses from those properties can only be offset against income from other residential properties, including rent and capital gains. Excess losses carry forward to future years and can be used when you sell or when your portfolio generates positive income. The rules do not prevent you from claiming interest, rates, insurance and other holding costs as deductions. They only limit which income those deductions can be applied against.

For investors building a portfolio now, the change makes new builds and pre-12 May 2026 properties more attractive from a tax perspective. It also changes the timing of when you want to acquire properties. If you purchase two properties in the same year and one is an established home and the other is a new build, the losses from the new build can still offset your wage income, while the losses from the established property are quarantined. That can influence the order in which you buy and the mix of property types in your portfolio.

The capital gains tax treatment also changed from 1 July 2027. Gains on residential investment properties are now taxed using cost base indexation and a 30 per cent minimum tax rate on real gains accruing from that date, rather than the previous 50 per cent discount. For properties held before 1 July 2027, gains are apportioned between the old and new rules based on the holding period. New builds remain eligible for both the old discount and the new indexed treatment, with the choice available at the time of sale.

Structuring Loans Across Multiple Properties to Protect Serviceability

Each loan in your portfolio should be set up as a separate facility secured against a specific property.

That means if you own three investment properties, you should have at least three separate loan accounts, even if they are all with the same lender. Keeping loans separate gives you flexibility to sell one property and discharge only that loan without disturbing the others. It also makes it easier to track deductible interest for tax purposes and to refinance individual properties without restructuring your entire portfolio.

Cross-securitisation, where multiple properties are used as security for a single loan or loan group, can limit your options later. If one property is cross-secured with another, you may not be able to sell or refinance one without the lender's consent to release the security. Some lenders require cross-securitisation to approve lending above a certain LVR or to support a complex application, but it is worth avoiding where possible.

Offset accounts should also be linked to the highest-balance loan or the loan with the highest interest rate, as that is where the offset delivers the most value. If you have a $600,000 loan at 6.5 per cent and a $300,000 loan at 6.0 per cent, linking your offset to the larger loan saves more in interest. Some lenders allow multiple offset accounts linked to different loans within the same portfolio, which can be helpful if you are managing rental income separately or splitting funds between properties.

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