Avoid These 5 Mistakes When Owning Multiple Properties

Adding another property to your portfolio is not the same as buying your first.

Once you own two or more investment properties, the lending conversation changes. Lenders assess your entire portfolio differently, serviceability gets tighter, and the structure you put in place now will either help or hurt your ability to keep building. If you are considering a second or third purchase in Randwick or elsewhere, understanding how lenders view multiple properties will save you from making decisions that lock you out of future growth.

Using Equity Without a Plan for Serviceability

Releasing equity from an existing property to fund your next purchase only works if you can service the additional debt. Lenders assess your ability to repay based on your income, existing loan commitments, and a buffer rate that is at least 3.0 percentage points above the actual rate you will pay. That buffer alone can reduce what you think you can borrow by tens of thousands of dollars, especially when you already have one or more investment loans on the books.

Consider a GP in Randwick who owns a home and one investment property in Maroubra. They have built up equity in both and want to release enough to cover a deposit on a unit near Prince of Wales Hospital. On paper, the equity is there. In practice, the rental income from the Maroubra property is discounted by the lender, sometimes by 20 per cent or more to account for vacancy and costs, and the serviceability test applies the buffer rate to all existing loans plus the new one. Even with a solid income, the application can fall short if the structure is not thought through before the valuation is ordered.

Choosing Interest-Only Without Understanding the Trade-Off

Interest-only repayments can improve cash flow in the short term, but they come with higher risk weights under the lending standards that took effect in mid-2025. That means lenders hold more capital against your loan, which often translates to a higher interest rate or stricter serviceability assessment. If you are building a portfolio, an interest-only loan on one property might make sense, but putting every loan on interest-only can limit your borrowing capacity for the next purchase.

In our experience, investors who split their loans between principal and interest on their earliest purchases and interest-only on later ones tend to have more room to move when they want to add another property. The principal and interest portion shows the lender that debt is being paid down, which can offset some of the serviceability drag from the interest-only loans. It is not about paying off the debt as fast as possible, it is about keeping the lender comfortable enough to say yes to the next application.

Ignoring the Debt-to-Income Limit Introduced in Early 2026

From February 2026, banks can only lend 20 per cent of their new investor loans to borrowers with a total debt-to-income ratio of six times or more. If your total borrowing across all properties is more than six times your gross annual income, you may still be approved, but you fall into a bucket that the lender is actively managing and rationing. That makes your application more sensitive to timing, policy changes, and how much of that 20 per cent allocation the lender has already used in the quarter.

This limit applies separately to investor lending, so your owner-occupied home loan does not count toward it, but every investment loan does. For a medical professional earning a gross income around the level common in Randwick, a debt-to-income ratio above six could mean total borrowing across investment properties in the range of several hundred thousand dollars or more, depending on individual circumstances. Once you cross that line, you have fewer lenders to choose from, and the ones that remain will look harder at your rental income, your cash reserves, and your repayment history.

Buying Established Properties After May 2026 Without Understanding the Tax Changes

Negative gearing still works, but not in the same way for every property. If you bought an established investment property after 12 May 2026, any loss you make from that property can only be offset against income from other residential investment properties, not against your salary. Losses can be carried forward, but they do not reduce your tax in the year you make them unless you have other property income to offset.

Properties you owned before that date, and new builds purchased after it, are still fully negatively geared in the traditional sense. If you are adding to your portfolio now, the tax treatment of the property you buy will depend on when you exchanged contracts and whether the property qualifies as a new build. Grandfathered properties keep their old treatment even if you refinance or switch lenders, but new established purchases are subject to the new rules from the 2027-28 income year onward. That changes the cash flow equation, especially in the first few years when expenses often exceed rent.

Not Structuring Loans to Preserve Future Flexibility

How your loans are structured across your portfolio matters more than most investors realise until it is too late. If you refinance or consolidate loans without considering how equity is accessed later, you can end up in a position where releasing equity from one property requires you to refinance others, triggering valuation risk, rate changes, or break costs on fixed terms.

We regularly see this with clients who have one loan secured against multiple properties. It makes the initial application simpler, but when they want to sell one property or access equity from another, the lender requires the entire facility to be restructured. That can mean revaluing properties in a softer market, or losing access to equity you thought was available. Splitting securities and keeping loans on separate titles takes more work up front, but it gives you control over each asset independently.

The same principle applies to offset accounts and redraw facilities. If you are using one offset account linked to multiple loans, the benefit is shared, but it is not always allocated where it is most useful. Structuring each investment loan with its own offset or using a principal and interest loan with redraw only where it suits your tax position will give you more control as the portfolio grows.

What This Means for Your Next Purchase

If you already own one or two properties and are looking at a third or fourth, your biggest constraint will not be the deposit. It will be serviceability, lender policy, and how your existing loans are structured. Before you start looking at properties, get your current position reviewed. That means understanding your borrowing capacity under current policy, not what it was two years ago, and identifying which lenders will still support your structure once you add another loan.

Randwick has a mix of units near the hospital precinct and older semi-detached homes closer to Coogee, and both attract solid rental demand from medical staff, students, and young professionals. But demand does not mean automatic approval. Lenders will look at your portfolio as a whole, and if your loans are not structured to support growth, you will hit a ceiling well before you run out of deposit or equity.

If you are weighing up whether to add another property, or if you have tried to borrow recently and been knocked back, the issue is usually fixable. It just needs to be fixed before you make an offer. Call one of our team or book an appointment at a time that works for you.

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