The Property Finance Broker

A Smart Strategy or a Risky Shortcut?

By Joshua Beniston  •  April 2026

Interest-only loans get a bit of a mixed reputation. Some investors swear by them. Others have been caught out when the loan rolls over and repayments jump. The truth? They’re a tool — and like any tool, they work brilliantly when used correctly and cause problems when they’re not.

Here’s a plain-English look at how interest-only loans work, who they’re suited to, and the risks you need to know about before you sign on the dotted line.

So What Actually Is an Interest-Only Loan?

With a standard principal and interest (P&I) home loan, every repayment covers two things: the interest charged for that period, plus a portion of the actual loan balance (the principal). Over time, you’re slowly paying down what you owe.

With an interest-only loan, you’re only paying the interest for a set period — typically 1 to 5 years. Your repayments are lower, but the loan balance doesn’t reduce. Once the interest-only period ends, the loan reverts to P&I, and your repayments will increase — sometimes significantly.

Example: On a $600,000 loan at 6.5% interest, a P&I repayment might be around $4,000 per month. On interest-only, that drops to approximately $3,250 — a saving of $750 per month during the IO period.

Why Would Anyone Choose This?

For property investors, there’s a strong case to be made. Here’s the thinking:

Cash flow

Lower repayments mean better monthly cash flow. For an investment property, this can make the difference between a property being positively geared (or at least less negatively geared) and putting pressure on your finances each month.

Tax deductibility

The interest on an investment loan is generally tax deductible (always confirm with your accountant). When you’re on interest-only, your entire repayment is interest — meaning potentially the full repayment may be deductible. On a P&I loan, the principal component is not deductible.

Capital growth focus

Some investors prioritise capital growth over equity building. The logic is: why aggressively pay down a tax-deductible investment loan when you could use those extra funds elsewhere — such as an offset account on your home loan (which is not tax deductible)?

The Risks and Downsides

Interest-only loans are not without their pitfalls — and this is where people sometimes come unstuck.

• You’re not building equity. The property value might be growing, but your loan balance isn’t shrinking. If the market dips, you could end up in negative equity.
• Repayments jump when the IO period ends. This is probably the most common surprise. When your loan rolls to P&I, you’re repaying the full principal over a shorter remaining term. Plan for this ahead of time.
• Harder to get approved. Since the financial crisis, lenders have tightened IO lending — particularly for owner-occupiers. You’ll need to demonstrate you can genuinely service the P&I repayments, not just the interest-only amount.
• Not for owner-occupiers without a plan. If you’re not an investor and you’re choosing IO purely to reduce repayments, you need to be very clear about what your plan is when the IO period ends.

When Does an Interest-Only Loan Make Sense?

Here’s a simple checklist to help you decide:

• You’re purchasing an investment property and want to maximise cash flow.
• You have a non-deductible home loan and want to direct extra funds to offset that instead.
• You’re a developer or investor with a short-term hold strategy (e.g., buying, renovating and selling within the IO period).
• You have a clear plan for when the IO period expires — whether that’s refinancing, selling, or absorbing the higher repayments.

Interest-only loans are generally not the right fit for owner-occupiers who simply want to reduce their repayments long-term, or for anyone who hasn’t thought through what happens when the IO period rolls over.

A Quick Note on Current Conditions

Lenders have varying policies on interest-only lending, and serviceability assessments have become more thorough in recent years. Some lenders are also more competitive than others on IO rates. Getting the right lender for your situation — not just the cheapest headline rate — is genuinely important here.

The Bottom Line

Interest-only loans are a legitimate strategy when used intentionally and with clear goals. They’re not a shortcut to affordability, and they’re not something you want to set and forget. But in the right hands, they can be a really effective tool for building a property portfolio.

If you’re weighing up whether an interest-only loan makes sense for your next purchase, let’s have a chat. We’ll help you run the numbers, understand the implications, and find a structure that fits your goals — not just your budget today.

Reach out anytime — keeping things simple is what we do.