Key takeaways
- You pay only interest for a set period, so repayments are lower — but the debt doesn’t shrink.
- When the period ends, repayments step up as principal-and-interest over fewer years.
- They mainly suit investors and specific cash-flow situations, rarely long-term owner-occupiers.
- Plan for the reversion before it hits — it’s where borrowers get caught out.
Interest-only is one of those features that’s neither good nor bad — it’s a tool that fits a specific job. Get the job right and it improves your cash flow and, for investors, your tax position. Get it wrong and you’ve spent years paying interest without touching the debt. Knowing which camp you’re in is the whole game.
How it works
For an agreed period — often one to five years — your repayments cover interest only. They’re lower because you’re not repaying principal. But the balance stays put: a $500,000 loan is still $500,000 when the period ends. At that point it reverts to principal-and-interest over the remaining years, and because you’re now repaying the full amount in less time, repayments rise.
Why investors use it
For an investment property, interest is generally deductible while principal repayments aren’t, so many investors keep the loan interest-only and direct spare cash to other goals — or into an offset account. It pairs closely with a negative gearing strategy. As always with tax, the specifics belong with your accountant.
The reversion is the risk. Borrowers who set-and-forget can face a repayment jump they didn’t plan for. The fix is simple: know your reversion date, budget for the step-up, and review your loan well before it arrives — sometimes a refinance or restructure is the right move.
Owner-occupiers: usually think twice
If you’re living in the home, interest-only means no equity built through repayments and more interest paid overall. It can make sense for a defined short-term reason, but as a default it’s rarely the owner-occupier’s friend. Your rate structure and borrowing power deserve as much attention as the interest-only question.
Broker Insight. The trap we see most is the reversion — the day repayments step up. We make sure clients know that date and plan for it well before it arrives.
Structure the loan around your strategy
Whether you’re investing or buying to live in, we’ll set the loan up to match your goals — and make sure the reversion never catches you out. Free, no obligation.
Book your free game plan callFrequently asked questions
How does an interest-only loan work?
For a set period — commonly one to five years — you pay only the interest, not the principal, so your repayments are lower. The loan balance doesn’t reduce during that time. When the interest-only period ends, the loan reverts to principal-and-interest over the remaining term, which means noticeably higher repayments because you’re now paying down the same debt over fewer years.
Who should use an interest-only loan?
They mainly suit property investors, who often prefer to keep repayments low and interest deductible while directing spare cash elsewhere, and some owner-occupiers with a specific short-term cash-flow reason. They’re rarely ideal for owner-occupiers long term, because you build no equity through repayments and pay more interest overall. The right choice depends on your strategy — and for investors, tax advice matters too.
What happens when the interest-only period ends?
The loan switches to principal-and-interest for the rest of the term, and repayments jump — sometimes sharply — because the principal is now repaid over fewer years. This is the moment that catches borrowers out. Planning ahead, whether by budgeting for the step-up or reviewing your options before it hits, is essential.
This guide is general information only and does not take your personal circumstances into account. It is not financial or credit advice. Government schemes, lender policies, rates and tax rules change over time and eligibility criteria apply. Speak with us for advice tailored to your situation.