An interest-only loan lets a borrower pay just the interest charged on the home loan for an agreed period, usually between one and five years, without reducing the amount borrowed. Repayments are lower while the arrangement lasts, then rise once the loan moves back to principal-and-interest payments.
The structure suits specific situations, most commonly investment strategies and short-term cash-flow pressure, but it carries a real cost: the balance does not move during the interest-only period, so more interest is paid across the life of the loan and the repayment step-up needs planning.
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How an interest-only loan works
During the interest-only period, each payment covers the interest accrued for that month and nothing else. The debt stays exactly where it started, which is the feature that frees up cash flow and also the source of every downstream risk. Interest-only terms are common on investment lending and available on some owner-occupied products at lender discretion.
What happens when the period ends
When the interest-only term expires, the loan reverts to principal and interest repayments calculated over the remaining years of the original term. Because the same balance now has fewer years to be paid off, the new repayment is materially higher than the old one. Interest-only pricing is also often set above equivalent standard-variable rates, reflecting the way lenders view the risk.
When the lower repayments earn their place
The structure earns its keep in narrow cases. An investor might use it while a property is being renovated ahead of tenancy, or to hold borrowing capacity for another purchase. A business owner with lumpy income might smooth expenses across the year. Where the loan funds an income-producing property, the interest may be tax-deductible, but deductibility depends entirely on the client’s circumstances and current tax law, so treat it as an accountant’s confirmation rather than a broking assumption.
The true cost of paying interest only
Three costs deserve a clear explanation to the client. First, total interest across the life of the loan will be higher because no principal is retired during the interest-only years. Second, no equity builds from repayments, so a market downturn can leave the balance close to or above the property’s value. Third, the repayment jump at expiry can strain budgets that were sized around the lower figure, particularly where rents or incomes have not moved.
How lenders assess these applications
Lenders do not size the loan around the low headline repayment. Most assess serviceability on what the repayment would be at principal and interest, then apply their buffer on top, so choosing interest-only rarely lifts borrowing capacity. Applications are still judged on income, existing commitments and credit history, and investment loans generally carry tighter settings than owner-occupied equivalents, including lower maximum LVRs and shorter interest-only allowances.
Building the exit before it arrives
The workable habit is to plan the switch from day one. Model the post-period repayment now, and where the client’s budget allows, park the difference in an offset so the transition is funded before it lands. Refinancing to a fresh term can soften the step-up by spreading the balance over new years, but that option depends on exit fees, current pricing and the lending criteria in force when the client applies, none of which should be promised in advance.
Before you recommend an interest-only structure, run the numbers both ways, confirm the tax position with the client’s accountant where a deduction is part of the case, and diarise a review twelve months before expiry. If property values in the client’s local housing market have softened by then, an earlier refinancing conversation beats a forced sale.
