Interest-only home loans: when they make sense (and when they don’t)

An interest-only loan does exactly what it says: for a set period, usually one to five years, you pay only the interest, and the loan balance doesn’t shrink. Repayments drop noticeably, but you’re not paying anything off. Used deliberately, that’s a strategy; used by default, it’s expensive drift.

Why investors use interest-only

• Tax efficiency: investment loan interest is deductible; principal isn’t. Investors often keep investment debt interest-only while attacking their non-deductible home loan instead.
• Cash flow: lower repayments free up money for the next deposit or a renovation.
• Offset discipline: sophisticated borrowers pair interest-only with an offset, keeping the principal available rather than locked in the loan.

The costs to respect

• Interest-only rates are typically 0.2–0.6% higher than principal-and-interest.
• You pay more total interest over the loan’s life, the balance sits still for years.
• When the period ends, repayments jump: a 30-year loan with 5 years interest-only must repay the full balance over the remaining 25.
• Borrowing power is assessed on that shorter repayment period, so interest-only can reduce how much you can borrow.

When it makes sense for owner-occupiers

Rarely, and temporarily: parental leave, a genuine income gap, or bridging between properties. If lower repayments are needed long-term, the honest fix is usually a cheaper rate or a longer term, not pausing the principal.

Structure it deliberately

Interest-only is a tool, and tools suit jobs. Nathan can model whether it genuinely advances your plan, and which lenders price the interest-only period most sharply. See also our investment loans service.