How you structure an investment loan changes your cash flow now and your total cost over the life of the loan. The interest-only versus principal-and-interest decision is one of the bigger levers, and it's worth getting deliberate about.
The difference, simply
Interest-only (IO): for a set period you pay only the interest, so the loan balance doesn't move. Principal and interest (P&I): every repayment chips away at the balance as well as the interest, so the loan is fully repaid by the end of the term.
Interest-only
Upside: lower repayments during the IO period, which frees up cash flow; the interest on an investment loan is generally tax-deductible; and the flexibility can suit investors directing money elsewhere. Downside: the balance doesn't fall, so you pay more interest overall, and there's a step-up in repayments — sometimes a sharp one — when the IO period ends.
IO periods typically run up to around five years, with some lenders going longer; the exact term depends on the lender.
Principal and interest
Upside: you pay less interest over the life of the loan, often on a lower rate, and you build equity from day one. Downside: higher repayments, which tightens short-term cash flow, and it can be less tax-efficient on an investment loan.
How to choose
Start with what the property needs to do in your plan. IO can make sense when cash flow or maximising deductible debt matters and you have a clear plan for when it ends. P&I suits building equity and minimising total interest. Your objectives, your cash-flow headroom, your risk tolerance and your tax position all feed in — and because the step-up at the end of an IO period catches people out, it's worth modelling before you commit.
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Book a Clarity Call — It's FreeCommon questions
Is interest-only good for an investment property?
It can be — lower repayments improve cash flow and the interest is generally tax-deductible. The trade-offs are that you pay more interest overall and face a repayment step-up when the interest-only period ends, so it needs to fit a clear plan.
How long can you have interest-only on an investment property?
Typically up to around five years, though some lenders offer longer. The maximum depends on the lender and your circumstances.
Should I pay principal and interest or interest-only?
P&I builds equity and costs less interest overall; interest-only frees up cash flow and can be more tax-efficient on an investment loan. The right choice depends on your goals, cash flow and tax position — worth modelling both.
This article is general information only and doesn't take your personal circumstances into account. It isn't financial, tax or investment advice. Tax rules and lender policies change — confirm your position with a licensed professional or the ATO before making decisions.
