- Interest-only repayments are lower but don’t reduce the loan balance
- Principal & interest builds equity but costs more each month
- Interest-only can improve short-term cash flow and deductibility
- The right choice depends on strategy, cash flow and how long you’ll hold
When you take out an investment loan, one early decision shapes your cash flow for years: do you pay interest-only, or principal & interest? Both are legitimate; they simply suit different strategies, and getting the fit right matters more than the label.
How the two differ
With principal & interest (P&I), each repayment covers the interest plus a slice of the loan itself, so the balance falls and your equity grows over time. With interest-only (IO), you pay only the interest for a set period (often up to five years), so repayments are lower — but the loan balance doesn’t reduce during that time.
The case for interest-only
Investors often favour IO for cash flow and tax reasons. Lower repayments free up cash to hold the property, cover costs, or service additional investments. And because — for an investment property — the interest portion is generally the tax-deductible part, keeping repayments as interest can suit some investors’ tax positions. The trade-off is that you’re not building equity through repayments.
The case for principal & interest
P&I is the more conservative path. You pay more each month, but you’re steadily reducing debt and building equity, and you typically access lower interest rates than IO loans. For investors focused on paying down debt or holding for the very long term, it’s often the stronger structure.
“Interest-only isn’t a loophole and principal & interest isn’t a virtue. Each is a tool — the question is which one your strategy needs right now.
— Meridian Research
The Meridian view
The right structure follows the strategy, not the other way around. Investors in an accumulation phase, buying multiple assets, often value the cash-flow flexibility of IO; those consolidating or nearing their goals often prefer the equity-building discipline of P&I. This is general information only and not credit advice — a licensed broker can model both against your numbers.
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