Investment Property Loans Explained: Interest-Only vs Principal & Interest
How investment loans differ from home loans, when to choose interest-only, and the tax considerations every Australian investor should know.
Investment loans aren't just home loans with a different label. The structure determines your monthly cash flow, tax deductibility, equity growth and how easily you can scale into a second or third property.
How investment loans differ from owner-occupier loans
- Rates are typically 0.20–0.40% higher than owner-occupier rates.
- Lenders apply tighter serviceability buffers.
- Interest-only periods are far easier to get on investment loans.
- All interest charged is generally tax-deductible against rental income.
Interest-Only (IO): the cash flow play
On an interest-only loan you don't repay any principal during the IO period (usually 1–5 years). Your monthly cost is lower, freeing up cash flow for other investments or a renovation. Because every dollar of repayment is tax-deductible, IO is popular with investors holding negatively-geared properties.
Principal & Interest (P&I): the equity play
P&I repayments build equity from day one. If you plan to hold long-term and want the property paid off, P&I is mathematically cheaper over the full loan life. Many lenders also offer sharper rates on P&I investment loans.
When to use each
- IO: high marginal tax rate, growing portfolio, redirecting savings to other deposits.
- P&I: stable single property, paying down for retirement, lower tax bracket.
