AU Investment Loan Calculator
Compare investment property loan rates vs owner-occupier. See the APRA premium, IO vs P&I trade-offs, LVR-based rate tiers, and portfolio lending challenges. Includes cross-collateralisation risk analysis. AUD.
IO loans maximise tax-deductible interest and improve short-term cash flow, but you pay a higher rate and build no equity during the IO period.
As your property portfolio grows, lending becomes progressively more complex — fewer lenders, stricter assessment, and different products.
| Portfolio Size | Lender Assessment | Typical Products | Key Challenges |
|---|---|---|---|
| 1 property | Standard residential | All major banks, full product range | Minimal — treated like standard owner-occupier |
| 2–4 properties | Portfolio review | Major banks with conditions | Negative gearing income treatment, aggregate exposure limits |
| 5–9 properties | Complex — full portfolio income/expense review | Fewer major banks; non-bank lenders | APRA portfolio limits, some lenders decline at 5+; debt serviceability tightens |
| 10+ properties | Commercial-style assessment | Commercial lenders, private lenders, SMSF | Residential lenders often decline; commercial rates apply; LVR may be capped at 65% |
Investment Property Loans in Australia
Investment property loans in Australia are priced higher than owner-occupier loans due to APRA capital requirements — Australian Prudential Regulation Authority rules require banks to hold more capital against investor mortgages, increasing their cost of funding. This is passed on to borrowers as a rate premium of 0.25% to 0.50% above the equivalent owner-occupier rate.
Additionally, interest-only (IO) investor loans — popular because all interest is tax-deductible — carry a further premium of 0.20% to 0.40% above principal-and-interest rates.
Example: Investor Rate vs Owner-Occupier Rate
David buying an investment house in Perth, $600,000 loan at 80% LVR
| Owner-Occupier P&I rate | 6.50% |
| Investor P&I rate | 6.80% (+0.30%) |
| Investor IO rate | 7.10% (+0.60%) |
| Monthly payment (IO) | $3,550 |
| Monthly payment (P&I) | $3,879 |
| Weekly rent income | $550 |
| Monthly cash flow (IO) | +$229 (gross) |
| Monthly cash flow (P&I) | –$100 (negatively geared) |
IO gives better short-term cash flow but higher total interest cost. Many investors choose IO for tax reasons — the interest portion is fully deductible, but no equity is built during the IO period.
APRA Buffer and Serviceability Assessment
Since 2021, APRA requires all lenders to assess loan serviceability at the borrower's interest rate plus a 3% buffer. For an investor on 6.80%, the bank assesses whether you can afford repayments at 9.80%. This significantly reduces borrowing capacity compared to pre-APRA era lending.
For portfolio investors, banks also assess serviceability across all existing debts — not just the new loan. A borrower with four investment properties may find the fifth loan difficult to get, not because of income but because the total buffered repayments exceed the serviceability limit.
Cross-Collateralisation — Handle With Care
Cross-collateralisation (or "cross-securitisation") is when a lender uses two or more properties as combined security for multiple loans. While it can make it easier to access equity initially, it creates significant risks:
- You cannot sell one property without lender consent and reassessment
- Refinancing to a better deal is extremely complex — you cannot move one loan without the other
- If property values fall, the lender can demand additional security across your entire portfolio simultaneously
Most mortgage brokers recommend keeping investment properties as separate security wherever possible, even if it means slightly more paperwork to access equity.