Financing is where most property investment plans either succeed or stall. The mechanics of investor lending in Australia are different from owner-occupier lending — different interest rates, different servicing rules, different LVR requirements, and different products. This guide covers everything you need to know about financing your investment property: loan types, deposit options, interest-only strategies, using equity, and how to give yourself the best chance of approval.
How Investment Loans Differ from Owner-Occupier Loans
Investment loans typically attract a higher interest rate than equivalent owner-occupier loans — usually 0.3–0.7% higher, depending on the lender and product. This reflects the slightly higher risk profile lenders assign to investment lending (investors are more likely to sell in a downturn than homeowners). The serviceability assessment is also more conservative — lenders shade rental income (typically accepting 75–80% of gross rent as assessable income) and apply a buffer rate (currently 3% above the actual rate) to stress-test your ability to repay. Lenders also differentiate between investment loans (used to purchase income-producing property) and owner-occupier loans — mixing these is a common tax error that reduces the deductibility of your interest.
How Much Deposit Do You Need?
For an investment property, most lenders require a minimum 20% deposit to avoid Lenders Mortgage Insurance (LMI). Some lenders will accept 10–15% with LMI, though LMI for investment loans is typically higher than for owner-occupied purchases. Unlike owner-occupiers, investors cannot access the First Home Guarantee (5% deposit, no LMI) — that scheme is reserved for owner-occupiers buying their principal place of residence. If your deposit is below 20%, model the LMI cost carefully — on a $600,000 investment property at 90% LVR, LMI can be $15,000–$20,000. This is typically capitalised into the loan, but it raises your LVR and ongoing interest cost.
Interest-Only vs Principal and Interest
This is one of the most important decisions in investment financing. Interest-only (I/O) loans mean you pay only the interest component each month — your repayment is lower, improving cash flow and serviceability for the next loan. The trade-off: you’re not reducing the principal, so the loan balance stays the same. Principal and interest (P&I) loans mean every repayment reduces the principal — you build equity faster and pay less total interest over the life of the loan, but monthly repayments are higher. Many experienced investors use I/O during the portfolio-building phase (maximising serviceability for additional purchases) then switch to P&I as the portfolio matures and income increases. I/O periods are typically limited to 5–10 years — plan your strategy before the I/O period expires.
Using Equity from Existing Property
If you already own a home or investment property with equity, you may not need to save a fresh cash deposit. Lenders will allow you to access up to 80% of your property’s current value minus the outstanding loan. This usable equity can fund the deposit and costs on your next investment property. The mechanism: you apply for a line of credit or equity loan against your existing property, draw the funds at settlement of the new purchase, and secure the new property with a separate investment loan. Keep the equity loan and the investment loan in separate accounts — mixing them with your home loan creates tax deductibility issues. A mortgage broker can structure this correctly for you.
Choosing Between Fixed and Variable Rates
Fixed rates offer certainty — you know exactly what your repayment will be for 1–5 years, making budgeting straightforward. Variable rates move with the RBA cash rate and lender decisions — they can go up or down. Historically, variable rates have saved money over time compared to fixed rates, but fixed rates provide peace of mind and protection against rate rises. For investment loans, a common strategy is to split the loan — fix 50–70% for rate certainty on the core amount, leave the rest variable for flexibility (redraw, extra repayments). Avoid fixing the full investment loan if you might need to break it — break costs (economic cost calculations) can be very expensive.
How to Maximise Your Borrowing Capacity
Key steps before applying for an investment loan: (1) Reduce all personal debt — pay off credit cards, close unused card limits, and pay down car loans. A $10,000 credit card limit reduces borrowing capacity by ~$50,000, even with a zero balance. (2) Increase income — salary increases, rental income from existing properties, and side income all help. (3) Keep living expenses low on paper — lenders assess your declared expenses. (4) Choose a lender who treats rental income favourably — some shade at 75%, others at 80%. This matters on a $2,500/month rental property. (5) Use a mortgage broker who specialises in investor lending — they know which lenders have the most investor-friendly policies at any given time.
Tax Deductibility: Keep Loans Clean
The ATO requires that borrowed funds be used exclusively for income-producing purposes for the interest to be deductible. This means: don’t mix your investment loan with your personal home loan. Don’t redraw from your investment loan for personal expenses. Keep separate offset accounts for investment vs personal use. If you contaminate an investment loan with non-investment funds (even once), you may lose deductibility on part of the interest — and untangling this is complex and expensive. Get this right from day one.
Financing an investment property correctly from the start sets the foundation for everything that follows. The right loan structure, the right lender, and a clean tax separation will serve you for the lifetime of the property — and make it significantly easier to finance the next one.
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General Advice Warning: This article is general in nature and does not constitute personal financial advice. Please consult a licensed financial adviser before making investment decisions.
