Property investment remains one of Australia’s most popular wealth-building strategies — and for good reason. But investment property finance is structured differently to an owner-occupied home loan. Getting the loan structure right from the start can make a significant difference to your after-tax returns and long-term portfolio growth.
How Investment Loans Differ From Owner-Occupied Loans
Lenders treat investment properties as higher risk than owner-occupied homes. As a result:
Interest rates on investment loans are typically 0.3%–0.7% higher than equivalent owner-occupied rates
Maximum LVR is usually 90% (vs 95% for owner-occupied with LMI)
Lenders apply stricter serviceability assessments — even if rental income partially offsets the cost
Interest-only periods are more commonly used for investment loans than owner-occupied
Use the calculator below to estimate your borrowing capacity before speaking to a lender.
💰 Borrowing Power Calculator
Interest-Only vs Principal and Interest for Investors
One of the most important loan structuring decisions for property investors is whether to take an interest-only (IO) or principal and interest (P&I) loan.
Run the numbers on both scenarios using our repayment calculator below.
📅 Repayment Calculator
Interest-Only Loans
With an IO loan, you only pay the interest each month — not the principal. This keeps repayments lower in the short term, which maximises the tax-deductible interest expense and improves cash flow.
IO periods are typically available for 1–5 years. After the IO period ends, the loan reverts to P&I repayments — which will be higher, as you’re now repaying the principal over a shorter remaining term.
Principal and Interest Loans
P&I loans reduce the debt over time, building your equity faster. The trade-off is higher monthly repayments and a lower tax deduction (as a smaller portion of repayments is interest over time).
| 💡 Many investors use IO loans in the early years to maximise cash flow and tax deductibility, then switch to P&I as equity grows and income increases. |
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Using Equity to Fund Your Investment
One of the most powerful strategies available to Australian property investors is using the equity in an existing property to fund the deposit on an investment property.
If your home has grown in value, the equity can be accessed through a top-up of your existing loan or a separate line of credit. This means you may be able to buy an investment property with little to no cash savings.
If you’re planning to use equity from your existing home as a deposit, it’s worth understanding how deposit size affects your overall costs. Read our guide on how much deposit you really need for a full breakdown of LVR, LMI, and low deposit options.
How Rental Income Affects Your Borrowing Capacity
Rental income can boost your borrowing capacity — but lenders don’t apply it at face value. Most lenders assess rental income at 70%–80% of gross rent to allow for vacancy periods and property expenses. This is known as the rental income ‘shade’ or ‘buffer’.
For a property generating $30,000 per year in gross rent, a lender might only count $21,000–$24,000 towards your income assessment. Your broker can help you choose lenders with more favourable rental income policies if this is a constraint.
Loan Structuring: Keeping Investment and Personal Debt Separate
This is one of the most important — and most commonly misunderstood — aspects of investment property finance. From a tax perspective, it’s critical to keep your investment loan completely separate from any owner-occupied debt.
Don’t mix investment and personal borrowings in the same loan facility
If you have an owner-occupied offset account, don’t use it to offset your investment loan — you’d lose the interest deduction
Use a separate offset account on your home loan to reduce non-deductible interest while preserving full deductibility on the investment loan
| ⚠️ Tax information in this article is general in nature. Always consult a registered tax agent or accountant for advice specific to your investment structure. |
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What Lenders Look For in Investment Loan Applications
In addition to the standard income and credit checks, lenders assessing investment loan applications will look closely at:
Total exposure — how much overall debt you have across all properties
Rental yield — whether the investment is likely to be self-sustaining
LVR across your portfolio — lenders may cap total LVR across multiple properties
Employment stability — consistent income is especially important given higher loan values
Existing equity — a strong equity position gives lenders confidence
You can also run a quick Loan Check to get a sense of how your application might look before you approach a lender.
Frequently Asked Questions
Yes — this is one of the most common strategies used by Australian property investors. A broker can assess how much usable equity you have and structure the borrowing to keep your investment debt separate from your home loan.
Most lenders cap investment lending at 90% LVR. Borrowing above 80% LVR typically requires LMI. Some lenders are more flexible than others — a broker can identify the right lender for your LVR position.
Generally yes — interest on a loan used to purchase an income-producing investment property is tax deductible. However, the rules are complex and depend on how the loan is structured. Always consult a registered tax agent.
For many investors, yes — particularly in the early years. IO loans maximise deductible interest and improve cash flow. However, this isn’t suitable for every investor. A broker can help you model both options.
Yes, though you’d miss out on first home buyer grants and concessions, which generally require owner-occupation. Some buyers purchase an investment property first and rent it out while they continue renting themselves — sometimes called ‘rentvesting’.
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