Investment Loans: What to Know Before Buying Property

The structure of your investment loan matters as much as the property you purchase.

If you're considering property investment in northeast Melbourne, the difference between an interest-only loan at a variable rate and a principal-and-interest loan at a fixed rate could shift your cash flow by hundreds of dollars per month and change whether a property delivers positive or negative returns. Understanding investment loans means matching the loan features to what you're trying to achieve, not just securing approval.

How Interest-Only Loans Affect Monthly Cash Flow

An interest-only loan allows you to pay only the interest portion for a set period, typically five years. This reduces monthly repayments and can improve cash flow in the early years of ownership.

Consider an investor who purchases a two-bedroom unit in Doncaster for $650,000 with a 20% deposit. The loan amount is $520,000. At current variable rates, an interest-only repayment might sit around $2,300 per month, while a principal-and-interest repayment could be closer to $3,100. If the property generates $2,400 per month in rental income, the interest-only structure delivers a small surplus each month, while the principal-and-interest loan creates a shortfall of $700.

That shortfall isn't necessarily a problem. Negative gearing allows you to claim the loss against your taxable income, which can reduce your overall tax burden. But it does mean you need to fund the difference from your own income, and that affects how many properties you can hold before cash flow becomes strained.

Variable Rate Versus Fixed Rate for Property Investors

A variable interest rate moves with the market, while a fixed rate locks in your repayments for a set term, usually one to five years. Investors often favour variable rates because they allow additional repayments and refinancing without penalty, and they typically offer features like offset accounts.

Fixed rates provide certainty. If you're holding a property with tight margins, knowing your exact repayment for the next three years makes budgeting reliable. But if rates fall, you don't benefit. And if you want to sell or refinance during the fixed term, break costs can run into thousands of dollars.

In our experience, investors building a portfolio across multiple properties tend to choose variable rates for flexibility. Those purchasing a single property as a long-term hold, particularly if they're relying on stable cash flow, often lock in a portion of the loan on a fixed rate to manage risk.

Loan to Value Ratio and Lenders Mortgage Insurance

Your loan to value ratio, or LVR, is the loan amount divided by the property value. Lenders typically require Lenders Mortgage Insurance (LMI) if your LVR exceeds 80%. LMI protects the lender, not you, and it can add thousands to your upfront costs.

For a $600,000 property in Bulleen with a 10% deposit, the loan amount would be $540,000, giving an LVR of 90%. LMI on that loan could range from $15,000 to $20,000 depending on the lender. That cost can be added to the loan amount, but it increases your total debt and reduces the equity you're starting with.

If you're purchasing your second or third investment property, you may be able to leverage equity from an existing property to reach a 20% deposit and avoid LMI. This requires a valuation of your current property and enough available equity after accounting for the lender's buffer. We regularly see investors in Templestowe and Fairfield use equity from their owner-occupied home to fund deposits on nearby investment properties without needing to save additional cash.

Calculating Investment Loan Repayments and Rental Income

Your borrowing capacity for an investment property is calculated differently than for an owner-occupied home. Lenders assess rental income at a discount, typically applying a haircut of 20% to account for vacancy, maintenance, and body corporate fees. A property generating $2,500 per month in rent is treated as $2,000 for serviceability purposes.

In a scenario like this, an investor earning $95,000 per year with no other debts applies for a loan on a $580,000 townhouse in Northcote. The property is expected to rent for $2,600 per month. The lender assesses this as $2,080 per month. After deducting the investor's living expenses and applying a buffer to the interest rate, the lender determines the maximum loan amount is $490,000. That requires a deposit of $90,000 plus stamp duty and other costs.

Stamp duty in Victoria for an investment property is calculated on the full purchase price with no concessions. For a $580,000 property, stamp duty would be approximately $31,000. These upfront costs need to be funded separately or added to the total amount you're borrowing if your LVR allows.

Maximising Tax Deductions and Claimable Expenses

Interest on an investment loan is fully tax-deductible, as are costs related to managing and maintaining the property. This includes property management fees, council rates, insurance, repairs, and depreciation on fixtures and fittings.

Structuring your loan correctly from the start protects these deductions. If you refinance and draw additional funds for personal use, the portion of interest related to that personal borrowing is no longer deductible. Keeping investment debt separate from personal debt is essential for clean record-keeping and maximising what you can claim.

Depreciation is often overlooked. A quantity surveyor can prepare a depreciation schedule that identifies claimable deductions on both the building and the assets within it. For a newer property, this can add several thousand dollars per year to your total deductions, which improves your after-tax return.

Building Wealth Through Portfolio Growth

Property investment isn't just about the rental income. Capital growth over time is where wealth accumulates. Northeast Melbourne suburbs like Doncaster, Templestowe, and Bulleen have shown consistent demand due to proximity to schools, parkland along the Yarra, and access to the Eastern Freeway. These factors support long-term value.

Once your first property has gained equity, you can use that growth to fund the deposit on a second property. This strategy, known as leveraging equity, allows you to build a portfolio without needing to save another deposit from your income. The key is ensuring each property can service its own loan while contributing to your overall financial position.

A well-structured loan health check every few years ensures your existing loans remain aligned with your goals as your portfolio grows and your circumstances change.

Whether you're purchasing your first investment property or adding to an existing portfolio, the loan structure you choose should support your cash flow, tax position, and long-term strategy. Call one of our team or book an appointment at a time that works for you to discuss which investment loan options suit your situation.

Frequently Asked Questions