Avoid These 5 Mistakes When Choosing an Investment Loan

An investment loan structures your borrowing so you can build wealth through property while managing tax, cash flow and flexibility.

Carnegie has drawn interest from buyers looking to enter the property investment market, particularly those drawn to its proximity to Caulfield Station and Koornang Road shopping precinct. The combination of older-style units and newer townhouse developments means investors face varied rental yields and capital growth prospects depending on which end of the market they target.

Choosing the wrong loan structure at the outset can cost tens of thousands in unnecessary interest, limit your ability to add properties later, or leave you exposed when markets shift. Most of the damage is done before settlement, when investors assume one lender is much like another or accept the first approval without questioning the features.

Mistake 1: Accepting the First Rate Without Comparing Loan Features

Interest rate matters, but locking in a low rate on a loan with restrictive terms will cost you more over time. A loan with a slightly higher rate but full offset, no extra repayment limits, and portability can save thousands compared to a discounted product that charges break fees or restricts access to equity.

Consider a buyer refinancing an owner-occupied property in Carnegie to release equity for a deposit on a second property. If the new loan doesn't allow further redraw or splits, they'll need to refinance again within 12 months to access equity for a third purchase. That means another round of application fees, valuation costs, and potential rate increases if their circumstances have changed.

When comparing investment loan options, focus on offset availability, the ability to split portions between variable and fixed rates, and whether the lender allows you to capitalise costs like Lenders Mortgage Insurance into the loan amount without affecting serviceability. These features directly impact how quickly you can move on the next investment and how much control you retain over surplus cash.

Mistake 2: Choosing Interest-Only Without a Clear Exit Plan

Interest-only repayments reduce monthly costs and can improve short-term cash flow, but the loan doesn't reduce during the interest-only period. At the end of that period, the loan reverts to principal and interest, and monthly repayments jump sharply because the remaining principal must now be repaid over a shorter timeframe.

Lenders typically allow interest-only periods of up to five years on investment loans. If the loan amount is high relative to the property value and the rental income doesn't cover the new repayment, you're forced to either refinance, sell, or subsidise the shortfall from other income. In the current environment, with debt-to-income lending limits applying from February this year, refinancing a high-balance loan on a single income has become more difficult.

Interest-only works when you have a defined plan to either sell the property, refinance using equity growth, or absorb the repayment increase from other income. Without that plan, you're deferring a problem rather than solving one.

Mistake 3: Borrowing Against Your Home Without Separating the Debt

Using equity in your owner-occupied property to fund an investment deposit is common, but many borrowers increase their existing home loan rather than establishing a separate split or standalone facility. That mixing makes it impossible to claim the interest on the investment portion because the ATO requires a clear link between the borrowed funds and the income-producing asset.

From the 2027-28 income year, investors who purchase established residential property will only be able to offset losses against other residential property income under the new negative gearing rules. Properties held before May last year, including those under contract at that time, remain fully deductible. The change makes clean loan structures even more important, particularly if you're planning to hold multiple properties with different acquisition dates and different tax treatment.

When you release equity, ask your broker to establish the investment loan as a separate split with its own account and its own loan agreement. That separation protects your ability to claim interest deductions and makes record-keeping straightforward if you're ever audited.

Mistake 4: Ignoring Lenders Mortgage Insurance When It Could Save Time

Lenders Mortgage Insurance is often positioned as a cost to avoid, and in many cases waiting until you have a 20 per cent deposit does make sense. But if property values are rising or you're competing in a market where stock is limited, paying LMI to secure a property now can be better than waiting 12 months to save the premium.

LMI premiums are calculated on a sliding scale based on loan amount and loan-to-value ratio. Borrowing at 90 per cent LVR will incur a higher premium than borrowing at 85 per cent, and the premium can be capitalised into the loan amount rather than paid upfront. Stamp duty on the premium applies in some states, though not in Victoria.

The decision comes down to opportunity cost. If waiting six months means missing a property that suits your investment strategy, and if the rental income and potential capital growth justify the premium, LMI becomes a timing tool rather than a penalty. We regularly see this calculation come up for investors in Carnegie looking to secure a unit close to the train line before another rate cut brings more buyers into the market.

Mistake 5: Choosing a Lender Based Only on Serviceability Without Considering Portfolio Limits

Some lenders will approve your first investment loan with minimal fuss, but they apply strict limits on how many investment properties they'll finance for a single borrower. If you plan to build a portfolio rather than hold a single property, you need a lender whose policy supports multiple securities.

Lender policies vary widely. Some will finance up to ten properties for individual investors, others cap exposure at four, and some apply additional servicing buffers or require higher deposits once you hold more than two investment loans. If you choose a lender for your first purchase based purely on rate or approval speed, you may find yourself forced to refinance that loan within two years just to access a second property with a different lender.

When assessing borrowing capacity for your first investment loan, ask what happens at property two, three, and four. A broker who works across multiple lenders can structure your loans so each property is financed with an institution that supports the next step, rather than one that blocks it.

Getting your investment loan structure right means thinking past settlement and considering how the loan behaves over five to ten years. Call us or book an appointment at a time that works for you.

Important: This does not constitute tax advice and it is recommended to seek advice from your Accountant or Financial Planner for your individual circumstances.