Everything You Need to Know About Investment Loan Structures

What Investment Loan Structure Means for Your Tax Position

The structure of your investment loan determines which expenses you can claim and how much flexibility you retain for future purchases. A loan structured with the deposit and settlement costs separated into different splits, for instance, preserves your ability to claim interest deductions only on the true investment portion while keeping costs associated with non-deductible expenses quarantined.

Consider a Melbourne buyer purchasing a rental property who combines funds from savings, offset account balances, and equity from their home. If all those funds flow into a single loan account, the interest deduction becomes murky. The ATO expects clean separation between deductible debt (used to purchase the investment) and non-deductible debt (drawn from an owner-occupied loan or used for private purposes). Mixing the two can result in lost deductions or complications during audit.

Separating the loan into multiple splits at the time of settlement keeps each purpose defined. One split covers the property purchase. Another might cover stamp duty if that amount was borrowed separately. If funds from an owner-occupied property were used for the deposit, those don't form part of the investment property loan and should remain on the original facility. Accuracy at the start avoids costly reconstruction later.

Interest Only Versus Principal and Interest Repayments

Interest only repayments reduce your monthly outgoings and maximise your cash flow, which is particularly relevant if you're holding properties in areas with lower rental yields or planning to acquire additional assets in the near term. Principal and interest repayments reduce the debt over time but also reduce the amount of interest you can claim as a deduction each year.

Most lenders offer interest only periods of up to five years on investment loans, with some extending to ten years depending on your loan to value ratio and income profile. Once the interest only period ends, the loan reverts to principal and interest unless you apply to extend it. That reversion increases repayments significantly, so it's worth planning the transition well before it occurs.

If your goal is to build a portfolio rather than pay down individual properties, keeping repayments lower in the short term frees up serviceability for additional borrowing. If you're closer to retirement or focused on reducing overall debt, switching to principal and interest earlier can accelerate equity growth and reduce your exposure to rate movements.

Fixed Versus Variable Rate Structures for Investors

Variable rates allow you to make unlimited additional repayments, redraw previously paid amounts, and access offset accounts that reduce interest without locking funds away. Fixed rates provide certainty over repayments for a set period but typically restrict extra repayments and don't allow offset functionality.

Many investors split their loan into both fixed and variable portions. A portion fixed at a lower rate provides some repayment stability, while the variable portion retains flexibility for lump sum payments or access to surplus funds via offset. That combination works well if you're managing fluctuating rental income or holding reserves for maintenance and vacancy periods.

The trade-off is complexity. Each split is a separate loan account with its own interest calculation, and refinancing a fixed portion before the term ends usually incurs break costs. If you're considering a loan refinance in the next few years, locking in a long fixed term may limit your options without penalty.

Structuring Loans Across Multiple Properties

Each property in your portfolio should have its own loan facility, even if held with the same lender. Keeping loans separate ensures that if you sell one property, the debt attached to it is cleared without affecting the structure or deductions on the others.

In a scenario where you own two rental properties in Camberwell and Richmond, financed under a single loan account, selling the Camberwell property creates a problem. The remaining debt is now partially attributable to a property you no longer own, and the ATO will disallow interest deductions on that portion. Restructuring after the fact is difficult and may not be possible depending on your equity position and lender policies.

Separate loans also make it easier to refinance individual properties as opportunities arise. If a lender offers a lower rate or preferable terms on one property, you can move that loan without disturbing the others. That's particularly useful if you're expanding your property portfolio and want to maintain relationships with multiple lenders to preserve future capacity.

Using Equity Without Contaminating Your Structure

When you draw equity from an existing investment property to fund the deposit on another, that drawdown must be structured as a separate loan split linked to the new purchase. If the equity is drawn into the original loan account and then transferred to your transaction account before being used, the ATO may treat it as a private-purpose withdrawal, making the interest non-deductible.

The correct approach is to arrange the equity release as a new split at the time the funds are required, with the loan amount directed straight to settlement for the new property. The interest on that split is then deductible because the borrowed funds were used to acquire an income-producing asset. If the same funds were withdrawn and used for private expenses, even temporarily, the deduction is lost.

This is one area where working with a broker familiar with equity release structures makes a material difference. Lenders vary in how they document and process equity drawdowns, and not all will set up the split correctly without specific instruction.

Line of Credit Facilities and Their Limitations

A line of credit operates like a large redraw facility where you can withdraw and repay funds as needed, up to an approved limit. Some investors use them to hold accessible equity for future deposits or to cover short-term holding costs across multiple properties.

The risk is that any amount drawn for non-investment purposes contaminates the entire facility. If you withdraw funds to renovate your own home or cover personal expenses, the interest on the full line of credit balance becomes partially non-deductible, and calculating the split is difficult. The ATO has disallowed deductions in cases where taxpayers couldn't prove exactly how each dollar was spent.

Line of credit facilities work best when used exclusively for investment purposes and when every drawdown is documented with a clear link to an income-producing use. Even then, they add complexity that separate loan splits avoid. Unless you have a specific need for the revolving functionality, a standard loan structure with defined splits is more secure.

Trust Structures and Loan Serviceability

Borrowing in a trust structure rather than personal names can provide asset protection and flexibility around income distribution, but it also affects how lenders assess your application. Most lenders treat trust borrowing as a higher risk, meaning you may face slightly higher interest rates, lower loan to value ratio limits, or additional documentation requirements.

The trust itself doesn't have an income, so lenders assess the income of the guarantors (usually the individual trustees or beneficiaries). If the trust distributes income to beneficiaries in lower tax brackets, the individuals guaranteeing the loan may not have sufficient declared income to service additional borrowing, even if the trust has strong cash flow.

Trust structures also complicate refinancing. Not all lenders accept trust borrowers, so your options narrow if you need to move the loan in future. If you're setting up a trust primarily for tax or estate planning reasons, the benefits may outweigh the lending constraints, but it's not a decision to make based solely on investment loan features.

How Loan Structure Affects Future Borrowing Capacity

Every loan on your name reduces the amount you can borrow next time, and the structure determines how much impact each property has. A loan on principal and interest repayments with a low balance will restrict your serviceability less than a larger interest only loan, even if both properties generate the same rental income.

Lenders calculate serviceability by taking your total income, deducting your living expenses and all loan commitments, and applying a buffer to interest rates to test whether you could still afford repayments if rates rose. If your existing loans are structured to minimise repayments (interest only, offset balances reducing interest charged), your servicing position looks stronger, and you can borrow more on the next purchase.

That's particularly relevant for Melbourne investors looking to acquire multiple properties over a short period. Structuring each loan to preserve capacity rather than accelerate repayment allows you to grow the portfolio faster, with the option to switch strategies and reduce debt later once acquisition has slowed.

Call one of our team or book an appointment at a time that works for you to review how your current loan structure supports your investment plans and whether adjustments would improve your tax position or borrowing capacity.

Frequently Asked Questions