Investment Loan Structures: The Pros and Cons

Structure determines whether you can offset losses against your salary this year, whether you pay principal from day one, and whether you can access equity later without refinancing.

For self-employed business owners in Sydney, where income fluctuates and cash flow matters, the loan structure you choose at application shapes your entire investment strategy. A structure that suits a salaried employee rarely suits someone with variable income, multiple entities, or plans to build a portfolio over time.

Interest Only or Principal and Interest: Cash Flow Versus Equity

Interest-only repayments are lower each month because you're not repaying any of the borrowed amount during the interest-only period. Principal and interest repayments are higher but reduce the loan balance over time.

Consider a buyer who purchases a rental property using an interest-only structure for five years. Monthly repayments are lower, which improves cash flow and lets them hold the property through vacancy periods or business downturns without selling. At the end of the interest-only term, the loan reverts to principal and interest, and repayments increase. If rental income has grown by that point, the transition is manageable. If not, they may need to refinance or restructure.

Interest-only loans attract higher risk weighting under APS 112, which generally means slightly higher interest rates from most lenders. Where the interest-only period exceeds five years and the LVR is above 80 per cent, the loan is classified as non-standard, which can affect pricing and serviceability.

Principal and interest repayments build equity automatically. For investors who want to reduce debt over time or access equity for a second purchase within a few years, this structure provides a clearer path. The trade-off is reduced monthly cash flow, which can be a constraint when rental income doesn't cover the full repayment.

Variable Rate, Fixed Rate, or Split: Flexibility Versus Certainty

A variable rate moves with the lender's standard adjustments. A fixed rate locks in your repayment amount for a set period, usually between one and five years.

In our experience, self-employed borrowers often value flexibility over certainty because their income isn't constant. A variable rate investment loan allows unlimited extra repayments, full redraw access, and the ability to refinance or restructure without break costs. If your business has a strong quarter and you want to pay down the loan, you can. If cash flow tightens, you revert to the minimum repayment.

A fixed rate protects you from rate increases during the fixed period, but it removes most flexibility. Extra repayments are capped, redraw is usually unavailable, and exiting the loan early can trigger break costs calculated on the difference between your fixed rate and the lender's current wholesale funding cost. For borrowers who plan to hold the property long-term and want predictable repayments, a fixed rate can work. For those who may need to restructure, sell, or refinance within a few years, it introduces risk.

A split structure divides the loan between fixed and variable portions. You get partial rate protection and partial flexibility. The structure adds complexity because you're managing two loan accounts, each with its own rate, terms, and conditions. Where that complexity is justified, it's usually because the borrower has high income variability and wants to lock in a portion of repayments without losing access to redraw entirely.

How Loan Structure Affects Your Tax Position

Interest on an investment loan is deductible against assessable income where the property is rented or genuinely available for rent. The amount you can claim depends on how much interest you pay, not whether the loan is interest-only or principal and interest.

For properties held before 7:30pm AEST on 12 May 2026, and for eligible new builds acquired after that date, losses from the property can be offset against your salary, business income, or other assessable income. For established properties acquired after that date, losses can only be offset against income from other residential rental properties or carried forward to future years. The distinction is critical for self-employed buyers, particularly where rental losses are part of the broader tax strategy.

Loan structure also affects deductibility where funds are drawn for mixed purposes. If you refinance an investment property and draw additional funds for private use, only the portion used for investment purposes remains deductible. Keeping the investment loan separate from other borrowings preserves the deduction and makes record-keeping straightforward.

If you're planning to build a portfolio, setting up the first loan correctly avoids costly restructuring later. A loan that's fit for one property rarely scales cleanly to three or four without adjustment.

The Role of Offset Accounts and Redraw in Investment Lending

An offset account reduces the interest charged on your loan by the balance held in the offset account. A redraw facility allows you to withdraw extra repayments you've made above the minimum.

For investment loans, offset accounts do not reduce the deductible interest. The ATO treats the full loan balance as the borrowing, regardless of offset. Redraw facilities create similar issues. If you make extra repayments and later redraw those funds for private purposes, the interest on the redrawn amount is no longer deductible.

Where offset and redraw make sense is cash flow management, not tax outcomes. If you want to park surplus business income and reduce interest costs without permanently repaying the loan, an offset account does that without affecting deductibility. If you need access to those funds later for another investment, the structure remains intact.

We regularly see scenarios where borrowers redraw funds for private expenses and inadvertently reduce their deductible interest. Separating investment and private borrowings from the outset avoids that issue entirely.

Structuring Loans Across Multiple Entities

Self-employed buyers often hold property in their own name, a family trust, a company, or a combination. The structure you choose affects liability, tax treatment, land tax, and borrowing capacity.

Where a property is held in a trust, the loan is usually taken by the trustee. Lenders require personal guarantees from the individual beneficiaries, which means you're personally liable even though the property sits in the trust. Trust borrowing rates are generally the same as individual rates, but serviceability is assessed against the trust's distributable income and the guarantors' capacity.

Company structures are less common for residential investment property because the tax treatment is less favourable. Companies pay a flat tax rate and cannot access the capital gains discount. Where a company borrows, the individual directors guarantee the loan, and lenders assess serviceability against both company and personal income.

Where you already hold business assets in a trust or company, adding residential property to the same structure can create complications. Lenders treat mixed-use security differently, and cross-collateralisation between business and residential assets can limit flexibility later. In most cases, holding residential investment property in your own name or a separate trust provides the cleanest structure for both lending and tax purposes.

LVR, LMI, and Portfolio Lending Considerations

Your loan-to-value ratio determines whether you pay LMI and affects the interest rate and serviceability buffer applied by the lender. For investment loans, most lenders will lend up to 90 per cent of the property value, but anything above 80 per cent requires LMI.

LMI is a one-off premium calculated on the loan amount and LVR. It protects the lender, not the borrower, but it allows you to proceed with a smaller deposit. For investors building a portfolio, paying LMI on the first property can preserve cash for the next deposit. The premium is not deductible as a borrowing cost in the year it's paid, but it may be deductible over five years or the term of the loan, depending on the amount.

Where you already own property, equity in that property can be used as part or all of the deposit for your investment purchase. Releasing equity involves refinancing the existing loan and increasing the borrowing. The additional funds must be used for investment purposes to keep the interest deductible. Lenders assess the combined serviceability of both loans and apply the 3 per cent buffer to the total borrowing.

Debt-to-income limits introduced in February 2026 cap the portion of new lending above six times your total income at 20 per cent of each lender's investor loan book. For borrowers with high existing debt or lower declared income, this can reduce borrowing capacity even where serviceability is otherwise met. Structuring loans to maximise deductible debt and separate private borrowings improves both your tax position and your capacity for future lending.

Refinancing Investment Loans: When Structure No Longer Fits

You might refinance an investment loan to access a lower rate, release equity, switch from interest-only to principal and interest, or consolidate multiple loans. Refinancing resets the loan structure, which means it's an opportunity to correct issues that didn't matter at purchase but limit your options now.

If your existing loan has a fixed rate and you're inside the fixed period, exiting early usually triggers break costs. The cost depends on how much time remains and the difference between your rate and current wholesale rates. Where the cost is significant, waiting until the fixed period ends is usually the better outcome unless the benefit from refinancing outweighs the break cost.

Refinancing an investment loan while self-employed requires current financials, tax returns, and often a letter from your accountant. Lenders assess your income differently depending on whether you're a sole trader, in a partnership, or operating through a company or trust. Where income has dropped or become more variable, serviceability can be an issue even where the loan was comfortably serviceable at the time of purchase.

In some cases, refinancing is less about rate and more about structure. If the original loan doesn't allow offset, doesn't permit extra repayments, or is cross-collateralised with another property, refinancing can remove those restrictions and provide flexibility for the next stage of your investment strategy.

Selecting the Right Investment Loan Structure for Your Situation

No single structure suits every investor. The right structure depends on your income pattern, your tax position, whether this is your first or fourth investment property, and how long you intend to hold the asset.

For most self-employed buyers, a variable rate interest-only loan with offset provides the best combination of tax efficiency, cash flow management, and flexibility. It allows you to manage repayments around your business cycle, maintain full deductibility, and refinance or sell without penalty when circumstances change.

Where income is stable and long-term ownership is certain, a principal and interest loan builds equity and reduces risk over time. Where rate protection is a priority, a partial fix may be justified, but only where the loss of flexibility is understood and acceptable.

Structure isn't something to revisit every year, but it's also not something to set and forget. Your first investment loan should be structured with the second and third in mind, particularly where those purchases rely on equity or serviceability from the first.

Call one of our team or book an appointment at a time that works for you. We'll work through your income structure, your plans for the property, and the lending options available across the panel to match the loan structure to your situation, not the other way around.

Frequently Asked Questions