The way you structure your investment loan determines how much flexibility you have to respond to policy changes, portfolio growth, and shifting income.
For self-employed professionals and service-based business owners, structuring an investment property loan involves more than comparing rates. Your income fluctuates, your business may hold equity you can leverage, and the recent changes to capital gains tax and negative gearing mean decisions made now will affect your tax position for decades. The loan structure you choose should support portfolio expansion, preserve deductibility, and allow you to adapt as your circumstances change.
Should You Fix or Leave Your Rate Variable?
Variable rates give you flexibility to make extra repayments, redraw funds, and refinance without penalty. Fixed rates lock in certainty but restrict your ability to adapt.
Consider a professional services consultant who purchases a residential investment property in May 2027 with a variable rate loan. Rental income covers most of the holding costs, but not all. Under the new negative gearing rules, losses from this property can only be offset against future residential property income or capital gains, not against their consulting income. Because they cannot immediately claim the full loss against their salary, they prioritise a variable rate loan that allows them to pay down the loan faster in profitable years and redraw if needed during lean periods.
If your income is irregular and you value the ability to adjust repayments or access funds, a variable rate usually offers more control. If you want payment certainty and plan to hold the property long-term without accessing equity in the near future, a partial fix may suit. Splitting your loan between fixed and variable gives you some stability while preserving flexibility on the variable portion.
Interest-Only or Principal and Interest Repayments?
Interest-only repayments keep your monthly outgoings lower and maximise the tax deduction on investment debt, but you are not reducing the loan balance.
For investors purchasing after Budget night 2026, the ability to claim losses against wage income no longer applies from July 2027. If your property runs at a loss and you cannot offset that loss against other income, the tax benefit of interest-only becomes less significant. However, interest-only can still be useful if you are building a portfolio and want to preserve cash flow to fund the next purchase, or if you plan to use surplus income to pay down non-deductible debt such as your home loan instead.
A medical professional earning $250,000 annually buys an established investment unit. They choose a five-year interest-only period on their investment loan and redirect the repayment savings toward their owner-occupied mortgage. The interest on the investment loan remains fully deductible, and by paying down their home loan faster, they reduce non-deductible debt and create a buffer for future borrowing. When the interest-only period ends, they refinance and extend it if the strategy still suits their position.
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Loan to Value Ratio and Lenders Mortgage Insurance
Your loan to value ratio determines whether you pay Lenders Mortgage Insurance and how much equity you retain for future purchases.
If you borrow above 80% of the property value, most lenders will charge LMI. This cost can be capitalised into the loan, but it is not a claimable expense for tax purposes and adds to your total debt. Borrowing at 80% or below avoids LMI and leaves equity available to access later. For investors planning to build a portfolio, keeping LMI costs low on the first purchase preserves borrowing capacity for the second.
Self-employed borrowers often have access to larger deposits due to business equity or retained earnings, but not always in liquid form. If your deposit sits at 15% and you need another 5% to avoid LMI, leveraging equity from another property or using a guarantor structure may reduce upfront costs. Alternatively, paying LMI and retaining cash flow for other investments or business expenses may be the more strategic choice depending on your plans.
How the CGT Changes Affect Loan Structure
From 1 July 2027, capital gains on established residential properties purchased after 12 May 2026 will be taxed at a minimum of 30%, and the 50% CGT discount will be replaced with inflation-based indexation.
If you buy a new build rather than an established property, you can choose between the old 50% discount or the new indexed approach, whichever is more favourable. This makes new builds particularly attractive for investors with a long-term hold strategy. Your loan structure should reflect this. New builds often require a construction loan or progress payment structure, and you will need to account for the period before settlement when you are paying interest but not yet receiving rental income.
If you purchased an established property before Budget night, the 50% CGT discount applies to the full gain, and your loan structure is not directly affected by the policy change. However, if you are planning to expand your portfolio, structuring new loans to quarantine deductions and capital gains within the residential property class becomes important. Speak to your accountant before committing to a structure, particularly if you also hold commercial property or other asset classes where negative gearing rules remain unchanged.
Offset Accounts and Redraw on Investment Loans
An offset account reduces the interest you pay without affecting the deductibility of your loan, while redraw allows you to access extra repayments you have made.
For investment loans, offset accounts are typically better than redraw because they preserve the deductible portion of your loan. If you make extra repayments and later redraw them for private use, the ATO may treat part of your interest as non-deductible. An offset keeps your funds separate and allows you to reduce interest costs without blurring the line between investment and personal expenses.
Not all lenders offer offset accounts on investment loan products, and those that do may charge a higher interest rate or annual fee. If you do not plan to park significant cash in the account, paying a lower rate without an offset may be more cost-effective. If your business generates lumpy income or you hold cash reserves between projects, an offset can reduce holding costs substantially without requiring you to lock funds into the loan.
Structuring Loans Across Multiple Properties
Each property should have its own loan facility to maintain clear separation for tax purposes and flexibility when refinancing or selling.
If you combine multiple properties under a single loan, you lose the ability to sell one property and discharge only that portion of the debt. You also complicate your tax position if one property is negatively geared and another is positively geared, or if you later convert one to an owner-occupied property. Keeping loans separate ensures that each property's income, expenses, and capital position remain quarantined.
When building a portfolio, your borrowing capacity will be assessed on the rental income from existing properties, your personal income, and your total debt position. Lenders typically apply a vacancy rate and discount rental income by 20% when calculating serviceability. If your goal is to acquire multiple properties over time, maintaining clean loan structures and preserving equity in each property will make future applications smoother. A loan health check before applying for your next investment loan can identify whether restructuring or refinancing would improve your position.
Accessing Equity for Your Next Purchase
Equity in your investment property or your home can be used as a deposit for the next purchase, but the way you structure the drawdown affects deductibility.
If you refinance your investment loan to access equity for another investment property, the interest on the additional borrowing remains deductible because the funds are used for investment purposes. If you access equity from your home loan to fund an investment deposit, that portion of your home loan becomes deductible and should be split into a separate account to preserve the tax benefit.
Do not mix purposes within a single loan facility. If you draw $100,000 from your home loan to fund an investment deposit, create a sub-account or split loan for that amount so the interest is clearly attributable to the investment. If the funds are used for both investment and private purposes, the ATO will disallow the portion that cannot be clearly linked to income-producing activity. Your broker can help structure the refinance to keep everything separated and defensible.
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