Investment Loan Features and What Not to Ignore

The Features That Actually Matter When Borrowing to Invest

Investment property finance is built differently to an owner-occupied home loan. The loan features you choose directly affect cash flow, tax treatment and the flexibility you have when market conditions shift. Not every feature adds value, and some come with trade-offs that only show up later. The key is matching features to your investment approach, not just taking what looks standard.

Consider an investor who borrows to purchase a rental property using an interest-only loan with an offset account attached. Rental income sits in the offset, reducing daily interest charges, but the borrowing remains fully deductible because the loan balance itself does not reduce. That distinction matters for tax purposes. If the same investor had made principal repayments using rental income, the deductible loan balance would fall, reducing the value of the tax deduction over time. The offset preserves deductibility while still reducing the effective rate paid.

Rate structure, repayment type and account features all interact with how the Australian Taxation Office treats borrowing costs. Understanding that interaction means understanding which features support your strategy and which ones dilute it.

Interest-Only Repayments and How They Affect Cash Flow

Interest-only repayments let you defer principal reduction for a set period, usually up to five years. During that period, your required repayment is lower, which improves cash flow if rental income does not fully cover the loan cost. This structure is common among investors who want to maximise tax-deductible debt or who plan to use surplus income to service other borrowings or build another deposit.

Interest on borrowings used to acquire or hold a rental property is deductible against assessable income, provided the property is rented or genuinely available for rent. Principal repayments are not deductible. For an investor holding multiple properties or building a portfolio, keeping the deductible loan balance higher for longer can reduce taxable income each year. That is particularly relevant where the investor's marginal tax rate is high.

Once the interest-only period ends, the loan reverts to principal and interest unless you negotiate an extension. Not all lenders offer extensions automatically, and approval depends on serviceability at the time of request. If you are relying on an interest-only structure beyond the initial term, confirm upfront whether the lender supports renewal and under what conditions.

Fixed or Variable Rate, and Why the Choice Depends on Your Leverage

Fixed rates lock in your interest cost for a set period, usually between one and five years. Variable rates move with the lender's pricing decisions, which generally track the Reserve Bank of Australia cash rate and wholesale funding costs. Neither option is inherently superior. The decision depends on how much rate movement your cash flow can absorb and whether you value certainty over flexibility.

A fixed rate removes repayment volatility during the fixed period, which can make budgeting easier if your rental income is stable and your borrowing is close to your serviceability limit. The trade-off is reduced flexibility. Most fixed rate products do not allow additional repayments beyond a small annual threshold without incurring break costs, and redraw is usually unavailable. If you plan to make lump sum repayments or access equity during the loan term, a variable rate product typically provides more options.

Some lenders offer split rate structures, where part of the loan is fixed and part remains variable. This approach balances certainty with flexibility. In our experience, investors using this structure often fix the portion of the loan that matches their expected minimum rental income and leave the remainder variable to accommodate additional repayments or offset account use.

Offset Accounts and How They Work Alongside Deductible Debt

An offset account is a transaction account linked to your investment loan. The balance in the offset is subtracted from the loan balance when calculating daily interest, but the loan balance itself remains unchanged. That distinction is important for tax purposes. Because the loan principal does not reduce, the full borrowing remains deductible, even while you are paying less interest.

Consider an investor with a variable rate loan of $500,000 and $50,000 sitting in an offset account. Interest is charged on $450,000, but the loan balance stays at $500,000. If the property is sold and the loan repaid, the investor has kept $50,000 accessible while maintaining the full deduction. If instead the $50,000 had been used to reduce the loan principal, the deductible balance would drop to $450,000, and the investor would need to re-borrow if that cash was needed later. Re-borrowing to access equity can create mixed-purpose debt, which complicates deductibility.

Not all lenders offer offset accounts on investment loans, and some charge a higher rate or annual fee for the feature. Whether the cost is justified depends on how much surplus cash you expect to hold and whether you need that cash to remain liquid. For investors who plan to use rental income to fund further deposits or offset other loans, the feature can add real value. For investors with minimal surplus cash flow, the additional cost may not be worthwhile.

Redraw Facilities and the Risk of Creating Non-Deductible Debt

A redraw facility lets you access extra repayments you have made above the minimum required. On the surface, this looks similar to an offset account, but the tax treatment is different. When you make an extra repayment, the loan balance reduces. That reduction lowers the deductible portion of the loan. If you then redraw those funds for a private purpose, such as purchasing a car or funding a holiday, the redrawn amount is no longer deductible, even though it increases the loan balance again.

The Australian Taxation Office treats the purpose of each drawdown separately. If you redraw funds to purchase another investment property, that portion remains deductible. If you redraw for private use, it does not. This creates a split-purpose loan, where part of the interest is deductible and part is not. Keeping records and separating borrowings by purpose avoids this issue, but redraw facilities make separation harder to maintain.

For investment lending, offset accounts are generally preferable to redraw if you want to preserve full deductibility while maintaining access to surplus funds. Redraw may still be appropriate if you do not plan to access the funds for private purposes or if the lender does not offer offset on the product you are using.

Loan Portability and How It Applies When You Sell and Replace

Portability allows you to transfer your existing loan to a different property without discharging and reapplying. This can save time and avoid discharge fees, but it is not always straightforward when moving from one investment property to another.

If you sell an investment property and use the loan proceeds to purchase a replacement investment property, portability can work cleanly. The borrowing remains deductible because it is still being used for investment purposes. If you sell an investment property, repay the loan, and then borrow again for a new purchase, you are effectively starting fresh. The new loan is deductible against the new property's rental income, but you lose any rate discount or product feature tied to the original loan unless the lender agrees to transfer it.

Some lenders allow portability only within certain timeframes or require a new valuation and serviceability assessment. If you are building a portfolio and expect to sell and replace properties over time, confirm upfront whether the lender supports portability and under what conditions. Not all lenders offer the feature, and those that do may impose restrictions that reduce its usefulness.

Serviceability Assessment and the 3 Percentage Point Buffer

Lenders assess your ability to service an investment loan by applying a buffer of at least 3 percentage points above the loan product rate. This buffer has been in place since October 2021 and applies to all new borrowings through authorised deposit-taking institutions. The buffer exists to ensure you can continue to meet repayments if rates rise during the loan term.

Rental income is included in the serviceability assessment, but not always at full value. Most lenders apply a shading factor, typically between 20 and 30 per cent, to account for periods of vacancy, maintenance costs and rent arrears. Some lenders use a fixed shading percentage, while others adjust based on the property type or location. A property in an area with high rental demand may receive less shading than one in a location with a history of longer vacancy periods.

From 1 February 2026, lenders are also subject to a debt-to-income limit, which restricts the proportion of new loans that can be written to borrowers with total debt of six times their income or more. The limit applies separately to investment lending and owner-occupied lending within each institution. If your total borrowings, including the new investment loan, exceed six times your gross income, you may still be approved, but the loan will count toward the lender's restricted allocation. In practice, this means some lenders may be more cautious at higher debt-to-income levels, particularly later in a quarter when they are closer to the cap.

Tax Treatment Changes From the 2027-28 Income Year

From the 2027-28 income year, established residential investment properties acquired after 7:30pm AEST on 12 May 2026 are subject to new tax treatment. Losses on those properties, including interest costs that exceed rental income, can only be offset against other residential property income. Losses cannot be deducted against salary, business income or other asset classes. Excess losses can be carried forward to offset residential property income in future years, including capital gains on residential properties.

Properties held at 7:30pm AEST on 12 May 2026, including those under contract awaiting settlement at that time, are grandfathered. Losses on those properties continue to be fully deductible against all income until the property is sold. Eligible new build properties acquired after 12 May 2026 are also exempt and retain full loss deductibility.

This change affects the cash flow benefit of holding negatively geared property, particularly for investors with high marginal tax rates who previously used property losses to reduce their overall tax liability. Investors acquiring established property after 12 May 2026 need to model cash flow on the basis that interest costs exceeding rent will not reduce tax on other income. That makes positively geared properties, or properties close to neutral gearing, relatively more attractive than they were under the previous rules.

Loan features that support cash flow, such as interest-only repayments and offset accounts, become more relevant in this environment. Investors who cannot deduct losses against salary need either sufficient rental income to cover costs or sufficient liquidity to absorb the shortfall without relying on a tax refund.

Capital Gains Tax Changes From 1 July 2027

From 1 July 2027, capital gains on residential investment properties are taxed under a new framework. The 50 per cent discount for individuals, trusts and partnerships is replaced by cost base indexation using the Consumer Price Index and a 30 per cent minimum tax rate on real gains. Investors index the cost base of their property in line with inflation and pay tax on above-inflation profits only.

For properties owned before 1 July 2027 and sold after that date, gains are split. The portion of the gain accruing before 1 July 2027 is taxed under the current rules. The portion accruing after that date is taxed under the new rules. Taxpayers can either obtain a market valuation as at 1 July 2027 or apply an apportionment formula published by the Australian Taxation Office.

Eligible new build residential properties acquired after 12 May 2026 retain access to both the existing 50 per cent discount and the new indexation and minimum tax arrangements. Investors can choose which method to apply at the time of disposal.

This change affects the after-tax return on property investment, particularly for investors who hold properties for long periods in high-inflation environments. Indexation can reduce the taxable gain where inflation is high, but the 30 per cent minimum rate may increase tax payable for investors on lower marginal rates. The interaction between loan structure and tax treatment becomes more complex, and investors should seek advice from a licensed tax specialist when structuring borrowings and planning disposal.

Call one of our team or book an appointment at a time that works for you. We work with investment loan options from lenders across Australia and can help you identify the features that align with your property investment approach and the tax treatment that applies to your situation.

Frequently Asked Questions