When to Choose Interest-Only for Investment Loans

Investment loans carry features that differ meaningfully from owner-occupier products.

The question for nurses and midwives starting or expanding an investment portfolio is which features match your income pattern, tax position and portfolio goals. Lenders structure investment products around repayment type, tax efficiency, liquidity and flexibility. Choosing the right combination affects both cash flow and long-term holding capacity.

Interest-Only Repayments: When They Fit Your Strategy

Interest-only repayments allow you to pay only the interest charged on the loan each month, without reducing the principal balance, for a set period typically between one and five years.

Consider a registered nurse earning $95,000 who buys a rental property at current variable rates. Under principal-and-interest repayments, monthly repayments include both interest and loan reduction. Under interest-only repayments, the monthly payment covers interest only, reducing the outlay by several hundred dollars each month. The lower repayment improves cash flow, particularly where rental income does not cover all holding costs. The trade-off is that the loan balance remains unchanged during the interest-only period, and no equity is built through repayment.

Interest-only periods suit investors prioritising short-term cash flow or planning to use surplus funds for deposit on a second property. For properties acquired after 7:30pm AEST on 12 May 2026 that are not eligible new builds, losses can only be offset against other residential property income from the 2027-28 income year onward. In that environment, managing cash flow becomes more relevant than accelerating principal reduction, particularly where rental yield is modest. Once the interest-only period ends, the loan reverts to principal-and-interest repayments, and the monthly cost increases.

Interest-only is not suited to all borrowers. Lenders apply higher serviceability buffers to interest-only applications, and investment loans for nurses are assessed with the expectation that the borrower can service principal-and-interest repayments at the end of the interest-only term. Where borrowing capacity is already constrained, choosing interest-only may reduce the amount you can borrow or limit access to future lending.

Offset Accounts: Liquidity Without Losing Deductibility

An offset account is a transaction account linked to your investment loan where the balance reduces the interest charged on the loan without reducing the loan balance itself.

A midwife with a $500,000 investment loan and $30,000 sitting in an offset account pays interest only on $470,000. The loan balance remains $500,000, which means the full interest expense on that amount remains deductible. If the same $30,000 were instead used to pay down the loan, the balance would fall to $470,000, and only the interest on that reduced amount would be deductible going forward. The offset structure preserves both the deduction and the liquidity of the funds.

Offset accounts suit borrowers who accumulate savings between property purchases, hold funds for planned expenses such as renovations or body corporate levies, or want access to cash without redrawing and potentially affecting the deductibility of the loan. Offset accounts are more commonly offered on variable rate investment loans than fixed rate loans. Where an offset is available on a fixed rate product, it is typically a partial offset rather than a full 100 per cent offset.

Not all lenders offer offset accounts on investment loans, and where they do, the feature is often limited to specific loan packages that carry higher ongoing fees. When comparing investment loan options, the annual package fee should be weighed against the tax benefit of maintaining full deductibility on the loan balance.

Loan Portability and Security Substitution

Loan portability allows you to transfer an existing loan from one property to another without discharging and reapplying, while security substitution allows you to replace the property securing the loan without changing the loan contract.

Both features matter when you sell an investment property and buy another. Without portability, you discharge the existing loan on settlement of the sale, pay any break costs if the loan is fixed, and apply for a new loan to purchase the replacement property. Portability allows you to retain the existing loan structure, rate, and terms, and simply substitute the security property. This avoids reapplication, saves on discharge and establishment fees, and preserves any rate discount or feature that may no longer be available to new borrowers.

Portability is not universally offered and is subject to the lender's credit assessment at the time of the property change. If the new property is in a different state, has a different risk profile, or results in a higher LVR, the lender may decline portability or require loan restructure. Portability also does not prevent the need to pay stamp duty on the purchase of the new property or to meet settlement timing requirements.

For nurses building a portfolio across multiple properties, portability becomes more relevant once the second or third property is acquired and the likelihood of future portfolio adjustment increases. It is worth confirming at the outset whether the loan product includes portability and under what conditions it applies.

Redraw Facilities: Access With Limitations

A redraw facility allows you to withdraw extra repayments you have made above the required minimum on a principal-and-interest loan.

A nurse with an investment loan who makes additional repayments during a period of higher income can later redraw those funds if cash flow tightens or if a deposit is needed for another property. Redraw provides flexibility without requiring a separate savings account, and the additional repayments reduce the interest charged on the loan in the meantime.

Redraw does not preserve the deductibility of the loan in the same way an offset account does. If you redraw funds and use them for a private purpose, the portion of the loan corresponding to that redrawn amount is no longer deductible as an investment borrowing cost. If the redrawn funds are used to purchase another investment property or for another income-producing purpose, the interest on that portion may remain deductible, but record-keeping becomes more involved and the loan structure may need to be split to maintain clarity for tax purposes.

Redraw is typically available on variable rate loans and less commonly on fixed rate loans. Where redraw is offered on a fixed loan, lenders often impose limits on the amount that can be redrawn or charge a fee per withdrawal. Redraw is also generally at the lender's discretion, and in certain circumstances, such as financial hardship or default, access to redraw can be restricted or removed.

Fixed Versus Variable: Features and Access

Fixed rate investment loans lock in a rate for a set period, typically between one and five years, and provide repayment certainty during that time.

Variable rate loans fluctuate with changes to the lender's standard variable rate and typically offer broader access to features including offset accounts, unlimited additional repayments, and redraw without restriction. Fixed rate loans generally restrict or remove access to offset, cap additional repayments, and charge break costs if the loan is repaid or refinanced before the fixed term ends.

For nurses with variable shift patterns or those working as nurse practitioners or clinical nurse specialists with fluctuating income, a variable loan with full offset and redraw provides the flexibility to manage surplus income without penalty. For those prioritising certainty or holding properties with tight cash flow where rate movement could affect serviceability, a fixed rate with interest-only repayments may be more suitable, despite the reduced feature set.

Split loans allow you to fix a portion of the loan and leave the remainder variable, which provides partial rate certainty while retaining access to features on the variable portion. Splitting adds complexity to the loan structure and may increase the number of accounts and ongoing fees, but it is a common approach for investors seeking a middle path.

Loan Structure and Multiple Properties

Once you move beyond a single investment property, loan structure becomes as relevant as loan features.

Each investment property should typically be secured by a separate loan facility, even where all loans are held with the same lender. This allows you to sell one property without affecting the loan structure on the others, preserves clear deductibility on each loan, and simplifies tax reporting. Cross-collateralisation, where multiple properties secure a single loan or multiple loans, reduces flexibility and can restrict your ability to refinance or sell individual properties without lender consent.

Where you are expanding your property portfolio, the structure should be established correctly from the outset. Unpicking cross-collateralised loans retrospectively requires refinancing, which may involve break costs, reapplication, and revaluation of all properties in the security pool.

Nurses accessing equity release from an existing property to fund the deposit on an investment property should ensure the equity loan is structured as a separate split and used solely for the investment deposit. This keeps the interest on that split deductible. Mixing purposes within a single loan or failing to separate investment and private use complicates deductibility and increases the risk of ATO review.

Choosing Features That Match Your Income and Goals

Your choice of investment loan features should be led by income stability, portfolio intent, and cash flow.

A nurse in their first year of registration with limited savings and variable rostering will benefit from a variable loan with full offset and no ongoing fees, even if the base rate is slightly higher. A midwife with ten years' experience, stable full-time income, and plans to acquire multiple properties over the next five years will benefit from portability, split loan capability, and access to interest-only terms that free up cash flow for the next deposit.

Where you are comparing loan products, the annual cost of features should be weighed against the benefit. A loan package with offset, redraw, and portability that charges a $395 annual fee saves money if the offset balance is sufficient to reduce interest by more than that amount each year. If the offset sits empty and portability is never used, the fee is wasted.

Lenders assess investment loan applications using a minimum rental income assumption and apply a serviceability buffer that is currently 3.0 percentage points above the loan product rate. Choosing features that reduce the assessed repayment, such as interest-only, does not reduce the serviceability test. Lenders assess your ability to service principal-and-interest repayments at the higher buffer rate regardless of the repayment type you choose. Understanding this avoids surprises at the application stage and ensures the features you select are genuinely available given your borrowing capacity.

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