Top Strategies to Optimise Your Investment Loan

An optimised investment loan reduces your holding costs without compromising access to capital when you need it.

Most property investors set up their loan once and leave it untouched for years, even as their financial position, portfolio strategy and the tax environment shift. The result is often higher interest payments than necessary, limited access to equity when opportunity appears, and tax deductions left on the table. Optimisation is not about chasing the lowest advertised rate. It involves aligning your loan structure, repayment type, and borrowing strategy with the way you actually hold and grow property, particularly as legislative changes reshape the investor landscape in Victoria and across Australia.

Split Loans to Quarantine Tax Deductibility

Interest is only deductible when the borrowed amount is used to produce assessable income. If you redraw or offset funds from an investment loan for private purposes, you dilute the deductibility of that portion.

Consider an investor who refinanced an existing investment property to release equity for a family holiday. The entire loan sits in a single account. When the ATO reviews the claim, only the portion of interest attributable to the investment property remains deductible. The portion relating to the personal drawdown is not. That distinction is permanent and follows the loan until discharge. A split loan structure separates the original investment borrowing from any equity release or future drawdown. Each split maintains its own purpose and deductibility profile. This structure becomes particularly relevant for investors planning to use equity to expand a portfolio or fund renovations that are partly private in nature.

Interest-Only Repayments to Preserve Cash Flow

Interest-only repayments reduce your monthly commitment, freeing up cash to cover holding costs, fund additional purchases, or buffer against vacancy.

Property investors using interest-only loans typically hold more working capital than those repaying principal and interest from day one. Under current lending standards, most lenders will approve interest-only terms for up to five years on residential investment loans, after which the loan converts to principal and interest unless renewed. The application of APRA's Prudential Standard APS 112 means lenders apply a higher risk weight to interest-only loans, particularly where the LVR exceeds 80 per cent. That translates to stricter serviceability assessment, but it does not prevent access if your income and existing commitments support the loan amount.

An investor holding two properties in regional Victoria switched both loans from principal and interest to interest-only during a refinance. The monthly saving was around $1,200 across both properties. That capital remained in an offset account linked to the investor's owner-occupied home loan, where it reduced non-deductible interest instead. At the end of the five-year interest-only period, the investor renewed the terms on one property and allowed the other to revert, depending on rental performance and portfolio strategy at that time.

Variable Rates for Offset Access and Flexibility

Variable rate investment loans allow full offset functionality, which fixed rate products generally do not.

An offset account linked to your investment loan reduces the interest calculated each day without reducing the loan balance itself. The loan amount remains unchanged for tax purposes, so your deduction is preserved while your actual interest cost falls. That distinction matters. In a scenario where an investor holds a variable rate loan of $500,000 and parks $80,000 in the linked offset account, interest is charged on $420,000 but the deduction still applies to the full $500,000 of borrowing used to acquire the property. The $80,000 can be withdrawn at any time without reapplication or impacting the deductible loan purpose.

Fixed rate products typically offer either no offset or a capped offset that limits the benefit. If rate certainty is a priority, a split between fixed and variable allows you to lock a portion of the debt while retaining offset access on the remainder. Many Victorian investors using this approach fix between 30 and 50 per cent of the loan, leaving the balance on variable terms with a full offset.

Refinancing to Access Portfolio Rate Discounts

Lenders apply deeper rate discounts and higher LVR limits to borrowers with multiple properties financed under the same portfolio.

A single investment property financed in isolation often attracts a standard investor rate. When you consolidate two or more properties with the one lender, portfolio pricing becomes available. The discount varies by lender and total exposure, but differences of 20 to 40 basis points are common, particularly where the combined loan amount exceeds $1 million. Some lenders will also increase the maximum LVR for subsequent purchases or waive LMI on certain property types when lending is retained in-house.

Investment loan refinancing is often the point at which this discount is negotiated. If your properties are currently spread across three lenders, a refinance that brings them under one institution may unlock both a lower rate and higher borrowing capacity for the next acquisition. The trade-off is concentration risk. Holding all debt with a single lender reduces your negotiating position if serviceability policy tightens or if you need to restructure during financial hardship.

Paying Down Non-Deductible Debt First

Interest on your owner-occupied home loan is not tax deductible. Interest on a loan used to purchase or hold a rental property is.

Where surplus cash flow exists, it should typically be directed toward the debt that provides no deduction. That often means prioritising repayments or offset contributions against your home loan while keeping your investment loan at the minimum repayment level, particularly if the investment loan is structured as interest-only. The result is a faster reduction in total interest cost across your position. Over a ten-year period, the difference in total interest paid can run into tens of thousands of dollars, depending on loan size and rate.

This approach underpins the debt recycling strategy, where investors progressively replace non-deductible debt with deductible debt by redrawing against the paid-down home loan to fund further investment activity. The strategy requires careful documentation and is best implemented with split loan structures that maintain a clear audit trail for each borrowing purpose.

Structuring for the 1 July 2027 Negative Gearing Changes

From 1 July 2027, rental losses on residential properties acquired on or after 7:30pm AEST on 12 May 2026 can no longer be offset against salary or other non-rental income.

Losses will be quarantined and carried forward to offset future rental income or capital gains from residential property. Properties purchased before that date retain full negative gearing under the existing rules until sold. The change does not prevent you from borrowing or claiming interest deductions. It changes where those deductions can be used. For investors in Victoria acquiring established dwellings after May 2026, the strategy shifts toward neutral or positively geared properties, shorter holding periods before sale, or a focus on new builds, which remain exempt from the quarantine.

Loan optimisation in this environment means matching your interest rate and loan features to the cash flow profile you can sustain without relying on a tax refund each year. Interest-only terms still reduce repayments, but you lose the income-smoothing effect of a mid-year negative gearing offset. Investors structuring purchases between now and mid-2027 should model both the immediate cash flow and the post-2027 position before locking in loan terms or committing to a particular property type.

Reviewing Your Loan Within 18 Months of Settlement

Most lenders offer sharper pricing to retain existing customers than they do to attract new ones, but only if you ask.

Rate discounts, offset access, and fee waivers are regularly negotiated within the first two years of a loan. After 18 months, you have a repayment history, and if the property has increased in value or your income has improved, your serviceability profile is stronger than at settlement. That is often the right time for a loan health check. A broker-led review compares your current terms against what is available in the market and what your existing lender will offer to retain the business. If the gap is significant, refinancing may be justified. If the improvement is marginal, a phone call to your lender's retention team often delivers the same outcome without the cost or time involved in a full refinance.

Victorian investors who purchased in growth corridors during the past two years and have seen value increase by 10 per cent or more are particularly well placed to renegotiate. The LVR has improved without any capital input, and that additional equity may support a rate reduction or removal of LMI on a future purchase.

Call one of our team or book an appointment at a time that works for you. We will review your current structure, model the cash flow impact of moving to interest-only or splitting your loan, and confirm whether refinancing or a retention offer makes sense for your portfolio and timeline.

Frequently Asked Questions