Simple hacks to maximise tax deductions on investment loans

Interest on borrowings is deductible when the property produces rental income

Interest on an investment loan is deductible to the extent the property is rented or genuinely held to produce assessable income. The borrowed funds must be used to acquire or hold the rental property itself. If you use a loan secured against an investment property to pay for personal expenses, renovations to your home, or a holiday, that interest is not deductible regardless of the security.

Consider a buyer in Clyde North who refinances an investment property and draws out $40,000 in equity. If $30,000 goes toward a deposit on a second rental property and $10,000 goes toward a family car, only the interest attributable to the $30,000 is deductible. Lenders do not split the loan automatically. You need to structure it with separate splits or separate loan accounts at the time of settlement so the deductible portion is isolated. Mixing funds in a single redraw or offset account tied to both purposes can contaminate the entire interest claim.

The Australian Taxation Office will ask for loan documentation, settlement statements, and evidence of how funds were applied if your return is reviewed. Keeping the paper trail intact from day one is not optional.

Negative gearing rules change from 1 July 2027 for new purchases

Under legislation that received Royal Assent in late June, investment loans taken out to purchase established residential dwellings from 12 May 2026 onward will be subject to quarantined negative gearing from 1 July 2027. Rental losses on those properties cannot be offset against salary, wages, or business income. Losses can only be offset against other residential rental income, carried forward to future rental income, or applied against future capital gains on residential property.

Properties purchased before 12 May 2026 retain full negative gearing under existing rules until sold. Properties bought between 12 May 2026 and 30 June 2027 can be negatively geared under existing rules until 30 June 2027, after which the quarantine applies.

For Clyde and Clyde North investors, this distinction matters when deciding between an established dwelling in an area with strong rental demand and a new build. An established three-bedroom house near Eden Rise Village or Selandra Rise that settles after the cutoff will have losses quarantined. A new townhouse in a subdivision releasing this year, provided it meets the definition of an eligible new build, retains full negative gearing indefinitely.

Eligible new builds retain full deductibility and CGT discount

An eligible new residential dwelling under the current legislation is one constructed on previously vacant land, or a dwelling that replaces an existing structure where the total number of dwellings increases. A knock-down rebuild that results in the same number of dwellings does not qualify. A substantial renovation, even if it involves a new roof and internal reconfiguration, does not qualify.

If a new build is occupied for more than 12 months before being sold to a subsequent investor, that subsequent purchaser loses access to full negative gearing. The property is treated as established from that point forward.

New builds also retain the option to use the 50 per cent capital gains tax discount when the property is eventually sold, rather than being subject to the indexed cost base and 30 per cent minimum tax rate that applies to established dwellings purchased after the cutoff. For an investor in Clyde North planning to hold for ten to fifteen years, the CGT treatment can be as important as the annual deduction.

In our experience, buyers drawn to the affordability of established stock sometimes underestimate the tax cost over the hold period once these changes take full effect.

Loan to value ratio and Lenders Mortgage Insurance reduce available deductions

Borrowing at a loan to value ratio above 80 per cent on an investment property typically attracts Lenders Mortgage Insurance. LMI premiums are capitalised into the loan amount, which increases the total debt and therefore the interest paid each year. That interest is deductible. The LMI premium itself is also deductible, but it must be claimed over five years or over the life of the loan, not as a lump sum in the year of purchase.

An investor purchasing a property in Clyde at an LVR of 90 per cent might pay $15,000 in LMI. If the loan amount is $450,000 including the premium, annual interest at a rate around current variable levels would be roughly $27,000. The LMI can be claimed at $3,000 per year if spread over five years. After rental income and other deductions, the property may show a loss of $8,000 in the first year. Under existing rules that loss offsets other income. Under the post-July 2027 rules for new purchases of established dwellings, it does not.

Reducing LMI by contributing a larger deposit or using equity from another property lowers the total interest bill, but it also reduces the size of the deduction. The question is whether the saved interest exceeds the lost tax benefit, and that depends on your marginal tax rate and your cash flow position. A borrowing capacity review before committing to a deposit size can clarify the trade-off.

Ongoing holding costs are deductible in the year they are incurred

Body corporate fees, council rates, landlord insurance, property management fees, water charges, and repairs are deductible in the financial year you pay them, provided the property is genuinely available for rent. If the property is vacant but advertised at a realistic rent, deductions continue. If you withdraw it from the rental market to use privately or leave it deliberately vacant without advertising, deductions stop for that period.

Depreciation on fixtures, fittings, and building structure is claimed based on a quantity surveyor's report. For properties purchased after the changes to depreciation rules in previous years, plant and equipment in established dwellings purchased from another investor cannot be claimed. New builds and owner-built properties retain full access to both divisions of the depreciation schedule.

Interest charged on a loan used to fund repairs or capital works is also deductible, but the loan purpose must be documented. If you use a line of credit secured against the investment property to replace a hot water system, the interest on that drawdown is deductible. If you use the same facility to pay school fees, it is not.

Vacancy impacts cash flow but does not remove the deduction

Clyde North has seen vacancy rates fluctuate with the pace of new subdivision releases and the volume of investor stock entering the rental market in the same quarter. A property vacant for six weeks between tenants still qualifies for full deductions during that period if it is listed with an agent at a rent consistent with recent comparable leases.

The Australian Taxation Office distinguishes between temporary vacancy and deliberate non-use. A property listed for three months at double the market rent is not genuinely available. A property vacant for eight weeks while minor repairs are completed and a new tenant is secured is.

Some investors hold an offset account rather than paying down the loan, keeping the full loan balance intact and the interest deduction at its maximum. Rental income and salary can sit in the offset, reducing interest paid without reducing the deductible loan balance. Redraw facilities work differently. Paying extra into the loan and later redrawing for private purposes can taint the deduction unless the loan is split at the outset into fixed purposes.

Refinancing must preserve the original purpose of the borrowed funds

When you refinance an investment loan, the amount used to repay the old loan retains its deductible character. Any additional funds drawn at the time of refinance are deductible only if used for income-producing purposes. Refinancing to access equity and fund a private expense converts that portion into non-deductible debt.

If you refinance to secure a lower variable interest rate or access better loan features, the structure of deductibility does not change. If you consolidate multiple debts, some investment-related and some private, into a single facility without proper allocation, the entire interest deduction can be challenged.

Lenders do not track the tax purpose of funds. That obligation sits with you. Refinancing also resets your loan term, which can extend the period over which interest is paid and therefore the total deduction over time, but it increases the total interest cost in dollar terms.

Repayment structure affects short-term deductions and long-term wealth

Interest-only investment loans maximise the annual interest deduction because the loan balance does not reduce. Principal and interest repayments lower the balance each month, which lowers the interest charged and therefore the deduction. Over a 30-year hold, an interest-only loan results in significantly more interest paid and more tax deducted, but the loan balance at sale is identical to the original amount borrowed.

Principal and interest reduces the loan over time, which builds equity faster and reduces interest cost. The trade-off depends on your marginal tax rate, your other income, and your long-term plan for the property. For buyers in Clyde or Clyde North with strong cash flow from employment, paying down the investment loan while holding an owner-occupied loan with an offset can be less efficient than doing the reverse, because owner-occupied interest is not deductible.

Loan structure decisions made at settlement have tax consequences for the life of the loan. Unwinding a poorly structured loan is possible, but it usually involves refinancing costs, discharge fees, and sometimes a new valuation.

Call one of our team or book an appointment at a time that works for you. We work with property investors across Clyde and Clyde North to structure investment property finance in a way that protects deductions, manages cash flow, and aligns with the legislative changes taking effect from July 2027.

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