Avoid These Tax Deduction Mistakes on Investment Loans

Tax Deductions Start With Loan Purpose, Not Security

The deductibility of interest on an investment loan depends entirely on what the borrowed funds are used for, not which property secures the loan. Interest is deductible against assessable income only to the extent the property is rented or held to produce assessable income. If you redraw funds from an investment loan to pay for a holiday or home renovation, that portion of the interest is no longer claimable, even though the loan remains secured against your rental property.

Consider an investor who refinanced a rental property in Fremantle to access equity. The property had a remaining debt of $400,000, and the investor released $150,000 in equity to fund personal expenses. The refinanced loan totalled $550,000. Only the interest attributable to the original $400,000 and any amount used to improve or maintain the investment property remains deductible. The $150,000 used for private purposes generates non-deductible interest. Lenders do not track loan purpose at the transaction level, so the obligation to apportion and document purpose falls entirely on the borrower.

Interest-Only Structures Can Maximise Deductions in the Accumulation Phase

Interest-only investment loans allow you to claim the maximum deductible interest expense in each financial year without reducing your loan balance. Principal repayments on an investment property are not tax deductible, so paying down investment debt while carrying non-deductible owner-occupier debt erodes your tax position. An interest-only period typically runs for one to five years, after which the loan reverts to principal and interest unless you request an extension or refinance.

As an example, an investor holding a property in Brabham with a loan amount of $680,000 on an interest-only structure at current variable rates would claim the full interest expense against rental income and other assessable income each year. If the same loan were structured as principal and interest, the annual interest component would decrease as the loan balance amortised, reducing the claimable deduction by several thousand dollars over the first five years. That reduction delivers no tax benefit, and the capital repaid into the investment property cannot be redeployed without triggering a new borrowing event and potential recontribution issues.

Fixed or Variable Rate and the Deduction Timing Question

Both fixed and variable rate investment loans generate fully deductible interest, but the structure you choose affects cash flow and the ability to make extra repayments without penalty. Fixed rate loans lock in your interest expense for a set term, which aids budgeting and protects against rate rises, but they typically prohibit additional repayments above a small annual threshold and impose break costs if you refinance or sell before the fixed term ends. Variable rate loans allow unlimited extra repayments and penalty-free exit, but your interest expense fluctuates with rate movements.

An investor holding a property in Mosman Park locked a $1,100,000 loan at a fixed rate for three years to protect cash flow during a period of rate volatility. Twelve months into the term, the investor received an inheritance and wanted to reduce debt. The lender permitted up to $10,000 in additional repayments per year on the fixed portion without penalty. Any repayment above that threshold triggered break costs calculated on the present value of the interest rate differential between the fixed rate and the rate at which the lender could now lend the released funds. The investor chose to park the excess funds in an offset account linked to an owner-occupier loan instead, avoiding break costs and preserving the full deductible interest on the investment loan.

Negative Gearing Under the New Rules From 2027-28

Losses from established residential investment properties acquired after 7:30pm AEST on 12 May 2026 can be deducted only against other income from residential properties, including capital gains on residential properties, from the 2027-28 income year onward. Excess losses carry forward to offset residential property income in future years. Properties held at 12 May 2026, including those under contract awaiting settlement at that time, continue to be fully deductible against all income until sold. Eligible new builds acquired after 12 May 2026 also retain full negative gearing against all income.

For Perth investors, this changes the calculus for acquiring established stock in markets like Fremantle, Bicton, or Palmyra, where house yields sit below 3.5 per cent and negative gearing has historically subsidised the carrying cost during capital accumulation. From the 2027-28 income year, an established property generating an annual loss of $15,000 will reduce your taxable income by that amount only if you have other residential property income to offset it against. If you hold no other residential property income, the $15,000 loss is quarantined and carried forward. The marginal tax benefit of the loss is deferred until you generate residential property income or dispose of a residential property and realise a capital gain.

Borrowing Costs, LMI and Loan Establishment Fees

Loan establishment fees, valuation fees, legal costs related to preparing and registering the mortgage, and Lenders Mortgage Insurance premiums are all claimable, but the deduction is apportioned over five years or the term of the loan, whichever is shorter. If you paid $8,000 in LMI and $1,200 in establishment fees when settling an investment loan, the total borrowing cost of $9,200 is deductible at $1,840 per year over five years. If you refinance or discharge the loan in year three, you can claim the remaining unamortised balance in the year of discharge.

Mortgage broker fees paid to arrange an investment loan are immediately deductible in the year incurred, provided the fee relates to arranging finance for the investment property. Ongoing loan account fees, such as monthly service fees or annual package fees, are also fully deductible in the year they are charged. Offset account fees are deductible only if the offset account is linked to an investment loan. Redraw fees on an investment loan are deductible if the redrawn funds are used for investment purposes.

Rental Property Holding Costs Beyond Interest

Council rates, water and sewerage charges, building and contents insurance, landlord insurance, property management fees, strata levies, and repairs are all deductible in the year incurred, provided the property is rented or genuinely available for rent during that period. Genuine availability requires the property to be advertised at a market rent through appropriate channels. Holding a property vacant for personal use or listing it at an inflated rent to avoid tenanting it will disqualify the deductions for that period.

Repairs are immediately deductible if they restore the property to its previous condition without improving it. Replacing broken roof tiles, repairing a damaged fence, or repainting a room in the same colour are repairs. Renovating a kitchen, extending a building, or replacing an entire roof with a superior material are capital improvements, and the cost is added to the property's cost base for capital gains tax purposes rather than claimed as an immediate deduction. Depreciating assets such as ovens, air conditioners, blinds, and carpet can be claimed under Division 40 of the Income Tax Assessment Act 1997 using either the diminishing value or prime cost method over the asset's effective life.

Capital Gains Tax Treatment From 1 July 2027

From 1 July 2027, the 50 per cent capital gains tax discount for individuals, trusts, and partnerships on affected assets is replaced by cost base indexation using CPI and a 30 per cent minimum tax rate on real capital gains accruing from that date. For assets owned before 1 July 2027 and sold after that date, gains are taxed under the current 50 per cent discount rules for the portion accruing before 1 July 2027 and under the new indexation rules for the portion accruing after that date. Eligible new build residential properties retain access to both the existing 50 per cent discount and the new indexation method as a choice at disposal.

An investor who purchased an established property in Joondalup in March 2025 and sells in December 2028 will need to apportion the gain between the pre-1 July 2027 period, which attracts the 50 per cent discount, and the post-1 July 2027 period, which is indexed for inflation and subject to the 30 per cent minimum rate. The apportionment can be done using a market valuation as at 1 July 2027 or an ATO-published formula. The shift materially changes the after-tax return for properties held over long timeframes, particularly in low-yield, high-growth markets where capital appreciation has historically compensated for negative cash flow.

Debt Recycling to Convert Non-Deductible Debt Into Deductible Debt

Debt recycling is a strategy that allows you to progressively convert non-deductible owner-occupier debt into deductible investment debt by using available equity to acquire income-producing assets. Each time you make a principal repayment on your owner-occupier loan, you redraw that amount and deploy it into an investment, such as shares or an investment property. The redrawn amount is borrowed for investment purposes and generates deductible interest.

An investor in Bullsbrook with $200,000 remaining on an owner-occupier loan and $300,000 in equity in that property could establish a split loan structure, progressively redrawing principal repayments and using the funds to acquire an investment property or contribute to a diversified share portfolio. Over time, the non-deductible owner-occupier debt is retired, and the total debt profile shifts to fully deductible investment debt. The strategy requires careful record-keeping to demonstrate loan purpose at each step and is most effective when implemented with offset accounts to maintain liquidity without contaminating loan purpose.

Record Keeping and ATO Compliance

The ATO requires you to substantiate every deduction claimed. For interest deductions, you must retain loan statements showing the interest charged, evidence of how the borrowed funds were used, and records of any redraws or refinances that altered the loan purpose. For repairs and depreciating assets, you need tax invoices, receipts, and a depreciation schedule prepared by a quantity surveyor. The depreciation schedule is a one-off cost, typically between $600 and $1,200 depending on the property age and complexity, and is itself deductible over five years.

Rental income and expenses should be recorded in real time using a spreadsheet or accounting software, and bank statements must be reconciled at year-end. Property management statements are helpful but not sufficient on their own, as they do not capture owner-paid expenses such as insurance, council rates, or loan interest. If you hold multiple investment properties, each property's income and expenses must be tracked separately, as the ATO assesses each property individually and losses from one property cannot be offset against gains from another for the purpose of the negative gearing quarantine introduced from the 2027-28 income year.

Call one of our team or book an appointment at a time that works for you.

Frequently Asked Questions