Tax Rules Create Artificial Incentives for Property Speculation
A comprehensive new analysis from the e61 Institute has revealed how Australia's capital gains tax discount and negative gearing rules have turbocharged debt-fuelled property speculation over recent decades. The research examined hundreds of thousands of property transactions and found these tax settings have created what economists describe as an "extra artificial incentive" for landlords to maximize borrowing against investment properties.
Distorted Investment Behavior and Reduced Tax Rates
The analysis demonstrates how current tax rules have significantly distorted investor behavior. Of the 900,000 investments in e61's sample purchased after 2007 and sold by mid-2025, approximately 46,000 were economically unprofitable but still generated returns due to the capital gains tax discount. The research shows how these tax provisions reduced the probability of a property investment being economically unprofitable from 40% to 35% - a substantial reduction of 5.1 percentage points, or 13%.
Economist Nick Garvin, who co-authored the report with Matt Nolan, explained that the current system creates a fundamental imbalance. "The research showed how the current tax rules were creating a difference between how the gains of the investment are taxed and how the losses on interest costs are taxed," Garvin stated. This differential treatment means landlords can write off all their interest expenses against their incomes while only paying tax on 50% of capital gains for properties held longer than a year.
The Leverage-Tax Paradox
The analysis uncovered a counterintuitive relationship between borrowing and taxation. For investment properties with no debt, the typical tax on returns was 31%. However, this rate dropped progressively to just 18.5% for properties with the highest loan-to-value ratio of 90%, despite these highly leveraged investments generating substantially higher pre-tax profits. Essentially, the more investors borrow, the higher their profits become, and the lower their effective tax rate falls.
"This wedge between the tax on asset-side gains, and the tax deduction on liability-side losses has distorted investor behavior and boosted leverage," the report concluded. Garvin emphasized that equal tax treatment would only allow half of interest expenses to be deducted against income. "And it's specifically that difference that can be exploited by investors by leveraging up," he noted.
Impact on Housing Affordability and Market Dynamics
The additional incentive to borrow more has significantly boosted investor demand for housing over the years. "This has almost certainly put upward pressure on housing prices, although gauging how much is difficult," Garvin acknowledged. The research indicates that current tax settings have contributed to higher house prices than would otherwise have occurred, playing a substantial role in Australia's ongoing affordability crisis.
A Greens-led parliamentary inquiry earlier this month reached similar conclusions, finding that the 50% discount "skewed the ownership of housing away from owner-occupiers and towards investors." The federal budget expected in three weeks is widely anticipated to include changes to these tax breaks for investors, aiming to rebalance the tax system away from the wealthiest Australians and alleviate pressure on home prices.
Potential Reforms and Policy Considerations
Treasury is currently modeling changes that could see the capital gains tax discount reduced to 33% specifically for housing investors, while retaining the current rate for shares and other investments. There is also speculation about potential limits on the number of properties a single investor can negatively gear.
Garvin emphasized that the design of the discount itself, rather than just the rate, is driving problematic investment behavior. "A lot of the debate around changing the CGT discount rate has been focused on the effect on housing prices, but this channel we are pointing out in our note is potentially the most important one," he explained. The e61 Institute has backed an inflation-linked discount on capital gains, suggesting that equal treatment of debt expenses and capital gains would remove the current bias toward excessive borrowing for property investment.
As regular Australians continue to struggle with housing affordability, the research provides crucial evidence about how tax policy has shaped investment behavior and contributed to current market conditions. The findings come at a critical time as policymakers consider reforms to address one of Australia's most pressing social and economic challenges.
