Four months after Australia’s Parliament passed the biggest change to property-investment tax rules in a generation, rental listings are falling in every capital city and auction clearance rates have dropped to a five-year low — the first hard data confirming what both supporters and critics of the reform predicted, for very different reasons, according to figures from Neoval, Cotality and the Reserve Bank of Australia published between June and October 2026.
What Actually Changed, and When
The changes originate in the Australian Government’s 2026–27 Budget, handed down at 7:30pm AEST on 12 May 2026 (“Budget night”). They became law on 25 June 2026, when the Senate passed the Treasury Laws Amendment (Tax Reform No. 1) Bill 2026 with the support of the Greens — after the Government dropped a separate provision, sometimes called the “widow tax,” that would have affected how negatively geared property is treated after a co-owner’s death. The House of Representatives ratified the final, Senate-amended bill 98 votes to 39.
Two mechanisms are involved, both commencing 1 July 2027. First, negative gearing: for residential property bought after Budget night, losses can no longer be deducted against salary or other non-rental income. Those losses are instead quarantined — carried forward and deductible only against future residential-property income, including a capital gain on that same category of property — and if a later sale doesn’t produce enough gain, the carried-forward loss can be permanently lost. Newly built residential property is exempt from this restriction and can still be negatively geared in the ordinary way, and any property already held before Budget night is grandfathered and unaffected. Second, capital gains tax: the 50 per cent CGT discount is replaced with cost-base indexation tied to the CPI — a return to the regime that applied before the discount was introduced on 21 September 1999 — plus a new 30 per cent minimum effective tax rate on the real (indexed) gain for assets sold after 1 July 2027. Investors in new residential builds can choose between the old discount and the new indexation-plus-minimum-tax method.
Taken together, this answers a question that has been circulating among investors since the bill passed: a negative-gearing loss quarantined under the new rules does not disappear, and it is not blocked from reducing a later capital gain — it is simply restricted to being used against rental income and gains from residential property specifically, rather than against a salary. Because the 30 per cent minimum tax applies to the net real gain, an available quarantined loss reduces the base the minimum tax is calculated on, rather than sitting outside it.
Investors Are Already Moving — What the Data Shows
The first behavioural data lines up with the May 2026 Budget, not with the June legislative passage, suggesting investors acted on the announcement rather than waiting for royal assent. Rental-listing figures from data provider Neoval show listings falling across every capital city in May 2026: Sydney was hit hardest, down 1.5 per cent for the month and 9.8 per cent over the year; Melbourne listings fell 1.7 per cent; Darwin fell 2.1 per cent; Hobart fell 0.3 per cent. Separately, Cotality data cited in the same period showed overall for-sale listing volumes approaching levels last seen at the COVID-19 peak, while the capital-city auction clearance rate dropped to 51.1 per cent — down from more than 60 per cent a year earlier, and the lowest reading in roughly five years. Ray White chief economist Nerida Conisbee linked the shift directly to the Budget, noting buyer and seller behaviour changed once the changes were announced, and warned that as more investor-owned homes sell to owner-occupiers, fewer homes remain available to rent — on top of rental availability that was already tightening before the reform.
Readers may also see a widely circulated claim that ex-rental properties now make up 40 per cent of Melbourne listings. Zagdim could not independently verify that specific figure: the original report was not directly accessible, and the alternative Melbourne- and Victoria-specific data we could verify — including separate 2024 figures tied to state land-tax changes rather than this federal reform — measured a different period, a different cause, or a different metric, so we have not repeated the 40 per cent number here. What the verified, dated 2026 data does show is a clear, broad-based pull-back in rental listings across every capital city in the month the Budget was handed down.
A Historic Correction, or a Supply Shock? The Reform Debate
The reform doesn’t have one single, agreed story about what it will do to supply — it has two, from parties with opposing interests, and both have been making their case publicly since well before the bill passed. The Australia Institute, a think tank that has pushed for this change for years, argued in 2024 — through senior economist Matt Grudnoff — that negative gearing and the CGT discount together cost the federal budget around A$20 billion a year, more than twice what state and territory governments spent on public and community housing in 2022-23; that more than two-thirds of that benefit flows to the top 10 per cent of income earners while the bottom half of taxpayers get less than a tenth; and that just 1 per cent of taxpayers own a quarter of all investment properties. Its policy prescription — restrict negative gearing to new housing, scrap the CGT discount, and redirect the revenue into building more homes — is close to what Parliament has now legislated. Zagdim was not able to directly access the Institute’s specific October 2026 commentary on the now-passed reform, so this account reflects its long-published, verifiable position rather than that article’s exact wording.
The property industry disputes the supply consequences just as publicly. Property Council of Australia chief executive Mike Zorbas said after the bill passed that, “according to the government’s own numbers, these new laws are a tax ball and chain that shrinks housing supply by 35,000 homes” over ten years — a figure the Council says comes from Treasury’s own modelling of the reform, not solely its own. Separate modelling commissioned jointly by the Property Council, Master Builders Australia, the Housing Industry Association and the Real Estate Institute of Australia found that, even allowing for the Government’s offsetting Local Infrastructure Fund, new dwelling starts would still be around 8,700 lower over four years than they otherwise would have been. Neither side’s figures are independently audited in what we could access, and both are framed by parties that lobbied hard on opposite sides of the legislation — which is itself part of why readers should treat each number as an advocacy position citing a real but contested government or industry estimate, not as a settled fact.
A Separate Story, Same Moment: How Exposed Is the Banking System?
A third, unrelated story has circulated alongside the tax-reform coverage this week, and it is worth being precise about what it is and isn’t. It is not a report about negative gearing or capital gains tax. It is the Reserve Bank of Australia’s regular Financial Stability Review, published in October 2026, which modelled a deliberately severe — and, by the RBA’s own description, considerably harsher than its usual outlook scenarios — hypothetical shock to check how resilient Australia’s banks are to a serious downturn, independent of any specific policy change.
In that scenario, the cash rate peaks at 5.6 per cent, unemployment rises to 6.3 per cent, GDP falls 1.4 per cent, national house prices fall 20 per cent, and inflation rises to 7 per cent. Running its top-down stress-testing model against the large banks under those conditions, the RBA concluded the banking system “remains resilient” even to a shock of that severity; the regulator APRA reached a consistent conclusion in parallel testing. For readers following the property-tax story, the relevant point is narrower than the headline numbers suggest: this stress test is a general check on system-wide resilience, not a forecast tied to the negative-gearing and CGT changes, and nothing in the RBA’s published scenario claims a causal link between the two stories. It is useful background precisely because it shows what Australia’s own central bank and prudential regulator consider a plausible worst case for the housing market generally — a 20 per cent national price fall — at the same moment investors are adjusting to a tax reform whose own advocates and critics are still arguing over how much it will move supply.
Zagdim’s View — The mechanism itself is now settled and dated: anything bought before 12 May 2026 keeps its existing tax treatment, new builds keep negative gearing regardless of purchase date, and the minimum tax and negative-gearing quarantine both start biting on 1 July 2027 — not before. What’s genuinely still open is how much the reform reshapes supply over the coming decade, and the honest answer is that the two loudest camps — a think tank that has long argued for this exact change, and an industry body that lobbied against it — are citing government and industry modelling that point in opposite directions, with the real number probably somewhere between them and not yet independently settled. For anyone holding or buying Australian residential property from overseas, the one thing that is independently verifiable today is the near-term data: rental listings down across every capital city in the month the Budget was announced, and auction clearance rates at a five-year low. The banking-system backdrop is a separate, regulator-run exercise, not a verdict on this specific reform — but it is a useful reminder that Australia’s own central bank already treats a 20 per cent nationwide house-price fall as a plausible, not fringe, scenario worth stress-testing for.
References
Australian Government Treasury – Tax Explainers: Negative Gearing and Capital Gains Tax / EY Global Tax News – Australia’s 2026 Budget Negative Gearing and Capital Gains Tax Reform / The Canberra Times (AAP) – Tax Changes Spark House Listings Boom but Fewer Rentals / The Nightly – Labor’s Controversial Negative Gearing, CGT Reforms Pass Into Law After Greens Deal / Property Council of Australia – Fewer Homes, Weaker Investment as Greens Okay Tax Hikes / The National Tribune (Australia Institute release) – Negative Gearing and Capital Gains Tax Discount Driving Up House Prices / Reserve Bank of Australia – Financial Stability Review, October 2026
