CGT and Negative Gearing Changes in Australia : What the Evidence Actually Says

The debate over negative gearing and the capital gains tax discount has been running in Australia for decades. It surfaces before nearly every federal budget, generates enormous heat, and produces very little light.

In 2026, the conversation is live again. Reported proposals to reduce the CGT discount and limit negative gearing benefits for property investors have returned to public discussion, and Australians, whether they own investment properties, rent, or are trying to buy their first home want to know what would actually happen if the rules changed.

This article works through the evidence carefully. It separates confirmed policy from speculation, distinguishes national trends from local conditions, and draws conclusions only where the evidence supports them. It does not provide financial, tax, or legal advice. It is general market commentary intended to help informed Australians think clearly about a complex debate.

Executive Summary | CGT and Negative Gearing Changes in Australia

As of the date of publication, no legislation reducing the CGT discount or restricting negative gearing for residential property investors has been confirmed. Reported proposals and pre-budget commentary have circulated in Australian media, but these remain unconfirmed policy positions.

What the evidence suggests, if reform of some kind were introduced: investor demand would likely soften, particularly among leveraged investors who depend on tax-assisted capital growth to justify low rental yields. House price growth would more likely slow or modestly correct than collapse. The claim that rents would automatically surge is not well supported by evidence, rents are driven more by vacancy rates and supply conditions than by landlord yield preferences. In a tight rental market, however, any reduction in rental supply before new supply is created carries genuine risk of upward rent pressure in specific locations.

Tax reform does not build homes. Reallocating ownership of existing stock is not the same as increasing supply. Timing, design, grandfathering provisions, and supply-side accompaniments would determine whether any reform was economically sound or poorly executed.

What Is Actually Being Discussed?

The CGT Discount

When an Australian resident sells an investment property held for more than twelve months, they are currently eligible for a 50 per cent discount on the capital gain before it is added to their taxable income. This means an investor who makes a $200,000 capital gain includes only $100,000 in assessable income for that year. The ATO explains the current CGT discount rules on its website.

This discount was introduced in September 1999 following the Review of Business Taxation — commonly known as the Ralph Review — which recommended replacing the previous indexation method with a flat percentage discount. Academic analysis published in the UNSW Law Journal confirms the switch was broadly favourable to investors in a rising market. Reported reform proposals have most commonly suggested reducing the discount to 25 per cent rather than eliminating it entirely.

Negative Gearing

Negative gearing refers to the practice of deducting losses on an investment property where rental income falls short of interest payments and running costs against other income such as wages or salary. The ATO explains the mechanics of negative gearing in its rental properties guide. The net effect is a reduction in taxable income in the year the loss occurs.

Under current Australian tax law, this is not a special concession unique to property. As the Treasury’s own negative gearing overview explains, it reflects the broader principle that losses from income-producing activities can be offset against other income. Property investors have historically used it at scale because residential property investment in Australia has often been structured around the expectation of capital gain rather than immediate rental income.

Reported reform proposals have generally focused on limiting negative gearing to newly constructed properties only, or quarantining losses so they can only be offset against future income from the same investment, a model similar to the brief quarantine experiment of the 1980s.

What Is Confirmed and What Is Not

As of April 2026, no legislation has been introduced or confirmed. The proposals in current public discussion are reported pre-budget positions or political commentary. What can be examined honestly is the evidence base for what would likely happen if various versions of reform were implemented.

How Australia Got Here: A Historical Timeline

Before 1985 — The Pre-CGT Era

Prior to 1985, Australia had no capital gains tax. Investment property was attractive partly because capital gains were entirely tax-free. Negative gearing losses could be offset against other income, and since the upside on sale was untaxed, the combination was highly favourable for investors with strong income.

1985 — CGT Introduced and Negative Gearing Quarantined

The Hawke government introduced capital gains tax from 20 September 1985. Following the July 1985 Tax Summit, the government simultaneously quarantined negative gearing losses. Australian Parliamentary Library records confirm the quarantine applied only to future rental property purchases, with existing investments grandfathered.

1987 — The Quarantine Is Reversed

The negative gearing quarantine lasted less than two years. The Hawke government reversed it in September 1987, restoring full and immediate deductibility of rental losses. Research published by AustaxPolicy — drawing on cabinet documents from the period has shown the reversal was driven partly by political pressure ahead of the 1988 New South Wales state election, and partly by broader macroeconomic concerns rather than solely by rental market outcomes.

1999 — The 50 Per Cent CGT Discount

The Howard government’s 1999 reforms, following the Ralph Review of Business Taxation, replaced CGT indexation with the current 50 per cent discount for assets held more than twelve months. The post-1999 period coincided with a sustained period of strong house price growth in Australian capital cities.

Post-1999 — Investor Demand Grows

The combination of negative gearing deductibility and a generous CGT discount created strong incentives for Australians to hold leveraged investment properties even when rental yields were low or negative in cash flow terms. According to RBA research on macroprudential lending limits, APRA introduced a 10 per cent annual growth cap on investor housing credit in late 2014, followed by limits on interest-only lending in 2017, in response to rapidly rising investor credit and housing prices. APRA has confirmed these were intended as tactical, temporary constraints that were later removed when risks subsided.

2025–2026 — The Current Debate

Reports ahead of the 2025 and 2026 federal budgets have included recurring speculation about potential reforms to both the CGT discount and negative gearing. The political context, housing affordability concerns, rental market tightness, and first-home buyer difficulty has kept the issue prominent. No confirmed reform package has been legislated as of the date of this article.

What the Historical Evidence Actually Suggests

The 1985–87 negative gearing quarantine is the episode most commonly cited in this debate. The standard account negative gearing was removed, rents soared, the government reversed course has been repeated so often it has acquired the status of settled fact. The actual evidence is considerably more complicated.

As the Wikipedia article on negative gearing in Australia summarises, economist Saul Eslake has argued that rent increases during the quarantine period were limited to Sydney and Perth, and that those cities already had unusually low vacancy rates before the policy change, suggesting other factors were responsible. Rents in Melbourne did not follow the same pattern. Analysis published by ACOSS reinforces this interpretation, noting that the main causes of housing investment slump in Sydney and Perth were higher interest rates and the share market boom of the mid-1980s rather than the policy change itself.

Research published by AustaxPolicy further confirms that cabinet documents from the period show the reversal was at least partially driven by macroeconomic concerns — including fears about capital flight and Australia’s current account deficit, rather than by the rental market evidence alone.

The historical sample size is also very limited. Two years of one experiment, in one country, during one set of economic conditions, is a thin evidence base for strong conclusions in either direction. Researchers generally treat this episode as suggestive rather than definitive.

How CGT and Negative Gearing Shape Investor Behaviour

Australian residential property investment has historically been structured around a specific financial logic: accept a low or negative rental yield in the short term, in exchange for expected capital gain in the medium to long term. As the Treasury’s overview of negative gearing explains, while making a loss on an investment property might initially seem counterintuitive, some investors are willing to do this in the expectation that the capital gain on sale will more than offset the accumulated losses.

Negative gearing makes the short-term loss bearable by reducing taxable income. The CGT discount amplifies the after-tax value of the eventual capital gain. Together, they support a model where the investment makes financial sense primarily because of tax-assisted capital appreciation.

If either concession were reduced, the required gross yield to achieve the same after-tax return increases. For some investors particularly those with high leverage or properties in lower-growth markets, the numbers may no longer work. The effect would not be uniform across investor types. A high-income earner using negative gearing against the top marginal tax rate derives more benefit from the deduction than a low-income investor. And as the Parliamentary Library’s historical record confirms, whether grandfathering provisions protect existing investments determines much of the short-term behavioural effect.

Would Rents Rise?

This is the most politically charged question in the debate. It deserves a careful answer.

The simple claim holds that if investors sell up or stop buying, rental supply falls, and rents must rise. The historical and analytical evidence does not support this as a national generalisation. Rents are set by the intersection of supply and demand in local rental markets, not primarily by landlord cost recovery preferences.

According to SQM Research’s national vacancy rate data, Australia’s national rental vacancy rate fell to 1.1 per cent in February 2026, near multi-year lows. The National Housing Supply and Affordability Council’s State of the Housing System 2025 report confirmed that new housing supply fell well short of underlying demand in 2024, with 177,000 new dwellings completed against an estimated demand of 223,000. In this environment, any further reduction in rental supply carries genuine risk of upward rent pressure.

However, as the 1985–87 evidence suggests, this risk is a function of local vacancy conditions not an automatic national outcome. In markets with adequate rental supply, investor retreat leads to vacant stock or sales to owner-occupiers, not necessarily higher rents.

Would House Prices Fall?

A reduction in investor demand would, all else being equal, exert downward pressure on prices relative to where they would otherwise have been. The distinction matters. A market growing by 4 per cent instead of 8 per cent is not a crash. It is a slower market.

The NHSAC’s State of the Housing System 2025 report noted that national dwelling prices rose by 4.9 per cent over 2024 and a further 0.7 per cent over the first three months of 2025, with affordability at record lows the median household needing to spend 50 per cent of income to service the average new mortgage. In this environment, modest price moderation from reduced investor demand would not be unwelcome for affordability, but a dramatic collapse is not what credible analysis projects.

Owner-occupier demand does not disappear when investor demand softens. If investor retreat creates slightly more accessible entry prices, first-home buyer demand may partially offset the reduction. Whether first-home buyers genuinely benefit depends on whether price moderation is meaningful relative to their borrowing capacity.

Would This Create More Homes?

No. Not automatically, and not directly. This is one of the most important structural points in the entire debate. Reducing investor tax concessions changes who owns existing homes. It does not build new ones.

The NHSAC’s 2025 report and the Treasury’s National Housing Accord page both confirm that Australia is currently forecast to build approximately 938,000 dwellings over the five-year Housing Accord period, 262,000 short of the 1.2 million target. ABS building activity data confirms that in 2025, approximately 196,000 homes commenced construction, around 18 per cent below the annual pace required to meet the Accord target.

Supply-side policy planning reform, zoning liberalisation, infrastructure provision, and incentivising new dwelling completions is the mechanism through which more homes are actually created. Tax reform on the demand side does not substitute for this. Poorly designed tax reform that reduces investor participation in the new-build market could make the supply problem worse in the short term.

Current Market Context

The debate is occurring against conditions that matter enormously for how any reform would land. SQM Research data shows the national rental vacancy rate at 1.1 per cent in February 2026, near multi-year lows. The NHSAC has confirmed that net housing completions fell short of newly formed households by approximately 68,000 in 2024 alone.

New dwelling commencements are running materially below the Accord’s required pace. The NHSAC’s State of the Housing System 2025 report identifies labour shortages, construction cost inflation, planning delays, and project feasibility challenges as contributing factors. The 2025–26 federal budget housing page confirms that just 45,000 new homes were completed in the first quarter of the Housing Accord.

In this context, timing matters enormously. Introducing demand-dampening reforms into a market that is already under-supplied and experiencing genuine rental stress is structurally different from introducing the same reforms in a well-supplied market with moderate vacancy.

Scenario Analysis

Scenario A — Mild CGT Discount Reduction Only

Under a mild reduction in the CGT discount for example from 50 per cent to 33 per cent the impact on current investors would be limited if grandfathering protects existing properties. Future investors would face a reduced after-tax return on capital gain, making marginal investment cases less attractive. The rental market effect would be limited in the short term. Prices would likely experience modest dampening rather than a correction. First-home buyers might benefit marginally at the entry end of the market. This is the least disruptive scenario but also the least likely to produce meaningful affordability improvement on its own.

Scenario B — CGT Reduction Plus Negative Gearing Limits on New Purchases

A combined reform carries more significant market implications. Future investors would face materially higher holding costs without loss deductibility. Rents face a higher risk of upward pressure in tight markets, as marginal investors exit or do not enter. Price moderation would be more visible, particularly in investor-heavy suburbs. First-home buyers could benefit more meaningfully from reduced competition, but face the countervailing risk of tighter rental conditions while still saving for a deposit. A significant policy risk is the potential for reduced investor participation in new residential construction, weakening project feasibility and commencement numbers.

Scenario C — Broader Reform With Grandfathering and Supply-Side Offsets

A well-designed reform package that grandfathers existing investments, applies new rules only to future purchases, and couples demand-side changes with explicit supply-side policy planning reform, incentives for build-to-rent, social housing investment is the most defensible configuration. Disruption to the existing rental market is minimised. Price moderation is gradual. First-home buyers benefit most sustainably because price moderation is not offset by a rental market crisis. This scenario is the most complex to design and implement, and its success depends on supply-side measures being delivered rather than deferred.

Is the Decision Sound or Unsound?

The honest answer is that it depends on design, timing, and what accompanies it.

A blunt, ungrandfathered removal of negative gearing deductibility, introduced during a period of historically low rental vacancy and under-supply of new dwellings, would carry real risks for the rental market. It would reduce investor demand, probably modestly reduce price growth, and would not, by itself, create more homes. In that configuration, at this point in the cycle, the reform would be poorly timed and structurally incomplete.

A carefully designed, grandfathered reform that limits concessions on existing property investment over time, preserves or enhances incentives for investment in new residential construction, and is accompanied by genuine supply-side policy is a more defensible proposition. The economic literature generally supports the view that the current combination of CGT discounts and negative gearing has contributed to elevated prices relative to fundamentals. Addressing that distortion in an orderly, sequenced way is not inherently unsound.

Reform that is gradual, grandfathered, supply-aware, and timed to coincide with improving vacancy conditions is more likely to achieve its affordability objectives without causing collateral damage to the rental market. Reform that is abrupt, ungrandfathered, and introduced in isolation from supply policy is more likely to create disruption without durable improvement.

Myth vs Evidence

Myth: Removing negative gearing will automatically cause rents to surge across Australia.
Evidence: The 1985–87 episode showed rent increases in Sydney and Perth but not Melbourne. As the Wikipedia article on negative gearing in Australia summarises, economist Saul Eslake and others have attributed the increases to pre-existing low vacancy in those cities rather than the policy change itself.

Myth: Cutting the CGT discount will crash house prices.
Evidence: Most analysis projects modest price moderation rather than collapse. Owner-occupier demand partially offsets reduced investor demand. The NHSAC’s 2025 report shows the housing market is under affordability stress, not in speculative bubble territory likely to collapse.

Myth: These reforms will create more homes.
Evidence: They would not, directly. The NHSAC’s 2025 report is clear that new supply requires planning reform, construction capacity, and project feasibility none of which are addressed by CGT or negative gearing changes.

Myth: First-home buyers will immediately benefit.
Evidence: First-home buyers may benefit from modest price moderation. However, the NHSAC noted average deposit saving time already stood at 10.6 years in 2024. If rents simultaneously rise, aspiring buyers are worse off until they can purchase.

What to Watch

• Whether any formal budget proposal is released and, if so, whether grandfathering is included.
• Rental vacancy rates at the time of implementation — SQM Research publishes these monthly.
• Whether supply-side measures accompany any demand-side reform.
• New dwelling commencement data from the ABS and Treasury, which signals whether supply is improving.
• APRA’s stance on investor lending, which interacts directly with the tax settings.

Key Takeaways

For property investors: Any reform would most likely affect future purchasing decisions more than existing portfolios, especially if grandfathering is included. The financial case for negatively geared investment in low-yield, high-price markets would weaken.

For homeowners: Modest price moderation in investor-heavy markets is plausible. A market crash is not the likely outcome of well-designed reform.

For renters: Rents are already under pressure from structural supply shortages. The NHSAC reports that advertised rents rose 4.8 per cent over 2024 and a further 1.7 per cent in the first quarter of 2025. Tax reform alone does not resolve structural undersupply.

For first-home buyers: Gradual price moderation is potentially helpful, but only if rents do not simultaneously worsen the affordability of saving for a deposit. The NHSAC’s Scenario C — supply-linked reform with grandfathering — offers the most favourable outlook.

Frequently Asked Questions

What is negative gearing in Australia?

Negative gearing is the practice of deducting investment property losses against other income such as wages. The ATO’s rental properties guide explains that where rental income is less than deductible expenses, a net rental loss arises and may be claimed against other income. It applies under general Australian tax law, not as a specific property concession.

What is the CGT discount on investment property?

The ATO’s CGT discount page explains that Australian residents who have held an investment property for more than twelve months can reduce their capital gain by 50 per cent before including it in assessable income. This effectively halves the tax on the profit from the sale. A reduction to 25 per cent has been discussed in various reform proposals.

Will changing negative gearing increase rents?

Not necessarily, and not uniformly across Australia. SQM Research data shows the national vacancy rate at 1.1 per cent in February 2026 near historic lows. In a well-supplied market, investor retreat does not automatically translate to higher rents. In a tight market with very low vacancies, reduced rental supply carries genuine risk of upward rent pressure.

Will reducing the CGT discount crash house prices?

This is unlikely based on available evidence. The NHSAC’s 2025 report shows prices rose 4.9 per cent in 2024. Most credible analysis suggests modest price moderation rather than a crash. Owner-occupier demand would partially offset reduced investor demand, and the effect would be gradual particularly if grandfathering protects existing investments.

Would first-home buyers benefit from these reforms?

Potentially, but not automatically. The NHSAC’s 2025 report found the average deposit saving time reached a near-record 10.6 years in 2024. First-home buyers may benefit from modest price moderation, but if rents simultaneously rise in a tight market, many aspiring buyers would find saving for a deposit harder. The net benefit depends heavily on reform design and supply-side conditions.

Does cutting investor tax breaks create more homes?

No. The NHSAC’s 2025 report forecasts only 938,000 dwellings will be completed over the Housing Accord period 262,000 short of the 1.2 million Housing Accord target. Reducing tax concessions shifts ownership of existing properties. New supply requires planning reform, construction capacity, and project feasibility.

What happened when Australia changed negative gearing in the 1980s?

The Hawke government quarantined negative gearing losses in 1985 and reversed the change in 1987. As the Wikipedia article on negative gearing in Australia summarises, rents rose in Sydney and Perth but remained stable in Melbourne. Research — including by economist Saul Eslake  attributes those increases to pre-existing low vacancy conditions. Parliamentary Library records confirm the reversal also had a significant political dimension ahead of the 1988 NSW state election.

Why do vacancy rates matter more than investor sentiment for rents?

Rents are set by what tenants will pay and what alternatives are available not solely by landlord cost recovery needs. SQM Research’s vacancy data shows that when vacancy is near 1 per cent, tenants have very limited alternatives and rents can rise. When vacancy is higher, landlords have less pricing power regardless of their own holding costs.

Could these changes affect Brisbane and southeast Queensland differently?

Possibly. Brisbane and southeast Queensland have experienced strong population-driven demand and persistently low vacancy rates in recent years. SQM Research data confirms southeast Queensland has been among the regions with sustained rental price growth. Any reform that reduces rental supply without accompanying supply-side improvement could have a more pronounced effect in this region, while price moderation from reduced investor demand might create slightly more accessible entry conditions for first-home buyers in Brisbane’s investor-heavy suburban markets.

Final Takeaway

The case for reforming Australia’s property investor tax settings is not frivolous. The combination of a generous CGT discount introduced following the 1999 Ralph Review, and fully deductible negative gearing losses has contributed, over two decades, to an investor landscape that favours capital gain over rental yield and has arguably supported prices beyond what fundamentals alone would sustain.

But the evidence does not support a simple story. Rents do not automatically surge when investor tax breaks are cut. Prices do not crash. First-home buyers do not automatically benefit unless price moderation is meaningful and rental conditions remain manageable.

What matters most is design, timing, and what accompanies the reform. The NHSAC’s 2025 report makes clear that Australia’s housing system is already under severe pressure, with supply falling short of demand and affordability at record lows. Blunt, ungrandfathered changes introduced into that environment without supply-side support carry real risks. Gradual, grandfathered reform linked to genuine supply policy is a more defensible and more durable proposition.

Watch for the detail of any formal proposal whether it is grandfathered, whether it applies to new builds or existing properties, and whether supply-side measures are part of the package. The headline change matters far less than the architecture around it.

This article is general information only. It does not constitute financial, tax, or legal advice. Readers should seek independent professional advice before making any investment, financial, or property decisions.