How capital gains discounts quietly reshape wealth distribution

Australia has been running a 50% tax discount on capital gains for individuals and trusts since 1999. In that time it has become one of the largest structural features of the tax system, one that most Australians interact with only indirectly, mostly through the housing market, and almost nobody has been asked to vote on since John Howard introduced it. A Senate committee has now asked the Parliamentary Budget Office to quantify what it actually costs, and who actually benefits. The numbers are striking.

The discount rewards size, not patience

The mechanics are simple enough. Sell an asset you have held for more than twelve months and you pay tax on only half the gain, at your marginal rate. In theory, this rewards patient investment and compensates for inflation eroding real returns over time. In practice, the 50% rate is not calibrated to inflation. It does not vary with how long you held the asset, or with how much of the gain was real versus nominal. It is a flat reduction, applied uniformly, which means it delivers the largest absolute benefit to whoever realises the largest gains, which is to say, people who already have the most assets.

The PBO's distributional analysis sharpens that picture considerably. Breaking down the CGT revenue foregone in 2025-26 by taxable income decile reveals that the benefit concentrates sharply at the upper end. The top percentile of income earners captures a disproportionate share of the total tax expenditure. Treasurer Jim Chalmers made the point directly in June: 0.2% of tax filers earned around 60% of all net capital gains income, while 99% of tax filers earned only 13%. That is not primarily a story about who invests in shares. It is a story about who owns investment property.

When the tax system prices capital gains at half the rate of wage income, it tells a clear story about what kind of wealth creation it values.

Negative gearing turns the discount into a system

Property is where this mechanism does most of its work. The CGT discount interacts with negative gearing in a way that was probably not fully anticipated in 1999. Negative gearing lets investors deduct property losses against their ordinary income, effectively subsidising the carrying cost while they wait for capital appreciation. The CGT discount then halves the tax on the appreciation when it arrives. Together, the two settings create a structure in which the optimal strategy for a high-income earner is to buy leveraged property, run it at a loss, and wait. The after-tax arithmetic works. The social arithmetic is messier.

Since 1999, Australian house prices have risen by more than 400%. There are multiple causes, and attributing a precise share to tax settings is genuinely difficult. But the incentive structure is not difficult. When the tax system prices capital gains at half the rate of wage income, it tells a clear story about what kind of wealth creation it values. The person who earns a dollar and pays tax on it is treated differently to the person who owns an asset that appreciates by a dollar. The first person subsidises the second through the tax expenditure, and typically also through the higher rents and purchase prices that follow from asset-price inflation driven partly by that same expenditure.

Three decades of compounding cost

The cumulative cost is large. The PBO's analysis covers 1999-2000 to 2035-36, a 37-year window. Revenue foregone over that period runs into the hundreds of billions. Each year the discount is maintained is a year in which those resources are not available for public investment, tax relief elsewhere, or deficit reduction. That is a choice the parliament makes by inaction as surely as it would by a vote.

Defenders of the discount make two arguments worth taking seriously. The first is that removing it would reduce investment, particularly in equities. The second is that a rollback would hit ordinary Australians who have invested in property as a retirement strategy in the absence of adequate superannuation. Both have some purchase. The first is contested: Australia's investment performance over the period has not obviously validated the mechanism. The second is real, but it describes a symptom of policy failure, not a reason to preserve the policy that contributed to the failure.

The numbers exist; the political will does not

What the PBO data clarifies is that the CGT discount is not a neutral feature of the landscape. It is an annual decision to direct a very large sum of tax expenditure toward the portion of the population that already holds the most assets. Whether that decision reflects a deliberate view about what the tax system should do, or whether it persists mainly because the beneficiaries are well-organised and the costs are diffuse, is a question Australian policymakers have mostly avoided answering for 27 years. The committee now has the numbers. What they do with them is the actual test.

Sources

Parliamentary Budget Office — Operation of the CGT discount

Frequently Asked Questions

How does Australia's capital gains tax discount work?
If you sell an asset you have held for more than twelve months, you pay tax on only half the capital gain at your marginal income tax rate. The 50% discount is flat — it does not vary with how long you held the asset or how much of the gain was real rather than inflation.

Who benefits most from the CGT discount in Australia?
The benefits are heavily concentrated at the top of the income distribution. Just 0.2% of tax filers earned around 60% of all net capital gains income, while 99% of filers earned only 13%. This reflects who holds the most assets, particularly investment property, not who invests most actively.

How does negative gearing interact with the capital gains tax discount?
Negative gearing allows investors to deduct property losses against ordinary income, subsidising the cost of holding an asset. The CGT discount then halves the tax on the eventual appreciation. Together, the two settings make leveraged property investment — run at a loss and held for price growth — the most tax-advantaged strategy available to high-income earners.

Why hasn't Australia removed the CGT discount if it's so costly?
The beneficiaries are concentrated and well-organised, while the costs are diffuse — paid through higher rents, higher purchase prices, and forgone public revenue spread across the whole population. The discount has persisted for 27 years without parliament being formally asked to vote on it; inaction is itself the annual decision to maintain it.

Would removing the CGT discount hurt ordinary Australians who bought investment property for retirement?
This is a genuine concern, but it describes a problem created by decades of inadequate superannuation policy that pushed people toward property as a retirement vehicle. Preserving a distortionary tax setting to protect people from the consequences of a separate policy failure is not a sustainable answer to either problem.