Key takeaways
The CGT “discount” is misnamed and has distorted public debate for decades. It is really a rough adjustment for inflation, not a special tax break.
Before 1999, only real gains were taxed using inflation indexation. The current 50% rule simply approximates that outcome in a simpler way.
The 50% discount broadly aligns with inflation over time, so it is not a windfall. In some cases it even over- or under-compensates, depending on inflation levels.
Arguments about intergenerational equity misdiagnose the issue. Housing affordability is better addressed through supply, not higher taxes on investors.
Treasury “cost” estimates are misleading because they assume taxing nominal gains is appropriate. A more accurate approach would be to return to CPI indexation and tax only real gains.
Every time I hear that property investors are accused of getting a special tax break, I want to point to the language being used and explain why the framing is completely wrong.
The so-called capital gains tax "discount" has been misnamed since the day it was introduced, and that one word has caused 25 years of bad policy debate, political grandstanding, and public resentment toward property investors who are simply playing by the rules.
Let me explain what's really going on.
Back to 1999 - when this all changed
Before 1999, the Australian tax system handled capital gains in a sensible and technically accurate way.
When you sold an asset, the cost base was indexed to inflation so that only your “real gains” were taxed. You weren't penalised for simply keeping pace with rising prices.
Then the Howard government changed things. Post-1999, a 50% CGT "discount" applied to nominal gains as a blunt approximation to allow for inflation.
So instead of precisely calculating the real gain on every property sale, the government said: "We'll assume roughly half of your nominal gain is inflation, and we'll only tax the other half."
That's not a discount. That's an inflation adjustment using a rough average proxy.
The problem is what they called it.
Words matter in politics
Call something a "discount" and you've already lost the argument before it starts.
People hear "discount" and they assume someone is getting a leg up - a special favour, a loophole, a gift from the government to wealthy investors.
The whole debate really comes down to terminology.
A simple remedy would be to return to explicit CPI indexation of the cost base - that would remove both the "discount" rhetoric and any ambiguity around what is being adjusted.
The numbers tell a different story
Former actuary Tony Dillon ran the actual maths on this for Firstlinks, and the results are informative.
Consider a property purchased a year ago that grew in value by 5%, with 2.5% inflation over that period. Under the pre-1999 approach, the real gain would be 2.5% of the purchase price - exactly the same result as a 50% discount applied to the nominal gain of 5%.
So for a one-year hold with moderate inflation, the 50% rule is actually a precise approximation. No windfall. No rort.
It is the inflation rate, more than the holding period, that shifts what discount is truly required to remove inflationary gains.
A change in inflation from 2% to 3% moves the implied fair discount from around 35% to around 55% when an asset is sold after ten years.
In other words, a fixed 50% is a reasonable long-run average, not a generous giveaway.
"Intergenerational equity" is a political argument dressed up as economics
Recently, the phrase "intergenerational equity" has been thrown around when discussing CGT.
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I understand the frustration behind it - younger Australians are genuinely finding it harder to get into the property market. But attributing that to the CGT discount misdiagnoses the problem.
Advocates who call for a reduction in the CGT discount on the grounds of intergenerational equity argue that lowering it increases fairness, when it really moves in the direction of taxing inflation.
Those people ignore the notion that the discount is a crude inflation assumption, and that such an adjustment by design will sometimes result in under-taxing real gains, and sometimes over-taxing.
Taxing people on gains they never really made, simply because prices rose with inflation, is not "fair." It's just the government taking more money from property investors.
Changing the discount rate to address housing affordability would be a misplaced policy - addressing the supply side of housing would be the real way to tackle affordability.
In my mind, increasing tax on something you need more of is counter-intuitive.
What the Treasury figures conveniently leave out
Proponents of cutting the CGT discount love to cite Treasury's Tax Expenditures and Insights Statement, which claimed the 50% discount cost the budget around $19.7 billion in 2024-25.
These claims are misleading because the TEIS uses a benchmark where nominal capital gains are fully taxable when realised - meaning the "revenue foregone" makes no allowance for inflation, and calculated "costs" are significantly overstated.
In any case, not taking more of taxpayers' money is not a "cost" to the budget.
When politicians talk about the "cost" of this discount, they're assuming the government was entitled to tax your inflation-driven gains in full.
That's a very big assumption to slip past people quietly.
What should actually happen
Returning to CPI indexation of the cost base would be the cleaner and more honest solution.
Yes, it's slightly more complex to administer, but it removes the loaded language and the political football entirely.
You'd simply pay tax on the gains you actually made, measured in real terms, nothing more.
Until that happens, investors need to understand that the so-called "discount" is not a favour being done for them.
It's an imperfect but broadly reasonable adjustment for the fact that inflation erodes the real value of money over time, and taxing people on that erosion has never been the right approach.
If you'd like help structuring your property portfolio to be tax-efficient as well as growth-focused, the team at Metropole can help.
We work with investors at every stage to build long-term wealth the right way.
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