Ask a renter in outer Brisbane or western Sydney what would actually fix their situation, and the answer is rarely an economics lecture. It is simpler: a landlord who does not lift the rent by hundreds of dollars at the next lease renewal, and a market that does not force a family to change suburbs, schools and jobs because the rent on the home they already live in has run away from what they earn. That renter has spent this decade watching advertised rents climb faster than wages, watching rental vacancy rates fall to some of the lowest levels on record, and watching a government promise a supply-side fix — more homes, eventually — that keeps arriving late and short of its own targets.
Into that gap steps the Greens' housing platform: freeze rent increases, then cap them; strip back the tax settings that favour property investors over first-home buyers; and stand up a public developer to build homes the private market is not building fast enough. It is popular for a reason — it promises relief now, not in five years. But the same evidence-first method this site applies to every other policy it examines points to an uncomfortable conclusion for a policy renters understandably want to believe in: the economic literature on rent control is about as close to settled as economics gets, and it says binding price controls on rent shrink the rental housing stock over time, hurting the next renter in line even as they protect the renter already inside. The tax and public-developer planks rest on firmer, if still contested, ground. This article works through all three, on the evidence, not the politics.
What the Greens propose
The most attention-grabbing plank is a national rent freeze, followed by an ongoing cap. In successive election platforms since 2022, the Greens have proposed a temporary, nationwide freeze on rent increases — locking existing rents in place for a fixed period — followed by a permanent cap limiting how often and how much a landlord can raise the rent afterwards, in some versions of the policy limited to no more than once every two years and tied to a modest fixed benchmark (The Australian Greens, published housing policy statements, 2022–2025, approx.). The party does not control this lever directly: residential tenancy law is a state and territory responsibility, so the federal Greens' route to a national freeze runs through using their Senate leverage — documented in this site's coverage of the Greens' balance-of-power role — to make Commonwealth housing funding conditional on the states adopting rent-control measures, rather than legislating a freeze themselves.
The second plank targets the tax settings that shape who buys housing. Negative gearing lets an investor who spends more on a rental property's mortgage interest, maintenance and other costs than they earn in rent claim that shortfall — the "loss" — as a deduction against their other income, such as salary, cutting their tax bill (Australian Taxation Office, Taxation Statistics, approx.). The capital gains tax discount, introduced in 1999, lets an investor who holds an asset for more than twelve months pay tax on only half of any gain when they sell it. The Greens propose phasing out negative gearing for future property purchases — grandfathering existing arrangements — while limiting the concession to one investment property, and reducing or abolishing the capital gains tax discount on investment property, arguing the combination subsidises investors bidding against first-home buyers for the same modest, established homes (The Australian Greens, tax and housing policy statements, approx.).
The third plank is the most structurally ambitious: a publicly owned property developer, sitting alongside or beyond the existing Housing Australia Future Fund examined elsewhere on this site, that would build homes directly rather than fund private developers or investors to build them. In the Greens' framing, a public developer removes the profit margin, land-banking incentive and "build only what sells at the highest margin" logic that shapes private-sector supply decisions, and can build homes to rent or sell below market rate at a scale the party argues neither the private market nor the HAFF's investment-return model can match (The Australian Greens, "A Home for All" and related housing platform statements, approx.). The party has costed the proposal, in various forms, against new or increased taxes on large corporations and the largest individual wealth holders — costings that have not, at the time of writing, been independently verified by the Parliamentary Budget Office against a single, final policy design in the way the government's own housing measures have been (Parliamentary Budget Office, approx.).
The strongest case for the policy
Renters are in genuine distress now, and a decade of price signals hasn't fixed it
Put the Greens' case at its best, and it starts from a fact this site documents in detail elsewhere: renters are in genuine distress now. Advertised rents have risen roughly 30 to 40 per cent nationally since their pandemic-era trough (approx.), rental vacancy rates have fallen to some of the lowest levels on record, and that pressure has landed hardest on the households with the least capacity to absorb it — people who cannot simply outbid a rival tenant or move to a cheaper suburb without giving up a job, a child's school, or a support network. For a family in that position, a promised supply-side fix that arrives, if at all, years from now is not an answer to a rent increase due in six weeks.
The Greens' deeper argument is that the country has already run the "trust the market" experiment for a decade, and it has failed the people currently renting. Successive governments of both major parties have relied on the promise that more supply, eventually, would bring rents down — yet completions have consistently run behind population growth and behind the government's own Housing Accord targets, documented in this site's housing-affordability coverage. If price signals alone worked, the Greens argue, a decade of record rents should already have called forth enough new rental supply to bring rents back down; it has not. On that reading, a price control is not offered as an alternative to supply-side reform — it is a stopgap for the renters who cannot wait for supply-side reform to work, deployed precisely because the supply side has been too slow.
The tax-reform plank has the most independent economic support of the three. Grattan Institute modelling and mainstream tax economists broadly agree that negative gearing and the capital gains tax discount tilt the system toward investors and away from first-home buyers, and that winding them back would be a fairer, more efficient use of the tax system than the status quo (Grattan Institute, approx.). And the public-developer plank has a real historical precedent: Commonwealth and state governments built several hundred thousand public and community homes at scale in the decades after the Second World War under the Commonwealth-State Housing Agreement, at a pace this article's evidence section shows the private market and the current Housing Australia Future Fund have not matched since (approx.). A reasonable person can conclude that if government built housing at scale before, it can do so again — and that renters facing a crisis now have a legitimate claim on relief that does not wait for the market to clear.
The evidence
Start with the distress that makes the rent-freeze plank popular, because it is real and well documented. Advertised rents nationally rose by roughly 30 to 40 per cent between their pandemic-era trough in 2020-21 and 2025 (approx.), against a headline Consumer Price Index rise of a little over 20 per cent over the same period (approx.) and wage growth, measured by the Wage Price Index, that ran behind both for most of that stretch (ABS Consumer Price Index; ABS Wage Price Index, approx.). National rental vacancy rates, tracked independently by several data providers, fell to around 1 per cent or below in the tightest capital-city markets through 2023-24 — a level industry bodies typically describe as an extreme shortage, well under the 2-3 per cent range associated with a healthy, balanced rental market (SQM Research; Domain Rental Report, approx.).
That distress is real. What the literature disputes is whether a rent freeze or a binding rent cap — a legal limit on how much or how often a landlord can raise the rent, sometimes called rent control — is the remedy, or whether it deepens the shortage that caused the distress in the first place. This is one of the most heavily studied questions in applied economics, across dozens of cities and several decades, and the empirical findings point overwhelmingly the same direction. When the University of Chicago's IGM Forum surveyed a panel of senior American academic economists, spanning the political spectrum, on whether rent ceilings had a positive effect on the quantity and quality of affordable rental housing in the cities that adopted them, roughly 93 per cent disagreed or strongly disagreed, and essentially none agreed (IGM Forum, "Rent Control" expert panel, 2012, approx.) — one of the largest points of consensus the panel has recorded on any policy question it has surveyed.
The most detailed empirical case study is San Francisco's. Economists Rebecca Diamond, Timothy McQuade and Franklin Qian tracked what happened after a 1994 ballot initiative extended the city's rent-control rules to small multi-family buildings previously exempt. Comparing landlords whose buildings became rent-controlled to otherwise similar landlords whose buildings did not, they found rent control caused a large share of affected landlords to convert their buildings out of the rental market altogether — selling units as owner-occupied condominiums, converting them to tenancy-in-common ownership, or redeveloping the site — reducing the rental housing supply provided by treated buildings by roughly 15 per cent relative to the comparison group over the following two decades (Diamond, McQuade and Qian, American Economic Review, 2019, approx.). The renters who stayed in their rent-controlled apartments benefited substantially — the study estimates it saved existing tenants a meaningful share of what they would otherwise have paid, and made them less likely to move. But the city-wide effect of fewer rental units on the market, the authors found, was to push up market rents for everyone else by an estimated 5 per cent or more citywide (approx.) — a transfer from future renters, and from renters not lucky enough to hold a rent-controlled lease, to the renters already inside the system.
San Francisco is not an outlier finding. When Massachusetts voters ended rent control in Cambridge, Boston and Brookline by statewide referendum in 1994, economists David Autor, Christopher Palmer and Parag Pathak later found that removing the controls triggered a wave of renovation and reinvestment in the previously rent-controlled buildings, lifting their value by a large margin relative to comparable buildings that had never been controlled — and that the effect spilled over into higher property values on nearby, never-controlled properties too, consistent with rent control having suppressed investment in the surrounding area while it was in force (Autor, Palmer and Pathak, Journal of Political Economy, 2014, approx.). And in cities that ration a fixed, controlled-rent housing stock through a waiting list rather than a market price — Stockholm's public rental queue is the most cited example — the wait for a first-hand contract in the inner city has stretched past nine years on average, and considerably longer in the most sought-after neighbourhoods, because a rent held well below the market-clearing level generates chronic excess demand that a fixed stock of controlled apartments cannot satisfy (Stockholm Housing Agency, Bostadsförmedlingen, queue-time data, approx.).
Germany offers the most direct test of a rent cap that resembles the Greens' softer proposals rather than a hard freeze. Its 2015 "Mietpreisbremse," or rent brake, limits how much a landlord can raise rent within an existing tenancy in designated high-pressure markets, while deliberately exempting new-build housing so as not to discourage construction. Studies by German economic research institutes, including DIW Berlin, found the rent brake slowed the pace of rent increases in existing tenancies by a modest amount, but had little measurable effect on new dwelling completions — because new supply was carved out of the policy from the start — while also documenting landlords using workarounds, such as short-term furnished leases that fall outside the cap, to route around it (DIW Berlin; German rent-control research, approx.). Germany's experience suggests the softer, exemption-heavy version of rent control the Greens have gestured toward in later policy iterations does less damage to supply than a hard freeze, largely because it avoids applying to the one thing a shortage-hit market most needs — new construction. The trade-off is that a policy careful enough to avoid the worst supply effects is also narrower than the single fix its advocates sometimes present it as.
Australia has, so far, mostly avoided binding rent control at the state or federal level, and the debate over the Greens' proposal has already played out once, in miniature, inside the negotiation that produced the Housing Australia Future Fund. During that 2023 stand-off, examined in more depth in this site's coverage of the Greens' Senate leverage, Greens senators and several housing advocates pushed for National Cabinet to adopt a national rent freeze or a binding cap as a condition of new Commonwealth housing funding; National Cabinet's August 2023 communiqué instead settled on a more limited commitment — for jurisdictions to work toward "a nationally consistent framework" for rental laws, including modest tenancy protections such as limiting rent increases to once a year, well short of a freeze or a hard cap (National Cabinet communiqué, Aug-2023, approx.). The Australian Capital Territory runs the closest thing to a rent-control regime in the country today: a rent increase above a threshold linked to the rents component of the Consumer Price Index gives the tenant a right to apply to the ACT Civil and Administrative Tribunal to have the increase reviewed as excessive, rather than an outright ban on increases above that level (ACT Residential Tenancies Act 1997, as amended, approx.). It is a softer, review-based model than the Greens' national proposal, and Canberra's own rental vacancy rate — among the tightest of any capital over the same period — means it has not, on the evidence available, provided a clean test of what a harder national cap would do (approx.).
The economists' near-consensus on rent control is not that renters do not need help. It is that a legal ceiling on price is a poor tool for adding the one thing a shortage actually needs — more homes.
The tax-reform plank rests on a genuine, well-documented distributional feature of the current system. Australian Taxation Office data shows well over a million individual taxpayers claim a net rental loss in a typical year — the definition of being negatively geared — and the benefit is skewed toward higher-income taxpayers, who gain more from a deduction against a higher marginal tax rate (ATO Taxation Statistics, approx.). Treasury's own Tax Expenditures and Insights Statement puts the combined annual cost to the Commonwealth budget of negative-gearing deductions and the capital gains tax discount on residential property at well over $10 billion a year in revenue not collected (approx.) — money that, on a straightforward reading, could instead fund social housing, other tax relief, or reduced government borrowing. Grattan Institute modelling dating back to 2016 estimated that removing the capital gains tax discount and restricting negative gearing to new housing only would raise government revenue by several billion dollars a year and reduce house prices by a modest amount — Grattan's own central estimate at the time sat in the low single digits of a per cent, not a double-digit correction (Grattan Institute, "Hot Property," 2016, approx.).
That last point cuts against the supply case for negative gearing as it currently operates, but it also limits how much abolishing it would help. Data from the Australian Taxation Office and the Housing Industry Association consistently shows the large majority of negatively geared investment-property purchases — commonly cited at somewhere north of nine in ten — are for established, existing dwellings, not new construction (approx.). An investor buying an established three-bedroom house does not add a single dwelling to the national stock; they simply become the owner instead of a first-home buyer or another investor. If negative gearing is mostly subsidising a transfer of existing homes between owners rather than the construction of new ones, the tax break's contribution to net housing supply has likely been overstated by its defenders — and the Greens' proposal to wind it back is correspondingly less likely to shrink supply by removing it, because it was not adding much net supply in the first place. That cuts toward the Greens' tax reform being lower-risk than the rent-freeze plank, not risk-free.
The public-developer plank is the hardest of the three to evaluate on hard numbers, because it is the newest and least specified in the party's public costings. The Greens have pointed to the post-war Commonwealth-State Housing Agreement, under which Commonwealth and state governments built several hundred thousand public homes across the 1945-1975 period (approx., historical housing-policy literature), as proof that direct public construction can work at national scale when a government commits to it. The closer contemporary comparison is state-owned developer bodies that already exist — Landcom in New South Wales, DevelopmentWA in Western Australia and equivalents in other states — which build and manage housing and land developments today, but at a fraction of the scale the Greens' national proposal implies, and within the same construction-sector capacity constraints documented in this site's coverage of housing affordability: a shortage of tradespeople, and rising materials costs (approx.). Whether a new, larger, national public developer could scale past those constraints faster than the private sector, or would run into the same land-supply, planning-approval and skilled-labour bottlenecks that have slowed the Housing Australia Future Fund and the National Housing Accord, is an open empirical question the Greens' own published material does not yet resolve with a costed, milestone-based delivery plan.
The critique
Put the three planks together and the risk in this policy is not evenly distributed. The rent-freeze and rent-cap plank carries the clearest, best-evidenced downside, because it operates on the supply side directly and immediately, in a market this site's other housing coverage shows is already short by a wide margin. A landlord facing a legal ceiling on what they can charge, and limits on how often they can adjust it, responds to the same incentives San Francisco's landlords did: exit the rental market by selling to an owner-occupier, convert the property to short-stay accommodation not covered by the same tenancy rules, defer maintenance because the rent no longer covers the cost of keeping the property in good repair, or simply not build the next rental property at all and put the capital elsewhere. None of those responses require bad faith on the landlord's part — they are the ordinary, predictable reaction of a market participant facing a price they no longer control, and the empirical record above shows they show up reliably wherever a binding rent control has been studied in detail.
That risk lands hardest precisely where the housing shortage is already worst. This site's coverage of housing affordability and rental stress documents a national dwelling shortfall running into the hundreds of thousands of homes against the government's own Housing Accord target, and a rental vacancy rate already near record lows. Layering a rent freeze onto that market does not create new supply to meet the shortfall; at best it holds today's rents flat for today's tenants while doing nothing to add the next home, and at worst — on the weight of the international evidence — it accelerates landlords exiting the rental pool, shrinking the very stock of rental homes the shortage-hit renters need. A policy sold as protection for renters in distress risks becoming, over several years rather than several months, a mechanism that reduces how many rental homes exist for the next renter in line — precisely the self-defeating tail this article's summary flags.
A rent freeze can hold today's rent flat for today's tenant. It does nothing to build the next home — and on the international evidence, it makes a landlord less likely to keep offering the one they already have.
The negative-gearing and capital-gains-tax plank carries a smaller, more contested version of the same risk, running in the opposite direction to the rent freeze. If phasing out negative gearing and cutting the capital gains tax discount makes investment property less attractive relative to other assets, some existing landlords could choose to sell rather than keep renting the property out — and because a large share of that stock is established housing, a wave of investor selling could shift homes out of the rental pool and into owner-occupation, tightening rental supply even as it makes home ownership marginally more attainable for the buyer who purchases that particular home (Grattan Institute; RBA housing-market commentary, approx.). Whether that trade-off nets out as a win for renters as a group depends on how many investors actually sell, versus simply accept a lower after-tax return and keep renting the property out — a behavioural question the modelling to date has not resolved with precision. Grattan's own 2016 estimate of the price effect was modest, and the rental-supply effect smaller still, but "modest and uncertain" is a different claim to the one the Greens' campaign material sometimes implies.
The public-developer plank's principal risk is delivery, not design. This site's coverage of the Housing Australia Future Fund shows a Commonwealth housing vehicle that, even backed by a specific capital base and a legislated funding floor, is on track to deliver only a small fraction of the homes the government's own Housing Accord says the country needs, constrained by the same planning approvals, land supply and skilled-trades shortages that slow every builder in the market, public or private. A new public developer would need to solve the same three constraints — approvals, land and labour — that have already slowed the government's existing housing vehicles, and the Greens' published material has not yet set out, in the kind of costed, milestone-by-milestone detail this site expects of a multi-billion-dollar program elsewhere, how a new public entity would clear those constraints faster than the funds and agencies that already exist and are already behind schedule.
There is also a distributional risk inside the rent-freeze plank that its own advocates rarely emphasise: a freeze protects the renter who already holds a lease at the moment it takes effect, and does little or nothing for the renter still searching for their first place, or the renter who needs to move for a new job, a larger family or a relationship breakdown. The San Francisco evidence above shows this is not hypothetical: rent control widened the gap between insiders — tenants lucky enough to hold a controlled lease — and outsiders — everyone else competing for the shrinking pool of uncontrolled or newly available rentals, who ultimately paid higher market rents as a result. A policy framed as help for "renters" as a single group can, in practice, help one part of that group at the expense of another.
What they got right — and the honest caveats
Credit is due first on the diagnosis, separate from the prescription. The Greens are right that renters are in real distress, right that the shortage has been years in the making, and right that successive governments' preferred remedy — more supply, eventually — has consistently under-delivered against its own targets, a pattern this site documents in detail in its housing-affordability coverage. A decade of "wait for supply" has not, on the evidence, worked fast enough for the renters living through it, and a party arguing that renters need relief that does not depend on a construction pipeline clearing a backlog by the early 2030s is arguing from a real and well-evidenced failure of the status quo, not an imagined one.
The tax-reform plank is also the best-supported of the three by independent economic analysis. Grattan Institute, and mainstream tax economists more broadly, have argued for over a decade that negative gearing and the capital gains tax discount distort the tax system in ways that favour asset-rich investors over first-home buyers, cost the budget a meaningful sum in revenue forgone every year, and do relatively little to add new housing supply given how much of the deduction flows to established dwellings rather than new builds (Grattan Institute, approx.). Reasonable economists disagree about the scale of the price effect from reform, but relatively few dispute the underlying fairness and revenue case — a different and stronger position than the rent-freeze plank occupies in the literature.
The public-developer plank, whatever its execution risk, is not a fringe idea invented for a press release. Governments in Australia and comparable countries built social and public housing directly and at real scale for much of the twentieth century, and Vienna's city-owned housing stock — still housing a substantial share of that city's population at below-market rent today — is regularly cited internationally, including by housing economists who are otherwise sceptical of rent control, as evidence that a sufficiently large, sufficiently well-run public developer can be part of a genuine supply-side answer rather than only a demand-side one (approx., international housing-policy literature). The honest caveat is that Vienna built that stock over the better part of a century, under planning and financing settings substantially different to Australia's, and no Australian jurisdiction, state or federal, has yet demonstrated it can build at the pace the Greens' proposal would require inside a single decade.
It is also fair to note that not all rent-stabilisation designs are equally damaging in the literature, and the Greens' own policy has shifted between election cycles toward softer versions — a capped rate of increase tied to inflation, reviewable through a tribunal, closer to the ACT's model than to a hard freeze with no escape valve. The empirical case against rent control is strongest against hard, binding caps set well below the market rate and held there indefinitely; it is weaker, though still generally unfavourable to supply, against milder measures that slow the pace or predictability of increases without freezing them in real terms. Which version of the policy would actually be implemented, if the Greens ever held the balance of power required to force it through National Cabinet, remains genuinely unresolved — a caveat that cuts in the policy's favour more than the rent-freeze headline alone suggests.
The risk to the future
Solving today's rent shock by shrinking tomorrow's rental stock
Run the strongest, most binding version of the Greens' rent-freeze and rent-cap policy forward, against the weight of the international evidence in this article, and the risk is not a hypothetical inconvenience — it is the shortage the policy was designed to fix, made worse by the policy itself. If a meaningful share of Australia's rental properties respond to a binding freeze the way San Francisco's landlords did — exiting to owner-occupied sale, short-stay conversion or deferred investment — the country's rental stock shrinks at the exact moment its housing shortage is already measured in the hundreds of thousands of homes. The renters who benefit are disproportionately those who already hold a lease when the freeze begins; the renters who bear the cost are disproportionately the ones not yet housed — younger Australians, new arrivals, people moving for work — who compete for a smaller pool of available rentals at whatever the market will bear once the freeze lifts or once new tenancies, outside its protection, absorb the shortfall.
The tax and public-developer planks carry a different, more manageable version of the same risk: not that they actively shrink supply the way a binding price ceiling does, but that they are asked, in the Greens' own campaign framing, to do more supply-side work than the evidence shows they are likely to deliver. Negative-gearing and capital-gains-tax reform is a stronger fairness and revenue measure than a supply measure; a new public developer is a genuine supply lever in principle but an unproven one in Australian practice, launched into the same planning, land and construction-capacity constraints that have already slowed the government's existing housing vehicles. If either is oversold to the public as a fast fix for the rental shortage, the same disappointment now attaching to the Housing Accord's missed run-rate risks attaching to whatever comes next.
The forward-looking stake is not whether renters deserve relief — this article's evidence section shows plainly that they do, now, not eventually. It is whether the country responds to a housing shortage with policies that add homes, or with policies that redistribute an already-too-small stock of homes more favourably to whoever holds the lease on the day the policy starts. A generation of renters watching this debate has a direct stake in which of those two paths a future government, minority government or balance-of-power negotiation actually takes: one path narrows the shortage over time; the other, on the weight of the evidence gathered from every city that has tried it, tends to widen it.