The negative gearing reforms that passed into law after the 12 May 2026 Federal Budget did something no previous policy shift has done: they split residential investment property into two classes with fundamentally different after-tax economics. From 1 July 2027, new builds retain full negative gearing and a choice of CGT treatment. Established properties do not.
That split has changed what buyer’s agents do. Previously, the job was finding the best property regardless of age or type. Now, a buyer’s agent working in the post-reform market has to first determine which properties qualify for full tax treatment before evaluating location, build quality, and yield. Every buyer’s agent in Australia is now, whether they frame it this way or not, a buyers agent new builds negative gearing specialist.
The question for investors is whether this pivot genuinely serves them, or whether it just narrows the field to properties that happen to carry higher commissions.
What Actually Changed on 12 May 2026
On budget night at 7:30pm AEST, the Government announced reforms to negative gearing and capital gains tax. These measures are now law.
Two changes matter most for investors:
- Negative gearing for residential property is limited to new builds from 1 July 2027.
- The 50% CGT discount is replaced with cost-base indexation and a 30% minimum tax rate on capital gains.
Properties owned or under binding contract at the time of the announcement are grandfathered. Existing investors keep full negative gearing on those properties until sale. The CGT reforms apply only to gains that accrue after 1 July 2027.
Superannuation funds (including SMSFs) and widely held trusts such as Managed Investment Trusts are excluded from the measures entirely.
The intent is explicit: reduce investor demand for existing housing stock while preserving tax support for investment in new supply. For a deeper breakdown, see our negative gearing changes 2026 guide.
What ‘Quarantined Losses’ Mean for Established Property Investors
Under the old system, if your investment property ran at a loss (mortgage interest and expenses exceeding rent), that loss reduced your taxable salary income. A $10,000 rental loss on a $120,000 salary meant you were taxed on $110,000.
That mechanism is gone for established properties purchased after the cut-off. Rental losses are now “quarantined”. They can only offset future rental income or the capital gain when you eventually sell. They cannot offset salary or other income.
In cash-flow terms, CBA estimates the removal of negative gearing on established properties is equivalent to a 90 to 155 basis point increase in investor mortgage rates. That is a significant hit to holding costs for any negatively geared property.
A transitional rule applies: established properties purchased after the announcement may still be negatively geared until 30 June 2027, after which deductions are denied.
Why New Builds Now Hold a Structural Tax Advantage
New builds retain access to both negative gearing and the current 50% CGT discount. On top of that, new build investors get a choice at sale: apply either the 50% CGT discount or the new indexation method with a 30% minimum tax, whichever produces a better outcome.
This is not a loophole. The Government explicitly designed the reform to redirect investor capital toward increasing housing supply.
The result is a two-tier market. A new build and an established property in the same suburb, at the same price, with the same rent, now produce materially different after-tax returns. That gap did not exist before May 2026.
What Counts as a ‘New Build’ Under the Law
This is where many investors get it wrong. Pitcher Partners’ analysis of the budget measures provides a specific table of what qualifies and what does not.
| Scenario | Qualifies? |
|---|---|
| Newly constructed apartment bought off-the-plan | Yes |
| Duplex constructed through a knock-down rebuild replacing a single free-standing house | Yes |
| Free-standing house constructed through a knock-down rebuild replacing an older, smaller house | Yes |
| Any residential construction on previously vacant land | Yes |
| Newly built property occupied for less than 12 months before first sale | Yes |
| Established property recently extended to add bedrooms | No |
| Granny flat built adjacent to an established property | No |
| Newly built property occupied for more than 12 months before sale to a subsequent investor | No |
The 12-month occupancy threshold is a trap for anyone buying “near-new” stock. A property that was completed 14 months ago and lived in by the developer’s family does not qualify. Neither does extending your existing three-bedroom house into a five-bedroom and converting it to a rental.
For investors weighing the broader case for new build investment property, the qualification rules are now the first filter, not the last.
The CGT Picture for New Build Investors
The replacement of the 50% CGT discount with cost-base indexation is not automatically worse. When house prices rise only modestly above inflation, indexation can actually produce a better result.
CBA’s analysis puts the break-even point at around 4.5 to 5% annual price growth, depending on holding period. With a 10-year hold and inflation at 2.5%, indexation matches the old 50% discount at roughly 4.8% annual growth. Below that, indexation is more favourable.
New build investors have the advantage of choice. They can opt for whichever method produces a lower tax bill at the point of sale. Established property investors (those who bought after the cut-off) get indexation only, with the 30% minimum tax rate applying regardless.
The Lock-In Effect and What It Means for the Market
Grandfathered investors now have a stronger incentive to hold rather than sell. Selling a grandfathered property means losing its negative gearing treatment permanently. Buying a replacement established property means quarantined losses. The rational move is to hold.
That creates a lock-in effect. If investors delay selling for tax reasons, the supply of established homes available for purchase tightens, which could push established home prices upward even as investor demand softens.
CBA expects the reforms to push house prices about 3% lower than they otherwise would have been overall, with its dwelling price growth forecast for 2026 revised down to 3% from 5%. On the supply side, the budget includes a $2 billion Local Infrastructure Fund to support last-mile infrastructure for new housing developments.
Why a Buyer’s Agent Matters More Now (and Where PropSpotter Fits)
The reform created genuine complexity. A buyer’s agent experienced in post-reform new builds needs to assess whether a specific development qualifies under the legislation, whether the rental yield stacks up against construction costs, and whether the location holds up on its own fundamentals rather than relying on the tax treatment to make the numbers work.
Under the new rules, residential property income is assessed on an aggregate basis. Losses from one property can offset gains from another in the same portfolio. For investors building a mixed portfolio of grandfathered and new properties, that aggregate treatment creates planning opportunities, but also the kind of structural complexity that most investors have never had to navigate.
The risk is paying for guidance you could build yourself. PropSpotter sits in this gap: suburb research, listing alerts, and personal coaching that help you evaluate new builds on their fundamentals, not just their tax classification. You learn to run the qualification checks, model the yield, and assess build quality, keeping the process (and the savings) in your own hands. More on that approach in our buyer’s agent alternative guide.
What to Look for in New Builds Now
The tax advantage makes new builds more attractive. It does not make every new build a good investment. Construction costs remain high, and the tax exemption can mask poor fundamentals.
Before committing, work through these filters in order:
- Does it qualify? Check the development against the qualification table above. Off-the-plan apartments and genuine knock-down-rebuilds qualify. Extended established homes and granny flats do not.
- Does the yield work without the tax offset? If the property only makes sense because negative gearing subsidises the loss, it is a tax play, not an investment. Run the numbers assuming no offset against salary income.
- Location fundamentals. Population growth, employment base, infrastructure spending. These determine long-term capital growth regardless of tax treatment.
- Build quality vs developer margin. Developer margins on new builds are higher than on established stock. Inspect comparable builds by the same developer. Check defect histories.
- Developer track record. A qualified new build from a developer who delivers late, over budget, or with defect-riddled builds will cost more than the tax benefit saves.
The Grandfathering Advantage
Investors who owned or had a binding contract on residential property at 7:30pm AEST on 12 May 2026 sit in a structurally stronger position than anyone entering the market now. Their existing portfolio retains full negative gearing. And as those properties become positively geared over time (as mortgages reduce and rents rise), the new rules allow them to use excess profit from their old portfolio to immediately absorb quarantined losses from newly acquired properties.
There is also a potential pathway for current owner-occupiers. Under the legislation, a property only needed to be owned or under binding contract at the cut-off time to be eligible for the old negative gearing treatment. It did not need to be an investment property at that time. An owner-occupier who buys a new home in the future and converts their current residence to a rental could potentially access the traditional treatment on that former home.
This is worth discussing with a tax adviser before acting on. The ATO’s interpretation of this provision may narrow over time.
FAQ
Can I still negatively gear an established investment property?
Only if you owned it or had a binding contract at 7:30pm AEST on 12 May 2026. Those properties are grandfathered. Established properties purchased after the cut-off can be negatively geared until 30 June 2027, after which losses are quarantined and can only offset rental income or capital gains.
Do buyer’s agents only recommend new builds now?
Many are pivoting toward new builds because of the structural tax advantage. But a good buyer’s agent should still evaluate the investment on its fundamentals. A new build in a poor location with weak rental demand is not a good investment regardless of its tax treatment.
What CGT treatment applies to new builds?
New build investors can choose between the traditional 50% CGT discount or the new cost-base indexation with a 30% minimum tax rate. The break-even point is around 4.5 to 5% annual price growth. Below that, indexation tends to be more favourable.
Does this apply to SMSF property?
No. Superannuation funds, including SMSFs, are excluded from the negative gearing changes entirely.