The 2026–27 Federal Budget and Property Investment: What's Actually Changed

On 12 May 2026, Treasurer Jim Chalmers handed down the most significant changes to Australian property taxation in over two decades. Two reforms anchor the package: a restriction on negative gearing, and the replacement of the 50% Capital Gains Tax discount.

For Sydney property investors, this changes the maths on almost every strategy. Here’s what’s actually happened, what hasn’t, and where the genuine opportunities sit going forward.

What Changed

1. Negative gearing is limited to new builds — from 1 July 2027

For residential investment properties acquired after 7:30pm AEST on 12 May 2026, negative gearing will only be available where the property is a “new build”. Investors will be able to deduct rental losses against other residential property income, but not against wages or other income, unless the property qualifies as a new build.

Existing residential investment properties — including those under contract but not yet settled at the announcement date — are grandfathered and remain eligible for negative gearing until they are sold.

2. The 50% Capital Gains Tax discount is being replaced

From 1 July 2027, the existing 50% CGT discount on assets held more than 12 months will be replaced with a cost-base indexation system, combined with a minimum tax rate of 30% on net capital gains. The change applies broadly across CGT assets held by individuals, trusts, and partnerships.

For gains crystallised before 1 July 2027, the existing 50% discount continues to apply.

3. Supporting measures

The package also includes:

• A new $2 billion Local Infrastructure Fund to support last-mile infrastructure for new housing
• An extension of the ban on foreign purchases of established dwellings
• Strengthened affordability requirements for the build-to-rent tax concession
• Additional support for social and affordable housing
• A permanent $250 Working Australians Tax Offset from late 2027
• A $1,000 instant tax deduction for work-related expenses from 2026–27 4. What hasn’t changed

The first-home buyer concessions, the Help to Buy scheme, and the existing CGT main residence exemption are all unchanged. Existing investors and owner-occupiers are largely unaffected by the reforms in the short term.

What Counts as a “New Build” — This Is the Critical Detail

The definition of “new build” is the single most important detail in the entire package, because it determines who keeps negative gearing access and who doesn’t.

Based on the public guidance released so far, “new build” includes:

• A newly constructed apartment bought off-the-plan

• A duplex constructed through a knockdown rebuild that replaces a single dwelling with two — i.e. a net increase in the number of residential properties

• Any residential construction on previously vacant land

• A newly built property occupied for less than 12 months before being first sold And critically, “new build” excludes:

• An established property extended to add additional bedrooms

• A free-standing house constructed through a knockdown rebuild (one dwelling replaced by one dwelling — no net increase in supply)

• Established properties purchased after Budget night that have not been newly constructed That distinction — net increase in supply — is the policy lever. The federal government is trying to direct investor capital toward construction that adds to the housing stock, not toward bidding up the existing stock.

What This Means in Practice

For existing investors: Nothing changes in the short term. Properties held at 7:30pm on 12 May 2026 retain their current tax treatment until sale. If you sell after 1 July 2027, the new CGT regime applies to gains crystallised after that date, with a split calculation for the pre- and post-July 2027 periods.

The change creates a “lock-in” effect — existing investors have a strong incentive to hold rather than sell, which is likely to compress secondary-market supply over the medium term.

For investors buying established stock between now and 30 June 2027: A transition window applies. You can still negatively gear an established property fully during this window, but the deductions cease from 1 July 2027 unless the property qualifies as a new build (which an established purchase does not).

For investors buying after 1 July 2027: If the property is not a new build, rental losses can be carried forward against future residential property income but cannot be offset against wages or other income. This significantly reduces the after-tax cashflow benefit of an established investment property — particularly in the early holding years when interest expenses are highest.

For investors building new dwellings: The new-build exemption preserves the existing tax treatment in full. Negative gearing remains available. The 50% CGT discount remains available for sales before 1 July 2027, and the new indexation/30% minimum tax regime applies after that.

The Strategies That Now Make More Sense

1. Dual occupancy via knockdown rebuild

A dual occupancy that replaces a single existing dwelling with two newly constructed dwellings is the textbook example of a “new build” under the federal guidance — there is a net increase in housing supply. This preserves full negative gearing access on the investment dwelling, and the depreciation deductions on a brand-new build are typically the strongest available.

For Sydney investors with development-suitable land — increasingly common given the Stage 1 LMR reforms making dual occupancy permissible in all R2 zones, and Stage 2 LMR reforms allowing dual occupancy at 450m² and 12m width in mapped areas — this is now a structurally more attractive strategy than purchasing an established unit or house.

2. Granny flats and secondary dwellings

A purpose-built secondary dwelling is a new dwelling. The guidance suggests it would qualify as a new build for negative gearing purposes, though the precise drafting of the legislation will need to be checked once introduced. Depreciation on a new granny flat is also strong — Division 43 capital works deductions at 2.5% over 40 years, plus Division 40 plant and equipment deductions.

3. New apartment construction

Off-the-plan apartments retain negative gearing access. This is likely to redirect some investor demand toward genuine new supply, which may support the apartment construction pipeline that has been weak in Sydney for several years.

4. Build-to-rent

The build-to-rent concessions remain in place with strengthened affordability requirements. This is a wholesale rather than retail strategy and isn’t directly accessible to most household investors, but it indicates the policy direction.

The Strategies That Just Got Harder

1. Buying established stock for negative gearing benefit

The traditional Sydney investor strategy — buying an established house or unit, holding it negatively geared while it appreciates, then selling for a capital gain — has been the dominant model for thirty years. From 1 July 2027, the after-tax economics of that strategy change materially.

2. Renovating to add bedrooms

Adding bedrooms to an existing investment property no longer qualifies as a “new build” — the dwelling count hasn’t changed. The renovation may still make sense for rental income and depreciation reasons, but it doesn’t unlock new-build negative gearing access on the property.

3. Single-dwelling knockdown rebuilds

If a knockdown rebuild simply replaces one dwelling with one larger dwelling, there is no net increase in supply, and the “new build” status is lost. To capture the new-build benefit, the rebuild needs to genuinely add at least one additional dwelling — a duplex, attached dual occupancy, or detached dual occupancy.

The Bigger Picture

The federal budget changes need to be read alongside the Stage 1 and Stage 2 Low- and Mid-Rise Housing Policy reforms. Stage 1 (1 July 2024) made dual occupancy permissible in all R2 zones across NSW. Stage 2 (28 February 2025) reduced minimum lot sizes for dual occupancy to 450m² and minimum widths to 12m in mapped LMR areas. The NSW Housing Pattern Book (released progressively from July 2025) provides a fast-tracked CDC pathway for compliant designs.

Together, the federal tax changes and the NSW planning reforms are creating a structural tailwind for investor-led duplex and small-scale multi-dwelling development:

• Easier to approve (LMR + Pattern Book)
• Preserved tax treatment (new build under federal rules)
• Strong depreciation (new construction)
• Increased rental yield (two income streams vs one)
• A long-term policy direction explicitly favouring this kind of supply For Sydney property owners with development-suitable blocks, the question over the next twelve months isn’t whether the regulatory environment has shifted in favour of build-to-add-supply strategies — it’s whether your specific block is now a viable development site, and whether the timing makes sense given the 1 July 2027 transition.

A Note on Legislative Status

These changes were announced in the 2026–27 Federal Budget. They will need to pass the Senate before becoming law, and the final detail of the new-build definition and transitional provisions may shift during the legislative process. The grandfathering provisions for existing investors appear to have broad support, but the negative gearing and CGT changes themselves are politically contested.

We’re tracking the legislative process closely. The strategic implications for development-suitable blocks in Sydney are unlikely to reverse — the policy direction is too clearly set — but the precise commencement dates and definitional edges may move.

Where Plan Land Comes In

For owners weighing development against holding, our feasibility assessments now factor the budget changes directly into the investment case — quantifying the tax efficiency of a new-build dual occupancy against the alternative of acquiring an established investment property under the post-July 2027 rules. The maths has shifted, and in many cases, the shift is significant.

If you’re sitting on a block that might qualify for dual occupancy under the LMR reforms, the next 12–18 months is the strategic window to plan, design, and lodge.

📍 Plan Land — residential building design and feasibility across NSW. planland.com.au/contact

Disclaimer: This article summarises announced policy changes that have not yet been legislated. Final detail will be confirmed through the legislative process. This is general information only and is not tax, financial, or investment advice. Always seek advice from a qualified accountant, financial adviser, and building designer before committing to a property investment or development strategy.