New build vs established used to be a debate about depreciation and tenant appeal. The 2026 Budget turned it into a tax cliff: from 1 July 2027, a new build you buy today keeps full negative gearing and a choice of CGT treatments, while an established purchase loses the salary offset entirely. Every project marketer in the country is now selling that difference. Here is what the carve-out is worth, what you give up to get it, and the problem nobody selling house-and-land mentions.
What the tax break is worth
The tax gap is real money, so credit where it is due. Take an investor on a $120,000 salary running a $15,000 first-year loss.
On a new build, that loss comes off salary at a 32% marginal rate including Medicare: about $4,800 back at tax time, every negatively geared year. On an established purchase made after 12 May 2026, the same loss is quarantined from 1 July 2027: it pools against other residential property income and comes back later, deferred rather than destroyed, but it is not in your pocket this year.
Depreciation stacks on top. A brand-new dwelling claims both the building structure and every fixture inside it. BMT’s published average for brand-new properties was $15,363 in first-full-year deductions back in FY2021-22, and its current all-residential average still runs above $12,000. An established house bought today claims far less, because the 2017 rules block plant-and-equipment deductions on second-hand assets.
At sale, the new build picks whichever CGT regime is kinder: the old 50% discount or indexation. The established buyer gets indexation with a 30% floor, no choice.
Add it up and the new build’s tax ledger can run $8,000 to $10,000 a year ahead in the early years. If tax treatment were the whole decision, the carve-out would win. It isn’t, for three reasons.
”New build” has no legal definition
The first reason is that nobody can currently tell you, as a matter of law, what a “new build” is.
The Act that passed in June left “new residential dwelling” undefined. It was meant to be settled by a ministerial instrument, but on 18 June the government announced the definition will instead go into a future tranche of primary legislation, with final details “subject to consultation”. Draft guidance is expected to start emerging from late July 2026. Until that process finishes, everything is Budget-paper guidance, not law.
The guidance notes point one way: dwellings on previously vacant land and demolish-and-rebuilds that add to the housing stock are expected to qualify; one-for-one knockdown rebuilds, substantial renovations and granny flats are expected not to. Status is also expected to attach to the first purchaser only.
All of that is expectation, not law. Anyone signing a contract today specifically to capture the concession is buying a tax outcome that has not been written yet. If a marketer tells you a particular product “qualifies”, ask them to show you the legislation. They can’t, because there isn’t any.
What you pay for the tax break
The second reason is the purchase itself. A new build is priced at land plus construction plus the developer’s and builder’s margin, which means you buy at or above replacement cost by definition. Established houses in the same growth corridors routinely trade below it, 9% to 38% below lot-plus-build in the corridors we work. The tax break is a discount on your tax bill; the established house is a discount on the asset.
The gap shows up at the bank first. Lenders value new stock against comparable resales, not against your contract price, and when those disagree it is the valuation that wins. In the last soft cycle, CoreLogic settlement data to June 2019 showed 62% of Sydney off-the-plan units valuing below their contract price at settlement. That is what buying someone else’s margin looks like when the market stops absorbing it.
Then there’s time. A detached build currently averages roughly 11 to 13 months from approval to completion, 35% to 40% longer than a decade ago on Master Builders’ analysis of ABS data. That is a year of interest on the land with no rent against it, while an established purchase collects from the first week after settlement. Construction risk has eased but not vanished: ASIC’s July release counted 3,435 construction insolvencies in FY2025-26, the first annual fall in five years, but construction remains the largest single industry in the insolvency statistics at roughly a quarter of all failures.
What the growth actually did
Costs and tax are only half of it. The other half is what happens to the value after you buy, and here the estate corridors have a record worth reading before you sign.
In Melbourne’s outer west, Fraser Rise houses went backwards over the year to April 2026, down 1.1% to a $692,000 median, while established Melton up the road rose 14.8%. Herron Todd White’s valuers flagged the reason back in March 2023, describing an “oversupply of new housing with the development of multiple new estates throughout Tarneit, Truganina, Deanside and Fraser Rise”. Buyers who paid new-build prices in those estates three years ago have spent that time waiting for the market to catch up to what they paid.
Western Sydney tells a softer version of the same story. Marsden Park did grow, up 6.6% to a $1.23 million median, so this is underperformance rather than a flat line. But established St Marys, in the same corridor at a similar price point, did 20.2% over the same year. Three times the growth, on older stock, at a lower entry price.
Two honest caveats. These are not identical dwellings: estate houses are newer and larger, which is part of why their medians sit higher. And this pattern is regional, not universal. In south-east Queensland right now the greenfield estates are running hot, with Yarrabilba up 21.3% over the same period, ahead of plenty of established suburbs. Anyone telling you new estates never grow is overselling it.
What travels across all of those markets is the entry price. When you buy new, the developer’s margin and the builder’s margin are inside your purchase price, so the first few years of growth go to catching up with what you already paid. Buy established below replacement cost and there is no margin to grow through. That is the difference between waiting for the market to validate your price and starting from a position the market already supports.
When a new build stacks up
There are cases where the answer genuinely can be new. A build on a full-sized block in a corridor where established stock already trades at replacement cost gives up little on price, and Perth is currently close to that description. A buyer who will hold for decades, as the first purchaser, captures the concession for the entire hold. And a portfolio already heavy with quarantined losses has more use for a full salary offset than one starting fresh.
What those cases have in common is that the asset stacks up first, and the tax treatment arrives as a bonus. That is the test. Run the property through the same filters as any other purchase, land content, price against comparables, yield, vacancy, and only then let the concession break a tie. A purchase that only works because of the tax treatment is not an investment, it is a bet on legislation that has not been drafted.
New build vs established, compared
The left column is a genuine tax advantage sitting on top of an asset priced at replacement plus margin, with eligibility rules still being written. The right column pays more tax and buys the same suburb at a discount, with nothing left to define. We keep buying established, and the reasoning is the right-hand column plus one line from our affordable markets data: growth lives in the land and the entry price, not in the tax schedule.
Price the asset, not the concession
The 2027 rules made new builds more attractive on tax and did nothing to make them better assets. If a specific new build survives the same scrutiny you would apply to any established purchase, the concession is a legitimate tiebreaker once the definition becomes law. Until then, the sequence stays what it has always been: asset first, structure second, tax third.
Sources
- Tax reform implementation - Prime Minister’s media release, 18 June 2026
- Treasury Laws Amendment (Tax Reform No. 1) Act 2026 - Federal Register of Legislation
- CGT and negative gearing amendments - Corrs Chambers Westgarth
- What counts as a new build under the 2026 Budget - Aussie
- Federal Budget 2026-27 negative gearing - Pitcher Partners
- Residential property depreciation averages - BMT Tax Depreciation
- Off-the-plan settlement valuations, CoreLogic data to June 2019 - Smart Property Investment
- Construction insolvencies fall for the first time in five years (ASIC data) - The Good Builder
- Master Builders analysis of construction time blowouts - Real Estate Business
- Fraser Rise suburb profile - Your Investment Property
- Melton suburb profile - Your Investment Property
- Marsden Park suburb profile - Your Investment Property
- St Marys suburb profile - Your Investment Property
- Yarrabilba suburb profile - Your Investment Property
- Herron Todd White Month in Review commentary, March 2023 - via Elite Agent
This is general information only and not financial, tax, or credit advice. The “new residential dwelling” definition was not legislated at the time of writing and the treatment described may change. Speak to your accountant before structuring a purchase around the 2027 rules.
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