Budget 2026, explained for property investors: what the negative gearing and CGT changes really do — and what they don't

At 7:30pm on Tuesday 12 May 2026, the Treasurer told the House of Representatives that Australia's property-investor tax rules — substantially unchanged since the 50% CGT discount was introduced in 1999 — were going to change. The detail of what he announced, and what he very carefully did not, will reshape investor decisions in this country for the next decade.

This is the piece I would walk a client through tonight, in person, if they were holding a recent contract or thinking about signing one. It is long because the detail matters: a sentence-level mis-reading of the grandfathering or the new-build carve-out is the difference between keeping your existing tax position and accidentally walking out of it. It is also, deliberately, calm. The headlines this week will not be calm. The maths is.

A note before any of it: what was announced on Budget night is a policy proposal. The grandfathering, the dates, and the carve-outs only fully bite once legislation passes both Houses of Parliament. That will almost certainly happen — the Government has the numbers — but the exact wording can move, and the few items still being consulted on are flagged below. Where the Budget speech and Treasury's papers are clear, this guide treats them as the working assumption. Where they are not, it says so.

General information only. Personal tax, structuring, and credit decisions require advice on your own numbers.

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The short answer

For most investors, three things matter from Tuesday night.

One. If you already own an investment property as of 7:30pm on 12 May 2026 — or you are under contract on a property at that moment — you are grandfathered. The current negative gearing rules and the current 50% CGT discount continue to apply to that asset, on its current settings, for as long as you hold it. You did not need to sign anything on Budget night. The cut-off was set at the moment of the speech precisely so it could not be gamed.

Two. From 1 July 2027, two changes take effect on new acquisitions. First, the ability to deduct net rental losses against non-property income (the classic "negative gearing" benefit) is restricted to newly constructed dwellings only. Established-property investors will still be able to claim deductions against rental income from the same property, and against capital gains on disposal — but excess losses against salary, wages, or business income will no longer be available on established stock. Second, the 50% CGT discount on new acquisitions is replaced with cost-base indexation, returning that part of the tax system to the pre-1999 rules. Indexation increases your cost base in line with CPI, so you only pay CGT on real (above-inflation) gains. Newly constructed dwellings keep both the 50% discount and full negative gearing — a deliberate carve-out designed to channel investor capital into new supply rather than the established market.

Three. Between 12 May 2026 and 30 June 2027 — a 14-month transition window — properties acquired during this period get partial old-rules treatment until 30 June 2027, then flip to the new rules from 1 July 2027 onwards. Post-Budget commentary has clarified that this is meaningfully different from the permanent grandfathering enjoyed by properties already owned at 7:30pm on 12 May 2026 — a distinction worth understanding in detail before you sign a contract. We walk through what the window does and doesn't buy you, with worked numbers and a seven-question framework, in the companion piece: Buying an investment property before 30 June 2027 — when the window is worth the rush, and when it isn't.

That is the news. The rest of this article is what those three things actually mean for the maths.

The sources for these announcements are the Treasury Budget 2026-27 portal and the Treasurer's Budget speech (published in full text by The Daily Telegraph), supported by Tuesday-night coverage at the ABC News, The Guardian Australia, the Australian Financial Review, realestate.com.au, and news.com.au.

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Change one: negative gearing, restricted to new builds

Negative gearing, as the ATO's own guidance explains it, has always been a feature of the broader rule that allows losses on income-producing assets to be offset against other assessable income. For property investors, the practical mechanic has been familiar: if rent received is less than interest, depreciation, property management, rates, insurance, and the rest of the deductible costs, the net rental loss is deductible against salary, wages, or business profits in the same year. If those other sources cannot absorb the loss, it carries forward into future years.

What changes from 1 July 2027 is the scope of who can apply that loss against non-property income. For new acquisitions of established (existing) residential investment property, net rental losses on that property will only be deductible against:

• rental income from the same property, and
• the eventual capital gain on disposal of that property.

That sounds technical. It matters because the classic Australian leveraged-investor playbook — buy an established three-bedder, borrow most of the purchase price, take the negative cash-flow position, and let salary income absorb the tax loss while capital growth does the heavy lifting — is only available, after 1 July 2027, on newly constructed dwellings.

The HIA's pre-Budget economic modelling and the Property Council's commentary argue this will reduce overall investor participation rather than redirect it, and that the rental market will tighten. Treasury's own modelling, reported on Budget night, takes a different view — projecting that the policy mix shifts roughly 75,000 first home buyers from rental tenancies into ownership over five years and reduces median dwelling prices by approximately 2% by 2030. Independent economists quoted by the AFR place the price effect closer to 4%. Both can be right at different points in the cycle; both views matter to your decision.

What is not changing on the negative-gearing side: the basic principle that investment losses are deductible against investment income on the same asset; the rules for owner-occupier interest (which has never been deductible and isn't suddenly becoming so); the rules for genuinely commercial property; and the rules for properties already held at Budget night.

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Change two: the 50% CGT discount, replaced by indexation

The second change is the larger one in revenue terms and the more conceptually clean. From 1 July 2027, for new acquisitions of investment property (other than newly constructed dwellings, which keep the discount), the 50% CGT discount described in the ATO's CGT discount page is replaced with cost-base indexation, returning the system to the rule that applied before 21 September 1999.

In practical terms:

• Today, if you buy a property for $700,000, sell it years later for $1,100,000, and have owned it for more than 12 months, you have a $400,000 nominal gain. Half of that — $200,000 — is the assessable capital gain, taxed at your marginal rate.
• Under indexation, the $700,000 cost base would be uplifted each year in line with the Consumer Price Index, locking out inflationary "phantom" gains. If average CPI over the holding period were 3% a year over ten years, the indexed cost base becomes roughly $940,000. The assessable gain is the full difference, but the difference is now $160,000 rather than $400,000 — taxed in full at your marginal rate.
• The two systems produce different outcomes depending on your inflation environment and holding period. In a low-inflation, high-real-growth world, the 50% discount is better. In a high-inflation, modest-real-growth world (which is broadly the world investors have been living in for the last three years), indexation can produce a lower tax bill. Indexation is not categorically worse — it is differently shaped.

The Government has paired this with a 30% minimum effective tax rate on capital gains from 1 July 2027, targeted at very high-income earners who would otherwise pay less than 30% on a discounted gain. The same 30% minimum is extended to discretionary trust distributions from 1 July 2028, closing what Treasury describes as an income-streaming loophole. For most investors on standard marginal rates this floor will not change anything; for the top tier of investors using trust structures, it does.

For the canonical, technical detail of the existing CGT regime — what the discount is, who qualifies, what's excluded — the ATO's CGT discount page and property CGT page remain the reference. Both will be updated once the new legislation passes; this article will be updated when they are.

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The grandfathering: what is protected, what isn't

The Government's design here is deliberate. The grandfathering line was set at 7:30pm AEST on 12 May 2026 — the moment the Treasurer began the relevant section of the speech — and is explicitly designed to prevent a rush of "lock-in" contracts in the weeks after Budget night. The AFR's first-night coverage and the Brisbane Times/Age live updates both report the same effective time stamp.

What this means in practice:

Two specific points are worth nailing down because they will be misunderstood:

Grandfathering attaches to the asset, not to the investor. If you sell a grandfathered property in 2029 and buy a different one, the new property is acquired under the new rules. The grandfathering does not "transfer" with you. This is one of the most consequential lines in Treasury's papers and the one I expect investors to misread first.

Refinancing a grandfathered loan does not break grandfathering. Changing your interest rate, switching lenders, redrawing equity within the original loan structure, or restructuring the loan against the same grandfathered property all preserve the position, on the most natural reading of the announced rules. (This is also what the Treasurer's office briefed reporters on the night, as captured in the SmartCompany write-up.) If you have been sitting on a non-competitive rate inside a grandfathered investment loan, Tuesday night is not a reason to leave it there — quite the opposite. A refinance with us, or with anyone, does not move your tax position. It only moves your cashflow.

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The new-build carve-out: the policy's most consequential clause

Both reforms have an explicit exception for newly constructed dwellings. New builds:

• retain full negative-gearing deductibility against non-property income, and
• retain the 50% CGT discount on disposal.

The intent is plain and explicit in the Treasurer's speech: the Government wants investor capital channelled into supply rather than absorbed by the established market. Whether the policy delivers that — the HIA position is that it won't, while Treasury's housing supply portfolio projects that it will — is the question economists will argue about for the next two years.

What is uncontroversial, for an investor, is that a new-build investment property purchased after 1 July 2027 will be the most tax-advantaged residential property shape available in the post-reform world. It will keep both the negative-gearing benefit on losses against salary and the 50% CGT discount on long-term gain. Established-property purchases will keep neither. That difference, applied to a typical $700,000–$900,000 purchase over a ten-year hold, runs into tens of thousands of dollars of cumulative after-tax difference.

This does not mean every investor should pivot to new builds. New construction has its own risks — completion risk, valuation-at-settlement risk, build-quality variation, oversupply pockets — that established stock does not. The off-the-plan and construction guides on this site walk through those in detail. But it does mean that the relative attractiveness of new vs established has shifted decisively, and a buyer who was indifferent between the two now has a structural reason to look harder at new.

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What is not changing

It's worth saying clearly. The Budget did not touch:

• The main residence CGT exemption. Your home, if it has been your principal place of residence for the entire ownership period, remains fully exempt from CGT. The full exemption, the six-year absence rule, and the partial-exemption rules for periods of investment use are all preserved.
• Owner-occupier interest deductibility. Interest on your own-home mortgage was never deductible and still isn't. (This is the single most frequently misunderstood point in Australian property tax — please don't let anyone tell you Budget night changed it.)
• SMSF tax rates. Earnings inside a complying SMSF in accumulation phase remain at 15%; in pension phase, 0% on the supporting balance, subject to the transfer balance cap. Property held inside super continues to be governed by SIS Act rules rather than the new individual-investor regime. Because the SMSF regime is unchanged while the individual regime tightens, SMSF property investment becomes relatively more attractive — though it is constrained by the limited-recourse borrowing rules, contribution caps, and the substantial compliance overhead that comes with running a fund.
• Foreign investor rules. The ban on foreign purchases of established dwellings, in place since April 2025, was extended permanently. Foreign nationals can still buy off-the-plan new builds and contribute to supply.
• The Help to Buy scheme and the Home Guarantee Scheme. Both remain in their current form, with the 5% First Home Guarantee continued. First home buyers retain the same federal supports they had on Monday.
• Build-to-Rent developer concessions. The ATO's Build-to-Rent guidance is unchanged. The Government has extended the BTR settings to keep institutional capital flowing into purpose-built rental supply.

If you want a single one-line read on this Budget for owner-occupiers and first home buyers: nothing in your life changed on Tuesday night. The reforms are an investor policy, with a small set of macro effects that flow back into the wider market.

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What Treasury modelled, and what the critics modelled

The Government's own numbers, presented on Budget night and surveyed across the ABC and Guardian coverage:

• 75,000 first home buyers assisted into ownership over five years, on Treasury's central case.
• Median dwelling prices ~2% lower by 2030 than they would otherwise have been (Treasury central case). Independent economists surveyed by the AFR place this closer to 4%.
• ~35,000 fewer dwellings built over the same period (Treasury), with the HIA's commissioned modelling placing it as high as 46,000 (NG change alone) and 33,000 (CGT change alone). The new-build carve-out is intended to mitigate both numbers.
• ~$8 billion in additional revenue over five years, recycled into cost-of-living measures, infrastructure, and budget repair.

The cleanest summary across the industry-body reaction is in The Urban Developer's roundup of HIA, MBA, PCA, and REIA positions. All four oppose the changes. The Property Investment Professionals of Australia (PIPA) released a same-night investor action plan that broadly aligns with the broker view in this guide.

The macro backdrop for all of this is important to keep in view. The RBA's May 2026 Statement on Monetary Policy describes a cash rate at 4.35% after three hikes through the first half of 2026, driven by an oil-supply-shock-led inflation pickup and a tight labour market. Property prices, on the ABC's reading of the Budget background economic statement, have been broadly flat for nine months. The Government's tax change layers onto a market that is already adjusting; the price effects will be harder to isolate than the modelling suggests.

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The political risk: this is a proposal until it isn't

A pre-emptive truth. What was announced on Tuesday is intended policy. The bills have not yet been drafted, let alone passed. Until they pass both Houses, the rules can:

• Move on dates (we have already seen the grandfathering window tightened twice in the lead-up).
• Move on scope (consultation is open on the treatment of properties contracted before 12 May 2026 but settled after 30 June 2027 — see the SmartCompany analysis).
• Move on the new-build definition (what counts as "newly constructed" — at issue of occupancy certificate? on first sale? — is in active consultation per the Property Council's commentary).
• Be amended in the Senate.

The Government has the lower-house numbers. The Senate maths is tighter, and the Greens are likely to push for the negative-gearing restriction to extend to all property (not just established) while the Coalition is likely to push the other way. The most likely outcome is that the broad architecture survives essentially as announced. The carve-outs are where the negotiation will happen.

What this means for your decisions over the next eight weeks: make the call on your underlying numbers, not on the policy detail you are still hoping for. If a refinance saves you $X a month, refinance. If a purchase is right for your circumstances, buy. The policy will land where it lands, and the grandfathering is now your shield regardless of what the consultation does with the corners.

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Decision tree: what to actually do this week

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What renters and first home buyers should expect

The two groups most affected by the macro flow of this policy aren't investors at all.

Renters. The honest answer is "it depends, in different directions, in different cities". Where investor demand for established stock cools first, rental supply could tighten in the short term as a smaller pool of investors competes for tenants. Where the new-build carve-out succeeds in pulling capital into construction, rental supply expands over the medium term. The HIA position and the Property Council's analysis are worth reading together for the bear case on rents.

First home buyers. Treasury's modelling projects an additional 75,000 first home buyers into ownership over five years and a ~2% price softening. That is one of the most aggressive pieces of housing-policy modelling the Department has published in years. If even half of it lands, the next 18 months is the most favourable buying window of the past decade for first home buyers — particularly those using the 5% Home Guarantee or Help to Buy.

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FAQ

Does the grandfathering apply if I sell and rebuy? No. The grandfathering attaches to the specific asset you held at 7:30pm on 12 May 2026. Selling and rebuying — even into a like-for-like property — moves the new acquisition under the new rules.

Does refinancing my investment loan break grandfathering? No. A refinance changes your interest rate and lender, not your tax position. The asset and its grandfathered status are unaffected. This is one of the more counter-intuitive points to land in the first week of coverage, but it is the consistent reading across the SmartCompany and AFR coverage and the Treasurer's office briefings.

Will my existing investment property's value fall by 2% overnight? No. Treasury's central-case projection is a ~2% softening of median dwelling prices by 2030, on the policy mix as a whole — not an immediate revaluation of every property in your portfolio. Markets adjust gradually and unevenly. The first six months of price data after the legislation passes will tell us much more than Tuesday's modelling.

What if I'm part-way through building a new home as an investor? New-build construction projects already in train sit at the favourable end of the rules. If your build is contracted pre-12 May 2026 and completes within the transition window, both grandfathering and the new-build carve-out can apply; you get to choose the more advantageous treatment. Detailed structuring advice is worth paying for here.

Should I rush to buy something before 30 June 2027 just to lock in the old rules? No. The cleanest test is the test that has always applied to investment property: is this asset a good investment on its operating fundamentals — rent, location, condition, growth profile, cashflow — independent of the tax treatment? If yes, the grandfathering is a bonus. If no, the grandfathering doesn't fix the underlying maths.

Does this affect commercial property? No, on the natural reading of the announcement and the Treasurer's commentary. The reforms target residential investment property held in individual or trust names. Commercial property tax rules are unchanged.

What about the 30% minimum tax rate — does that affect me? Only if your taxable income, after all deductions and the new indexation rules, puts an otherwise-discounted capital gain into an effective tax rate below 30%. For most investors on standard PAYG salaries, the marginal rate already exceeds 30%, so the minimum is not the binding constraint. For high-income earners using trust structures, it is.

Will the Coalition reverse this if it wins the next election? Unknown. Historically, once tax concessions are removed they are very hard to restore, because reinstating them looks like a cost to the budget bottom line. The negative-gearing concession that was removed in 1985 was reinstated in 1987, so there is some precedent for reversal. But the prudent assumption is that the new architecture will be durable.

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Closing

Tuesday night was a big announcement. It is not — and this matters — the end of negative gearing, the end of property investment, or the end of leverage as a wealth-building tool in Australia. The 1.6 million Australians who hold one investment property each, on the ATO's most recent data, are largely unaffected on what they already own. The two million who might have wanted to start are now choosing between an old-rules asset signed within the next 14 months, a new-build asset under the post-2027 rules, or an SMSF structure that the policy left intentionally untouched.

The decisions that matter most this week are the ones that don't depend on the policy at all. If your investment loan is on an uncompetitive rate, the case for refinancing just got slightly stronger, because grandfathering does not protect you from an expensive lender. If your borrowing capacity is the binding constraint on whether you can transact inside the 14-month window, the serviceability playbook is the place to start. And if you are mid-purchase or mid-build right now, the cleanest action is to ring your broker and your accountant before next week's news cycle has had a chance to muddle the rules in your head.

I run a small Australia-wide brokerage and I work directly with investors on these calls. If you want to walk through what the Budget means for your specific scenario — your existing portfolio, a property you are about to sign on, or the question of whether to keep buying — the contact page is the fastest way to get in front of me, and the investment-property calculators on this site will help you stress-test the numbers in the meantime.

The maths is still the maths. The grandfathering is real. The new-build carve-out is real. The dates are real. Once you have those four things in your head, the rest is detail.

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References used in this article

• Treasury Budget 2026-27 portal
• Full text of the Treasurer's 2026-27 Budget speech (The Daily Telegraph)
• What's in the Budget — ABC News, 12 May 2026
• Federal Budget 2026 tax reform — The Guardian Australia, 12 May 2026
• One-year grace period for NG/CGT changes — AFR
• CGT and NG reforms to hit house prices — AFR
• Federal Budget 2026 live updates — The Age / Brisbane Times
• Major changes to negative gearing & CGT — realestate.com.au
• Tax changes to NG and CGT will change Australia — news.com.au
• Budget 2026 investor buffer analysis — SmartCompany
• PIPA Federal Budget 2026 Investor Action Plan
• HIA — Why restricting NG for new homes doesn't increase supply
• HIA — Tax changes will cripple housing supply and punish renters
• Property Council — tax reforms will hit rents (via MPA)
• Peak housing groups react — The Urban Developer
• ATO — Negative gearing
• ATO — Rental expenses to claim
• ATO — CGT discount
• ATO — CGT when selling your rental property
• ATO — Build-to-Rent development tax incentives
• Treasury — Increasing housing supply
• Housing Australia — Home Guarantee Scheme
• RBA — Statement on Monetary Policy, May 2026