Key Facts at a Glance
- Bill: Treasury Laws Amendment (Tax Reform No. 1) Bill 2026
- Status: Passed the House of Representatives; before the Senate Economics Legislation Committee (report due 22 June 2026)
- CGT changes start: 1 July 2027 (all CGT events on or after)
- Negative gearing cut-off: 7:30pm AEST, 12 May 2026 (Budget night)
- Negative gearing quarantine starts: 1 July 2027
- 50% CGT discount: Replaced with cost base indexation
- Minimum tax on capital gains: 30%
- Carve-outs: New residential builds and affordable housing
The Change
Two Pillars of Australian Investment Tax, Both Being Rewritten at Once
If you own an investment property, hold shares outside of super, run a family trust, or are simply planning to sell an asset some day, the rules you have been working with for the last twenty-five years are about to change.
The Treasury Laws Amendment (Tax Reform No. 1) Bill 2026 — referenced on the Parliament of Australia website under bill ID r7493 — passed the House of Representatives in late May 2026 and is now before the Senate Economics Legislation Committee, with a report due back by 22 June 2026.
The Bill contains four schedules. Two of them — the CGT overhaul and the negative gearing restriction — will materially change after-tax returns on almost every form of long-held Australian investment. The other two introduce a new Working Australians tax offset and a $1,000 standard deduction for work-related expenses.
This article focuses on the two schedules that matter most for investors. If you want to talk about how the work-related deduction and offset affect your individual return, get in touch — the rest of this piece is about your capital.
Capital Gains Tax
The 50% CGT Discount is Being Replaced With Indexation
For more than twenty-five years, the 50% capital gains tax discount has been a defining feature of how Australians invest. Hold an asset for at least twelve months, sell it as an individual or a trust, and only half of the gain is taxable. That rule is being removed for CGT events happening on or after 1 July 2027.
In its place, the Bill restores cost base indexation for individuals and trusts. The cost base of a CGT asset will be indexed for inflation over the period the asset is held from 1 July 2027 onwards, which reduces the size of the taxable gain. The policy intent is straightforward: under indexation, only the real gain — the gain above inflation — is taxed.
For assets you already own, there is a transitional mechanism. Individuals and trusts holding a CGT asset on 30 June 2027 will be treated as having sold and reacquired that asset at its market value just before 1 July 2027. Any gain (or loss) on the pre-July 2027 portion is calculated under the existing rules — including the 50% discount — but is deferred until you actually sell. Indexation then runs from 1 July 2027 forward.
In practical terms, that means you do not lose access to the 50% discount on capital gains that have already accrued by 30 June 2027. But every dollar of growth from 1 July 2027 onwards is in the new system.
"Indexation rewards holding through inflation. Discount rewarded holding for twelve months. They are not the same incentive, and they reward very different investor behaviour."
Capital Gains Tax
A New 30% Minimum Tax on Capital Gains
The second leg of the CGT reform is a brand-new Division 119 in the Income Tax Assessment Act 1997, which imposes a 30% minimum rate of tax on certain capital gains made by Australian-resident individuals.
The way it works is essentially a top-up. The ATO works out what your basic income tax would be if the capital gain were removed from your assessable income, and what your basic income tax actually is with the gain included. If the difference is less than 30% of the gain, you pay an extra amount of income tax to bring the effective rate up to 30%.
This is targeted at a long-standing planning technique: realising large capital gains in income years where the rest of your income is unusually low, so that the entire gain is taxed at low or even zero marginal rates. Under Division 119, that strategy stops working as well as it used to.
There are exemptions for recipients of social security payments and certain means-tested government payments, so low-income individuals are not adversely affected. There are also carve-outs for gains that qualify under the new dwellings and affordable housing concessions (see below).
Division 119 applies to capital gains from CGT events happening on or after 1 July 2027.
Capital Gains Tax
Pre-CGT Assets Will Finally Be Brought Into the System
For the first time since CGT was introduced in September 1985, pre-CGT assets are being brought into the regime.
If you hold a CGT asset on 30 June 2027 that was a pre-CGT asset on that day, the Bill treats you as having sold and reacquired it just before 1 July 2027 at its market value. Any gain or loss on the pre-July 2027 portion is disregarded — so the pre-CGT history of the asset remains tax-free up to 30 June 2027 — but from 1 July 2027 onwards, growth is taxable under the new rules.
If you or a family trust holds pre-1985 assets, this is a moment to take stock. Valuations as at 30 June 2027 will become important records, because they fix the cost base for everything that comes after.
Concessions
New Dwellings and Affordable Housing Keep a 50% (or 60%) Discount
Not all assets are being moved into the indexation system. The Bill carves out two categories where the existing-style CGT discount continues to be available:
- New residential dwellings — eligible for a 50% discount on capital gains
- Affordable housing — eligible for up to a 60% discount
For these assets, individuals (and certain trusts) can choose between the discount and indexation. That election is made at the point the relevant CGT event happens. Capital gains that qualify for these concessions also sit outside the new 30% minimum tax in Division 119.
The policy direction is unmistakable: tax settings are being deliberately tilted towards new construction and toward housing that helps with affordability, and away from established stock.
Negative Gearing
Net Rental Losses on Established Residential Property Are Being Quarantined
Schedule 2 of the Bill inserts a new section 26-155 into the Income Tax Assessment Act 1997. It limits the deductibility of losses from residential dwellings used or held as residential accommodation.
The mechanics are simpler than the rhetoric around them. From the 2027–28 income year, if your deductions from quarantined residential dwellings exceed your assessable income from those dwellings, the excess is not deductible against other income. You cannot offset the loss against your salary, your business income, or your other investments. The excess becomes a "quarantined amount" that can only be used to:
- reduce a future net capital gain on the property, or
- carry forward and be applied against future net rental income from the same quarantined residential dwellings.
For most individual investors holding a single negatively geared established rental, that is a fundamental change to how the after-tax return is built.
Negative Gearing
What Is Grandfathered, and What Is Not
The most important date in the entire Bill is 7:30pm AEST, 12 May 2026 — Budget night. If you last acquired an interest in a residential dwelling before that time, that property is excluded from the quarantine. Existing investors holding established stock at Budget night are grandfathered.
If you acquired your interest on or after Budget night, the quarantine applies from 1 July 2027 onwards — unless the property qualifies as a "new residential dwelling" or fits within one of the other carve-outs listed in the Bill.
The carve-outs in section 26-155(2) and (4) include:
- residential dwellings acquired before Budget night
- new residential dwellings (with detailed requirements to be set by Ministerial determination)
- residential dwellings used for certain activities, purposes, businesses or enterprises specified by the Minister
- widely held unit trusts, complying superannuation entities, and certain other specified entities
- amounts that relate to providing a fringe benefit
The "new residential dwelling" definition is critical and the legislation explicitly leaves the detail to a future legislative instrument — the Minister can specify rules around the kind of dwelling, the kind of interest, the circumstances of creation (vacant land build, substantial renovation, replacement of a demolished dwelling), title structure, and whether the dwelling "genuinely adds to the supply of residential dwellings in Australia". Investors planning around new builds should expect more detail before 1 July 2027.
Interaction
The CGT and Negative Gearing Changes Reinforce Each Other
It is worth pausing on how these two reforms interact, because they are not independent.
Historically, the trade-off in residential property investment has been: accept a rental loss each year, deduct it against your salary at the top marginal rate, and rely on the 50% CGT discount to keep the eventual capital gain lightly taxed. The Bill compresses both halves of that trade-off at the same time.
- On the income side, the rental loss can no longer be deducted against your salary for newly acquired established residential property.
- On the capital side, the 50% discount is replaced with indexation, and a 30% floor is placed under the effective tax rate on the eventual gain.
For investors weighing up new builds versus established stock, the after-tax case for new builds is now materially stronger than it was before Budget 2026.
Action Plan
What You Should Do Now
The legislation is not yet law — the Senate Committee report is due 22 June 2026 and the Senate vote follows — but the policy direction is clear, the start dates are fixed in the Bill, and the negative gearing cut-off date (12 May 2026) is already behind us. Decisions made now have real consequences for how you are taxed in 2027–28 and beyond.
- Confirm the acquisition date of every residential investment property you own. The grandfathering test in section 26-155 turns on whether you "last acquired" the interest before 7:30pm AEST on 12 May 2026. For contracts entered into around that date, the exact timing matters.
- Plan around 30 June 2027 valuations. Every CGT asset held by an individual or trust on that date is treated as sold and reacquired at market value. For assets where the line between pre- and post-1 July 2027 growth will matter (real property, private company shares, long-held portfolios, pre-CGT assets), independent valuations are now part of your tax record-keeping.
- Re-test your property investment thesis under the new rules. If your model relied on a tax refund each year from rental losses plus a 50% CGT discount on exit, both of those assumptions need to be redone. New builds and affordable housing remain comparatively favoured.
- Be careful about realising gains "early" purely to lock in the 50% discount. The transitional rules already preserve the 50% discount on growth accrued to 30 June 2027 — you do not necessarily need to sell to capture it. But the deferred-gain rules are detailed, and the right answer is asset-specific.
- For trusts, expect new reporting obligations. The Bill inserts a new section 115-235 requiring trustees to give beneficiaries detailed statements categorising capital gains as residential, non-residential, deferred residential or deferred non-residential. Trustees and their advisers should plan for the changes to trust distribution statements ahead of the 2027–28 year.
- Talk to Hawkeye before you sign anything. The interaction between the new CGT rules, the negative gearing quarantine, and your existing structure (individual ownership, trust, SMSF, company) is not something to navigate from a generic article. We are working through the Bill in detail with our investor clients now.
Need a Plan Before 1 July 2027?
Book a consultation with Hawkeye Financial. We will work through your portfolio, your structures, and your timing so that the new CGT and negative gearing rules work with you — not against you.
Book a ConsultationThis article provides general information only and does not constitute financial, tax or legal advice. It is based on the Treasury Laws Amendment (Tax Reform No. 1) Bill 2026 as introduced and as it stood at the time of writing. The Bill has not yet passed the Senate and amendments are possible. Please consult a qualified professional regarding your specific circumstances before acting on any of the matters discussed.