The Senate reconvenes on Monday, June 22. The Senate Economics Legislation Committee tables its report that same morning. By the end of the week, the government wants its landmark tax overhaul — the Treasury Laws Amendment (Tax Reform No. 1) Bill 2026[6]Treasury Laws Amendment (Tax Reform No. 1) Bill 2026 – Parliament of Australia“Bill's parliamentary status and text as introduced” — passed into law. As of Tuesday night, three of the most critical documents that bill requires to function do not exist.
The government has not released the apportionment formula that millions of Australian taxpayers will need to determine their capital gains obligations at the July 1, 2027 transition. It has not defined what counts as a "new residential dwelling" for the purposes of the bill's centrepiece negative gearing exemption. And despite repeated promises, it has published no discussion paper outlining options for startup, junior mining, and small-business carve-outs that tech sector leaders, venture capitalists, and resource companies have been demanding for weeks.
On June 16, Prime Minister Albanese made clear that none of those documents would arrive before the Senate vote[1]Labor refuses to fast-track CGT carve-outs as business waits for details on Budget tax changes“Albanese refused to fast-track startup carve-outs before the Senate vote; talks with Greens 'well underway'; NDIS committee extended to same day as tax bill committee report”. The carve-outs discussion paper would be released "within days," he said — but its timing is not linked to the inquiry or the vote. The Senate is being asked to write a blank cheque.
What has Albanese refused to do — and why does it matter?
For three weeks, leaders of Australia's technology, venture capital, biotech, and junior mining sectors have sought a single commitment: that the government will specify, before the Senate votes, what protections will apply to low-capital, high-growth businesses that would be devastated by paying up to 47% tax on the proceeds of a startup sale.
Albanese's answer on June 16 was unambiguous. "What we've had is consultation up to this point. That (Treasury) discussion paper will go out, which will enable further input, which will be fed into the legislation later this year,"[1]Labor refuses to fast-track CGT carve-outs as business waits for details on Budget tax changes“Albanese refused to fast-track startup carve-outs before the Senate vote; talks with Greens 'well underway'; NDIS committee extended to same day as tax bill committee report” he told reporters at a press conference in Clifton Springs, Victoria.
That framing — "later this year" — confirms what the government has been hedging on since Budget night: the carve-outs will arrive in a second bill, at an unknown time, with unknown content. For now, senators are being asked to vote for the framework, sight unseen.
Tech Council of Australia chief executive Kate Cornick told the Senate hearing on June 16 that her sector was waiting on the discussion paper but had had "no indication from the government about its timing"[1]Labor refuses to fast-track CGT carve-outs as business waits for details on Budget tax changes“Albanese refused to fast-track startup carve-outs before the Senate vote; talks with Greens 'well underway'; NDIS committee extended to same day as tax bill committee report”. Australian Investment Council chief executive Navleen Prasad told senators that domestic tech successes such as Canva and Employment Hero would not exist without the tax settings the government is now proposing to dismantle.
Investment manager Geoff Wilson was more direct. "That's the end of small companies. Effectively all the money will go to Rio, BHP, the big banks — the top 10 companies, that's where all the money will go," he told senators, warning the changes would "discourage risk-taking" and "reduce the capital available to the businesses that create jobs, innovation, and economic growth."
Treasurer Jim Chalmers has excluded the Business Council of Australia from the consultation process[1]Labor refuses to fast-track CGT carve-outs as business waits for details on Budget tax changes“Albanese refused to fast-track startup carve-outs before the Senate vote; talks with Greens 'well underway'; NDIS committee extended to same day as tax bill committee report”, singling it out as a body whose objections reflect opposition to the policy direction rather than substantive technical concerns. The government's posture toward dissenting expert opinion — from the Business Council of Australia to CPA Australia to the Tax Institute — is not that it has answered those concerns, but that it has chosen to dismiss them.
What is the apportionment formula — and why has nobody published it?
This is the structural flaw that has received the least attention in four weeks of public debate but may be the most consequential.
The bill works by forcing every Australian resident individual and trust holding a CGT asset on June 30, 2027, to undergo a "deemed disposal" — a notional sale at market value — just before July 1, 2027, with a deemed reacquisition on that date[2]Capital gains tax and negative gearing amendments: key changes and implications“'It is a less than satisfactory position when several critical aspects of the Bill, including the apportionment method...will be left to legislative instruments that have not been released at the time that Parliament will be expected to vote'”. Any gain accrued before that date remains subject to existing rules, including the 50% discount where applicable. Any gain accruing after July 1, 2027, is taxed under the new indexed regime.
The mechanism requires every affected taxpayer to know the market value of every asset at a precise point in time. For listed shares, that is trivial. For private company shares, trust interests, rural land, business goodwill, and pre-1985 assets, it is expensive, time-consuming, and prone to ATO challenge.
The government provides an alternative: rather than obtaining a formal valuation at July 1, 2027, taxpayers may use an "apportionment method" — a formula for estimating value based on the asset's growth rate. Taxpayers do not have to choose between the two methods until they actually sell the asset, which could be years later.
The problem, confirmed by three independent legal and accounting analyses: that apportionment formula has not been released[2]Capital gains tax and negative gearing amendments: key changes and implications“'It is a less than satisfactory position when several critical aspects of the Bill, including the apportionment method...will be left to legislative instruments that have not been released at the time that Parliament will be expected to vote'”. It will not appear in primary legislation. It will be published, at some unspecified future date, in a ministerial legislative instrument that any future Treasurer can amend without returning to Parliament.
Corrs Chambers Westgarth[2]Capital gains tax and negative gearing amendments: key changes and implications“'It is a less than satisfactory position when several critical aspects of the Bill, including the apportionment method...will be left to legislative instruments that have not been released at the time that Parliament will be expected to vote'” partners Rhys Jewell and Simon Mifsud put the problem plainly in the firm's June 3 analysis:
It is a less than satisfactory position when several critical aspects of the Bill, including the apportionment method but also more fundamental eligibility criteria and exceptions, will be left to legislative instruments that have not been released at the time that Parliament will be expected to vote on the passage of the Bill.
Corrs Chambers Westgarth, Capital Gains Tax analysis, June 3, 2026
PwC's June 1 analysis noted[3]2026-27 Federal Budget – CGT and housing tax reform“Deemed disposal of CGT assets at July 1 2027; apportionment formula not yet released; market value vs apportionment method decision deferred until actual realisation event” that the choice between the market value method and the apportionment method does not need to be made until the taxpayer lodges their tax return for the income year in which the actual realisation event occurs — meaning taxpayers could hold assets for years in a state of compound uncertainty.
Accounting firm Byrons is equally direct: "The exact formula has not yet been released. However, Treasury's explanatory materials indicate that it is expected to estimate the value of an asset at 1 July 2027 based on its average rate of growth over the ownership period."[4]Tax Reform Legislation Introduced“The exact formula has not yet been released. Treasury materials indicate it is expected to estimate value at 1 July 2027 based on its average rate of growth over the ownership period.” A growth-rate formula, Byrons notes, would be an imperfect tool for assets with volatile or non-linear performance histories.
The missing pieces
- Zero of nine required ministerial instruments published (CPA Australia, June 9 submission)
- Zero formula for apportionment method published (Corrs, PwC, Byrons)
- Zero definition of "new residential dwelling" enacted in primary legislation (Corrs)
- Zero carve-out protections for startups or junior miners legislated (Cornick, June 16 hearing)
Corrs went further, noting the valuation challenge is most acute for pre-CGT assets — those acquired before September 20, 1985. All pre-CGT assets will be deemed to have been sold and reacquired at market value on July 1, 2027, with capital gains accruing from that date subject to the new CGT regime[2]Capital gains tax and negative gearing amendments: key changes and implications“'It is a less than satisfactory position when several critical aspects of the Bill, including the apportionment method...will be left to legislative instruments that have not been released at the time that Parliament will be expected to vote'”. This is the first time in the history of Australian taxation that assets held since before 1985 will be brought comprehensively inside the CGT net. The allocated value at July 1, 2027, determines permanently how much of any future gain remains exempt. Get it wrong and an ATO dispute could follow years later — against records that are decades old.
PwC warns that taxpayers holding illiquid or hard-to-value assets "face significant compliance costs and practical difficulties" and notes that the ability to obtain accurate market valuations retrospectively may become more difficult over time[3]2026-27 Federal Budget – CGT and housing tax reform“Deemed disposal of CGT assets at July 1 2027; apportionment formula not yet released; market value vs apportionment method decision deferred until actual realisation event”. The rational response for any prudent investor with private company shares, a family trust, a rural property portfolio, or a pre-1985 business asset is to commission a formal valuation now — rather than wait for a formula that may never arrive, or may arrive and prove inferior.
This is, in effect, a mandatory valuation regime imposed on millions of Australians that the government has not acknowledged as such. The alternative formula is dangled as a simplification option; the reality is that until the formula is published and its terms understood, many sophisticated taxpayers will have no choice but to assume the valuation route and begin commissioning that work well before June 2027. CPA Australia estimated annual compliance costs for the bill at between $295 million and $542 million per year — three to six times Treasury's own figure of $88.4 million — plus a one-off transitional cost of $675 million to $825 million[7]Unintended consequences: how the CGT, negative gearing changes impact SMSFs“CPA Australia estimated annual compliance costs at $295-542 million per year, 3-6 times Treasury's estimate, plus $675-825 million one-off transitional cost”. The valuation burden is not included in either estimate.
What about startups, junior miners, and venture capital?
The bill's carve-out problem is not merely procedural. It is structural. The original CGT discount, introduced by the Howard government in 1999, served a legitimate function for businesses where capital is the primary input: a startup founder who invests a decade of sweat equity into a company with no initial asset base is not in the same position as a real estate speculator harvesting a windfall from a pre-existing land holding. That is why jurisdictions across the developed world maintain either rollover relief or discounted rates for long-held productive business assets.
The Labor government knows this — which is why it has promised startup carve-outs, and why Chalmers has told the Tech Council, the Australian Investment Council, COSBOA, and the Australian Chamber of Commerce and Industry that consultation is "real and genuine and meaningful." But as Cornick told senators on June 16, the Tech Council had received "no indication from the government about" the timing of the discussion paper[1]Labor refuses to fast-track CGT carve-outs as business waits for details on Budget tax changes“Albanese refused to fast-track startup carve-outs before the Senate vote; talks with Greens 'well underway'; NDIS committee extended to same day as tax bill committee report” on which those carve-outs will be based.
COSBOA chief executive Skye Cappuccio reported that some business owners were already postponing sale decisions pending legislative clarity, creating precisely the investment uncertainty the government claims its reforms will resolve. No startup carve-out exists in the bill as introduced. No ministerial instrument specifying any carve-out has been published. No timeline for when such protections will be legislated has been provided.
The Chalmers approach — pass the framework, consult later, fix it in a second bill — is the same logic used to defend all nine of the bill's unwritten ministerial instruments. It assumes that once the framework passes, the Senate will surrender its leverage over the details. It should not.
The NDIS inquiry as political bargaining chip
A Senate committee examining NDIS reform was given a three-day extension and will now report on Friday, June 19 — the same day as the Senate Economics Legislation Committee's report on the tax bill[1]Labor refuses to fast-track CGT carve-outs as business waits for details on Budget tax changes“Albanese refused to fast-track startup carve-outs before the Senate vote; talks with Greens 'well underway'; NDIS committee extended to same day as tax bill committee report”. The coincidence is not accidental.
The Coalition has been hoping to convince the Greens to agree to a months-long delay to the tax inquiry in exchange for concessions on the NDIS[1]Labor refuses to fast-track CGT carve-outs as business waits for details on Budget tax changes“Albanese refused to fast-track startup carve-outs before the Senate vote; talks with Greens 'well underway'; NDIS committee extended to same day as tax bill committee report”. Finance Minister Katy Gallagher — who manages government business in the Senate — said Labor was "in pretty close contact with all parties" on how to get its legislation through. "Look, we're in active discussions, as you would expect, with parties in the Senate," she said.
This is the Senate reduced to legislative horsetrading. Two pieces of significant social legislation — one that will reshape the tax treatment of investment for a generation, one affecting 160,000 Australians on the NDIS — are being wielded against each other in a race to July 2, the winter recess deadline.
The Greens, who hold 10 Senate votes without which Labor cannot pass the tax bill, have made their demands clear: the grandfathering provisions scrapped, making the CGT and negative gearing changes retrospective; and the ministerial discretion provisions constrained so no future Treasurer can quietly reverse the changes through a disallowable instrument. Senator Nick McKim has described those discretion clauses as giving the Treasurer powers that could be used to "reapply the 50 per cent capital gains tax discount and unrestricted negative gearing on any asset class that he or she might want to apply it to."[9]CGT changes: Greens hint they want to scrap grandfathering in Labor's Budget tax changes“McKim signalled Greens want retrospective changes and constraints on ministerial discretion; committee report due June 22”
The bill's six-week sprint
- May 12, 2026 — Budget night; CGT and negative gearing changes announced
- May 28, 2026 — Bill introduced by Treasurer Chalmers; Senate committee referred same day
- June 4, 2026 — Bill passes House of Representatives after 16 hours of debate and 21 divisions
- June 9, 2026 — Committee submissions close; 11 days after introduction
- June 15–16, 2026 — Two days of public hearings in Canberra and Sydney
- June 16, 2026 — Albanese refuses to fast-track carve-outs; apportionment formula still missing
- June 19, 2026 — Committee report formally due
- June 22, 2026 — Senate reconvenes; committee report tabled; Senate debate begins
- July 2, 2026 — Government's Senate passage deadline before winter recess
Why the Senate should not pass this bill on June 22
The procedural failures catalogued over the past three weeks — 11 days for public submissions on landmark legislation, two days of hearings for the most complex CGT reform since 1999, nine ministerial instruments unwritten — are not administrative imperfection. They are a deliberate political strategy. By bundling the carve-outs discussion paper with the bill as a "framework," by rushing to the winter recess, and by refusing to extend the committee process even as the NDIS inquiry extension was granted, the government has ensured the Senate votes while holding the weakest possible hand.
The Tax Institute noted that other measures with an earlier commencement date — including the permanent extension of the instant asset write-off, with a July 1, 2026 start — have not yet been legislated at all, yet were excluded from this "time-critical" bill[5]Treasury Laws Amendment (Tax Reform No. 1) Bill 2026 – Submission“Instant asset write-off (July 2026 commencement) not yet legislated despite being left out of this bill; creates clear inconsistency in prioritisation”. That inconsistency speaks directly to intent: popular tax measures are used as leverage to pass controversial structural reforms, while the structural details are deferred to second and third bills the Senate will not have approved in advance.
Senator David Pocock, who supports the policy direction of CGT reform, called on June 11 for the Senate to split the bill, arguing the government was "actively avoiding scrutiny" by bundling CGT changes with popular tax cuts that should pass separately[8]Labor sets parliamentary date for CGT, negative gearing bill“Senator Pocock called for bill to be split; Greens use Senate inquiry as leverage in ongoing negotiations”. That remains the right position.
Shadow housing minister Senator Andrew Bragg expressed it more bluntly at the June 16 hearing, accusing the government of having "no bloody idea" about the distributional impact and describing the process as one that had "debased a committee system that was usually one of the best things about how politics functioned."
The Senate is not a rubber stamp. It exists precisely to impose the scrutiny the House could not. On June 22, it should exercise that power — by refusing to pass a bill whose core transition mechanism has no formula, whose key definitional terms remain unlegislated, and whose promised carve-outs are months away from even a discussion paper. Australia deserves better than voting blind.