The design debate is over. The lodgement window is open.

Eighteen days to 30 June: Australia's first public country-by-country reports and the United Kingdom's first Pillar Two filings land on that date, with the first GloBE Information Return and minimum tax returns effectively extended to 30 July; the High Court closes the door on S.N.A Group; and Washington restates the price of the side-by-side bargain.

The ATO has released detailed operational guidance, shared through briefings with professional bodies this month, on how the first Australian Pillar Two lodgements will actually work. The structure is now settled. The Combined Global and Domestic Minimum Tax Return, the CGDMTR, consolidates three of the four Australian lodgement obligations into a single form: the Domestic Minimum Tax Return, the Australian IIR/UTPR Tax Return, and the Foreign Lodgement Notification. It is lodged through Online Services for Business or Online Services for Agents, with instructions at QC 106330 and sample forms published on the ATO website. The GloBE Information Return is lodged separately, as an XML file conforming to the OECD GIR schema, through the file transfer facility, and every file requires the Bulk Business Document Message wrapper specified for ATO bulk data exchange.

The dates now converge on 30 July. Every in-scope taxpayer receives an automatic 30-day lodgement deferral for the AIUTR and DMTR for the 2024 fiscal year only, taking the first CGDMTR lodgements to 30 July 2026. The GIR's statutory due date cannot be extended: the first lodgement for December 2024 year-ends formally falls on 30 June 2026. The ATO has, however, confirmed an automatic 30-day suspension of lodgement enforcement for the first year, mirroring the treatment of the foreign lodgement notification and effectively extending first GIR lodgements to 30 July as well. Neither concession touches payment. Any IIR, UTPR or domestic minimum tax liability for the first year remains payable on the original due date, so a group with a top-up liability must fund it before its return is lodged. Longer deferrals can be requested through Secure Mail or Practice Mail with the prescribed form, one MNE group per request, lodged before the due date with reasons.

The quiet trap in the guidance is administrative lead time. Where a group wishes to nominate a new tax agent specifically for Pillar Two, the entity itself, not the agent, must first request creation of a Global and Domestic Minimum Tax account and role through the Online Services for Business secure mail facility, and the ATO advises these requests are being completed on average within 28 days. The client-to-agent nomination that follows gives the agent a further 28 days to accept. A group starting that process today does not comfortably reach even the effective 30 July date. The guidance confirms two significant simplifications: where a tax agent is already the client-level income tax agent for the entity, no new account, role or linking is required to lodge; and where a Designated Local Entity lodges for the group, only the DLE requires the account, not every group entity.

The ATO has also scheduled its fourth and final open information session before the deadline for Thursday 25 June 2026, 1:30 to 3:00 pm AEST, covering account and role creation, testing the GIR XML before lodgement, joint venture lodgement mechanics and implementation progress. It is the last opportunity to put live questions to the project team before the first cycle closes, and the group's Pillar Two lead should pre-register.

What clients should do. Confirm this week who is lodging: DLE on behalf of the group, or group entity standalone, and ensure the form is completed on that basis, because the ATO has flagged both incorrect lodger-type selection and entity details that do not match current ATO records as causes of processing delay. Confirm portal access and, where an existing income tax agent will lodge, rely on the existing linking rather than initiating new account creation. Confirm the digital service provider can generate the GIR XML with the BBDM wrapper, or secure conversion tooling now. Answer the liability questions in the CGDMTR precisely: an entity that is in scope and not exempted under the lodgement exemption instrument (LI 2025/28) answers yes and reports zero where the liability is nil, while answering no is reserved for entities exempt under the instrument, excluded entities, and entities not required to report either a domestic top-up tax amount or an IIR top-up tax amount, including a nil amount. Get the form right the first time: the ATO has confirmed that an amendment is accepted only once the period of review opens. And where any first-year top-up liability exists, diarise payment for the original due date, not the deferred lodgement date.

The ATO has confirmed through its business bulletins that the first reports under Australia's public country-by-country reporting regime are due by 30 June 2026. The regime, enacted in December 2024, applies to reporting periods commencing on or after 1 July 2024, which makes the period ended 30 June 2025 the first reporting period for June balancers, with the report due within 12 months of period end. In-scope entities, broadly CbC reporting parents of groups with annual global income of A$1 billion or more and at least A$10 million of Australian-sourced aggregated turnover, must report selected tax information for Australia and for specified jurisdictions on a disaggregated basis, with the balance of the world reported on an aggregated basis. The ATO will publish the information on data.gov.au, with the first publication expected in late 2026.

The compliance stakes are materially higher than a routine schedule. The report is a legislated lodgement with significant global entity penalty settings, so failure to lodge attracts penalties of up to A$825,000. The information, once published, is permanent: investor relations, procurement counterparties, journalists and competitors will read jurisdiction-level revenues, profits, taxes paid and effective rates without the contextual narrative that accompanies statutory accounts. Several data points in the public CbC dataset will also be read against the group's GloBE filings and its OECD CbC report, and inconsistencies between the three will be visible to the regulator and, in part, to the public.

Exemptions remain available but are not automatic. The Commissioner may exempt an entity from all or part of the obligation, and the ATO has encouraged early submission of exemption applications for entities with a 30 June 2026 deadline. An application lodged in the final fortnight cannot be assumed to be processed before the due date, and an unresolved application does not suspend the obligation.

What clients should do. For June 2025 balancers, treat this as a live, dated obligation falling a month ahead of the effective GIR date rather than a second-half task: confirm scope, complete the data template, and reconcile the public CbC dataset against the OECD CbC report and the GloBE return before lodgement so that the three filings tell one story. Prepare a short external narrative for publication day, because the first data release on data.gov.au will generate coverage. For December balancers, the same obligation arrives on 31 December 2026, and exemption conversations with the ATO should begin now, not in November.

The most consequential Australian case of the week is not a transfer pricing decision, a Part IVA decision or a sham decision. It is a decision about whether a contract existed at all. In Commissioner of Taxation v S.N.A Group Pty Ltd [2026] FCAFC 10, handed down on 17 February 2026 by McElwaine, Feutrill and Wheatley JJ, the Full Federal Court denied close to A$19 million of deductions claimed by two operating companies in the Coronis real estate group for "service fees" paid to related trustee companies across the 2016 to 2019 income years. The High Court is reported this week to have refused the taxpayers' special leave application, finalising the Full Court decision as the governing authority. The structure was a familiar one: a 2005 reorganisation separated the operating companies from the entities that owned the group's trade-mark, key personnel and rent roll, with written licence agreements requiring the operating companies to pay for the use of those assets. The written agreements lapsed in mid-2015. The operating companies kept using the assets and kept paying. The Commissioner disallowed the deductions and imposed administrative penalties.

The reasoning is what makes the decision so widely applicable. Applying the objective theory of contract, the Full Court held that a deduction under section 8-1 requires a liability that has been incurred, and that a liability under a contract, whether written or inferred from conduct, requires an outward manifestation of mutual assent communicated between the parties. The private subjective intentions of directors who sit on both sides of the arrangement are not relevant. Continued use of the assets, monthly payments, recording in the financial statements and director-approved accounts did not, the Court held, objectively demonstrate that the operating companies and the trustee companies had agreed to be bound; those facts were "equally consistent with the absence of a binding agreement". Expert benchmarking evidence that the fees were fair, reasonable and within an arm's length range was rejected as going to pricing, not to the prior question of whether any contractual liability existed at all. The first-instance judge had inferred a contract from surrounding circumstances and allowed the deductions; the Full Court reversed.

Why it matters. The exposure is not confined to private groups. The identical question reaches every related-party charge that rests on conduct rather than a current, signed, mutually executed agreement: management fees, head-office and shared-service recharges, brand and IP licence fees, rent-roll and property licences, cost-sharing and secondment charges. For inbound groups, the Australian side of a globally documented transfer pricing arrangement can still fail the section 8-1 "incurred" test if the local entity cannot show an enforceable Australian-law contract behind the recharge, which means the transfer pricing file and the deductibility file are now separate questions that must both be answered. For Australian-parented groups, the same applies to domestic parent-to-subsidiary recharges, where the section 8-1 question stands apart from any Subdivision 815-B analysis of the foreign leg. And because S.N.A Group involved administrative penalties as well as primary tax, the cost of getting it wrong is not limited to the deduction.

What clients should do. Before 30 June, produce a schedule of every intra-group service, management, IP licence, royalty, rent-roll, cost-allocation, secondment and recharge arrangement for the 2025-26 year, and test each against the S.N.A Group standard: a current written agreement executed by all parties (not merely approved by common directors), contemporaneous evidence of mutual assent such as board minutes and correspondence rather than year-end accounting entries, tax invoices issued during the year, and payments referrable to the agreement. Where an arrangement is running on lapsed or absent documentation, regularise it now, and where a historical exposure exists, weigh a voluntary disclosure before any review, given the penalty discount available for disclosures made before notification of an audit.

The United Kingdom tax authority has written directly to in-scope groups confirming that many must submit their first Pillar 2 returns by the end of June 2026. The UK package has three components. Every in-scope group must file a UK tax return covering Multinational Top-up Tax and Domestic Top-up Tax, even where the parent jurisdiction has not implemented Pillar Two and even where no liability arises. Each group must also either file a GloBE Information Return in the UK or, where the GIR has been filed centrally in another exchange-network jurisdiction, an overseas return notification identifying where and by whom it was filed. All three are filed through the Pillar 2 online service using commercial third-party software, by the filing member, which is the ultimate parent entity by default unless another member is nominated. The UK is following the OECD GIR XML schema without amendment, which assists groups preparing a single return for multi-jurisdiction use. First deadlines are 18 months after period end, 15 months thereafter, and the UK has adopted the transitional approach to GIR filing and exchange published following the OECD's May 2026 guidance.

The instructive caveat in the UK guidance concerns the exchange network itself. The UK has taken the steps needed to exchange GIR information with all participating jurisdictions, but not all relationships have been mutually activated, and groups are directed to the OECD's published list of activated exchange relationships. That asymmetry matters anywhere central filing is relied upon: relief from local filing exists only where the exchange relationship between the central filing jurisdiction and the local jurisdiction is actually in force at the filing date. The European Commission has just resolved one such gap, confirming by way of a frequently asked question published on 29 May that the Cypriot income inclusion rule is qualified by direct operation of Article 3(18) of the EU Pillar Two Directive for fiscal years commencing on or after 31 December 2023, notwithstanding its absence from the OECD central record, that Cyprus can receive top-up tax information returns from 31 May 2026, and that central filing in Cyprus relieves other Member States from requiring an additional domestic filing under the DAC9 exchange directive, Directive (EU) 2025/872.

What clients should do. Australian-parented groups with UK constituent entities should confirm before the end of June which entity is the UK filing member, that it holds a Pillar 2 reference number, and that software capable of filing the UK tax return and the GIR or overseas return notification is in place, because none of the three can be filed manually. Groups intending to file the GIR centrally in Australia should verify that the Australia-UK exchange relationship is activated on the OECD list before relying on an overseas return notification, and the same verification applies in reverse for UK or EU-parented groups with Australian members. Where a group's central filing jurisdiction is Cyprus or another jurisdiction with recently confirmed status, retain the Commission FAQ and the OECD relationship list in the lodgement file as the authority for not filing locally.

Treasury Secretary Scott Bessent testified before the House Ways and Means Committee on 4 June, in remarks reported this week, that implementation of the side-by-side arrangement, under which United States multinationals are exempted from the income inclusion and undertaxed profits rules of other jurisdictions, is progressing well. The reassurance came with an explicit reservation: the United States retains "the tools necessary" to respond if the arrangement is not honoured, a reference to the retaliatory taxing powers that were drafted as section 899 and shelved when the G7 agreed the side-by-side framework in 2025. The OECD announced the arrangement in January 2026.

In the same hearing, Bessent confirmed that the United States is pressing Europe, Turkey, Brazil, India and Canada over digital services taxes. The pressure coincides with retreat: on 3 June the Canadian Prime Minister directed a rewrite of the rule under the Online Streaming Act that would have required foreign streamers earning more than C$25 million in Canada to contribute 15 per cent of Canadian revenues to local content, following Canada's earlier rescission of its digital services tax under United States pressure. Whatever the formal denials, the sequence is now familiar: a unilateral measure aimed at predominantly American technology and media firms attracts trade-channel pressure, and the measure is narrowed or withdrawn.

For Australian groups the relevance is twofold. First, Australia's proposed News Bargaining Incentive, a charge on large platforms offset by news licensing spending, sits squarely in the category Washington is targeting, and the Meta complaint lodged under the free trade agreement last week now has a clearly signalled enforcement environment behind it. Second, the side-by-side arrangement reshapes the competitive landscape within Pillar Two itself: Australian-parented groups remain fully inside the IIR and UTPR net while United States-parented competitors are carved out of those rules, although domestic minimum taxes, including Australia's, continue to apply to the local operations of US-parented groups. That asymmetry changes relative effective tax rates in third markets and will inform structuring, acquisition pricing and the location of new investment. Boards comparing post-tax returns against United States peers should ensure that modelling reflects the carve-out as it is being implemented, not the symmetrical regime originally legislated.

The 1 July perimeter shift is three weeks away. Two of the regime changes commencing on 1 July 2026 alter the compliance baseline for advisers and multinational groups alike. The automatic transfer pricing penalty regime applies from that date, attaching penalties where documentation standards are not met rather than leaving penalty exposure to audit discretion, and groups should ensure that transfer pricing documentation for FY26 positions is in place before the change. On the same day the Tranche 2 anti-money laundering reforms bring lawyers, accountants and other professional service providers within the AML/CTF regime, with client due diligence obligations applying to designated services from commencement.

Senate report on the CGT and negative gearing Bills due 22 June. The Senate Economics Legislation Committee is due to report on the Treasury Laws Amendment (Tax Reform No 1) Bill 2026 and its companion rates Bill on 22 June, with the Government signalling passage in the winter sittings. The measures, covered in detail in last week's brief, replace the 50 per cent CGT discount with indexation plus a 30 per cent minimum tax on real gains from 1 July 2027 and quarantine residential negative gearing for post-Budget acquisitions. The committee report is the last realistic point at which design amendments emerge before passage.

Diverted profits tax team closure takes effect 30 June. The ATO's specialist diverted profits tax team ceases as a separate function on 30 June 2026, with DPT risk assessment folding into mainstream international structuring compliance. Groups with open DPT risk reviews should confirm their contact and escalation pathways with their case teams before the changeover.

Payday Super commences 1 July. Superannuation guarantee contributions become payable at the same time as salary and wages from 1 July 2026. The exceptional-circumstances framework in draft PS LA 2026/D3 remains open for comment until 26 June, and employers with complex payroll cycles should review remediation settings before commencement.

A working view of the milestones now in play for in-scope groups. The statutory GIR date has not moved; the enforcement posture has. Confirm each entity's obligation against its local rules, and verify exchange activation before relying on central filing.