The Three-Tranche Structure — Where Do You Sit?
Australia's mandatory sustainability reporting framework under AASB S2 Climate-related Disclosures operates on a three-tranche commencement schedule. Understanding which tranche applies to your entity is the starting point for any preparation programme.
Group 2 — Mid-size entities meeting two of three size thresholds: 500+ employees, A$500M+ consolidated revenue, A$1B+ consolidated gross assets. In scope from 1 July 2026.
Group 3 — Smaller entities and NGER reporters. In scope from 1 July 2027.
If your entity is approaching Group 2 eligibility, you have a 12-month preparation window from today. That is tighter than it sounds — the disclosure obligations under AASB S2 require data collection, governance processes, scenario analysis, and assurance preparation that cannot be compressed into the final quarter before your first reporting period.
The Four Disclosure Pillars — What You Must Report
Governance
Your disclosure must explain how your board and management oversee climate-related risks and opportunities. This is not a description of what your board could do — it requires disclosure of what the board actually does: how climate is integrated into board agendas, what management reporting reaches the board, what skills and expertise exist at board level, and how the board monitors management's implementation of climate-related decisions.
For most Group 2 entities, this requires a genuine governance review. Climate risk must become a standing board agenda item, not an annual strategy day discussion.
Strategy
Strategy disclosure requires explanation of how climate-related risks and opportunities affect your business model, strategy, and financial planning over short, medium, and long-term time horizons. This includes quantitative disclosure of the financial effects of climate risks and opportunities where material — which, for most entities, means identifying which asset values, revenue streams, or cost structures are exposed to physical or transition risk.
Climate scenario analysis is a mandatory component of strategy disclosure. Entities must assess their resilience under at least two scenarios — typically a low-emissions (1.5°C or well below 2°C) and a higher-emissions (3°C or above) pathway. The analysis must be documented, disclosed, and defensible.
Risk Management
Entities must disclose how climate-related risks are identified, assessed, prioritised, and managed within their overall enterprise risk management framework. This means integrating climate risk into the risk register — with defined likelihood, consequence, and velocity assessments — and disclosing how it connects to existing ERM processes rather than sitting as a separate sustainability function.
Metrics and Targets
Group 2 entities must disclose Scope 1 and Scope 2 greenhouse gas emissions from the first reporting period. Scope 3 disclosure is required if material — and for most entities in financial services, professional services, or retail, Scope 3 emissions from purchased goods and services or product use will be material and must be disclosed.
Any climate-related targets (net zero commitments, emissions reduction goals, renewable energy targets) must be disclosed with the methodology, base year, and interim milestones.
The Greenwashing Risk — What ASIC Is Watching
ASIC has made sustainability disclosure enforcement a priority, and the penalty risk for Group 2 entities is real. In its most significant greenwashing actions to date, ASIC secured penalties of A$10.5 million against Active Super and A$11.3 million against Mercer Super for misleading sustainability claims — amounts that would be material to any mid-size entity.
The greenwashing risk for Group 2 entities extends beyond sustainability marketing. Under AASB S2, the annual report climate disclosure itself becomes a regulated document. Claims that are unsubstantiated — emissions reductions that cannot be traced to methodology, net zero commitments without credible transition plans, scenario analysis that assumes unrealistic outcomes — create enforcement exposure under the Corporations Act and the Australian Consumer Law.
The Practical Preparation Sequence for Group 2 Entities
With 12 months to the Group 2 commencement date, a structured preparation sequence matters. The following order reflects where most entities should prioritise effort:
- Group classification confirmation — formally document which tranche applies and the first reporting period dates for your entity.
- Governance gap analysis — assess current board and management engagement with climate risk against the governance disclosure requirements. Identify gaps in board skills, agenda integration, and management reporting.
- Materiality assessment — identify which climate risks and opportunities are material to your business model, and which Scope 3 categories are material to your emissions profile.
- Data infrastructure — establish Scope 1 and 2 data collection processes. For Scope 3, identify which categories require supplier engagement or spend-based estimation.
- Scenario analysis — conduct and document climate scenario analysis. For Group 2 first-year reporting, qualitative analysis is acceptable, but should be rigorous and disclosed transparently.
- Assurance preparation — Group 2 entities are subject to limited assurance from the first reporting period. Engage your assurance provider early — they will need to understand your methodology, data sources, and internal controls before they can issue an opinion.
- Disclosure drafting — draft the four-pillar disclosure and review against ASIC's greenwashing guidance, AASB S2's disclosure requirements, and your assurance provider's expectations.
How Proximo ESG Navigator Supports Group 2 Preparation
Proximo ESG Navigator provides AI-assisted AASB S2 gap analysis, scenario modelling frameworks aligned to NGFS pathways, Scope 1/2/3 measurement and categorisation tools, and compliance checking against current ASIC greenwashing guidance. The platform updates automatically when ASIC or AASB publishes new guidance — so your disclosure preparation stays current with regulatory expectations, not last quarter's version of the standard.