Australia's mandatory climate-related financial disclosure regime — under AASB S1 and AASB S2, the local implementation of ISSB IFRS S1 and S2 — entered force for Group 1 entities for financial years beginning on or after 1 January 2025. The first reports are landing now. Group 2 entities follow for FY 2026–27, and Group 3 for FY 2027–28.
For Australian reporting entities, this is the most significant change to corporate disclosure since the introduction of the original Operating and Financial Review. For multinationals with Australian subsidiaries, it adds another regulatory perimeter alongside CSRD, SEC climate, and UK SDS.
This guide explains scope, timing, content, and practical readiness — based on the Treasury legislation, AASB standards, and ASIC supervisory guidance as of mid-2026.
Who Is in Scope
Australia's three-group phased approach uses size thresholds that are stricter at first and then progressively widen.
Group 1 (FY 2024–25 and onwards)
Entities meeting any two of three thresholds:
- Consolidated revenue ≥ AUD $500 million
- Consolidated gross assets ≥ AUD $1 billion
- 500 or more employees
Plus all entities required to register with ASIC that are emitters under the National Greenhouse and Energy Reporting (NGER) Act with reported facility emissions above the relevant threshold.
Group 2 (FY 2026–27 and onwards)
Entities meeting any two of three thresholds:
- Consolidated revenue ≥ AUD $200 million
- Consolidated gross assets ≥ AUD $500 million
- 250 or more employees
Plus NGER controlling corporations regardless of emission thresholds.
Group 3 (FY 2027–28 and onwards)
Entities meeting any two of three thresholds:
- Consolidated revenue ≥ AUD $50 million
- Consolidated gross assets ≥ AUD $25 million
- 100 or more employees
Group 3 also has a modified reporting regime — companies in this group with no material climate-related financial risks may file a streamlined statement.
What Australian Entities Must Disclose
AASB S2 (the climate standard) closely tracks ISSB IFRS S2 with Australian-specific modifications. The required disclosures cover four pillars:
1. Governance
How climate-related risks and opportunities are governed at board and management levels, including the body responsible, oversight processes, and how climate considerations are integrated into strategy, decision-making, and remuneration.
2. Strategy
The climate-related risks and opportunities the entity has identified, how they affect the business model, strategy, and financial planning. This includes:
- Scenario analysis: required from Year 1 for Group 1, deferred for Group 2 and Group 3 in early years
- Climate-related transition plan: where the entity has one, the plan and its implementation
- Financial effects: current and anticipated effects on financial position, performance, and cash flows
3. Risk Management
How climate-related risks are identified, assessed, prioritised, and integrated into the entity's overall risk management.
4. Metrics and Targets
The metrics used to measure climate-related risks and opportunities, including:
- Scope 1 and Scope 2 emissions: required from Year 1
- Scope 3 emissions: relief in first reporting year only; required thereafter
- Industry-based metrics: cross-referenced to applicable industry standards
- Internal carbon prices: if used
- Remuneration linked to climate metrics: if applicable
- Climate-related targets: including absolute or intensity-based, scope of GHGs covered, base year, milestones, methodologies
Australian Modifications to ISSB IFRS S2
AASB S2 is not identical to IFRS S2. Key Australian-specific modifications:
- Climate-only first. AASB S1 (general sustainability) is not yet mandatory in Australia — only AASB S2 (climate). Australian entities do not yet disclose biodiversity, water, or social topics under the mandatory regime.
- Scenario analysis scope. AASB S2 requires scenarios consistent with the temperature outcomes targeted by Australia's NDC commitments under the Paris Agreement, with at least one well-below-2°C scenario.
- Transition plan disclosure modifications. Disclosure is required where a plan exists; entities are not mandated to develop a plan.
- Scope 3 emissions deferral. Group 1 entities receive a one-year relief on Scope 3 emissions disclosure.
- Modified safe harbour. Australia's legislation includes a three-year limited safe harbour for forward-looking climate statements made in good faith, protecting against private litigation.
Assurance Requirements
Australian entities are subject to a phased assurance regime:
- Year 1 (Group 1): limited assurance over Scope 1 and Scope 2 emissions disclosures only
- Year 2 (Group 1): limited assurance extends to other climate disclosures
- Year 4 onwards: reasonable assurance over the full climate statement
Audit and Assurance Standards Board (AUASB) standards (ASAE 3410 and the new sustainability assurance standards) apply. The Big 4 and several mid-tier firms have built dedicated sustainability assurance practices.
Where AASB S2 Reports Live
The mandatory climate statement is part of the annual report under the Corporations Act, sitting alongside the financial statements and directors' report. It is not a separate sustainability report.
This means:
- Same filing deadline as financial statements
- Same audit timing pressures
- Same board sign-off requirements
- ASIC enforcement applies
For listed entities, ASX continuous disclosure obligations also apply to material climate-related developments year-round, not just at annual report time.
Practical Readiness for First Reporters
If you are a Group 1 entity and your first reporting period is FY 2024–25 (year-ended 30 June 2025 or 31 December 2025), your readiness path looks like:
- Board and management capability. Climate competence at board level is now a legal expectation, not best practice. ASIC has signalled it will look closely at how boards have built capability.
- Data infrastructure. Scope 1 and Scope 2 emissions data must be auditable. Manual spreadsheets won't survive limited assurance.
- Scenario analysis. This is the most underestimated component. Two scenarios (one ≤2°C, one higher-warming) require board-level discussion, plausibility, and disclosed assumptions.
- Materiality determination. Not "double materiality" as in CSRD — Australia uses single (financial) materiality under ISSB. But the determination must be documented and defensible.
- Internal control evidence. Even before reasonable assurance kicks in, limited assurance auditors will probe controls over data collection and review.
For Group 2 and Group 3 entities, FY 2026 and 2027 may feel distant — but the data collection and capability work takes 12–18 months in practice. Starting now is not premature.
Interaction With Other Regimes
Australian-headquartered multinationals are often caught by multiple frameworks simultaneously:
- CSRD: if the group has a qualifying EU subsidiary or EU branch, CSRD applies to those entities. Australian disclosures don't satisfy CSRD obligations and vice versa.
- NZ Climate Standards (CRD): if the group has New Zealand subsidiary climate reporting entities, separate CRD disclosures apply.
- Singapore SGX climate: if the group has SGX-listed subsidiaries in priority sectors.
- UK SDS: if any group entity becomes subject to forthcoming UK Sustainability Disclosure Standards.
Each regime is broadly ISSB-aligned but locally modified. Treating them as one report is a common and material mistake.
ASIC Supervisory Priorities
ASIC has signalled the following supervisory priorities for the first reporting cycles:
- Scenario analysis quality: superficial or boilerplate scenarios will attract enforcement attention
- Greenwashing in transition plans: claims must be supported by evidence
- Board oversight evidence: minutes, papers, and capability records
- Materiality decisions: defensibility of what was and wasn't reported
- Scope 3 readiness: even with the Year 1 deferral, ASIC expects evidence that work is underway
ASIC enforcement under the Corporations Act applies — penalties for misleading climate statements can include both civil penalties and director liability.
How ESGFlux Helps
ASIC, AASB, AUASB, Treasury, APRA, ASX, and the SDA work in parallel on Australian sustainability rules. Australian compliance teams operate against an evolving supervisory environment that doesn't slow down between reporting cycles.
ESGFlux monitors Australian regulators alongside the ISSB, EFRAG, ESMA, SEC, FCA, and other major bodies — giving Australian compliance teams a single feed for both local rule changes and the broader international developments that shape AASB direction.
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