Mandatory Climate Reporting Australia 2026: Your AASB S2 Compliance Guide

Australia's mandatory climate-related financial disclosure regime is no longer on the horizon — it is here. With the passage of the *Treasury Laws Amendment (Financial Market Infrastructure and Other Measures) Act 2024* and the Australian Accounting Standards Board's release of AASB S2 Climate-related Disclosures, organisations across the country face binding obligations to report on climate risks, governance structures, and greenhouse gas emissions in a standardised, auditable format.

For Group 2 entities — those meeting at least two of the three thresholds of consolidated revenue exceeding $200 million, gross assets exceeding $500 million, or more than 250 employees — the first mandatory reporting period begins 1 July 2026. If your organisation falls into this category, the window for preparation is closing rapidly.

> AASB S2 is not a voluntary sustainability report. It is a financial reporting standard with the same legal weight as accounting standards — subject to audit, assurance, and regulatory enforcement by ASIC.

What Is AASB S2 and Why Does It Matter Now?

AASB S2 is Australia's domestic adoption of the International Sustainability Standards Board's IFRS S2 Climate-related Disclosures standard. It requires reporting entities to disclose material information about climate-related risks and opportunities that could reasonably be expected to affect their cash flows, access to finance, or cost of capital.

The standard is built on the four-pillar architecture established by the Task Force on Climate-related Financial Disclosures (TCFD), which Australian regulators, investors, and financial institutions have been progressively adopting since 2017. With AASB S2, what was previously best practice becomes law.

Three factors make this standard particularly significant:

1. Legal enforceability: Disclosures under AASB S2 form part of the annual report and are subject to assurance. ASIC has signalled it will monitor compliance from the first reporting cycle.
2. Investor expectations: Major institutional investors — including Australian superannuation funds managing over $3.9 trillion in assets — have explicitly called for standardised, comparable climate data aligned with ISSB frameworks.
3. Supply chain effects: Even organisations not directly captured by the standard will face disclosure requests from customers, lenders, and partners who are.

The Phased Timeline: Who Reports When

The Australian Government has implemented a three-group phased approach to bring entities under the regime progressively. Understanding which group your organisation falls into is the essential first step.

Group 1 — 1 January 2025: Entities meeting at least two of: consolidated revenue ≥ $500 million, gross assets ≥ $1 billion, or ≥ 500 employees. Also includes entities required to report under the National Greenhouse and Energy Reporting Act (NGER). These organisations are already in their first mandatory reporting period.

Group 2 — 1 July 2026: Entities meeting at least two of: consolidated revenue ≥ $200 million, gross assets ≥ $500 million, or ≥ 250 employees. This group captures a significantly larger cohort of mid-cap and large private companies — many of which have limited prior experience with structured climate disclosure.

Group 3 — 1 July 2027: Entities meeting at least two of: consolidated revenue ≥ $50 million, gross assets ≥ $25 million, or ≥ 100 employees. This final phase brings the regime to a broad base of mid-market organisations.

What Disclosures Are Required?

AASB S2 mandates disclosures across four interconnected pillars. Each pillar has specific requirements that go well beyond high-level narrative statements.

### 1. Governance

Organisations must disclose the governance processes, controls, and procedures used to monitor and manage climate-related risks and opportunities. This includes identifying which board committees oversee climate matters, the frequency of board engagement, and how climate considerations are integrated into remuneration, strategy, and risk management at both board and management levels.

### 2. Strategy

Entities must describe the climate-related risks and opportunities that could reasonably be expected to affect their business model, strategy, and cash flows — over the short, medium, and long term. Critically, AASB S2 requires climate scenario analysis demonstrating organisational resilience under different warming pathways, including a scenario consistent with 1.5°C of global warming.

### 3. Risk Management

Disclosure of the processes used to identify, assess, prioritise, and monitor climate-related risks — and how these processes are integrated into the organisation's overall risk management framework. ASIC has indicated it expects to see evidence of genuine integration, not standalone climate risk registers that exist in isolation from enterprise risk management.

### 4. Metrics and Targets

This is where the quantitative rigour comes in. Entities must disclose:

• Scope 1 greenhouse gas emissions (direct emissions from owned or controlled sources)
• Scope 2 greenhouse gas emissions (indirect emissions from purchased electricity, heat, or steam)
• Scope 3 greenhouse gas emissions (all other indirect emissions in the value chain) — subject to transitional relief provisions
• Climate-related targets, including baseline, timeline, and progress metrics
• The amount and percentage of assets or business activities vulnerable to climate-related physical and transition risks

> Scope 3 emissions — the most complex category — are subject to transitional relief for the first three reporting periods. However, organisations that wait until the relief expires will face a significantly compressed preparation timeline. The time to build Scope 3 data collection capability is now.

Scope 1, 2, and 3: Understanding Emissions Reporting

Greenhouse gas emissions reporting under AASB S2 follows the GHG Protocol Corporate Standard — the globally accepted framework for emissions accounting.

Scope 1 covers direct emissions from sources owned or controlled by the organisation: fuel combustion in company vehicles, on-site generators, industrial processes, and fugitive emissions. For most non-industrial organisations, Scope 1 represents a relatively small proportion of total emissions but requires robust measurement systems.

Scope 2 covers indirect emissions from the generation of purchased electricity, heating, cooling, and steam consumed by the organisation. AASB S2 requires both location-based and market-based accounting methods, reflecting the organisation's grid exposure and any contractual arrangements such as power purchase agreements or renewable energy certificates.

Scope 3 is the most challenging category, covering all other indirect emissions across the upstream and downstream value chain — including purchased goods and services, business travel, employee commuting, waste disposal, and the use and end-of-life treatment of sold products. For many financial services organisations, Scope 3 constitutes over 90% of total emissions, with financed emissions (Category 15) representing the dominant source.

How AASB S2 Aligns with ISSB S2 and TCFD

AASB S2 is not a uniquely Australian invention — it is Australia's jurisdictional adoption of the global baseline established by the ISSB. This alignment is deliberate and offers significant advantages for organisations operating across APAC.

• ISSB S2 (IFRS S2): The global baseline standard issued by the International Sustainability Standards Board. AASB S2 is substantively aligned, with limited Australian-specific modifications.
• TCFD: The four-pillar framework (governance, strategy, risk management, metrics/targets) that underpins both ISSB S2 and AASB S2. The TCFD disbanded in 2024, with the ISSB absorbing its monitoring responsibilities.
• Singapore (SGX): Mandatory climate reporting from FY2025 for listed companies, aligned with ISSB standards.
• Hong Kong (HKEX): Mandatory climate-related disclosures from January 2025 for Main Board listed issuers, based on ISSB S2.
• Japan (SSBJ): Exposure drafts released in 2024, mandatory reporting expected from 2027 for prime-listed companies.

For organisations operating across multiple APAC jurisdictions, the convergence around ISSB S2 means that investment in AASB S2 compliance simultaneously builds capability for disclosure requirements in Singapore, Hong Kong, and other markets progressively adopting the ISSB framework.

Practical Steps Organisations Should Take Now

With the Group 2 deadline approaching in July 2026, organisations that have not yet begun substantive preparation should treat this as urgent.

1. Determine your reporting group and timeline. Confirm whether your organisation meets the Group 2 thresholds based on your most recent financial year. If there is any ambiguity around consolidation boundaries or employee count methodology, seek advice early.
2. Conduct a gap analysis. Assess your current climate-related disclosure practices against the full requirements of AASB S2 across all four pillars. Most organisations find significant gaps in governance documentation, scenario analysis capability, and Scope 3 data collection.
3. Establish governance structures. Ensure board-level and management-level oversight of climate-related risks is formally documented, with clear roles, responsibilities, and reporting cadences. ASIC will expect evidence of genuine governance, not retrospective documentation.
4. Build emissions data infrastructure. Scope 1 and 2 measurement typically requires 3–6 months to establish robust data collection processes. Scope 3 requires significantly longer — particularly for organisations with complex supply chains or financed emissions exposure.
5. Develop scenario analysis capability. Climate scenario analysis is new territory for many organisations. It requires cross-functional collaboration between sustainability, finance, risk, and strategy teams — and the outputs must be integrated into financial planning, not treated as a standalone exercise.
6. Engage your assurance provider early. AASB S2 disclosures will be subject to limited assurance initially, progressing to reasonable assurance. Early engagement with your auditor ensures alignment on methodology, data quality expectations, and documentation standards.
7. Prepare your people. Board directors and senior management face personal accountability for the accuracy and completeness of climate disclosures. Targeted training programmes ensure leadership teams understand their obligations and can engage meaningfully with the material.

How ACS Helps: From Strategy to Compliance

Adventure Consultancy Solutions (ACS) delivers end-to-end sustainability advisory specifically designed for APAC organisations navigating mandatory climate disclosure regimes. Our approach combines strategic advisory with practical implementation — ensuring organisations do not just achieve compliance, but build lasting capability.

With a range of options from single seat, enterprise and software as a service licensing and support structures, ACS makes it easy to accelerate reporting capabilities and achieve end-state compliance in a relatively short period of time — 3 months or less.

We can support a structured high-touch experience or low-touch consultative implementation to ensure we meet you at your experience point. Our aim is to be there on the journey with you and provide the additional support your organisation needs to navigate the complex reporting structures.

Our software as a service model means you accelerate into consumption and reporting versus building ecosystems to support new technology and infrastructure — the perfect solution for enterprises and organisations who want a known and proven capability which is aligned to reporting and framework standards as they evolve.

### Sustainability Strategy Development

ACS builds sustainability frameworks aligned with AASB S2, ISSB S1/S2, SGX, HKEX, and ASX requirements. Each framework is tailored to your industry, operational footprint, and investor expectations — with clear implementation roadmaps, governance structures, and milestone tracking.

### Carbon Footprint Assessment

As a strategic partner of Unravel Carbon, ACS leverages technology-enabled solutions with deep regional domain experience and extends them to conduct comprehensive carbon footprint assessments across Scope 1, 2, and 3. Our assessments use GHG Protocol methodologies, identify emission hotspots, and establish verified baselines for target-setting against frameworks such as the Science Based Targets initiative (SBTi).

### Compliance Monitoring and Reporting

ACS provides ongoing compliance monitoring that tracks legislative developments across Australia, Singapore, Hong Kong, and other APAC markets. Our reporting services include data collection framework design, narrative development, quantitative metric compilation, and assurance readiness preparation — structured to satisfy AASB S2 requirements from the first reporting cycle.

### Board and Management Training

ACS delivers targeted training programmes that equip leadership teams with the knowledge to fulfil governance obligations under AASB S2 — covering climate risk oversight, scenario analysis interpretation, and fiduciary duties related to sustainability disclosures.

> Organisations that treat AASB S2 as a compliance burden will spend more and gain less. Those that approach it as a strategic opportunity — to understand climate risk, strengthen governance, and build investor confidence — will create lasting competitive advantage.

Key Takeaways

• AASB S2 is a legally enforceable financial reporting standard — not a voluntary sustainability report. ASIC will monitor compliance from the first cycle.
• Group 2 entities (revenue ≥ $200M, assets ≥ $500M, or ≥ 250 employees) begin mandatory reporting from 1 July 2026.
• Disclosures cover four pillars: governance, strategy, risk management, and metrics/targets — including Scope 1, 2, and 3 greenhouse gas emissions.
• Scope 3 transitional relief provides three years of flexibility, but organisations should begin building data collection capability immediately.
• AASB S2 is aligned with ISSB S2, meaning compliance effort translates across APAC jurisdictions adopting the same framework.
• Gap analysis, governance structures, emissions data infrastructure, and scenario analysis capability should all be underway now for Group 2 entities.
• ACS provides end-to-end support — from strategy and carbon assessment (via Unravel Carbon partnership) to compliance monitoring and board training — with flexible SaaS, enterprise, and managed service delivery options.

Ready to discuss your AASB S2 compliance strategy? Contact ACS — we help APAC organisations navigate mandatory climate disclosure requirements from gap analysis through to reporting readiness. You may also find our sustainability advisory services relevant to your planning.