Starting in January 2025, more than 10,000 Australian companies began a phased transition into mandatory climate-related financial disclosure under AASB S2. Unlike voluntary frameworks that preceded it, AASB S2 carries civil penalties of up to AU$16.5 million, mandates specific climate scenarios, and requires third-party assurance from day one.
This guide covers who must report, what AASB S2 requires, how it differs from IFRS S2, and what the legislated scenario analysis and modified liability provisions mean for Australian businesses preparing their first climate statements.
What Is AASB S2?
AASB S2 is Australia’s mandatory climate-related financial disclosure standard, approved by the Australian Accounting Standards Board on 20 September 2024. The Treasury Laws Amendment (Financial Market Infrastructure and Other Measures) Act 2024 inserted new sustainability-reporting provisions into Chapter 2M of the Corporations Act 2001, including sections 292A, 296A, 296B and 296D, which set the legislative requirements that AASB S2 operationalises.
AASB S2 is based on the international IFRS S2 climate-related disclosure requirements but operates as a standalone standard. It incorporates the general sustainability disclosure content from AASB S1 (Australia’s voluntary adoption of IFRS S1) directly into Appendix D, scoped to climate-related information only. Australian entities applying AASB S2 do not need to also apply AASB S1.
The Australian Securities and Investments Commission (ASIC) enforces AASB S2. Non-compliance carries civil penalties of up to AU$16.5 million or 10% of annual turnover, and directors face personal liability through mandatory declarations about their climate statements.
Who Must Report Under AASB S2?
AASB S2 applies to large and medium Australian entities through a three-group phased rollout. Entities must meet at least two of three size thresholds to fall within each group.
Deep dive
For year-end-specific disclosure dates plus the three Appendix C transitional reliefs that apply in Year 1, see AASB S2 Group 1, 2, and 3: When Each Group Must Report.
| Group | Reporting Starts | Revenue | Assets | Employees | Estimated Entities |
|---|---|---|---|---|---|
| Group 1 | 1 Jan 2025 | ≥ AU$500M | ≥ AU$1B | ≥ 500 | ~1,800 |
| Group 2 | 1 Jul 2026 | ≥ AU$200M | ≥ AU$500M | ≥ 250 | ~3,000 |
| Group 3 | 1 Jul 2027 | ≥ AU$50M | ≥ AU$25M | ≥ 100 | ~5,000+ |
Entities reporting under the National Greenhouse and Energy Reporting Act (NGER) above the 50 ktCO2-e threshold are automatically captured in Group 1 or Group 2, regardless of their size. Superannuation trustees with AU$5 billion or more in assets under management also fall within Group 2.
Group 3 entities have a materiality exemption under s296B of the Corporations Act. If an entity determines that climate risks are not material to its operations, it may lodge a “no material climate risks” statement with supporting explanation instead of preparing a full climate statement. This assessment must be defensible and documented.
What AASB S2 Requires
AASB S2 follows the same four-pillar structure established by the TCFD and carried forward by ISSB sustainability disclosure standards. Each pillar addresses a distinct dimension of climate-related financial disclosure.
Governance
Entities must disclose the governance processes, controls, and procedures used to monitor and manage climate-related risks and opportunities. This includes board-level oversight, management accountability structures, and how climate considerations factor into strategic decisions.
Strategy
The strategy pillar requires identification of climate-related risks and classification of each risk as physical or transition (Paragraph 10(b)). Entities must also specify time horizons for each risk (Paragraph 10(c)), describe geographic concentration of exposures (Paragraph 13), and quantify current and anticipated financial effects on position, performance, and cash flows (Paragraphs 15-21).
Risk Management
Entities must describe their processes for identifying, assessing, and monitoring climate-related risks (Paragraphs 24-26). This includes disclosing data sources used, the nature and likelihood of identified risks, and how climate risk management integrates with the entity’s broader risk framework.
Metrics and Targets
The metrics pillar includes cross-industry metrics that apply to all reporting entities. Paragraph 29(c) requires disclosure of the “amount and percentage of assets or business activities vulnerable to climate-related physical risks.” This asset vulnerability metric is one of the most data-intensive requirements in the standard, demanding location-level physical climate risk assessment across an entity’s asset portfolio.
| Requirement | AASB S2 Reference | Description |
|---|---|---|
| Physical risk identification | Para 10(b)-(c) | Classify risks as physical or transition; specify time horizons |
| Geographic concentration | Para 13 | Disclose geographic concentration of risks, facilities, and asset types |
| Financial effects | Para 15-21 | Quantify current and anticipated effects on financial position and performance |
| Scenario analysis | Para 22 | Assess climate resilience under mandated temperature scenarios |
| Risk management processes | Para 24-26 | Describe identification, assessment, and monitoring processes |
| Asset vulnerability metric | Para 29(c) | Amount and percentage of assets vulnerable to physical risks |
Scenario Analysis Requirements
AASB S2’s scenario analysis provisions go further than IFRS S2. Under the Corporations Act, Australian entities must assess climate resilience using at least two temperature scenarios:
- 1.5°C scenario: aggressive-decarbonisation pathway commonly used in industry practice to test transition-risk resilience
- “Well exceeding 2°C” scenario: high-warming pathway commonly used in industry practice to test physical-risk resilience
The legislation itself does not tie either scenario to a specific risk category. Each scenario disclosure must address the inputs, assumptions, time horizons, scope, and key variables required by AASB S2 Paragraph 22 and ASIC Regulatory Guide 280.
ASIC clarified in Regulatory Guide 280 (published March 2025) that 2.5°C or greater satisfies the “well exceeding 2°C” requirement. Using a scenario below 2.5°C creates compliance risk. This makes the high-warming scenario mandatory in substance, unlike IFRS S2 where entities choose their own scenarios.
For each scenario, entities must disclose the sources used, whether the scenario addresses physical or transition risks, time horizons considered, the scope of operations covered, and key assumptions including policy, macroeconomic, technology, and regional climate variables. Entities with heightened physical risk exposure may use localized climate-related scenarios. Both qualitative and quantitative approaches are acceptable, with the level of sophistication expected to be “commensurate with circumstances.”
In practice, the legislated ≥2.5°C threshold aligns closely with SSP climate scenarios used in climate modeling. SSP5-8.5 (~4.4°C by 2100, IPCC AR6 central estimate) clears the threshold across its full range. SSP2-4.5 (~2.7°C central estimate, with a likely range of 2.1-3.5°C) clears the threshold at its central projection. Both provide ready-made scenario pathways for physical risk assessment.
How AASB S2 Differs from IFRS S2
While AASB S2 adopts the core structure and physical risk requirements of IFRS S2 without modification, several Australian-specific provisions change how entities approach compliance.
| Dimension | IFRS S2 | AASB S2 |
|---|---|---|
| Legal status | Voluntary global baseline | Mandatory under Corporations Act 2001 |
| Enforcement | No enforcement mechanism | ASIC enforcement; penalties up to AU$16.5M or 10% turnover |
| Scenario analysis | Entity selects scenarios | Legislated: 1.5°C and well exceeding 2°C (ASIC: 2.5°C+) |
| Industry metrics | Must refer to SASB Industry Guidance | SASB Industry-Based Guidance removed as an interim measure pending AASB-developed Australian industry-based requirements (Treasury target: from 1 July 2030) |
| Standalone operation | Requires concurrent IFRS S1 | Functions standalone; IFRS S1 content in Appendix D |
| Modified liability | No equivalent | 3-year safe harbor for Scope 3, scenario analysis, transition plans |
| Assurance | Left to jurisdictions | Mandatory: limited assurance Years 1-3, reasonable from Year 4 |
| Directors’ declaration | No equivalent | Qualified (Years 1-3), full compliance (Year 4+) |
| GHG methodology | GHG Protocol (2004) | NGER reporters may use NGER methodology as alternative |
| Reporting entity | Consolidated group | Parent may choose consolidated or parent-entity-only (s292A(2)) |
| Foreign subsidiaries | Parent standard applies | Australian subsidiaries must prepare local reports lodged with ASIC |
| Physical risk requirements | Para 10, 13, 15-21, 29(c) | Substantially carry over from IFRS S2 (Paragraphs 12, 23, 28(b), 32, 37 deleted with IBG) |
Reporting Entity and Foreign Subsidiary Rules
IFRS S2 assumes consolidated group reporting. AASB S2 gives parent entities a choice under s292A(2) of the Corporations Act: report on a consolidated basis or for the parent entity alone. This flexibility matters for complex corporate structures where subsidiary-level climate risk profiles differ from the consolidated view.
Foreign companies with Australian subsidiaries that meet the Group 1, 2, or 3 size thresholds cannot rely on their parent’s climate report prepared under IFRS S2 (see worked IFRS S2 disclosure examples by sector) or another jurisdiction’s standard. Each qualifying Australian subsidiary must prepare and lodge its own climate statement with ASIC, even if the parent group already produces a consolidated climate disclosure elsewhere.
NGER (National Greenhouse and Energy Reporting) is Australia’s existing mandatory emissions reporting scheme for large industrial emitters. Entities already reporting under NGER can use their established NGER methodology for GHG calculations under AASB S2 instead of adopting the GHG Protocol, avoiding duplicate measurement systems.
December 2025 Amendments
In December 2025, the AASB issued amendments to AASB S2 addressing two areas that widen the gap from IFRS S2.
The first set of changes provides GHG measurement flexibility for financial institutions. Financed emissions measurement, which covers loans, investments, and insurance portfolios, received additional transition time recognizing how difficult it is to collect emissions data across large lending books.
The second change extends the modified liability safe harbor to cover voluntary early reporters. Entities that began publishing climate disclosures before their mandatory start date now receive the same litigation protection as those reporting on schedule. This removes what had been a disincentive for proactive compliance: under the original legislation, only mandatory reporters qualified for the safe harbor.
The physical risk disclosure requirements under AASB S2 substantially carry over from IFRS S2. Paragraphs 10, 11, 13-22, 24-31 carry over either unchanged or with limited AU-specific modifications. The Appendix A definition of “climate-related physical risks” (including the acute/chronic distinction) and Paragraph 29(c) (asset vulnerability metric) are unmodified. Paragraphs 12, 23, 28(b), 32 and 37 are deleted by the AASB; all five deletions relate to the IFRS Industry-Based Guidance, not to physical-risk identification or quantification. The key differences lie in enforcement, scenario prescriptiveness, and the supporting liability framework. For a comparison of how the UK adapted the same IFRS S2 baseline, see our guide to UK Sustainability Reporting Standards.
Modified Liability Safe Harbor
One of AASB S2’s most distinctive features is the modified liability provision, which has no direct equivalent in IFRS S2, CSRD, or the SEC Climate Rule. The safe harbor protects reporting entities, directors, and auditors from private civil litigation for specified climate disclosures during a transitional period.
| Category | Protection Period | Applies To |
|---|---|---|
| Scope 3 GHG emissions | 3 years from first reporting period | All groups |
| Scenario analysis disclosures | 3 years from first reporting period | All groups |
| Transition plan disclosures | 3 years from first reporting period | All groups |
| Forward-looking statements | 1 year (first reporting period only) | All groups |
The protection has clear boundaries. ASIC enforcement actions and criminal proceedings are not restricted by the safe harbor. Statements made outside the formal sustainability report, including marketing materials, press releases, and investor presentations, remain fully exposed to greenwashing claims. Scope 1 and 2 emissions, governance disclosures, and risk management process descriptions are also not covered.
For Group 1 entities, the modified liability window runs from 1 January 2025 through 31 December 2027. During this period, directors make a “qualified declaration” that they have taken reasonable steps to ensure compliance. From Year 4 onward, the full compliance declaration applies, equivalent to the standard financial statement declaration.
The practical effect is significant. By shielding scenario analysis and Scope 3 disclosures from shareholder class actions for three years, the safe harbor reduces the perceived litigation risk of early reporting. Companies can invest in climate risk data and build disclosure capabilities knowing that good-faith efforts during the transition period carry limited downside.
Australia’s Physical Climate Risk Exposure
Australia’s first National Climate Risk Assessment (NCRA), released in September 2025, identified 63 nationally significant climate risks across eight key systems. The assessment established 10 priority climate hazards that affect virtually every sector of the Australian economy.
| # | Hazard | Type | Key Trend |
|---|---|---|---|
| 1 | Temperature extremes | Chronic/Acute | Heatwave days could quadruple under 3°C warming |
| 2 | Drought and aridity | Chronic/Acute | More frequent, severe, and prolonged droughts projected |
| 3 | Bushfires and grassfires | Acute | Fire season extended 27 days since 1979; Black Summer cost ~AU$100B |
| 4 | Extratropical storms | Acute | Increasing intensity and interaction with other hazards |
| 5 | Convective storms (hail) | Acute | AU$3.6B in insured hail losses from 2018-2022 |
| 6 | Tropical cyclones | Acute | Decreasing frequency but increasing intensity; poleward migration |
| 7 | Riverine and flash flooding | Acute | 2022 floods caused AU$5.6B in insured losses |
| 8 | Coastal and estuarine flooding | Acute/Chronic | 18x more coastal flooding events under 3°C warming |
| 9 | Coastal erosion | Chronic | Accelerating with sea level rise; 85% of population within 50km of coast |
| 10 | Ocean warming and acidification | Chronic | Great Barrier Reef mass bleaching in 2016, 2017, 2020, 2022, 2024 |
The economic figures show why physical risk disclosure under AASB S2 is not a theoretical exercise for Australian companies. Projected property value losses reach AU$611 billion by 2050 and AU$770 billion by 2090. Worker productivity losses from heat alone are estimated at AU$135-423 billion by 2063. Government disaster recovery spending could increase sevenfold under a 3°C warming pathway.
For sectors with concentrated geographic exposure, including mining, agriculture, banking, insurance, and real estate, AASB S2’s requirement to disclose the amount and percentage of assets vulnerable to physical risks will require granular, location-level assessment rather than portfolio-wide estimates.
Continuuiti’s physical climate risk platform maps 12 climate hazards using SSP5-8.5 and SSP2-4.5 projections at ~25km resolution. The platform’s asset vulnerability quantification aligns with AASB S2 Para 29(c) requirements, and its hazard taxonomy covers 8 of the 10 NCRA priority hazards. For financial institutions subject to both AASB S2 and APRA CPG 229 prudential guidance, the same physical risk data serves both disclosure and risk management workflows.
Assurance and Enforcement
AASB S2 mandates third-party assurance from Year 1, with assurance requirements intensifying over time. The Australian Auditing and Assurance Standards Board (AUASB) approved ASSA 5000, the Australian Standard on Sustainability Assurance, on 28 January 2025.
| Period | Assurance Level | Scope |
|---|---|---|
| Year 1 | Limited assurance | Governance, strategy, Scope 1 and 2 emissions, materiality statements |
| Years 2-3 | Limited assurance | All sustainability report disclosures |
| From financial years commencing on or after 1 July 2030 | Reasonable assurance | All mandatory climate disclosures (AUASB-set effective date, applies regardless of which group the entity falls in) |
ASIC published Regulatory Guide 280 on 31 March 2025, setting out its enforcement approach. The regulator describes its supervision as “proportionate and pragmatic,” monitoring Group 1 reporters proactively and offering correction opportunities before formal enforcement action. Standard compliance expectations apply from day one, and enforcement will intensify for entities that fail to prepare required reports or engage in serious misconduct.
Directors must retain supporting documentation, including board minutes, internal analysis, and financial ledger extracts, for seven years. This documentation requirement applies from the first reporting period, creating an immediate need for structured data collection and climate risk assessment methodology documentation.
How to Prepare for AASB S2 Compliance
Whether an entity falls in Group 1 (already reporting), Group 2 (starting July 2026), or Group 3 (starting July 2027), a structured preparation approach reduces compliance burden and improves disclosure quality.
Conduct a gap assessment. Map current climate-related disclosures against AASB S2’s four pillars. Entities already reporting under TCFD can use their existing framework as a starting point, though AASB S2 requires greater specificity on scenario analysis and financial effects quantification.
Establish governance structures. Assign board-level oversight for climate risk and designate management accountability. Document governance processes early, as these disclosures are not protected by the modified liability provision and require assurance from Year 1.
Identify and classify climate risks. Catalogue physical and transition risks across all business operations. For physical risks, assess geographic concentration of assets and operations against acute hazards (floods, bushfires, cyclones) and chronic shifts (temperature, drought, sea level rise).
Build scenario analysis capability. Select appropriate climate scenarios that satisfy the legislated 1.5°C and 2.5°C+ requirements. Physical risk scenario analysis requires location-specific climate projection data at sufficient resolution to assess individual asset exposure.
AASB S2 inherits Paragraph 29(c) verbatim from IFRS S2, including the four silent definitional choices on amount, denominator, vulnerability, and scope. The Continuuiti walkthrough of Paragraph 29(c) covers each.
Quantify asset vulnerability. Para 29(c) requires the amount and percentage of assets vulnerable to physical climate risks. For companies with distributed asset portfolios, this demands systematic, location-level risk assessment rather than qualitative statements.
Prepare for assurance. Engage with assurance practitioners early. Limited assurance applies from Year 1, covering governance, strategy, and Scope 1 and 2 emissions disclosures. Reasonable assurance begins around July 2030, requiring a higher standard of evidence and documentation.
Worked Samples
AASB S2 Worked Disclosures by Sector
Complete sample disclosures for Australia’s mandatory climate-disclosure framework.
Frequently Asked Questions
What is the AASB S2 standard?
AASB S2 is Australia’s mandatory climate-related financial disclosure standard, approved in September 2024 and embedded in the Corporations Act 2001. It requires Australian companies meeting size thresholds to disclose climate-related risks, scenario analysis, and asset vulnerability metrics. ASIC enforces the standard with civil penalties of up to AU$16.5 million or 10% of annual turnover.
What is the difference between IFRS S2 and AASB S2?
AASB S2 is based on IFRS S2 but includes several Australian modifications. The main differences are: AASB S2 is legally mandatory (IFRS S2 is voluntary), scenario analysis uses legislated temperature thresholds (1.5°C and 2.5°C+), SASB industry metrics are removed, a modified liability safe harbor protects early reporters for three years, and mandatory assurance is required from Year 1. Physical risk disclosure requirements substantially carry over from IFRS S2 to AASB S2. The five paragraph-level deletions in AASB S2 (Paragraphs 12, 23, 28(b), 32 and 37) all relate to the removal of industry-based metrics, not to physical-risk identification or quantification. The acute/chronic definitional content in Appendix A and Paragraph 29(c) (the asset vulnerability metric) are unchanged.
Is AASB S2 mandatory in Australia?
Yes. AASB S2 is mandatory for Australian entities that meet size thresholds across three phased groups. Group 1 (revenue ≥ AU$500M) started reporting from January 2025, Group 2 (revenue ≥ AU$200M) from July 2026, and Group 3 (revenue ≥ AU$50M) from July 2027. Approximately 10,000 entities will be in scope across all three groups.
What are the 4 pillars of AASB S2?
AASB S2 follows the same four-pillar structure as IFRS S2: (1) Governance, covering board oversight and management accountability for climate risks; (2) Strategy, requiring risk identification, geographic concentration disclosure, and financial effects quantification; (3) Risk Management, describing processes for identifying and monitoring climate risks; and (4) Metrics and Targets, including cross-industry metrics such as the amount and percentage of assets vulnerable to physical risks.
What are the changes to AASB S2 compared to IFRS S2?
Key Australian modifications include: legislated scenario analysis requiring specific temperature thresholds (1.5°C and well exceeding 2°C), removal of SASB industry-based metrics as an interim measure (with AASB-developed Australian industry-based metrics expected from 2030), a three-year modified liability safe harbor for Scope 3, scenario analysis, and transition plan disclosures, mandatory phased assurance from limited to reasonable, directors’ declaration requirements, and the option for NGER reporters to use NGER methodology instead of GHG Protocol.
What does AASB stand for?
AASB stands for Australian Accounting Standards Board. The AASB is the independent Australian government body responsible for developing and maintaining financial reporting standards. AASB S2 (Climate-related Disclosures) and AASB S1 (General Requirements for Disclosure of Sustainability-related Financial Information) are the board’s sustainability reporting standards.
Is AASB S2 the same as ASRS?
ASRS (Australian Sustainability Reporting Standards) is the umbrella term for Australia’s sustainability disclosure framework. AASB S2 (climate-related disclosures) is the mandatory standard within ASRS. AASB S1 (general sustainability disclosures) is also part of ASRS but remains voluntary. When people refer to “ASRS requirements,” they typically mean AASB S2’s climate disclosure obligations.
What is the materiality assessment under AASB S2?
AASB S2 uses the same materiality definition as IFRS S2: information is material if omitting or misstating it could reasonably influence investor decisions. Group 3 entities have an additional option under s296B of the Corporations Act to lodge a “no material climate risks” statement if they determine climate risks are not material to their operations. This assessment must be documented and defensible.
Key Takeaways
AASB S2 moves climate disclosure from voluntary to mandatory for Australian companies, with legislated scenarios, enforced penalties, and phased assurance requirements. The standard’s physical risk provisions, identical to IFRS S2, demand granular asset-level data that goes beyond what most entities have prepared to date. Group 2 and 3 entities still have time to build the governance structures, data pipelines, and scenario analysis capabilities needed for compliance, but the three-year modified liability window also means the cost of starting early has never been lower.
