AASB S2: Australia’s Mandatory Climate Reporting Explained
Australia has introduced AASB S2, the country’s mandatory climate reporting standard that fundamentally changes how organisations disclose climate-related risks and opportunities. AASB S2 compliance is now embedded in the Corporations Act 2001 as a legal requirement for thousands of Australian entities — making climate reporting a core financial obligation rather than a voluntary initiative. Embedded within the Corporations Act 2001, AASB S2 compliance is now a legal requirement for thousands of Australian entities, marking climate reporting as a core financial obligation rather than a voluntary initiative.
For sustainability professionals, understanding what triggers AASB S2 obligations is critical. This guide breaks down the thresholds, timelines, and requirements that determine whether your organisation must comply with the Australian Sustainability Reporting Standards (ASRS).
AASB S2 explained
AASB S2 is Australia’s mandatory standard for climate-related financial disclosures, developed by the Australian Accounting Standards Board in alignment with IFRS S2 Climate-related Disclosures, issued by the International Sustainability Standards Board (ISSB). Unlike voluntary reporting, AASB S2 carries legal force under the Corporations Act 2001.
The standard requires organisations to disclose climate-related information that could affect their cash flows, access to finance, or cost of capital. This includes reporting across four key pillars: Governance, Strategy, Risk Management, and Metrics and Targets.
For Group 1 entities with annual reporting periods beginning on or after 1st January 2025, the obligation to prepare sustainability reports alongside their financial statements is now in effect, making climate disclosures legally equivalent to financial reporting.
AASB S1 vs AASB S2
AASB S2 sits alongside AASB S1 (General Requirements for Disclosure of Sustainability-related Financial Information) as part of Australia’s new sustainability reporting framework. While AASB S1 establishes the overarching principles for all sustainability disclosures, AASB S2 deals specifically with climate-related risks and opportunities. In practice, most entities will need to consider both standards together — AASB S1 sets the “how to report” rules and AASB S2 sets the “what to report on climate” rules.
AASB S2 reporting thresholds and eligibility
AASB S2 compliance is phased across three groups based on entity size and emissions profile.
Group 1 (first annual reporting period beginning on or after 1 Jan 2025)
Your organisation falls into Group 1 if it meets at least two of these three criteria:
- Consolidated revenue of $500 million or more
- Consolidated gross assets of $1 billion or more
- 500 or more employees
Group 1 also includes entities meeting the National Greenhouse and Energy Reporting (NGER) publication threshold.
Group 2 (first annual reporting period beginning on or after 1 July 2026)
Your organisation falls into Group 2 if it meets at least two of these three criteria:
- Consolidated revenue of $200 million or more
- Consolidated gross assets of $500 million or more
- 250 or more employees
Group 2 also includes NGER reporters not in Group 1, plus asset owners (superannuation funds, managed investment schemes) with $5 billion or more in assets under management.
Group 3 (first annual reporting period beginning on or after 1 July 2027)
Your organisation falls into Group 3 if it meets at least two of these three criteria:
- Consolidated revenue of $50 million or more
- Consolidated gross assets of $25 million or more
- 100 or more employees
Group 3 entities can claim a materiality exemption if they have no material climate-related risks, but this requires documented justification with director sign-off and auditor verification.
See our dedicated AASB S2 Group 2 guide for full details on thresholds, disclosure requirements and how to prepare.
What must you disclose under AASB S2?
Once triggered, organisations must prepare an annual sustainability report addressing four core areas based on the Task Force on Climate-related Financial Disclosures (TCFD) framework.
Governance
Disclose how your board and management oversee climate-related risks and opportunities, including oversight structures and integration into decision-making processes.
Strategy
Report material climate-related risks and opportunities, their financial effects, and your organisation’s resilience. This includes mandatory climate scenario analysis using at least two scenarios: a 1.5 degrees pathway and well exceeding 2 degrees. You must also disclose any Climate Transition Plans outlining emission reduction targets and timelines.
Risk management
Describe your processes for identifying, assessing, and monitoring climate risks, distinguishing between physical risks (extreme weather) and transition risks (policy changes, technology shifts).
Metrics and targets
Report Scope 1 and 2 emissions in Year 1, with Scope 3 emissions mandatory from Year 2. Additional metrics include capital expenditure on climate initiatives, internal carbon pricing, and climate considerations in executive remuneration.
AASB S2 and Scope 3: the biggest data challenge
Scope 3 emissions, indirect emissions throughout your value chain, represent the biggest data challenge. For many companies, Scope 3 accounts for over 70% of total emissions.
The one-year relief period provides breathing room, but start collecting data immediately. This involves engaging suppliers, establishing data-sharing protocols, and implementing tracking systems aligned with the Greenhouse Gas Protocol methodologies.
AASB S2 assurance and audit requirements
A critical feature of AASB S2 is progressive assurance. While mandatory reporting commenced for reporting periods beginning in 2025, full reasonable assurance becomes mandatory from July 1, 2030, matching the scrutiny applied to financial statements.
The Auditing and Assurance Standards Board (AUASB) has released ASSA 5000 and ASSA 5010 to guide this transition. Your sustainability data must be audit-ready from day one, with systems and controls that can withstand third-party verification.
AASB S2 transition relief: what’s available
The Australian government has built in several transition relief provisions to ease the shift to mandatory reporting:
- Scope 3 one-year deferral: Group 1 entities are not required to report Scope 3 emissions in their first reporting year
- Director liability protection: A three-year safe harbour applies to forward-looking climate statements, phasing out from July 2028
- Modified disclosure: Some smaller Group 1 entities may qualify for modified disclosure requirements in early years — check ASIC’s guidance for current thresholds
- Comparatives relief: First-year reporters are not required to include comparative period data
Penalties for non-compliance
AASB S2 carries serious penalties mirroring financial reporting violations. False or misleading climate statements could result in fines up to $15 million or 10% of annual turnover, whichever is greater. Directors can be held personally liable.
ASIC’s Regulatory Guide 280 outlines enforcement expectations. After a three-year transition period, liability protections for directors phase out, increasing the need for strong governance and accurate data management.
What if you’re below the thresholds?
Even organisations below reporting thresholds will feel AASB S2’s impact. Large companies will require Scope 3 data from suppliers and partners, creating “shadow regulation” where emissions data becomes essential for supply chain participation.
The government’s “climate first, but not only” approach signals that mandatory reporting may expand to other sustainability topics like biodiversity and water usage in the future.
Five practical steps to assess your obligations
- Confirm Chapter 2M status: Determine if you prepare financial reports under Chapter 2M of the Corporations Act 2001
- Calculate your thresholds: Assess consolidated revenue, gross assets, and employee numbers. You only need two of three criteria
- Check NGER status: NGER reporters may be automatically captured regardless of size
- Identify your timeline: Based on your group, determine your first mandatory reporting period
- Assess materiality: Group 3 entities should formally assess whether climate risks are material to their business
How eco-shaper simplifies AASB S2 compliance
Navigating mandatory climate reporting doesn’t have to be complex. eco-shaper provides comprehensive solutions specifically designed for AASB S2 compliance:
- Fully automated Scope 3 calculations aligned with AASB S2 requirements
- Australia’s most comprehensive regional emissions database with location-specific factors
- Real-time emissions tracking across all three scopes
- Dedicated supplier engagement portal that enables your supply chain to calculate and share emissions data directly, solving the Scope 3 challenge without spreadsheets or manual data requests
- Automated AASB S2-compliant reporting with built-in audit trails
- Climate scenario analysis tools for testing strategic resilience
- Seamless integration
Our university-audited algorithms ensure accuracy while our zero-touch platform minimises manual effort. The supplier engagement module is what truly sets eco-shaper apart, by giving your suppliers their own carbon calculator, you get reliable Scope 3 data while helping your entire value chain meet evolving sustainability expectations. Whether you’re a Group 1 entity beginning your first reporting cycle or preparing for future compliance, eco-shaper transforms reporting from a burden into a strategic advantage.
Is mandatory climate reporting in Australia right for your business?
Mandatory climate reporting in Australia is no longer a question of if — it’s a question of when. Even if your organisation falls below the current Group 1 or Group 2 thresholds, your largest customers and supply chain partners almost certainly do not. Preparing early for AASB S2 puts you ahead of the compliance curve and positions your business as a trusted partner to enterprises that need reliable Scope 3 data from their suppliers.
Take action now
Australia’s mandatory climate reporting regime represents a fundamental shift in corporate accountability. Early preparation is essential. Organisations should immediately begin building capabilities, establishing data systems, and educating leadership teams.
Research shows early TCFD reporters experience lower capital costs, improved investor confidence, and enhanced operational efficiency. Beyond compliance, AASB S2 offers opportunities to embed climate considerations into strategy and identify risks before they materialise.
Ready to streamline your compliance?
eco-shaper combines 25 years of sustainability expertise with cutting-edge AI to make climate reporting straightforward and defensible. Don’t leave AASB S2 compliance to chance.
If you’re looking for a platform to manage your company reporting obligations, see how eco-shaper’s company reporting tool works.
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At eco-shaper, we drive action on climate change and streamline carbon footprinting. For example, we can help calculate emissions across the entire ecosystem that companies work across and produce automated reporting based on outcomes. Contact us to be part of our research group on
