Wojciech Szewczak, head of strategy and advisory, and Sarthak Ganpule, senior consultant, AESG, explore how the International Sustainability Standards Board’s (ISSB) standards of IFRS S1 and S2 are reshaping sustainability disclosure, climate risk governance, and investor expectations, and what this means for organisations across the globe.
Sustainability reporting is entering a new phase of global maturity. What was once largely considered a voluntary ESG communication exercise is increasingly becoming part of mainstream financial disclosure and enterprise risk management. Investors, regulators, lenders, insurers, and other stakeholders are demanding more consistent, comparable, and decision-useful sustainability information that can be integrated into financial analysis and capital allocation decisions.
Over the past decade, organisations have navigated a fragmented reporting landscape shaped by multiple voluntary frameworks, GRI, SASB, CDP, and the Task Force on Climate-related Financial Disclosures (TCFD).
While these frameworks significantly advanced corporate sustainability reporting, they created inconsistencies in disclosure practices, limiting comparability across sectors and jurisdictions.
The establishment of the ISSB under the IFRS Foundation represents a major effort to address this challenge. IFRS S1 and IFRS S2 are designed to create a globally consistent baseline for sustainability-related financial disclosures, enabling investors and markets to better understand how sustainability and climate-related risks affect enterprise value.
What is IFRS S1 and S2?
IFRS S1 and IFRS S2 are the first sustainability disclosure standards issued by the ISSB. Together they establish a framework for organisations to disclose sustainability-related financial information in a consistent, comparable, and investor-focused manner.
The standards work together: IFRS S1 establishes the overall disclosure framework, while IFRS S2 provides the first topic-specific standard focused on climate. Transitional relief in the first year allows organisations to focus primarily on climate-related disclosures, supporting a phased approach.
The four pillars
Both standards are structured around four core pillars from the TCFD framework. These pillars embed sustainability-related risks and opportunities into core business decision-making, making climate and ESG governance a strategic priority at board level.
1. Governance
Boards and senior management must disclose how they oversee sustainability-related risks and opportunities including governance structures, accountability mechanisms, and how sustainability is integrated into strategic decision-making.
2. Strategy
Organisations must explain how sustainability and climate-related risks affect business models, value chains, and long-term strategy, including resilience under different climate scenarios and adaptation to evolving market conditions.
3. Risk Management
Sustainability risks must be integrated into enterprise risk management (ERM) frameworks, not handled by standalone ESG functions. Disclosure must cover how risks are identified, assessed, prioritised, and managed.
4. Metrics & Targets
Relevant climate and sustainability metrics must be reported, including Scope 1, 2, and 3 GHG emissions aligned with the GHG Protocol, plus climate targets, transition plans, and performance indicators.
Who needs to comply
Globally, adoption timelines vary by jurisdiction. However, listed companies, financial institutions, multinational organisations, and entities with significant investor exposure are expected to be among the first groups impacted. In many markets, regulators are either adopting the ISSB standards or evaluating how they can be incorporated into national frameworks.
Importantly, the impact of IFRS S1 and S2 extends well beyond directly regulated entities. Private companies, subsidiaries of multinationals, and organisations embedded in complex global value chains, face growing indirect pressure through:
- Investor due diligence and ESG screening in capital allocation decisions
- Supply chain and procurement requirements from larger international partners
- Lender expectations and sustainability-linked financing covenants
- Multinational group reporting obligations from parent companies
- Institutional investor stewardship expectations and engagement policies
For many organisations, alignment with IFRS Sustainability Disclosure Standards is increasingly becoming a strategic business consideration, not solely a compliance requirement. Early adoption signals governance maturity, improves investor confidence, and supports access to sustainability-linked capital.
How to prepare
Preparing for IFRS S1 and IFRS S2 globally requires moving beyond traditional sustainability reporting toward more integrated, governance-driven, and financially connected disclosure. Regardless of jurisdiction, sector, or current maturity level, the following steps provide a practical framework for readiness.
The real challenge
Many organisations globally already have sustainability reporting processes. However, these systems often require significant development to meet the more rigorous requirements of IFRS S1 and S2.
The shift is less about creating new disclosures, and more about strengthening reporting controls, methodology discipline, and integration between sustainability, finance, risk, and operations.
Early mover advantage
Climate risk is no longer merely an environmental or reputational issue, it is a financial and strategic one. Climate-related economic costs have more than doubled over the past 20 years, and further warming is expected to create material costs within the next two decades. Organisations that proactively address climate-related financial disclosure will be better positioned across four dimensions:
Financial resilience
Demonstrates ROI on transition projects, strengthens investor relations, and improves access to capital through sustainability-linked finance. Reduces risk of stranded assets and creates long-term cost savings.
Operational stability
Integrating climate risk, technology readiness, and supplier strategies into planning ensures projects are feasible and deliverable – improving supply chain resilience and reducing operational risk.
Growth and competitiveness
Early movers capture market share, strengthen customer relationships, and access new revenue streams while competitors remain focused on compliance costs.
Strategic alignment
Climate action embedded at all levels of decision-making reinforces accountability and secures cross-functional buy-in, from board to business units.
AESG supports organisations across multiple sectors and geographies in navigating the transition from traditional ESG reporting toward more integrated sustainability-related financial disclosure aligned with IFRS S1 and S2. To learn more, visit https://aesg.com/
