Sustainability reporting is entering a new phase. With the introduction of IFRS S1 and IFRS S2 by the International Sustainability Standards Board (ISSB), climate and other sustainability‑related disclosures are moving from standalone reports into an integrated, investor‑grade framework aligned with financial reporting. For finance, risk and sustainability teams, this represents a shift in expectations, processes and accountability.
From separate sustainability reports to a unified baseline
For many years, companies have published sustainability or ESG reports based on a mix of voluntary frameworks and bespoke metrics. While helpful, these reports often varied widely in scope, detail and quality, making it difficult for investors to compare companies and assess the financial implications of ESG issues.
The ISSB was created under the IFRS Foundation to address this fragmentation by developing a global baseline of sustainability disclosure standards. IFRS S1 sets out general requirements for sustainability‑related financial information, and IFRS S2 focuses specifically on climate‑related disclosures. Both are designed with investors and creditors as their primary audience.
Key features include:
· A focus on information that is material to enterprise value.
· Alignment with familiar pillars: governance, strategy, risk management, and metrics and targets.
· An expectation that sustainability‑related information is prepared with similar rigour to financial information, and that it connects clearly to IFRS financial statements.
For many jurisdictions, these standards form the reference point for new or updated sustainability reporting requirements.
What IFRS S1 and S2 require in practice
IFRS S1 and S2 raise the bar in several areas:
· Clarity on governance and responsibilities – Companies must explain who is accountable for sustainability‑related risks and opportunities, how information flows to decision‑makers and how frequently topics are discussed at board and executive level.
· Integration with strategy and business models – Disclosures must describe how sustainability‑related risks and opportunities affect business models, strategy and financial planning, including over the short, medium and long term.
· Structured discussion of risk management – Organisations need to show how sustainability‑related risks are identified, assessed and managed, and how these processes connect to existing risk frameworks.
· Decision‑useful metrics and targets – Companies must disclose metrics and targets that reflect their most material sustainability‑related risks and opportunities, including greenhouse gas emissions and transition plans under IFRS S2.
The emphasis is on connecting sustainability topics to financial performance and risk, not simply listing initiatives or policies.
Implications for ESG reporting strategy
For organisations that already have ESG reports, IFRS S1 and S2 are not just another template; they change how ESG information is expected to be produced and used:
· From narrative led to data driven – Disclosures must be underpinned by consistent, verifiable data and assumptions that can withstand scrutiny from investors, regulators and, over time, assurance providers.
· From parallel processes to integrated workflows – Sustainability data collection, scenario analysis and risk assessment need to be embedded into the same planning and reporting cycles used by finance and risk functions, rather than running entirely on separate timelines.
· From ESG only audiences to capital markets – Content should be tailored to the needs of investors and lenders, focusing on financial implications, resilience and capital allocation, not just broader stakeholder interests.
This shift will require closer collaboration between sustainability, finance, risk, internal audit and investor relations teams.
The finance–sustainability partnership
To respond effectively to IFRS S1 and S2, many organisations will need to rethink internal roles and interfaces:
· Finance teams bring expertise in controls, measurement, consolidation and external reporting.
· Sustainability teams bring subject‑matter knowledge on climate, nature, social topics and emerging regulation.
· Risk teams help integrate sustainability topics into enterprise risk management and scenario analysis.
An effective ESG reporting strategy under IFRS S1 and S2 depends on these functions working together to design:
· A common data model and taxonomy for financial and sustainability information.
· Processes and controls that ensure completeness, accuracy and consistency.
· Governance structures that clarify who owns which parts of the disclosure and who signs off.
Without this alignment, organisations risk producing sustainability disclosures that are disconnected from financial narratives or difficult to support under assurance.
Positioning for future developments
IFRS S1 and S2 are likely to be the starting point rather than the end state. Over time, additional sustainability‑related standards are expected to cover other topics such as nature, human capital and broader social issues. Many regulators are also signalling plans to incorporate ISSB standards into local requirements, especially for listed and large companies.
For ESG consulting firms and corporate sustainability teams, this creates both challenges and opportunities:
· The challenge is to upgrade reporting processes, data infrastructure and governance to meet higher expectations.
· The opportunity is to help organisations build integrated reporting capabilities that connect sustainability and financial performance in a credible, decision‑useful way.
Organisations that move early will be better placed to respond to investor questions, meet regulatory timelines and use sustainability information to support strategic decision‑making rather than treating it purely as a compliance task.