IFRS Sustainability Disclosure Standards S1/S2 in Taiwan: Six Things the Board Needs to Know

In June 2023, the IFRS Foundation officially issued IFRS S1 General Requirements for Disclosure of Sustainability-related Financial Information and IFRS S2 Climate-related Disclosures, establishing a unified baseline for global corporate sustainability reporting. Taiwan's Financial Supervisory Commission (FSC) promptly announced a phased adoption timeline, requiring listed companies to progressively comply based on their scale. This is not an incremental administrative compliance exercise, but a fundamental restructuring of the underlying logic of corporate governance -- sustainability risk has become a core component of financial reporting rather than an ancillary social responsibility statement. For every director of a listed company, understanding the substance of IFRS S1/S2 is no longer optional professional development, but a basic obligation of fiduciary duty. This article takes a practice-oriented perspective to analyze the six key issues that boards need to master during this institutional transformation.

I. What Exactly Do IFRS S1 and S2 Require

IFRS S1 is a "general standard" that requires companies to disclose all material sustainability-related risks and opportunities that may affect the enterprise's long-term cash flows, financing channels, and enterprise value. Its core concepts derive from the TCFD (Task Force on Climate-related Financial Disclosures) framework, requiring disclosure across four pillars: Governance, Strategy, Risk Management, and Metrics and Targets.^[1]

IFRS S2 is the climate-specific chapter of S1, further requiring companies to distinguish between "physical risks" (such as the impact of extreme weather events on assets) and "transition risks" (such as the impact of carbon pricing and green regulations on business models), and to incorporate stress tests under both 1.5°C and 2°C global warming scenarios in their scenario analyses. S2 also requires disclosure of Scope 1, Scope 2, and "material" Scope 3 greenhouse gas emission data, meaning that supply chain carbon footprint management has for the first time become part of financial disclosure obligations.^[2]

The shared core of both standards is the conceptual shift toward "double materiality" -- companies must not only disclose how sustainability issues affect the enterprise itself (financial materiality), but also assess how the enterprise's activities affect the external environment and society (impact materiality). This shift marks an institutional advance in corporate governance from "shareholder primacy" toward "stakeholder capitalism."

II. The FSC's Phased Implementation Timeline and Compliance Pressure

At the end of 2023, the FSC published the "Listed Companies Sustainable Development Action Plan (2023 Revised Edition)," setting out a clear roadmap for aligning with IFRS S1/S2. Under the current plan, listed companies with paid-in capital of NT$10 billion or more are required to prepare climate-related financial disclosure reports compliant with IFRS S2 from 2026 onward, while other listed companies will be phased in by scale through 2028.^[3]

This timeline may appear gradual, but the actual preparation work is far more demanding than imagined. Collecting Scope 3 emission data requires collaboration with dozens or even hundreds of suppliers; scenario analysis demands financial modeling capabilities; and third-party assurance requirements mean companies must build data governance infrastructure that can withstand external audit. According to research by the International Federation of Accountants (IFAC), the average time required globally for companies to complete IFRS S1/S2 preparation exceeds 18 months.^[4]

For boards, the more critical issue is the "compliance window": the quality of the first year's disclosure will be scrutinized intensely by capital markets. Investors, ESG rating agencies, and even lending banks' credit departments will all use the first IFRS S1/S2-compliant report as the benchmark for assessing a company's sustainability governance maturity. A hastily assembled disclosure not only fails to reduce risk but may actually trigger reputational crises and legal liability.

III. Comparison with EU CSRD and U.S. SEC Climate Rules

Understanding the significance of IFRS S1/S2 requires placing it within the context of global sustainability disclosure regulatory competition. The EU's Corporate Sustainability Reporting Directive (CSRD), phased in from 2024, requires EU companies to disclose under the European Sustainability Reporting Standards (ESRS), which are far broader in scope than IFRS S2, covering biodiversity, supply chain human rights, social metrics, and more, with mandatory "double materiality" assessment.^[5]

The U.S. Securities and Exchange Commission (SEC) adopted climate-related disclosure rules in March 2024, requiring U.S.-listed companies to disclose material climate risks, emission data, and climate-related financial impacts. However, following multiple legal challenges, implementation of some provisions has been stayed. By comparison, IFRS S1/S2 is designed to balance "usefulness to investors" with "implementation feasibility," and is regarded as the sustainability disclosure standard with the broadest global consensus.^[6]

For Taiwanese companies, this global regulatory landscape has direct practical implications: Taiwanese companies with significant operations in the EU market (such as supply chain manufacturers) may be indirectly bound by CSRD supply chain provisions; companies listed in the U.S. or with U.S. institutional investors also need to monitor developments in SEC rules. A company's sustainability disclosure strategy must navigate toward the optimal path within this multi-regulatory framework.

IV. The Expansion of Fiduciary Duty: Sustainability Risk Becomes Central to Directors' Obligations

The deepest impact of IFRS S1/S2 on corporate governance is the explicit incorporation of "oversight of sustainability risk" into the scope of directors' fiduciary duties. The "Governance" pillar of S1 requires companies to disclose: how the board oversees sustainability-related risks and opportunities; which committee or individual director bears oversight responsibility for sustainability issues; how the board's assessment and decision-making processes incorporate sustainability considerations; and how management's performance incentives are linked to sustainability targets.^[7]

These disclosure requirements effectively constitute a new normative framework for director conduct. If a company discloses in its IFRS S1/S2 report that "the board reviews climate risk quarterly," but in practice the board has never seriously discussed climate issues, this is not merely misleading disclosure -- it may constitute fraudulent misrepresentation to investors. Conversely, boards that proactively build sustainability governance capabilities will command an increasingly significant valuation premium in capital markets -- MSCI research consistently shows that companies with higher ESG governance scores exhibit statistically significant advantages in long-term stock price performance.

V. Common Pitfalls in First-Year Disclosure

Based on international practice observations, there are five categories of pitfalls most commonly encountered by companies during their first year of IFRS S1/S2 compliance that boards should be particularly vigilant about.

Materiality assessments become perfunctory. Many companies tend to list all sustainability issues as "material" to avoid the risk of omission, but this actually dilutes the information quality of disclosures. What investors need is a judicious materiality assessment, not an exhaustive checklist.^[8]

Scenario analysis lacks financial quantification. IFRS S2 requires scenario analysis results to be linked to financial impacts, but many companies' scenario analyses remain at the qualitative description level, failing to answer questions investors care about most, such as "Under a 1.5°C scenario, what is our asset impairment risk?"

Scope 3 data quality is insufficient. Collecting supply chain emission data involves extensive primary data acquisition, and many companies over-rely on proxy estimates based on industry averages, resulting in data precision that cannot pass third-party assurance.

Governance disclosures are disconnected from actual governance. If the committee structures, review frequencies, and decision-making processes described in reports cannot be corroborated by internal documents such as board meeting minutes, companies face extremely high legal risk.

Cross-departmental coordination mechanisms are lacking. IFRS S1/S2 data spans finance, risk management, supply chain, legal, and multiple other departments. Without a robust cross-departmental coordination mechanism, disclosure quality will be difficult to ensure.^[9]

VI. A Six-Point Action Checklist for the Board

Translating the above analysis into specific actions that individual directors can take, this article offers the following six recommendations:

First, designate the responsible committee for sustainability governance. The board should clearly designate the audit committee, risk management committee, or an independently established sustainability committee as the unit primarily responsible for IFRS S1/S2 disclosure, ensuring clear accountability and incorporating sustainability issues into that committee's annual work plan.

Second, require management to submit materiality assessment results. In the first year of alignment, the board should require management to complete a materiality assessment conforming to IFRS S1 standards, and to present and explain the assessment methodology, stakeholder consultation process, and final results to the board for substantive deliberation rather than pro forma approval.

Third, build the capability to link climate scenario analysis to financial outcomes. The board should require the CFO and CSO/CSRO to jointly establish a financial quantification framework for climate scenario analysis, ensuring that scenario analysis results are reflected in capital expenditure planning, asset impairment testing, and long-term strategic planning.^[10]

Fourth, launch a supply chain carbon disclosure program. For companies where Scope 3 emissions represent a significant proportion, the board should require management to develop a supply chain carbon disclosure roadmap, including the methodology for data collection, priority supplier categories, and annual targets for improving data precision.

Fifth, incorporate sustainability performance into executive compensation design. S1's governance disclosure requirements call for companies to explain how management compensation is linked to sustainability targets. The board's compensation committee should proactively design specific plans to integrate climate targets and ESG metrics into executive long-term incentive plans (LTIPs), rather than passively waiting for disclosure requirements to force reform.

Sixth, invest in data infrastructure for sustainability disclosure. The quality of IFRS S1/S2 disclosure ultimately depends on the integrity of data systems. The board should approve the necessary capital investment to build sustainability data collection, management, and verification systems that meet assurance standards, treating this as governance infrastructure of equal importance to financial reporting systems.^[11]

Taiwan's alignment with IFRS S1/S2 represents a paradigm shift from "non-financial information disclosure" to "sustainability financial reporting." For boards, the most dangerous misconception is to treat it as yet another compliance burden and respond passively. The correct perspective is this: it is an institutional opportunity to redefine long-term corporate competitiveness -- companies that are first to build high-quality sustainability disclosure capabilities will gain first-mover advantages across multiple dimensions including capital markets, customer relationships, and talent attraction.