CSRD + IFRS S1/S2 for Thai Subsidiaries of EU Groups (FY 2026)

**CSRD (Directive (EU) 2022/2464)** applies at the **EU consolidated** level. The EU parent reports the whole group — including Thai subsidiaries — when those subsidiaries are **material** to the impacts, risks, or opportunities (IROs) the group must disclose under ESRS.

**Materiality threshold is qualitative, not quantitative.** A Thai factory representing 4 % of revenue but 60 % of group Scope 1 emissions is material on impact even though immaterial on financial size.

**Article 8 of the EU Taxonomy Regulation** also cascades: turnover, CapEx, and OpEx alignment must be computed at consolidated level including the Thai operations.

**Impact materiality** — the actual or potential effect of the subsidiary's activities on people and the environment. Thai factory effluent into the Bang Pakong river: material on impact regardless of finance.

**Financial materiality** — the effect of sustainability risks / opportunities on the group's financial position. Drought-driven water-allocation cut by RID = financial materiality for a Thai beverage operation.

**Both gates → in scope.** Either gate → in scope. The double-materiality assessment is now an auditable artefact — auditors will challenge thin or self-serving analyses.

**ESRS E1 (Climate change):** Scope 1 + 2 + material Scope 3, transition plan alignment with 1.5 °C, internal carbon price, energy mix, climate-scenario analysis (TCFD scenarios 1.5 °C, 2 °C, 3 °C).

**ESRS E2–E5:** Pollution, water + marine resources, biodiversity, circular-economy material flows.

**ESRS S1 (Own workforce):** headcount by type, % collective bargaining coverage, gender pay gap (rarely reported in Thailand pre-2024 — this is a major data-collection lift), training hours, work-related fatalities + injuries.

**ESRS S2 (Workers in value chain):** Thailand-specific risks — migrant labour (Myanmar, Cambodia, Lao PDR), recruitment-fee due diligence, ILO Convention 29 + 105 forced-labour exposure, IUU fishing in seafood supply chain.

**ESRS G1 (Business conduct):** anti-corruption policies, training coverage, % suppliers subject to ESG due diligence, payment-to-suppliers practice (relevant under EU Late Payments Regulation).

**IFRS S1 (General Requirements)** and **IFRS S2 (Climate-related Disclosures)**, issued by ISSB in June 2023, focus on financial materiality (single materiality, investor-facing).

**SEC Thailand** has signalled voluntary adoption from FY 2026 with phased mandatory adoption for SET-listed PIEs from FY 2028. Disclosures land in the One Report (replacing 56-1).

**Interoperability with ESRS:** the EFRAG–ISSB joint guidance (May 2024) maps ESRS E1 to IFRS S2 line by line. A subsidiary producing the EU parent's ESRS dataset largely already has the IFRS S2 dataset — but the two governance + risk-narrative templates differ.

**Practical recommendation:** build the ESRS dataset to ESRS detail (always the superset); cross-tag to IFRS S1/S2 for SEC One Report use; never run two parallel data systems.

**Year 1:** limited assurance mandatory (similar effort to a SOC 2 Type 1 — auditor asks, evidence shown, no audit-style independent testing).

**By FY 2028 (Commission target):** reasonable assurance mandatory (audit-grade — independent testing of underlying data, controls, methodology).

**Thai subsidiary impact:** the EU parent's auditor (typically a Big Four) will instruct a Thai member firm to perform substantive testing on Thai-sourced ESRS data. Budget THB 2–6 M per subsidiary for the first reasonable-assurance cycle.

**Document-retention obligation:** 5 years after the reporting year; certain documents (transition plan, climate-scenario assumptions) longer per individual ESRS retention requirements.

**Intra-group data transfer + processing agreement** — sustainability data crossing to the EU parent involves PDPA + GDPR. Article 28 controller-processor agreement is mandatory.

**Whistleblower channel** to receive ESRS S1 + G1 reports — must comply with EU Whistleblower Directive (2019/1937) standards + Thai Witness Protection Act.

**Director's certification** of the data submission packet to the parent — signed before a Notarial Services Attorney to create evidential weight if data is later challenged.

**Power of Attorney** to EU parent's group sustainability office to file consolidated ESRS report on the subsidiary's behalf — notarised + Apostilled (HCCH (in force for Thailand 28 February 2027)).

**Anti-greenwashing review** of all subsidiary marketing referencing ESG performance — EU Empowering Consumers Directive 2024/825 imposes fines up to 4 % of national turnover for unsubstantiated environmental claims.