The EU disclosure regime after Omnibus I. Narrower, simpler, still real.

The Corporate Sustainability Reporting Directive (CSRD) is the EU’s mandatory sustainability disclosure regime, operationalised through the European Sustainability Reporting Standards (ESRS) developed by EFRAG. Amendment Directive (EU) 2026/470 — the “Omnibus I” simplification package — entered into force 18 March 2026. Two substantive changes: (1) scope thresholds raised to 1,000+ employees AND €450M+ net turnover, removing approximately 80% of originally captured undertakings; (2) ESRS data points cut from ~1,073 to approximately 320 in EFRAG’s draft simplified standards (3 December 2025), with European Commission Delegated Act expected September 2026. What did not change: double materiality remains mandatory; limited assurance remains required; ESEF/XBRL digital filing remains required. The Omnibus is precision-targeting, not deregulation.

Honest scoping: Nataree Aussapim anchors Othello’s consultative CSRD/ESRS engagement work as EU Disclosure Lead — it is not an EU-conferred practitioner credential. CSRD/ESRS does not operate through individual practitioner certifications; EFRAG develops the standards, the European Commission adopts them via Delegated Acts, and national regulators supervise. What Othello does: prepares Thai-owned EU subsidiaries and Thai-listed groups with EU consolidation to file CSRD-compliant ESRS disclosures — scope determination, double-materiality assessment, ESRS gap analysis, data infrastructure build, disclosure drafting, ESEF preparation. What Othello does not do: claim EU-conferred practitioner certification; provide the limited-assurance opinion (which sits with separately engaged assurance providers under ISAE 3000); operate as a Member State competent authority. The credential category is “applied competence in CSRD/ESRS compliance preparation, anchored by Nataree Aussapim” — verifiable through engagement letters and outputs under NDA.

Three categories: (1) Thai-owned EU subsidiaries meeting the post-Omnibus thresholds (1,000+ employees AND €450M+ net turnover) — these report directly under CSRD via the EU subsidiary. (2) Thai-listed groups with consolidated EU operations — the EU subsidiary reports if it meets thresholds; group-level disclosure may also be required via the parent’s CSRD obligations if any EU subsidiary is in scope. (3) Non-EU groups with €450M+ turnover generated in the EU — report on FY2028 in 2029 under a separate non-EU group regime. Many Thai-owned EU subsidiaries that were previously in CSRD scope are now out of scope if they fall below the new thresholds; Wave 1 companies that no longer meet thresholds are exempted from FY2025-2026 reporting subject to national transposition. Othello’s first-stage scope determination work is decisive here.

Double materiality requires reporters to disclose two distinct dimensions of sustainability information: impact materiality (the company’s impacts on people and environment, including via the value chain), and financial materiality (sustainability matters affecting the company’s enterprise value). The two assessments produce overlapping but distinct material-topic lists — the company reports on the union of both. ESRS 1 codifies the double-materiality methodology; ESRS 2 requires disclosure of the assessment process and outcomes. Double materiality is the substantive feature distinguishing CSRD from financial-materiality-only regimes like IFRS S1/S2. Omnibus I retained double materiality unchanged; the political pressure to remove it was rejected. The methodology aligns with GRI’s impact-materiality process at the impact-materiality side; aligns with IFRS S2 at the financial-materiality side; both halves are required for CSRD compliance.

EFRAG and GRI signed a formal cooperation agreement in 2023, with published joint mapping documents (the EFRAG-GRI Joint Statement of Interoperability and detailed mapping tables). The mapping identifies, for each ESRS topical standard, the corresponding GRI Standard disclosures that satisfy the ESRS data point. For Thai-owned EU subsidiaries already publishing GRI 2021 reports, the cross-mapping reduces CSRD data-collection burden by typically 60-75% on the substantive content side. The remaining 25-40% covers ESRS-specific disclosures not captured by GRI (notably some ESRS 2 governance disclosures, ESRS E1 alignment with IFRS S2, and ESRS S1/S2/S3/S4 social disclosures with EU-specific framing). The interoperability is the most commercially substantive feature of the post-Omnibus CSRD compliance scoping, particularly for Thai-listed groups where the parent company’s GRI report can substantially feed the EU subsidiary’s CSRD compliance.

The Omnibus introduced a value-chain disclosure cap to protect SMEs from disproportionate data requests. Companies with fewer than 1,000 employees in a reporting company’s value chain are protected from data requests exceeding the scope of the VSME (Voluntary Sustainability reporting standard for SMEs and other non-listed undertakings) voluntary standard developed by EFRAG. For Thai SME suppliers to EU buyers in CSRD scope, this means the data requests they receive from EU buyers cannot exceed VSME scope — a substantially lighter load than full ESRS reporting. VSME is structurally proportionate: a smaller set of core disclosures, voluntary expansion modules, simpler materiality methodology. The cap operates by reference to the supplier’s own size, not the buyer’s reporting obligation — meaning Thai SME suppliers retain protection even where their EU buyers face full ESRS disclosure.

CSRD and IFRS S1/S2 operate in different jurisdictions with substantive interoperability at the climate level. ESRS E1 (Climate Change) is aligned with IFRS S2 (Climate-related Disclosures): both use TCFD four-pillar architecture; both require Scope 1+2+3 GHG; both require scenario analysis. EFRAG and the ISSB published a joint interoperability statement. For Thai SET50 corporates entering mandatory IFRS S2 disclosure from fiscal 2026 with EU consolidation, the ESRS E1 compliance is achievable through the IFRS S2 build largely intact. Beyond E1, CSRD requires additional ESRS topical standards (E2-E5, S1-S4, G1) that go beyond IFRS S2’s climate-specific scope. The substantive difference: IFRS S1/S2 is financial-materiality only; CSRD requires double materiality. For Thai-listed groups with both Thai SEC IFRS S2 obligations and EU subsidiary CSRD obligations, Othello scopes the parallel-track engagement under one bench discipline. See /certifications/ifrs-s1-s2/.

Post-Omnibus, three waves with distinct timelines: Wave 1 (large public-interest entities & large listed companies already reporting under NFRD) continue reporting on FY2024 in 2025 under the existing ESRS (with applicable Quick Fix reliefs); Wave 1 companies that no longer meet the new thresholds are out of scope FY2025-2026 subject to national transposition. Wave 2 (other large EU undertakings meeting the new thresholds): first report covers FY2027, due 2028, under the simplified ESRS. Wave 3 (listed SMEs): originally delayed to FY2028 reporting 2029, but Omnibus effectively exempts most SMEs entirely via the threshold change. Non-EU groups (Thai-owned, US-owned, etc. with €450M+ EU turnover): first report covers FY2028, due 2029. The simplified ESRS Delegated Act is expected September 2026.

Limited assurance is required on the sustainability disclosure, under ISAE 3000 (Revised), ISAE 3410 (for GHG-specific work), or applicable Member State equivalents. The Omnibus removed the planned transition to reasonable assurance — limited assurance is retained as the standing requirement. Assurance is typically provided by the entity’s existing financial-statements auditor (Big-4 or large mid-tier audit firm with sustainability assurance capability) or by a specialist sustainability-assurance provider operating under the same standards. Othello’s bench includes AA1000AS ACSAP and ISO 14064 Lead Auditor credentials (Panit Chancharoonpong) for separately-scoped assurance engagements on parallel-track sustainability reports — but never on the same CSRD engagement as the consultative work, to preserve independence. See /certifications/aa1000as/ and /certifications/iso-14064/.

CSRD/ESRS is the first of Nataree Aussapim’s five EU & Cross-Border Disclosure anchors — alongside CBAM, EU Taxonomy, TCFD, and SBTi. Together with the firm’s three reporting-framework anchors (GRI 2021, IFRS S1/S2, FTSE Russell) and Panit’s seven-credential ESG-assurance cluster (AA1000AS, ISO 14064, TGO, Verra, CORSIA, ICVCM, ISCC PLUS), the firm operates the full sustainability-disclosure stack a Thai-owned EU subsidiary or Thai-listed group with EU consolidation needs: regulatory CSRD compliance, ESRS-aligned disclosure, GRI-interoperable content, IFRS S2 climate-disclosure feed-through, AA1000AS-grade assurance overlay where commissioned, and value-chain coordination capped by VSME for SME suppliers. Founded 2020 on US Government bilingual contracts under FAR-grade contractor verification, the firm’s procurement-grade audit-trail standard applies to CSRD engagements the same way it applies to ATA-certified translation or AA1000AS-assured ESG reports. One engagement letter, one NDA from first email, one audit-trail Bangkok-side, twenty credentials behind it. Email [email protected] or call +66 02-859-2145.