For years, the Task Force on Climate-related Financial Disclosures (TCFD) was the reference for climate reporting. That era has now closed: the TCFD’s work has been consolidated into การเปิดเผยข้อมูลด้านสภาพภูมิอากาศตาม, the climate standard issued by the International Sustainability Standards Board (ISSB). For Thai companies that already report against TCFD, the move to IFRS S2 is an evolution rather than a fresh start — but the differences matter. This guide explains the TCFD to IFRS S2 transition: what stays, what changes, and how to prepare.
A Quick TCFD Recap
The TCFD framework organised climate disclosure around four pillars — Governance, Strategy, Risk Management, and Metrics and Targets — and encouraged companies to disclose climate-related risks and opportunities and their financial effects. It was voluntary, principles-based, and widely adopted, including by many SET-listed companies. Its great achievement was to make climate a financial, board-level topic rather than a purely environmental one.
What IFRS S2 Is
IFRS S2 is a full disclosure standard that builds directly on the TCFD’s four-pillar structure and carries it forward as part of the ISSB’s global baseline. When the ISSB took over monitoring of climate disclosures from the TCFD, IFRS S2 became the standard that operationalises and extends the TCFD recommendations. In other words, TCFD did not disappear — it was absorbed and made more rigorous. Companies with mature TCFD reporting therefore have a strong head start on S2.
What Stays the Same
The architecture is familiar. IFRS S2 retains the same four pillars a TCFD reporter already knows:
- การกำกับดูแลกิจการ (G) — board and management oversight of climate-related risks and opportunities.
- Strategy — the climate risks and opportunities, their effects on the business, and resilience under scenarios.
- Risk Management — how climate risks are identified, assessed and managed.
- Metrics and Targets — the data used to measure and manage performance.
What Changes and Goes Further
IFRS S2 is more prescriptive and more demanding than TCFD in several respects:
- Scope 3 emissions. S2 requires disclosure of material Scope 3 emissions — the value-chain data many TCFD reports omitted.
- Industry-specific metrics. S2 points to industry-based disclosures, so sector-relevant metrics become expected, not optional.
- Financial connectivity. S2 pushes companies to connect climate information to the financial statements and the effects on financial position and performance.
- Standardisation. As a standard rather than a recommendation, S2 reduces the flexibility that made TCFD reports hard to compare.
For most companies, the biggest new lift is Scope 3 and a complete บัญชีก๊าซเรือนกระจก (GHG) to support the metrics-and-targets pillar.
The Timeline for Thailand
Globally, IFRS S2 applies for reporting periods beginning on or after 1 January 2024, with jurisdictions phasing in adoption. Thailand is moving in step with the ISSB baseline, and the SEC has signalled a roadmap toward mandatory ISSB-aligned climate disclosure for listed companies over the coming reporting cycles, with proportionate relief in the early years. The practical message for SET-listed companies is to treat the next reporting cycles as the runway to full S2 readiness rather than waiting for a hard deadline.
How to Move from a TCFD Report to IFRS S2
- Map your existing TCFD disclosure to the four S2 pillars — most content transfers directly.
- Close the Scope 3 gap — screen the 15 categories and build the material ones into your inventory.
- Add industry-specific metrics relevant to your sector.
- Connect climate to the financials — quantify effects on financial position and performance where you can.
- Reconcile Thai and English so the enhanced disclosure reads identically in both languages.
The Bilingual Dimension
As climate disclosure becomes standardised and more scrutinised, the cost of a thin or inconsistent English version rises. Under IFRS S2, governance statements, scenario analysis, Scope 3 boundaries and targets must all read identically across the Thai and English disclosure — and much of this is exactly what ratings agencies read. Handling the S2 transition within a single reconciled bilingual disclosure process is what ensures the work is credited in full. Othello supports this end to end through its climate and IFRS S2 disclosure service.
IFRS S1 and S2: How They Fit Together
IFRS S2 does not stand alone. It sits alongside IFRS S1, the ISSB’s general standard for sustainability-related financial disclosures. S1 sets the overarching requirements — how to identify, measure and disclose sustainability risks and opportunities that could affect a company’s prospects — while S2 applies those requirements specifically to climate. In practice, a company adopting S2 also applies the S1 framework for governance, materiality and the connectivity of sustainability information with the financial statements. For companies coming from a TCFD background, S1 is the newer concept; S2 is the familiar climate content, formalised.
Scenario Analysis Under IFRS S2
One area where IFRS S2 raises the bar is climate resilience. The standard expects companies to explain how resilient their strategy is to climate-related changes, using . This means considering how the business would fare under different climate futures — including a high-warming physical-risk scenario and a rapid-transition scenario — and disclosing the implications for strategy and financial planning. Many TCFD reports touched on scenarios lightly; S2 makes robust, decision-useful scenario analysis a clearer expectation, which for most companies means more rigorous work and, again, careful bilingual disclosure of assumptions and conclusions.
Practical First Steps for 2026
Companies that have not yet made the move can take concrete steps now: confirm the reporting period from which S2 will apply to them; run a gap analysis between their latest TCFD disclosure and the S2 requirements; prioritise the Scope 3 inventory, since it is usually the largest gap; and align the Thai and English versions of the enhanced disclosure from the outset rather than reconciling them at the end. Treating the coming reporting cycles as a staged transition — rather than waiting for a single deadline — spreads the work and reduces the risk of a rushed, inconsistent first S2 report.
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Related services from Othello International
Othello International is a Bangkok-based bilingual (EN↔TH) technical translation and ESG advisory firm. Related specialist services:
- climate & IFRS S2 disclosure — TCFD four-pillar
- บัญชีก๊าซเรือนกระจก (GHG) — Scope 1/2/3, TGO-aligned
- ESG disclosure translation — IFRS S2, GRI, FTSE-ready
- งานที่ปรึกษา ESG — ratings, climate, materiality
