SSBJ in Action: the three-phase sustainability disclosure roll-out

TL;DR - On 5 March 2025, the Sustainability Standards Board of Japan (SSBJ) issued three inaugural standards — Universal/Application Standard, Theme-based Standard 1 (general, mirroring IFRS S1), Theme-based Standard 2 (climate, mirroring IFRS S2). - The FSA's phased roll-out applies the standards as statutory YUHO disclosure: Phase 1 (FY ending March 2027) for issuers above JPY 3 trn market cap (~70 companies); Phase 2 (March 2028) for above JPY 1 trn; Phase 3 (March 2029) for above JPY 500 bn. The rest of Prime is on a path still being finalised. - Japan chose single materiality, structural IFRS alignment, and a 3-year glide path to mandatory assurance. The CGC Supplementary Principle 3-1 ③ TCFD obligation stays in force during the transition; the bridge from voluntary to statutory is now the operative IR challenge.

The institutional architecture, in one diagram

The Japanese sustainability disclosure stack now has four layers, each operating at a different legal level:

Two architectural decisions deserve highlight before the operational detail.

First, Japan chose structural alignment with IFRS S1 / S2 rather than building a parallel domestic standard. The SSBJ Theme-based Standards 1 and 2 incorporate every requirement of the ISSB's S1 and S2, with the addition of Japan-specific transitional reliefs. The reason matters: structural alignment means a Phase-1 SSBJ issuer can file a single sustainability disclosure that satisfies the SSBJ statutory mandate and the global investor expectation simultaneously. Japan has avoided a parallel-disclosure burden that the EU's CSRD-versus-ISSB position has imposed elsewhere.

Second, Japan chose single materiality. The SSBJ disclosure framework is built on financial materiality — what an entity's sustainability factors mean for its enterprise value and cash flows. This is the IFRS S1/S2 framing. The EU's CSRD, by contrast, mandates double materiality — financial materiality plus impact materiality (how the entity affects society and environment). GRI publicly urged Japan to adopt double materiality during the 2024 consultations; Japan's regulators rebuffed the proposal but emphasised that companies are free to additionally report impact-materiality content using GRI standards. The single-versus-double debate is expected to re-open in the 2026-27 CGC revision.

The phased rollout

The phased rollout, in operative table form:

The phasing logic mirrors the FSA's standard pattern: largest first, with each phase producing a year of practical implementation experience before the next phase joins. The pattern is also the pattern of the English-disclosure rollout (Post 5.1) — the largest Prime issuers are the first cohort, the rest of Prime is on a defined path, and Standard/Growth follow.

The assurance schedule is layered on top of the disclosure schedule. The FSA's roadmap calls for limited assurance (third-party) to become mandatory three years after the first mandatory disclosure. That means Phase-1 issuers must obtain limited assurance from FY March 2030; Phase-2 issuers from FY March 2031; Phase-3 issuers from FY March 2032. Reasonable assurance is contemplated but not yet on a defined timetable.

The roll-out also introduces a meaningful safe harbour in the statutory text: forward-looking statements about climate-related risks and scenarios are protected from civil liability when the disclosure is made in good faith and based on reasonable information at the time of preparation. This was an explicit ask of the issuer community during the FSA Working Group consultations and was incorporated in the November 2025 Interim Report.

What's in the standards

The three SSBJ standards work as a stack.

Universal Standard — "Application of the Sustainability Disclosure Standards"

The Universal Standard is the cross-cutting application document. It specifies the materiality lens (single materiality, financial), the time horizons (short, medium, long), the connectivity requirement (sustainability disclosures must be linked to the financial statements), the comparative-period disclosure expectation, and the location of the disclosure (statutory YUHO). It also incorporates the IFRS S1 "core content" architecture — Governance, Strategy, Risk Management, Metrics & Targets — as the structural template for every theme-based standard.

Theme-based Standard 1 — General Disclosures

Theme-based Standard 1 is the Japanese counterpart of IFRS S1. It applies to all material sustainability-related risks and opportunities, not just climate. For each material topic, the issuer must disclose: (a) the governance processes that oversee the topic; (b) the strategy and decisions taken in response; (c) the risk-management processes; and (d) the metrics and targets used to measure performance and progress.

Standard 1 is generic by design; it is the disclosure framework into which subsequent theme-based standards (biodiversity, human capital, social, etc.) will plug. The SSBJ has signalled that the next theme-based standards are likely to address human capital and biodiversity, with timing tied to ISSB developments.

Theme-based Standard 2 — Climate-related Disclosures

Theme-based Standard 2 is the Japanese counterpart of IFRS S2. It is the climate-specific application of Standard 1, with detailed industry-specific metrics derived from the ISSB's industry-based guidance.

The operative requirement most IR teams focus on is the Scope 1, 2, and 3 GHG emissions disclosure. All three scopes are required, with quantitative disclosure across the value chain. The standard's Scope-3 expectation mirrors the IFRS S2 expectation — 15 categories where applicable, with disclosure of the methodologies used. The transitional relief permits Phase-1 issuers to defer Scope-3 disclosure for the first year of mandatory application — a relief expected to be used by most Phase-1 issuers, given Scope-3 data-collection complexity.

Beyond emissions, Standard 2 requires disclosure of: - Climate-related governance (board oversight, management responsibilities). - Climate-related strategy, including the resilience of the business model to a 2°C scenario (and, voluntarily, a 1.5°C scenario). - Climate-related risks and opportunities, with quantitative and qualitative description. - Targets, including absolute and intensity-based emissions targets, with disclosure of how the targets relate to any net-zero commitment.

The bridge from CGC 3-1 ③ to statutory SSBJ

The CGC's Supplementary Principle 3-1 ③ has required Prime issuers since June 2021 to disclose climate-related information "based on TCFD or an equivalent framework." Five years on, the disclosure landscape is uneven: by mid-2023 only around 30% of Prime issuers were filing fully TCFD-aligned disclosures, with another ~50% partial-compliance and ~20% explanation-based non-compliance.

The bridge from this soft-law TCFD obligation to the hard-law SSBJ obligation is the operative challenge for Phase-1 issuers in 2025-26. Three differences matter most.

Location. TCFD-aligned disclosure has historically lived in the integrated report, the sustainability report, or — for some issuers — a corporate-website disclosure. SSBJ-aligned disclosure must live in the YUHO (statutory annual securities report). The legal status, the audit responsibility, the management certification, and the liability framework all change when the disclosure moves into the YUHO.

Granularity and assurance. TCFD disclosure has been narrative-led with optional metrics. SSBJ Standard 2 requires defined quantitative metrics (Scope 1/2/3 emissions in tCO₂e; transition risk metrics; physical risk metrics) at the granularity and methodology consistent with IFRS S2. Limited assurance is on a 3-year glide path, but the assurance-readiness work — establishing data-collection processes, controls, documentation, methodology disclosures — must begin in the first year of statutory application.

Connectivity. SSBJ disclosure must be linked to the financial statements in a way TCFD disclosure typically is not. Where a climate-related risk is material to a financial-statement assumption (e.g., useful life of long-lived assets, impairment indicators, provisions), the SSBJ disclosure must reference the financial-statement treatment and vice versa. This is the connectivity requirement borrowed from IFRS S1.

For Phase-1 issuers, the practical implication is that the FY March 2027 YUHO is being designed now. Data-collection systems for Scope-3 emissions, internal-controls documentation, third-party assurance scoping, and bilingual disclosure pipelines (per Post 5.1) all need to be built over 2025-26 to support the first filing.

The 68% data-collection problem

Deloitte's 2025 Japan sustainability-readiness survey found that 68% of Prime issuers cite "data collection and integration" as their top SSBJ implementation challenge. The finding is consistent across other surveys (PwC, KPMG, EY) and across regulator engagement materials.

The data-collection challenge has three dimensions:

1. Scope-3 emissions. Most Japanese issuers do not have systematic data flow from suppliers and customers for Scope-3 categories 1 (purchased goods), 11 (use of sold products), and 4 (upstream transportation). The data has to be either estimated (using industry-average emission factors) or collected via supplier questionnaires (which take 12-24 months to systematise).
2. Subsidiary roll-up. For diversified groups, getting consistent emissions data across foreign subsidiaries requires either a centralised reporting platform or harmonised methodologies across local finance and ESG teams. The integration with consolidated financial reporting systems is the typical gap.
3. Methodology disclosure. Standard 2 requires disclosure of methodologies used. Many Japanese issuers have been using inconsistent methodologies year to year (or different methodologies across business units) and now need to standardise and document those methodologies for statutory filing.

The 2025-26 vendor market for sustainability data platforms is now meaningfully larger than it was in 2024. JPXI's August 2025 announcement of machine-readable governance data, the rise of dedicated Japanese sustainability-data vendors (Persefoni Japan, NTT DATA's sustainability platform, Wingarc), and the integration of sustainability data into core ERP systems are all signs of the market response. The IR function's role is increasingly to brief the CFO and the controller's office on the disclosure-deadline timetable, not to own the data-collection process itself.

Sidebar: where the IFRS S1/S2 bridge breaks

For all the structural alignment, three places in the SSBJ-to-IFRS bridge are worth flagging for IR teams that operate cross-border.

Materiality assessment terminology. SSBJ uses "single materiality" framing in line with IFRS, but Japanese-language materiality assessment tools have historically incorporated stakeholder considerations that look more like double materiality. Issuers should harmonise terminology between the SSBJ statutory disclosure and any GRI-aligned sustainability report.

Industry-based guidance. IFRS S2 includes the SASB-derived industry-based guidance for 68 industries. SSBJ Standard 2 incorporates this guidance, but the Japanese-language interpretation work is still maturing. Cross-border issuers may want to refer to both the SSBJ Japanese guidance and the IFRS S2 industry guidance to ensure consistency.

Transitional reliefs. Japan's transitional reliefs are specifically Japanese — they do not apply outside the Japanese statutory disclosure. An issuer that uses the Scope-3 first-year relief in its YUHO must still respond to IFRS S2-aligned investor questionnaires that may not recognise the Japanese relief. The narrative the IR team uses needs to bridge both audiences.

What this means for IR

1. If you are a Phase-1 issuer, design the FY March 2027 disclosure now. Data-collection, methodology, assurance scoping and bilingual production all have 12-18 month lead times. The first filing's quality will set the engagement narrative for the next three years.
2. Build the bridge from TCFD to SSBJ explicitly. Do not silently re-label the TCFD disclosure as SSBJ-aligned. The granularity, location and connectivity differences are material. Walk investors through the change in your FY2026 governance report.
3. Decide your Scope-3 strategy early. The first-year transitional relief is available, but using it without a clear roadmap to full Scope-3 disclosure invites engagement questions. The strongest Phase-1 issuers will publish a 3-year Scope-3 buildout plan in parallel with the first filing.
4. Coordinate the SSBJ filing with the bilingual disclosure pipeline. Phase-1 issuers are also Prime issuers, who must file the YUHO in English on the FSA's emerging timetable (Post 5.1). The same SSBJ-aligned content needs to flow into both Japanese and English production cycles.
5. Use the safe harbour, but use it carefully. The forward-looking-statement safe harbour applies when disclosures are made in good faith and on reasonable information. The narrative around scenarios, transition plans and emissions targets should be drafted with the safe harbour in mind — but should not lean on it as a shield against substantive engagement.

Sources & further reading

• SSBJ official site (English): https://www.ssb-j.jp/en/
• FSA news release, "Interim Report of WG on Disclosure and Assurance of Sustainability-related Financial Information" (6 November 2025): https://www.fsa.go.jp/en/news/2025/20251106/20251106.html
• FSA Roadmap on Sustainability Disclosure and Assurance (November 2025 PDF): https://www.fsa.go.jp/en/news/2025/20251106/02.pdf
• FSA final report (April 2026): https://www.fsa.go.jp/en/news/2026/20260409.html
• IFRS Foundation Jurisdictional Snapshot — Japan: https://www.ifrs.org/content/dam/ifrs/publications/sustainability-jurisdictions/pdf-snapshots/japan-ifrs-snapshot.pdf
• ISSB IFRS S1 and S2 standards: https://www.ifrs.org/issued-standards/ifrs-sustainability-standards-navigator/
• JPX, "Sample Data Available for JPXI Customized Data on Director and Auditor Skills" (19 August 2025): https://www.jpx.co.jp/english/corporate/news/news-releases/6020/20250819-01.html

Next in this theme: 5.6 "30% by 2030" Is a Pipeline Problem

Related posts in other themes: - 2.3 The 2021 Revision: Prime, sustainability, diversity - 5.1 April 2025 Was a Switch, Not a Finish Line: the English disclosure mandate - 5.8 The Working Groups That Are Writing Japan's Next Governance Rules