Overview
TCFD and ISSB are bundled together because ISSB IFRS S1 & S2 explicitly builds on and incorporates the TCFD recommendations, and the IFRS Foundation states that companies applying IFRS S1 and IFRS S2 meet the TCFD recommendations. In practice, TCFD is the legacy climate-disclosure architecture and ISSB is the current global ESG reporting baseline that extends it.
Bundling TCFD and ISSB into one standards frameworks bundle and guide helps companies transition without data loss, preserve existing climate-disclosure workflows, and maintain consistency across jurisdictions that are already on ISSB or are moving toward it.
What These Frameworks Are
TCFD was the market-led climate-disclosure framework created by the Financial Stability Board to improve transparency on climate-related governance, strategy, risk management, and metrics. The TCFD completed its remit and disbanded in October 2023, with monitoring responsibilities transferred to the IFRS Foundation which oversees the ISSB.
ISSB is the International Sustainability Standards Board’s global baseline for sustainability disclosures, with IFRS S2 covering climate-related disclosures and IFRS S1 covering general sustainability-related information.
Why TCFD And ISSB Are Grouped Together
ISSB S2 is designed to supersede and extend TCFD, not replace it with a different subject area. Companies already reporting TCFD can transition to ISSB without losing the core governance, strategy, risk, and metrics architecture, because those elements are embedded in IFRS S2.
Grouping both standards together also reduces duplication for companies operating across jurisdictions, because the same climate data can support both legacy TCFD-style reporting and newer ISSB-aligned reporting.
Who Must Comply
TCFD is still used in some jurisdictions and by companies that continue to report under legacy climate-disclosure rules. ISSB is increasingly used as a mandatory or quasi-mandatory baseline across jurisdictions that are adopting or aligning with IFRS S1 and IFRS S2.
This combined guide is especially relevant for companies in the UK, Singapore, Hong Kong, Japan, Australia, Canada, and other markets where adoption, alignment, or transition toward ISSB is underway.
Where It Is Used
ISSB adoption or alignment is now visible across dozens of jurisdictions, with IFRS Foundation profiles and snapshots covering Australia, Canada, Hong Kong SAR, Japan, Singapore, the UK, and many others. The framework is used in sustainability reporting, climate-risk governance, capital-markets disclosure, and investor-facing reporting processes.
Within a company, TCFD / ISSB applies to board oversight, climate strategy, risk management, emissions data, targets, transition plans, and disclosures that connect climate risk to financial value.
When It Applies
ISSB timing depends on the jurisdiction that adopts it, and many markets are phasing in requirements by fiscal year rather than calendar year. Because adoption continues to evolve, companies should treat the current local requirement as the legal baseline and update internal controls as jurisdictions finalize their approach.
TCFD-style reporting may remain relevant during transition periods, but where IFRS S2 applies it is the stronger and more detailed reporting standard.
Unique Requirements
ISSB S2 is more detailed than TCFD and can require expanded disclosures on industry metrics, financed emissions, carbon credits, transition plans, and climate governance details. TCFD remains the conceptual base, but ISSB adds more structure and granularity for modern investor-focused reporting.
For companies used to TCFD, this is a migration, not a reset: the data model is compatible, but the disclosure depth is higher.
TCFD Vs ISSB
TCFD is the older climate-disclosure framework; ISSB is the current standards body and reporting system that incorporates it. TCFD focuses on the four classic pillars of governance, strategy, risk management, and metrics and targets, while ISSB S2 keeps those pillars and expands the detail, consistency, and industry specificity.
If your company already reports TCFD, you already have the foundation for ISSB. The goal is to reuse the same climate data layer and enrich the disclosure set rather than rebuild from zero.
Data Retention And Archives
Your climate reporting records should be retained for multiple years to support legal, audit, and assurance needs. GAIQ preserves published reports and supporting records as accessible archives, and legacy TCFD data can be carried forward into ISSB reporting cycles without losing historical continuity.
This allows your team to preserve prior disclosures, re-use historical emissions and risk data, and keep a clean audit trail across framework transitions.
How The GAIQ™ AI-Driven Platform Makes TCFD and ISSB Reporting Simpler
The GAIQ™ platform preloads the relevant standards based on your DMA and reporting profile, so your team can start with the right climate framework already configured. It maps climate data to TCFD and ISSB disclosure requirements, tracks which points are mandatory versus voluntarily disclosed, and helps maintain consistency across jurisdictions.
GAIQ™ also reduces duplicate work by linking one climate dataset to multiple disclosure outputs and making the active framework visible in the app header and data pages.
Next Steps For Your Team
Use this combined TCFD / ISSB guide if you are transitioning climate reporting across jurisdictions. Reuse your existing TCFD data model where possible, expand it where ISSB S2 requires deeper disclosure, and keep legacy reports available as archives for continuity and audit support.
Adopt AI technology to automate data collection, mapping, and reporting workflows, which can significantly reduce the time and effort required for ESG reporting.
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Executive Summary
TCFD and ISSB are best treated as one climate disclosure family because ISSB S2 incorporates and extends TCFD. For companies in transition, this preserves existing climate work while moving to a more detailed global baseline.
The practical objective is simple: avoid duplication, preserve legacy data, and prepare one climate reporting system that works across multiple jurisdictions.