There is no single global "ISSB compliance" obligation. IFRS S1 and IFRS S2 become mandatory only once a national regulator adopts them, so the obligation and the entities in scope depend on where a company is listed or incorporated. In Australia, AASB S2 applies to large entities under the Corporations Act, phased in since the fiscal year beginning January 1, 2025. In Hong Kong, the stock exchange requires climate disclosure for listed companies from the same date. In Japan, the SSBJ Standards apply to companies listed on the Tokyo Stock Exchange Prime Market, phased in by market capitalization starting with the fiscal year ending March 31, 2027. In the UK, the FCA has proposed mandatory UK SRS S2 climate disclosure for UK-listed companies from reporting periods beginning January 1, 2027, with a lighter transparency-only requirement proposed for companies with a secondary UK listing. A company incorporated outside these jurisdictions is not directly in scope unless it holds a qualifying listing there, though investors and customers increasingly expect ISSB-aligned disclosure regardless of formal mandate.

IFRS S2 uses a single, financial materiality lens: a company discloses climate risks and opportunities that could reasonably affect its cash flows, access to finance, or cost of capital. CSRD requires double materiality, covering financial materiality and impact materiality, the company's effect on people and the environment. Where CSRD's ESRS E1 climate standard maps substantially to IFRS S2 on structure and metrics, a company reporting under both needs an additional data set for the impact materiality side that ISSB-aligned reporting does not require.

Consequences depend on the adopting jurisdiction, since the ISSB itself does not enforce its standards. In Japan, SSBJ disclosures sit inside the annual securities report (yūhō), which carries the same legal weight as financial statements, so a misstatement or omission carries securities law consequences. In the UK, mandatory UK SRS reporting would be enforced through the FCA's Listing Rules once final rules are published, with consequences similar to existing listing-rule breaches. In Australia, climate disclosures form part of the annual sustainability report under the Corporations Act, carrying civil liability for directors for false or misleading statements. There is no single penalty framework across jurisdictions.

No. Governance, strategy, risk management, and metrics and targets are structured the same way across IFRS S1, IFRS S2, CSRD's ESRS, and GRI, since ISSB and CSRD both incorporated the TCFD's four-pillar structure. The data collection that differs is the impact materiality layer that CSRD requires and ISSB does not. A company with an existing CSRD or GRI data set can typically extract the financial materiality subset for ISSB-aligned reporting rather than building a new reporting program. 

IFRS S2 requires disclosure of Scope 3 greenhouse gas emissions across all 15 GHG Protocol categories, including financed emissions for financial institutions, using the GHG Protocol's methodology unless a jurisdiction has adopted a specific relief. Targeted amendments to IFRS S2, effective for reporting periods beginning on or after January 1, 2027, permit limiting Category 15 measurement to financed emissions and allow classification systems beyond the Global Industry Classification Standard. Jurisdictions can also introduce their own transition reliefs. The UK SRS proposal, for example, would allow UK-listed companies to report Scope 3 on a comply-or-explain basis with a one-year transitional relief, provided the company discloses which paragraphs it has not complied with and why.

ISSB-aligned reporting is generated through the Reporting Cockpit and Disclosure Management modules within the osapiens HUB, which hold ready-to-use templates for IFRS S1, IFRS S2, CSRD, VSME, and GRI on the same underlying data set. The supplier-level emissions and risk data that feeds those templates comes from the osapiens HUB for Supplier Intelligence, the same supplier profile used for due diligence obligations under the EU's Corporate Sustainability Due Diligence Directive (CSDDD). A company reporting in Japan, the UK, and the EU at the same time maps one data set to each jurisdiction's template instead of running separate collection exercises.