CSRD vs ISSB
CSRD is EU mandatory law covering all stakeholders. ISSB is a global investor-focused voluntary standard adopted by 36+ jurisdictions. They overlap significantly on climate — but differ fundamentally on scope and materiality.
CSRD is broader (double materiality) but geographically limited to the EU. ISSB is narrower (financial materiality only) but becoming the global investor baseline. A company reporting full CSRD/ESRS satisfies most ISSB requirements. Build to CSRD, map to ISSB — not the other way around.
Origins and purpose
CSRD was designed by the EU to create comprehensive, comparable ESG data for regulators, investors, and all stakeholders. It uses double materiality — reporting on both how sustainability affects your company AND how your company affects the world.
ISSB was created by the IFRS Foundation in 2022 to establish a global baseline for investor-focused sustainability disclosure. It uses only financial materiality — what sustainability issues affect enterprise value. It explicitly does not require companies to report on their impacts on people or the environment unless those impacts affect financial performance.
The materiality gap
This is the most important practical difference. ISSB asks: how do sustainability issues affect your company's financial performance and position? CSRD asks both that question AND: how does your company affect the world?
A company with significant environmental impacts but no financial exposure to those impacts must disclose under CSRD but not under ISSB. CSRD's scope is therefore broader — it captures everything ISSB requires plus the impact side that ISSB omits.
Climate disclosure overlap
On climate specifically, CSRD (ESRS E1) and ISSB (IFRS S2) overlap substantially — approximately 70%. Both require Scope 1, 2 and 3 emissions, climate targets, transition plans, scenario analysis, and governance disclosures using the TCFD four-pillar structure.
If you report ESRS E1 in full, you satisfy most of IFRS S2. The gap is primarily around financial disclosures that ISSB requires in more detail for investor decision-making.
Geographic scope
CSRD applies to EU companies meeting size thresholds and non-EU companies with significant EU operations. It is legally enforced across all EU member states.
ISSB standards are adopted jurisdiction by jurisdiction. As of 2026, 36+ jurisdictions have adopted or are finalising ISSB implementation — including the UK, Australia, Japan, Singapore, Canada and Brazil. If you operate in these jurisdictions, ISSB may become mandatory for you regardless of CSRD.
CSRD vs ISSB — side by side
| Aspect | CSRD | ISSB |
|---|---|---|
| Legal status | Mandatory (EU law) | Voluntary (adopted by jurisdictions) |
| Materiality | Double (impact + financial) | Financial only |
| Primary audience | All stakeholders | Investors and capital markets |
| Climate overlap | ESRS E1 (comprehensive) | IFRS S2 (~70% overlap with ESRS E1) |
| Assurance | Mandatory | Not globally mandated |
| Adopted by | EU member states | 36+ jurisdictions globally |
| Penalties | Up to €10M | Varies by jurisdiction |
| SME standard | VSME (voluntary) | ISSB SME standard in development |
Frequently asked questions
Does CSRD compliance satisfy ISSB requirements?
Largely yes. CSRD/ESRS is more comprehensive than ISSB, so full CSRD compliance covers most ISSB requirements. The main gap is that ISSB focuses more specifically on financial materiality disclosures for capital market decision-making.
Which is more demanding — CSRD or ISSB?
CSRD is more demanding in scope (double materiality, broader reporting requirements). ISSB is less burdensome but may become mandatory in more jurisdictions. Most multinationals will need to satisfy both.
Do I need to report under both CSRD and ISSB?
If you are in CSRD scope and operate in ISSB-adopting jurisdictions (UK, Australia, Japan etc), potentially yes. However, a well-constructed CSRD report with ISSB mapping satisfies both with minimal duplication.
What happened to TCFD now that ISSB exists?
TCFD was formally disbanded in October 2023. Its monitoring responsibilities transferred to ISSB. The TCFD four-pillar structure (Governance, Strategy, Risk Management, Metrics & Targets) is now embedded in both IFRS S2 and ESRS E1.
Is ISSB replacing CSRD?
No. ISSB is a global baseline that jurisdictions can build on. The EU built ESRS on top of ISSB, adding double materiality and broader requirements. CSRD/ESRS is ISSB-compatible plus significantly more.