Why this comparison keeps coming up
A sustainability team prepares its first CSRD report using SASB metrics the company already publishes for investors, assumes the overlap will cover most of what ESRS requires, and then discovers halfway through the engagement that four material topics have no SASB equivalent. The double materiality assessment surfaces impacts on people and the environment that SASB's financial-materiality lens was never designed to capture. That mismatch is the core problem practitioners face when these two frameworks sit side by side on the same engagement.
Where judgment starts is in deciding how much of the SASB data infrastructure you can actually reuse. The underlying data (energy consumption, emissions factors, headcount) often overlaps. The materiality gate and the disclosure structure do not, and neither does the assurance scope. Getting that distinction wrong means the sustainability statement ships incomplete, and the assurance provider has to flag it.
Key Points
- SASB uses single (financial) materiality. ESRS requires double materiality covering both financial and impact dimensions.
- SASB covers 77 industry-specific standards with roughly 6 disclosure topics per industry. ESRS Set 1 contains 12 cross-cutting and topical standards.
- Use SASB when reporting to global investors under the ISSB framework. Use ESRS when the entity falls within CSRD scope.
- EFRAG's December 2025 simplified ESRS drafts cut mandatory datapoints by 61%, from over 1,000 to around 320.
Side-by-side comparison
| Dimension | SASB | ESRS |
|---|---|---|
| Governing body | IFRS Foundation (ISSB inherited SASB from the Value Reporting Foundation in 2022) | European Commission, with technical advice from EFRAG |
| Materiality approach | Single (financial) materiality: what affects enterprise value and investor decisions | Double materiality: financial materiality plus impact materiality on people and the environment (ESRS 1.37–58) |
| Scope of application | Voluntary; any entity globally; referenced by IFRS S1 as the primary source for industry-specific disclosure topics | Mandatory for in-scope EU entities and non-EU entities meeting CSRD thresholds; phased from FY 2024 (Wave 1) through FY 2028 |
| Industry specificity | 77 industry-specific standards grouped into 11 sectors, each identifying 5–8 financially material topics | Cross-sector by design; sector-specific ESRS originally planned but dropped in the Omnibus simplification in favour of referencing SASB and GRI sector content |
| Number of disclosure topics | Approximately 450 unique topics across all 77 standards | 12 standards (2 cross-cutting, 10 topical), with around 320 mandatory datapoints after the December 2025 simplification |
| Assurance requirement | No built-in assurance mandate; depends on jurisdiction adopting ISSB | Limited assurance required under CSRD from the first reporting year, with a move to reasonable assurance envisaged by October 2028 |
The practical decision rule is straightforward. Use SASB (via IFRS S1) when reporting sustainability information to global capital markets under a financial-materiality lens. Use ESRS when the entity is within CSRD scope and must meet the EU's double-materiality disclosure requirements.
When the distinction matters on an engagement
The distinction hits hardest when an entity operates inside the EU and also reports to international investors. A company within CSRD scope must comply with ESRS. If that same entity's parent or investors expect ISSB-aligned disclosure, the sustainability team also needs to address SASB's industry-specific topics. The two frameworks overlap on climate (ESRS E1 and SASB's climate-related metrics share common ground through the IFRS Foundation and EFRAG interoperability guidance published in May 2024), but they diverge on scope. ESRS demands disclosures on workforce conditions, biodiversity, business conduct, and value chain labour practices regardless of whether those topics would pass a financial-materiality gate. SASB includes only topics that an investor in that specific industry would consider decision-useful.
For the assurance provider, the consequence is practical. A limited assurance engagement on the sustainability statement under CSRD covers ESRS disclosures. It does not cover SASB-aligned disclosures published in a separate investor report. If the entity publishes both, the practitioner must be clear about which set of disclosures falls within the assurance scope and which does not. ESRS 1.120 requires the entity to disclose any connection between information in the sustainability statement and information reported under other frameworks, creating a direct linkage that the assurance provider evaluates.
We've seen engagement partners disagree sharply on how to handle the overlap. One partner treats SASB coverage as sufficient evidence that the climate disclosures also satisfy ESRS E1, because the underlying data is identical. The other insists on re-performing the double materiality assessment from scratch and documenting each ESRS datapoint separately, because the materiality gates are different standards with different thresholds. Both positions have merit, but the file should tell a story that explains the choice. Silently importing SASB metrics into the ESRS template without that reasoning is the kind of thing that looks like a tick box exercise to the reviewer.
There's also a perverse incentive at play. Teams that already report under SASB have a strong motivation to declare as many ESRS topics "not material" as possible, because every topic that passes the double materiality gate creates new disclosure obligations that SASB didn't require. The risk is that the materiality assessment gets reverse-engineered from the conclusion the team wants, rather than from an honest evaluation of impacts. Regulators are aware of this, and the first wave of CSRD enforcement actions will almost certainly scrutinize the materiality assessment methodology before looking at the disclosures themselves.
Worked example: Schafer Elektrotechnik AG
Client: German electronics manufacturer, FY 2025, revenue EUR 310M, IFRS reporter, Wave 1 CSRD reporter (large public-interest entity). Schafer also publishes an annual investor-focused sustainability report aligned with IFRS S1 and SASB's Electronic Manufacturing Services & Original Design Manufacturing standard.
ESRS reporting
Step 1: run the double materiality assessment
Schafer's sustainability team assesses all ESRS topical subjects against both financial materiality and impact materiality criteria per ESRS 1.37-58. Six topics pass the double materiality gate: climate change (E1), pollution (E2), resource use and circular economy (E5), own workforce (S1), workers in the value chain (S2), and business conduct (G1). Four topics (water, biodiversity, affected communities, consumers) do not pass.
Step 2: prepare ESRS disclosures for material topics
Under E1, Schafer reports Scope 1 emissions of 6,400 tonnes CO2e from its Nuremberg and Dresden facilities and Scope 2 emissions (location-based) of 18,200 tonnes CO2e. Scope 3 emissions total 124,000 tonnes CO2e, concentrated in purchased electronics components. Under S1, the entity discloses workforce data for 2,800 employees across two German sites, including gender pay gap metrics of 8.2% and training hours per employee of 26.
SASB reporting
Step 3: identify SASB industry topics
Under the Electronic Manufacturing Services & Original Design Manufacturing standard (SASB TC-ES), the financially material topics include energy management, waste management, labour practices, and product lifecycle management. Schafer reports total energy consumed (482,000 GJ), percentage from grid electricity (71%), hazardous waste generated (340 tonnes), and employee health and safety incident rates.
Step 4: reconcile overlapping disclosures
Climate-related energy data appears in both reports. Schafer's ESRS E1 Scope 2 figure of 18,200 tonnes CO2e derives from the same electricity consumption data that feeds the SASB energy management metric. The SASB report covers only the financially material subset. The ESRS report covers all six material topics including workforce and value chain disclosures that SASB doesn't require for this industry. Schafer includes a connectivity table in its sustainability statement per ESRS 1 showing where ESRS disclosures map to SASB metrics.
Schafer's ESRS sustainability statement and SASB investor report draw from overlapping data pools but serve different materiality lenses and different user groups. If the practitioner had assumed that SASB coverage satisfied the ESRS requirements, the sustainability statement would be missing the four non-climate material topics (E2, E5, S2, G1) and the IRO-2 explanations for excluded topics.
Why it matters in practice
Teams assume that SASB industry metrics satisfy the corresponding ESRS disclosure requirements because the underlying data overlaps. The materiality gates differ. A topic that fails SASB's financial-materiality test may still pass the ESRS impact-materiality test. Treating SASB compliance as sufficient for ESRS produces an incomplete sustainability statement that the CSRD assurance provider must flag.
Entities reporting under both frameworks sometimes present different figures for the same underlying metric (Scope 2 emissions, for example) without explaining the scope difference. ESRS 1 requires disclosure of any connection between the sustainability statement and information reported under other frameworks. Omitting the reconciliation creates confusion for users and an inconsistency finding for the assurance provider.
Honestly, the frustrating part is that nobody designed these two frameworks to work together. They emerged from different institutions with different theories of who sustainability reporting is for. Practitioners are left to build the bridge themselves, engagement by engagement, with no authoritative mapping table to fall back on.
Related terms
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Frequently asked questions
What is the difference between SASB and ESRS?
SASB identifies financially material sustainability topics for 77 specific industries, designed for investor decision-making. ESRS prescribes mandatory disclosures under the EU's CSRD using double materiality, covering both financial effects and the entity's impact on people and the environment. SASB is voluntary and global; ESRS is mandatory for in-scope EU entities. IFRS S1 paragraphs 55–59 reference SASB as industry-specific guidance; ESRS 1 paragraphs 37–58 define the double materiality methodology.
Can I use SASB disclosures to satisfy ESRS requirements?
Partially. Where SASB metrics cover the same underlying data as an ESRS datapoint (energy consumption, GHG emissions), the entity can draw from a single data source. However, the materiality scope differs. ESRS requires disclosures on topics that may not be financially material under SASB, and it mandates the double materiality assessment itself as a disclosure. EFRAG's simplified ESRS (December 2025 draft) references SASB and GRI sector content as sources for entity-specific information, but compliance with SASB alone does not satisfy ESRS.
Will SASB sector standards replace ESRS sector-specific standards?
The European Commission's Omnibus simplification dropped the planned ESRS sector standards. The simplified ESRS instead directs entities to use SASB standards, GRI sector standards, IFRS S2 industry guidance, and CDP questionnaire content as non-binding sources for identifying entity-specific disclosures. SASB sector content informs but does not replace the ESRS framework. The ISSB is concurrently amending SASB standards (nine proposed July 2025, three more planned early 2026) to align language with IFRS S1 and IFRS S2.