ESRS S1 Is About People. IFRS S1 Is Not.

Somewhere in a dual-reporting project plan there is a mapping table. On the left, the standards the group already applies. On the right, the ESRS its European subsidiaries will have to apply. Someone has drawn a line from IFRS S1 to ESRS S1.

That line is wrong. It is also the most expensive kind of wrong, because it makes a data gap look like a completed row.

Two standards, one label

IFRS S1 is General Requirements for Disclosure of Sustainability-related Financial Information. The ISSB issued it in June 2023, effective for annual reporting periods beginning on or after 1 January 2024. It requires an entity to disclose information about its sustainability-related risks and opportunities that is useful to users of general purpose financial reports in making decisions relating to providing resources to the entity, through governance, strategy, risk management, and metrics and targets (IFRS Foundation). It is a cross-cutting standard. It names no subject matter of its own.

ESRS S1 is Own Workforce. Its stated objective is “to specify disclosure requirements which will enable users of the sustainability statement to understand the undertaking’s material impacts on its own workforce, as well as related material risks and opportunities” (EFRAG). It covers people in an employment relationship with the undertaking, and also non-employees: self-employed people under contract to supply labour, and people provided by undertakings primarily engaged in employment activities.

The two S’s are the first letters of two different words, sustainability and social, and a mapping table cannot see the difference.

What ESRS S1 actually asks for

Seventeen disclosure requirements, in the published Set 1 text (EFRAG):

S1-1 Policies related to own workforce
S1-2 Processes for engaging with own workforce and workers’ representatives
S1-3 Processes to remediate negative impacts and channels for concerns
S1-4 Taking action on material impacts on own workforce
S1-5 Targets related to managing material impacts
S1-6 Characteristics of the undertaking’s employees
S1-7 Characteristics of non-employees in the undertaking’s own workforce
S1-8 Collective bargaining coverage and social dialogue
S1-9 Diversity metrics
S1-10 Adequate wages
S1-11 Social protection
S1-12 Persons with disabilities
S1-13 Training and skills development metrics
S1-14 Health and safety metrics
S1-15 Work-life balance metrics
S1-16 Remuneration metrics (pay gap and total remuneration)
S1-17 Incidents, complaints and severe human rights impacts

Read that list as a data request rather than as a chapter list. Headcount split by country and contract type. A gender field joined to a pay field. Wage floors benchmarked per country. Which collective agreements cover which legal entities. Injury rates, training hours, parental leave uptake, grievance case counts.

None of it is emissions data. Almost none of it sits in the systems a sustainability team owns. Our ESRS S1 implementation guide walks the requirements one by one; this article is about a narrower question, which is what a company outside Europe already has when it opens that list for the first time.

What the ISSB baseline gives you toward it

Nothing yet, and it is worth being precise about why.

Human capital is a research project. In the ISSB’s own words: “As part of its 2024-2026 work plan, the International Sustainability Standards Board (ISSB) is researching disclosure about risks and opportunities associated with human capital” (IFRS Foundation). The most recent update to the board, on 10 December 2025, concerned the necessity and feasibility of standard-setting, and no decisions were taken. The next milestone on the project page is to decide the project’s direction.

So there is no IFRS S3 on workforce. There is no exposure draft. There is a research phase that has not yet concluded whether a standard should exist. A company can apply IFRS S1 and IFRS S2 completely and correctly and still hold no workforce data at all, because S2 is climate and S1 is a set of general requirements applied to whatever the company judged financially material, which for most industrial groups in their first year was climate.

And SSBJ

Japan’s position follows the same shape, because SSBJ built on the same baseline.

The SSBJ issued three standards on 5 March 2025, all revised on 13 March 2026: the Universal Standard on application (サステナビリティ開示基準の適用), Theme-based Standard No. 1 on general disclosures (一般開示基準), and Theme-based Standard No. 2 on climate-related disclosures (気候関連開示基準). A fourth, practical standard followed on 11 June 2026, dealing with the use of emissions measured under the SHK reporting scheme (SSBJ).

Those three cover how to apply the standards, what to disclose generally, and climate. No social standard sits beside them, and none has been announced. The SSBJ roadmap sets out the phase-in by market capitalisation; nothing in that sequence adds a workforce requirement.

The practical consequence is easy to state and unpleasant to discover late. A Japanese group two years into an SSBJ programme has an emissions dataset, a governance narrative and a scenario analysis. It has no workforce dataset assembled to a disclosure standard. Its European subsidiaries owe one anyway.

Who owes it, and from when

The European Commission adopted the revised ESRS on 3 July 2026. Mandatory datapoints across the set fall by more than 60% and total datapoints by more than 70% (European Commission), and the revised standards apply to financial years beginning on or after 1 January 2027.

ESRS S1 survived that revision. It is still titled Own Workforce in EFRAG’s technical advice on the simplified standards (EFRAG), and the sustainability statement still has to cover it where the topic relates to material impacts, risks and opportunities. A shorter standard is not an absent one, and the datapoints that were cut were cut across the whole set rather than out of one topic.

Which companies are in scope, after the Omnibus changes, is a separate question with its own answer: see our guide to the CSRD Omnibus. The point for this article is that scope and subject matter are independent. Being smaller in scope does not make a topical standard optional for the companies still inside it.

Why this gap is structural, not lazy

Climate data has one natural owner. Somebody in the group already runs energy and fuel numbers, and the sustainability team can usually reach them.

Workforce data has several owners and none of them report to that team. Headcount by contract type is held by HR. Pay sits in payroll systems, often split by country, often outside whatever the group consolidates. The people who know which collective agreements bind which entity are usually at the entity that signed them, which in Europe means a works council more often than a head office. EHS keeps the injury records. Each of those systems has its own privacy posture, and joining a pay field to a gender field is a decision with legal weight in several jurisdictions.

That is why the gap does not close in the last quarter before a filing. The reconciliation problem is the same one we described for the SSBJ data foundation: a number is only disclosable if something existed before the report was written that an assurance provider can test.

Four things worth doing this quarter

Split the mapping table. Delete the IFRS S1 to ESRS S1 row. Map IFRS S1 to the ESRS cross-cutting standards where it belongs, and leave ESRS S1 with an empty source column so the gap is visible to whoever reads the plan.
Name an owner outside the sustainability team. ESRS S1 is an HR and payroll data programme with a sustainability deadline. If the owner sits in sustainability, the requests will keep arriving as favours.
Start collecting inside the year you will report. For a financial year beginning 1 January 2027, headcount, turnover, training hours and injury counts have to be captured as the year runs. A pay gap can be recomputed later; a monthly headcount series cannot be reconstructed after the fact.
Settle the entity boundary once. ESRS S1 covers the undertaking’s own workforce, including non-employees supplied under contract. Agency and contractor populations are exactly where the number is hardest to produce and easiest to get wrong, so decide which entities and which contract types are in before anyone starts counting.

Check where you stand

A dual-reporting group usually discovers this gap when someone asks for a diversity metric and four systems answer differently. The free CSRD readiness check takes about three minutes and scores the dimensions an assurance provider actually tests: socious.io/csrd-check.

When the collection problem is real, Socious Report is built for the shape of it: one dataset in, the CSRD, SSBJ and ISSB views drafted out of it, with the evidence trail attached to each figure rather than assembled afterwards.