The ESRS Value Chain Cap Is Final. Suppliers Now Know What CSRD Can Actually Require.

Since CSRD took shape, mid-market suppliers have been handed a sorting problem. Requests from large customers arrive through different questionnaires, portals and teams, asking for Scope 3 emissions, science-based targets, product carbon footprints, transition plans, water data, workforce metrics, EcoVadis scores and CDP responses. Some of that information feeds the customer's regulatory reporting. Some of it feeds procurement, supplier programs or the customer's own climate commitments. Much of it serves several purposes at once, and the request rarely says which.

Suppliers now have a firm reference point for telling these apart.

In September, the revised European Sustainability Reporting Standards (ESRS) and the EU's new voluntary sustainability reporting standard were published in the Official Journal, closing out the regulatory process that followed this year's CSRD reforms. For companies with 1,000 employees or fewer, the voluntary standard also sets the final value chain cap: a limit on the sustainability information a CSRD reporting company can require from a protected supplier for purposes of preparing its sustainability report.

That last phrase is the one to read closely. The cap governs what a customer can demand for CSRD. It says nothing about what a customer can ask for for any other reason.

The Cap Becomes Binding in 2027

The revised ESRS apply to financial years beginning on or after January 1, 2027, and the value chain cap applies on the same timeline.

The voluntary standard now does two jobs for suppliers. A company with 1,000 employees or fewer can use it as a proportionate framework for organizing and reporting its own sustainability information. It also draws the boundary around what a CSRD reporting customer may require from that supplier to prepare its sustainability statement.

The second job is what changes the conversation between customers and suppliers. Until now, a supplier facing a broad questionnaire from a European customer had little basis for judging which datapoints CSRD actually required. The final cap does not remove every ambiguity, but it gives suppliers solid ground to stand on.

What CSRD Can Actually Ask of a Smaller Supplier

If your company has more than 10 and no more than 1,000 employees, a customer reporting under CSRD can only require a defined set of sustainability information from you, and that set is narrower than many suppliers assume.

On the environmental side, it covers your Scope 1 emissions, your location-based Scope 2 emissions and your energy consumption, along with data on water use, waste and circularity. On the social side, it reaches health and safety, training, compensation and collective bargaining for your own workforce. It rounds out with a limited set of human rights, governance and general business disclosures. For most mid-market manufacturers, this information already exists somewhere in the business, even if it has never been pulled together in one place.

Just as useful is what falls outside the cap. Scope 3 emissions are not in it. Neither are science-based targets, product carbon footprints, life cycle assessments or a detailed climate transition plan. A customer cannot point to CSRD as the reason you must produce any of them.

Outside the Cap Is Not the Same as Optional

The cap protects suppliers from excessive demands created by mandatory reporting. It is not a ceiling on what customers can expect from their suppliers more broadly, and nothing about it makes Scope 3 data, footprints or EcoVadis scores less commercially important.

Most requests reaching a mid-market supplier trace back to one of three drivers. The first is the customer's own CSRD reporting, which for a protected supplier now has a clear boundary. The second is a different regulation entirely. Depending on the customer's products and markets, that might involve packaging, chemicals, deforestation or product composition, and the CSRD cap does not override any of those obligations. The third, and fastest growing, is commercial: Scope 3 programs, SBTi supplier engagement targets, product carbon footprints for comparing materials, EcoVadis as a condition of supplier qualification, CDP supply chain programs and customer-specific climate initiatives.

That third category carries real weight. Brands need supplier data for their own Scope 3 accounting, their science-based targets and their product claims, and that pressure is building regardless of what happens in Brussels. A product carbon footprint does not have to appear on a list of mandatory CSRD datapoints to influence a sourcing decision, and a supplier that can hand over a credible one is in a stronger position than one that can't.

Ask Why Before You Answer

The practical difficulty is that a questionnaire rarely labels each datapoint as CSRD, procurement, SBTi or product regulation. The same number can travel to several teams inside a large customer.

So when a protected supplier receives a request that appears to go beyond the cap, the first response does not have to be compliance or refusal. It can be a question: is this information for your CSRD reporting, for another regulatory requirement, or for your procurement or sustainability program?

The answer shapes everything that follows. The question for suppliers shifts from "Do we have to provide this?" to "Why is the customer asking, how will they use it, and what is the most efficient way for us to respond?" The final cap makes that conversation much easier to start.

A Baseline, Not a Ceiling

The voluntary standard offers one more practical benefit. A mid-market manufacturer that organizes its sustainability information around it ends up with a core dataset designed specifically for the information needs of larger companies, sized for a business outside mandatory CSRD scope.

That dataset becomes the foundation for everything else. Instead of treating each new questionnaire as a separate reporting exercise, a supplier can build outward from it. A defensible GHG inventory extends into broader Scope 3 coverage. Product carbon footprints answer product-specific requests. EcoVadis and CDP submissions draw on the same underlying evidence. Science-based targets and climate planning meet the expectations of customers further along in their own decarbonization. The result is not a dataset built only to satisfy CSRD, but a sustainability information system that can answer many different requests without rebuilding the underlying data every time.

The cap answers one question for smaller suppliers: what a customer can require for CSRD reporting. It leaves the larger picture untouched. Those same customers are still running Scope 3 programs, setting climate targets, scoring suppliers and weaving sustainability into how they buy. The suppliers who handle this well will be the ones who build their core data once, know which additional information they're prepared to provide and why, and take the time to understand what sits behind a request before they answer it.

For suppliers that have spent years treating every sustainability questionnaire as a brand new exercise, that may be the most useful consequence of the final rule.

ADB Sustainability helps mid-market manufacturers and suppliers build exactly this kind of foundation, from GHG inventories aligned to the voluntary standard through product carbon footprints, EcoVadis and CDP submissions. If your customers' requests have started to outpace your data, we can help you sort out what is required, what is strategic and where to start.