Value-chain reporting is where sustainability requirements meet data that a company does not directly control. The 2026 revised ESRS and voluntary standard are intended to reduce unnecessary requests to smaller businesses, but they do not make material value-chain impacts or Scope 3 emissions disappear.
The goal is a proportionate information system: request what is necessary, use estimates where permitted and appropriate, explain limitations, and improve data quality over time.
Understand the value-chain cap
The European Commission’s July 2026 package includes a voluntary standard for smaller companies outside CSRD scope and a value-chain cap. The Commission explains that in-scope companies cannot require protected value-chain companies to provide more information than the voluntary standard covers.
As of August 10, the delegated acts were still subject to European Parliament and Council scrutiny and were not legally effective. Companies should confirm the final text, protected population, transition, and national implementation before redesigning supplier requests.
The cap controls information demands; it is not an automatic exemption from reporting material value-chain information under the applicable ESRS.
Start with the reporting purpose
Map every supplier or customer data field to a material impact, risk, opportunity, ESRS disclosure, emissions method, due-diligence need, or management decision. Remove fields that have no clear use and combine duplicative questionnaires.
For each retained request, communicate:
- Definition and reporting period.
- Unit, boundary, and calculation method.
- Evidence expected.
- Whether an estimate is acceptable.
- Confidentiality and intended use.
- Deadline and contact for questions.
This improves response quality and makes the request easier to defend under the value-chain cap.
Use a documented Scope 3 hierarchy
Scope 3 methods should match materiality, data availability, and decision use. A practical hierarchy is:
- Supplier-specific product or activity data where reliable and relevant.
- Activity data multiplied by appropriate secondary factors.
- Average-data methods for representative activities.
- Spend-based estimates for screening or categories without better information.
Record the method by category and supplier segment. Do not mix datasets without documenting currency years, inflation, geography, allocation, units, and coverage.
Our Scope 3 method guide explains when spend, activity, and supplier-specific approaches are useful.
Evaluate supplier information before using it
A response is not automatically evidence. Check the reporting boundary, period, methodology, allocation, factor sources, exclusions, uncertainty, and whether assurance or verification covers the supplied metric.
Where supplier data is unavailable, preserve evidence of the request and use the permitted estimation approach. Explain the limitation and create a data-improvement plan focused on the suppliers and categories that matter most.
Control the value-chain population
Reconcile upstream and downstream populations to procurement, accounts payable, sales, logistics, and asset records. Define cut-off rules for new suppliers, acquisitions, discontinued products, and intercompany transactions.
Version category mappings and overrides. A change from purchased goods to capital goods, or from upstream transport to supplier-delivered pricing, can materially affect completeness and double counting.
Make estimates assurance-ready
For each significant estimate, retain inputs, model, assumptions, sensitivity, data source, preparer, reviewer, and approval. Track manual changes and replacement of estimates with actual data.
ISSA 5000 addresses estimates, forward-looking information, group and value-chain components, and evidence over sustainability information. The future EU assurance standard may add CSRD-specific requirements, but transparent estimation is a no-regret foundation.
Carbon Impact’s CSRD solution, GHG Protocol workflow, and ISSA 5000 readiness solution help teams keep supplier requests, Scope 3 calculations, evidence, and review connected.
This article reflects information available on August 10, 2026. Confirm the final revised ESRS and value-chain cap rules for the reporting period. This is general information, not legal or assurance advice.
Sources
See how Carbon Impact supports CSRD reporting — from data collection to disclosure.