ESRS Reporting Boundaries: Financial Consolidation, Own Operations and the Value Chain

Technical status note. The Commission adopted the revised ESRS delegated act on 3 July 2026. At the source-status date of 2 August 2026, the act was still subject to the European Parliament and Council scrutiny process and did not yet have a final Official Journal citation. Exact paragraph numbering and transition wording should be rechecked against the final published act.

Use note. This guide distinguishes ESRS requirements from London Reporting Academy implementation practice. The boundary map, worked example and illustrative wording are educational tools, not a substitute for entity-specific accounting, legal or assurance judgement.

Boundary mistakes are rarely isolated. A wrong classification can change the double materiality assessment, the population used for workforce metrics, the emissions inventory, environmental site data, value-chain narratives, targets, financial-effects analysis and the reconciliation to the financial statements. It can also create contradictions: a site appears as “own operations” in the climate section but as “value chain” in the water section, or a joint venture is included at 100 per cent in one metric and at equity share in another without explanation.

The common shortcut is to copy the financial consolidation perimeter into every sustainability datapoint. ESRS 1 does use the financial reporting undertaking as the starting point, but it then introduces specific rules for own operations, value-chain information, joint operations, investments, leases, employee-benefit assets, acquisitions and disposals. Topic standards can add a further overlay. The practical task is therefore to maintain a controlled relationship-level map, not a single “in scope / out of scope” list.

Figure 1. The four ESRS boundary layers. The financial reporting undertaking is the base, not the end of the analysis.

1. The reporting undertaking

ESRS 1 paragraph 60 requires the sustainability statement to be prepared for the same reporting undertaking as the financial statements. Where a parent prepares consolidated financial statements, the sustainability statement is prepared for the parent and its subsidiaries in accordance with the applicable accounting requirements. The reporting period is also aligned with the financial statements.

This rule establishes the group to which the sustainability statement belongs. It supports connected information and prevents management from selecting a convenient sustainability perimeter that does not correspond to the reporting entity presented to financial-statement users.

It does not, by itself, prescribe the aggregation method for every metric. A GHG metric, a water metric, a workforce characteristic and a narrative about a supplier relationship may each need a different treatment after the base entity has been identified.

2. Own operations

For group reporting, ESRS 1 paragraph 61 generally treats the assets, liabilities, revenue and expenses of the parent and consolidated subsidiaries as own operations, wherever they are located. The standard then provides exceptions and special rules.

A subsidiary excluded from the consolidated financial statements because it is financially immaterial may also be excluded from the sustainability boundary, unless specific facts and circumstances expose the group to impacts arising from that subsidiary that meet the group’s materiality thresholds. This is not an automatic “small subsidiary” exemption. The group must still consider whether the subsidiary creates severe impacts, location-specific exposure or a concentrated sustainability risk.

For a joint operation, the share of assets, liabilities, revenue and expenses recognised in the financial statements is classified as own operations for the connected IROs, subject to the environmental metric relief in paragraph 92. This differs from an associate or joint venture accounted for under the equity method.

3. Upstream and downstream value chain

ESRS 1 paragraphs 62–65 require the information to extend beyond own operations where necessary to understand material IROs connected through direct or indirect business relationships. The requirement is materiality-led. It does not require information on every actor or every tier.

The relevant boundary can differ by matter. A critical mineral may make a particular upstream geography material for human-rights and biodiversity information. A distributor may be relevant for product safety. Product use may create downstream climate effects. A lender, platform, logistics provider or franchisee may be relevant for one IRO and not another.

The undertaking may use data collected directly from counterparties or estimates, depending on practicability and reliability. Estimates can use internal or external sources such as sector averages, samples, market data, spend-based calculations and other proxies. The data method should follow the information need; it should not determine whether the relationship is conceptually in the value chain.

4. Metric-specific overlays

A topical requirement may refine how a relationship is measured. The most prominent example is ESRS E1-8 on gross Scope 1, Scope 2 and Scope 3 GHG emissions, which contains its own consolidation and disaggregation requirements. ESRS 1 nevertheless gives precedence to its specific rules for leased assets and assets held by long-term employee-benefit schemes.

Other overlays include:

the ability to exclude activities from a metric where they are not a significant driver and the exclusion does not impair relevance or faithful representation;

partial-scope reporting for certain metrics where reliable direct or estimated data are available only for an objectively defined part of own operations or the value chain, except for the specified GHG metrics;

the relief allowing joint operations without operational control to be excluded from specified E2–E5 environmental metrics, with transparent scope disclosure and an improvement plan;

entity-specific value-chain metrics where topical standards do not provide a metric but one is necessary to report material value-chain information.

“Operational control” and “financial control” are measurement concepts used in particular methodologies and topical requirements. They should not replace the ESRS classification sequence.

A consolidated subsidiary is normally within own operations even where a particular environmental installation is operated by a third party. Conversely, a non-consolidated investee may be in the value chain but still be included in a particular GHG consolidation approach. A leased factory may be an own-operations use case for the lessee even if legal title remains with the lessor. The boundary memo should therefore record both the accounting relationship and the relevant control concept instead of choosing one label for all purposes.

A useful boundary map is maintained at the level at which classifications can genuinely differ: legal entity, operation, asset, relationship or material portfolio. The accompanying Excel workbook contains an editable BOUNDARY MAP sheet. A minimum record should include the following fields.

Figure 2. Boundary classification flow. Special relationships must be classified before material value-chain extension and topical metric testing.

Step 1. Reconcile the legal-entity universe to finance

Obtain the current consolidation schedule, ownership chart, acquisition and disposal list, joint-arrangement register, lease population and investment portfolio. Reconcile names and identifiers to the general ledger and consolidation system. The output is the complete starting population, including financially immaterial entities and dormant or recently acquired entities.

Step 2. Identify accounting treatment and recognised interests

For every non-wholly-owned relationship, record whether it is fully consolidated, proportionately recognised as a joint operation, equity-accounted, measured as an investment or held through a benefit scheme. Record the share of assets, liabilities, revenue and expenses recognised where relevant.

Step 3. Assign the base own-operations classification

Apply paragraphs 60–61 and AR 36. Document any financially immaterial subsidiary proposed for exclusion and test whether sustainability facts and circumstances override that exclusion. Avoid relying solely on revenue or asset size; a small hazardous facility, a high-risk geography or a severe workforce impact can be material at group level.

Step 4. Identify dual and special relationships

Flag associates or joint ventures that are also suppliers, customers, licensors, distributors or service providers. Flag leases, managed investments, outsourced operations and assets held through employee-benefit schemes. These records require more than one analytical lens.

Step 5. Map material IROs to the relevant part of the value chain

Use the double materiality assessment and IRO register to identify where each material matter arises. The value-chain boundary should be matter-specific: the relevant actors, locations and lifecycle stages for water may differ from those for worker safety, product privacy or climate transition risk.

Step 6. Apply policy, action and target boundaries

Paragraph 68 limits value-chain information about policies, actions and targets to the value chain actually within their scope. Do not imply global supplier coverage where the policy applies only to strategic suppliers, or a downstream target where the action plan covers manufacturing only.

Step 7. Apply the metric-specific rule and data method

For each material metric, document the source requirement, included population, consolidation basis, estimate method and any relief. Keep a separate metric-boundary field; otherwise the base relationship classification will be mistaken for the calculation method.

Step 8. Approve, disclose and reassess

Have group finance confirm the reporting undertaking, topic owners confirm material IRO coverage and methodology owners confirm metric overlays. Reassess after acquisitions, disposals, changes in contracts, new materiality conclusions, methodology changes or data improvements.

Context. Meridian Engineering plc prepares consolidated financial statements for a parent and 18 subsidiaries. It also has a 50% joint operation, a 30% equity-accounted battery joint venture, a leased coating plant, a pension-plan investment portfolio and a critical supplier that is also a 12% investee.

Issue. The first boundary spreadsheet classifies every consolidated entity as “100% in scope” and every non-consolidated relationship as “out of scope”. This produces four problems: the recognised joint-operation share is missing from own operations; the battery JV’s supplier relationship is ignored; use-related impacts at the leased plant are treated as the lessor’s responsibility; and the pension portfolio is absent from value-chain screening.

Decision process. Meridian reconciles the entity universe to finance, records the accounting treatment and then applies the boundary map. The recognised share of the joint operation is classified as own operations. The battery JV remains a value-chain investment, but its supply relationship is separately assessed using the same approach as comparable suppliers; procurement-related metrics are not restricted to the 30% equity interest. The leased coating plant’s use-related energy, water and pollution impacts are treated as Meridian’s own operations during the lease. Pension assets are screened as value-chain business relationships.

Metric overlay. For E2–E5 metrics, Meridian evaluates whether the joint-operation relief for lack of operational control applies. For GHG emissions, it applies E1-8 and the relevant methodology, while respecting the ESRS 1 lease rule. For supplier worker impacts, it uses a combination of direct audit data and regional estimates.

Limitation. Direct data are unavailable for two indirect supplier tiers. The group does not remove those tiers from the conceptual boundary; it documents estimates, uncertainty and a plan to improve coverage.

Annotation 1 — reporting undertaking. The wording connects the statement to the consolidated financial statements rather than inventing a sustainability-only group perimeter.

Annotation 2 — relationship distinctions. It separates consolidated operations, joint-operation shares, equity-accounted investments, dual supplier/customer roles and leases.

Annotation 3 — value-chain materiality. It does not claim full actor coverage; it explains that extension follows material IROs.

Annotation 4 — metric overlays. It directs readers to topic-level methodologies instead of implying that one boundary method applies to every metric.

Annotation 5 — limitations. The data gap is presented as an estimation and improvement issue, not as an undeclared exclusion.

Evidence required. Consolidation schedule, joint-arrangement and lease memos, IRO register, metric methodologies, data-gap register, approvals and reconciliation controls.

A lease can be treated differently for different ESRS disclosure purposes. Start with the financial-reporting undertaking, classify own operations and material value-chain connections, then apply the topic- or metric-specific boundary rule and document the accounting relationship and relevant control concept.

Must every subsidiary be included in every sustainability metric?

No. The parent and consolidated subsidiaries form the reporting undertaking and are normally own operations, but a metric may have a specific boundary, a permitted activity exclusion or an objectively defined partial scope. Any limitation must be supported and disclosed as required.

Are associates and joint ventures always value chain?

Investments, including associates and joint ventures, are treated as business relationships. A joint operation’s recognised share is classified as own operations. An associate or joint venture can also have a separate supplier or customer role that must be assessed on its own terms.

Can operational control replace the financial reporting boundary?

Not as a universal rule. Operational control may be relevant to particular environmental metrics and methodologies, but the ESRS analysis still starts with the reporting undertaking and ESRS 1 classification rules.

Does the value chain include indirect relationships?

Yes, where material IROs are connected through direct or indirect business relationships. ESRS does not require data on every indirect actor; it requires material information needed for understanding.

Where should boundary changes be disclosed?

The basis-of-preparation disclosure should explain the overall reporting boundary and material exceptions. Topic sections should explain metric-specific boundaries, estimates, exclusions and changes where needed for understanding and comparability.