Part of the ESG reporting, the finance cut series.
Under ESRS E1 AR 19, the default GHG reporting boundary follows the financial control approach as defined in the GHG Protocol Corporate Accounting and Reporting Standard (2004) - the same perimeter used in the statutory consolidated accounts. Equity share and operational control are permitted alternatives. Choosing an alternative is therefore a departure from the default, and the CFO must be able to justify that departure to the assurance provider. This is a finance decision.
What exactly does ESRS 1 require on reporting scope?
ESRS 1 paragraph 60 states: 'The sustainability statement shall be for the same reporting undertaking as for the financial statements. If the parent undertaking prepares consolidated financial statements, the sustainability statement shall be for the parent and its subsidiaries in accordance with the applicable accounting requirements.' That is the anchor. Whatever legal perimeter your auditor signs off on in the consolidated accounts is the perimeter against which your assurance provider will test the sustainability statement. That deceptively simple rule is where most boundary problems begin.
What are the boundary options for GHG emissions and what is the default?
ESRS E1 AR 19 is explicit: ESRS 1 Chapter 5 defines the reporting boundary, 'corresponding to financial control as per the GHG Protocol Corporate Accounting and Reporting Standard (2004). Alternatively, the undertaking may use the equity share or operational control approach.' Financial control is therefore the default - it follows the consolidation perimeter used in the statutory accounts, and entities you control in the accounting sense are included in full. Equity share follows economic interest, proportionally including entities in line with your ownership stake. Operational control casts a wider or occasionally different net, capturing entities over whose operations you have direct authority regardless of ownership structure. A group that earns significant revenue through a 40 per cent joint venture will see that entity treated very differently under each method. Applying equity share or operational control is a departure from the default that requires a documented rationale. The CFO's instinct - to stay with financial control and mirror the statutory accounts - is not just tidier; it is the starting position the standard itself endorses.
Why does this create a problem for joint ventures?
Joint ventures sit at the fault line between all three approaches. Under the financial control default, a jointly controlled entity that is equity-accounted in the consolidated accounts will typically sit outside the GHG reporting perimeter. Under operational control, it may be included if day-to-day operational decisions flow through the group. Under equity share, it is proportionally included regardless.
ESRS 1 AR 36 for paragraph 61 clarifies a related but distinct category: the impacts, risks and opportunities connected with the share of a joint operation's assets, liabilities, revenues and expenses recognised in the financial statements are classified as own operations. Additionally, ESRS 1 paragraph 92 allows the undertaking to exclude from the E2-E5 environmental metrics those joint operations it does not operationally control, provided the exclusion is disclosed. That relief applies to joint operations - entities where the group holds rights to assets and obligations for liabilities directly - and is separate from the treatment of equity-accounted joint ventures, where the group holds an interest in the net assets of a separate vehicle. The two structures require different boundary analysis.
If the sustainability team chooses operational control without aligning with the finance team's statutory perimeter, the group may end up presenting a wider set of entities in the sustainability statement than in the financial statements - two different definitions of the group on the face of documents that are supposed to describe the same undertaking. That is a conversation you do not want to have with your assurance provider in year one.
How do equity-accounted associates complicate the picture?
Associates - entities over which the group exercises significant influence but not control - are equity-accounted in the financial statements and are not line-consolidated. Under the financial control default, they are excluded from the GHG boundary. Under equity share, the group's proportionate slice of their emissions is included. The difference matters both for the absolute emissions figures and for the narrative coherence of the sustainability statement. A group with a material associate in a carbon-intensive sector will face pointed questions from assurance providers and investors if the boundary choice appears designed to exclude inconvenient emissions. Remaining with the financial control default avoids that challenge entirely; departing from it requires a principled, documented reason.
What about non-material subsidiaries excluded from the consolidated accounts?
ESRS 1 paragraph 61 permits the undertaking to exclude from the sustainability reporting boundary a subsidiary that is excluded from the consolidated financial statements on grounds of non-materiality, unless specific facts and circumstances apply. That alignment provision is helpful: it means a subsidiary small enough to exclude from the statutory accounts can, consistently, be excluded from the sustainability statement. The inconsistency this page warns about arises when the sustainability side does not use that exclusion consistently - for example, when an operational control approach sweeps subsidiaries back into the GHG perimeter even though they have been excluded from the financial statements as immaterial. Finance leaders who own the boundary decision from the outset can prevent that inconsistency from arising.
What if the group acquires or disposes of a subsidiary mid-year?
ESRS 1 paragraph 74 provides two specific reliefs. On acquisition, the inclusion of a newly acquired subsidiary in the materiality assessment and sustainability statement may be deferred to the following reporting period. On disposal, the scope may be adjusted from the beginning of the current period. The practical finance point is that using either relief depends on group reporting knowing precisely which entities joined and left the group, and when - and then tracking newly acquired entities as a separate population for the next year to ensure they are picked up in full. That is consolidation master data. Groups whose legal entity management is fragmented will struggle to apply these reliefs cleanly, and an assurance provider will ask for the evidence. The boundary decision and the entity data infrastructure are inseparable.
Why is this decision one-time and sticky?
Once the boundary method is disclosed and assured, changing it requires a restatement explanation and, under most assurance frameworks, a documented rationale for the change. The comparability expectation in sustainability reporting is moving rapidly toward the same standard as financial reporting - prior-year restatements when methodology changes, with narrative explanation. Choosing a departure from the financial control default in year one and correcting it in year three is not a minor edit; it is a restatement event that will attract scrutiny from investors, assurance providers, and potentially regulators. The decision deserves the same governance rigour as a significant accounting policy choice.
What is the timing for these rules?
Commission Delegated Regulation (EU) 2026/1563 enters into force on 10 November 2026 and applies to financial years beginning on or after 1 January 2027. For financial years beginning in 2026, undertakings may apply the previous standards, the new standards, or the previous standards with specified reliefs. Whichever version is applied, the undertaking must clearly state in the sustainability statement which version it has used. Groups mid-way through their first CSRD reporting cycle should confirm with their assurance provider which version governs their current period before finalising the boundary election.
How should the CFO structure the decision?
The boundary decision should be treated as an accounting policy election. That means it is documented in the same register as other significant judgements in the financial statements, signed off by the CFO and audit committee, and stress-tested against the group's current and anticipated M&A pipeline - because an acquisition that is consolidation-material but operationally managed at arm's length will test whichever method you have chosen. The sustainability team's input is necessary - they understand the operational footprint - but the final call must sit with finance, because only finance can ensure alignment with the statutory consolidation scope and manage the assurance interface.
A practical starting point is to map the current statutory consolidation waterfall against each of the three methods for the ten most complex entities in the group: joint ventures, joint operations, partially-owned subsidiaries, associates, and any entities excluded on materiality grounds. The gaps that map reveals are the decisions that need making. Any departure from the financial control default should be documented with a clear rationale before the sustainability statement is drafted, not after the assurance process begins.
The bottom line for group CFOs
The GHG reporting boundary under ESRS E1 AR 19 defaults to financial control - the consolidation perimeter the CFO already owns. Departing from that default requires justification and is sticky once disclosed. Groups that let the sustainability team elect an alternative without finance sign-off will spend the first assurance cycle defending a boundary the CFO did not consciously choose. Groups whose CFO owns the decision from the outset - and documents it as an accounting policy election - will not. The Finance Value Score Maturity Matrix includes ESG reporting as a coverage area precisely because decisions like this one sit at the intersection of consolidation, statutory reporting, and the emerging AI-embedded finance frontier - and they belong in the office of the CFO.
Common questions
Does CSRD mandate a specific GHG boundary method such as financial control?
Yes - financial control is the default. ESRS E1 AR 19 states that the reporting boundary corresponds to financial control as per the GHG Protocol Corporate Accounting and Reporting Standard (2004). Equity share and operational control are permitted alternatives. Applying an alternative is a departure from the default that must be documented and justified to the assurance provider. The sustainability statement must in all cases cover the same reporting undertaking as the financial statements, as required by ESRS 1 paragraph 60.
Why does the GHG boundary choice matter for joint ventures?
Joint ventures are treated differently under each approach. Under the financial control default they are typically excluded if equity-accounted; under operational control they may be included; under equity share they are proportionally included. ESRS 1 AR 36 separately classifies the impacts connected with a group's share of a joint operation's assets and liabilities as own operations, and ESRS 1 paragraph 92 allows exclusion of joint operations the group does not operationally control from E2-E5 environmental metrics, with disclosure. Joint operations and equity-accounted joint ventures require separate boundary analysis. A group with significant joint ventures or joint operations that chooses its GHG boundary without aligning it to the statutory consolidation treatment may end up presenting different entity populations in its sustainability statement and its financial statements - a structural inconsistency that assurance providers will challenge.
Who should own the CSRD reporting boundary decision in a group?
The CFO should own it, because it is functionally an accounting policy election. The boundary choice interacts directly with the statutory consolidation scope, affects the assurance interface, and once disclosed is sticky - changing it requires a restatement explanation comparable to a change in accounting policy. The sustainability team's operational knowledge is an input, but the sign-off must sit with finance and the audit committee.
What happens if the sustainability team and finance team choose different GHG boundary approaches independently?
The group risks presenting two different definitions of the group to its assurance provider - one in the financial statements and one in the sustainability statement. ESRS 1 paragraph 60 requires both to cover the same reporting undertaking, so a divergence creates a compliance exposure and a potentially difficult assurance conversation. It can also produce restatement obligations if the inconsistency is corrected in a later reporting period.
Is the GHG boundary decision reversible once disclosed?
In principle yes, but in practice it is sticky. Sustainability reporting is moving toward the same comparability standard as financial reporting: a change in boundary method requires a documented rationale, prior-year comparative restatement or explanation, and will attract scrutiny from investors and assurance providers. Groups should treat the initial choice with the same rigour as a significant accounting policy election.
When do the revised ESRS rules under Regulation (EU) 2026/1563 apply?
The Regulation enters into force on 10 November 2026 and applies to financial years beginning on or after 1 January 2027. For financial years beginning in 2026, undertakings may apply the previous standards, the new standards, or the previous standards with specified reliefs. Whichever version is applied, it must be clearly stated in the sustainability statement. Groups should confirm with their assurance provider which version governs their current period before finalising the boundary election.