Skip to main content
Governance Authority
Category: Sustainability and ESG

Green Taxonomy

Also known as: Sustainable Finance Taxonomy, Green Classification System
Simply put

A green taxonomy is a classification system that defines which economic activities and investments can be considered environmentally sustainable, and, by extension, which cannot. It is intended to provide a common reference point for identifying 'green' activities and to help address concerns about 'greenwashing', where activities are presented as more sustainable than they are. Different jurisdictions may develop their own taxonomies, so what qualifies as sustainable can vary depending on the framework applied.

Formal definition

A green taxonomy is a framework that establishes criteria for classifying economic activities and assets as environmentally sustainable. Such taxonomies typically define eligibility conditions that activities must meet to be considered aligned with specified environmental objectives; for example, the EU taxonomy for sustainable activities sets criteria for activities aligned with a net-zero trajectory by 2050 and broader environmental goals. The status, scope, and legal force of a green taxonomy depend on the jurisdiction and instrument adopting it, some are embedded in binding regulatory regimes while others function as voluntary reference standards, and the specific criteria, environmental objectives, and covered activities vary accordingly. Green taxonomies are generally used to support investment classification, disclosure, and anti-greenwashing efforts rather than to independently impose operational obligations on any single governance function.

Why it matters

Green taxonomies matter because they attempt to bring consistency and comparability to a market where the meaning of 'sustainable' has often been ambiguous. Without a common reference point, investors, issuers, and regulators can struggle to determine whether an activity described as 'green' meets a defined standard or simply carries a favourable label. By establishing criteria for what qualifies as environmentally sustainable, a taxonomy is intended to reduce greenwashing, the practice of presenting activities as more environmentally beneficial than they are, and to support more reliable capital allocation toward sustainable objectives.

For boards and governance functions, the significance of a taxonomy depends heavily on the jurisdiction and instrument adopting it. Some taxonomies are embedded within binding regulatory regimes, in which case they can shape disclosure obligations and how sustainability claims are framed; others function as voluntary reference standards. Because different jurisdictions may develop their own taxonomies with differing criteria and environmental objectives, what qualifies as sustainable under one framework may not qualify under another. This variation creates a governance challenge for entities operating across borders, which may need to reconcile multiple classification systems.

The reputational and compliance exposure associated with sustainability claims makes accurate application of a relevant taxonomy a matter of oversight interest. Where a taxonomy underpins regulatory disclosure, misalignment between stated and actual taxonomy status can raise questions about the reliability of an entity's reporting. Where a taxonomy is voluntary, its use still carries reputational implications if claims cannot be substantiated. In either case, the taxonomy serves as a benchmark against which sustainability assertions may be tested.

Who it's relevant to

Boards and their committees
Boards, and committees with sustainability or audit remits, have an oversight interest in whether the entity's sustainability claims and disclosures align with any applicable taxonomy. Their role is generally to ensure that appropriate processes exist for assessing taxonomy alignment and for testing the reliability of related reporting, rather than to perform the classification work themselves.
General counsel and compliance functions
Where a taxonomy is embedded in a binding regulatory regime, legal and compliance teams typically assess how its criteria affect disclosure obligations and greenwashing exposure. Because status and scope vary by jurisdiction and instrument, these functions are often responsible for identifying which taxonomy or taxonomies apply to the entity's activities.
Risk officers
Risk functions may consider the reputational, regulatory, and market risks associated with sustainability claims that cannot be substantiated against an applicable taxonomy. This includes assessing exposure arising from cross-border operations where multiple, potentially differing, taxonomies could apply.
Internal audit and assurance providers
Assurance functions may be asked to evaluate whether processes for determining taxonomy alignment are designed and operating effectively, and whether reported alignment is supported by evidence. Their focus is on the integrity of the classification and disclosure process rather than setting the criteria.
Investors and issuers
Investors use taxonomies as a reference point for identifying sustainable investment options and for evaluating claims made by issuers. Issuers, in turn, may classify and disclose the taxonomy alignment of their activities to support capital raising and to demonstrate the basis for sustainability assertions.

Inside Green Taxonomy

Classification criteria
A green taxonomy generally provides a structured system of criteria used to determine whether an economic activity qualifies as environmentally sustainable, typically defining thresholds, technical screening criteria, or performance-based tests. The specific criteria and their legal status vary by jurisdiction.
Environmental objectives
Taxonomies typically organize activities around a defined set of environmental objectives (such as climate change mitigation and adaptation). The precise objectives covered depend on the particular taxonomy and the regime that establishes it.
Do-no-significant-harm and safeguards conditions
Many taxonomies include conditions requiring that an activity contributing to one objective does not significantly harm others, and may reference minimum social or governance safeguards. Whether these conditions are binding depends on the applicable regime.
Disclosure and reporting linkage
In some jurisdictions a green taxonomy is connected to disclosure requirements for certain entities or financial products, obliging in-scope firms to report the extent to which activities align with the taxonomy. In other contexts a taxonomy functions as voluntary guidance rather than a binding rule.
Scope of application
A taxonomy specifies which entities, sectors, or financial products it addresses. Application varies by jurisdiction, sector, and entity type, and a taxonomy in one jurisdiction is not automatically applicable in another.

Common questions

Answers to the questions practitioners most commonly ask about Green Taxonomy.

Does a green taxonomy tell a company which activities are permitted or prohibited?
No. A green taxonomy is generally a classification system that defines criteria for determining whether an economic activity qualifies as environmentally sustainable; it is not a licensing regime and does not itself authorize, ban, or require any activity. It typically provides a common reference for describing and disclosing the sustainability characteristics of activities, leaving business and investment decisions to the relevant parties. Whether any taxonomy-linked disclosure or use is legally binding depends on the jurisdiction, the applicable regime, and the entity type, since some taxonomies are embedded in mandatory disclosure rules while others operate as voluntary reference standards.
Is qualifying under a green taxonomy the same as being a low-risk or high-performing investment?
No. A green taxonomy is generally oriented to environmental sustainability criteria, not to credit quality, financial return, or overall risk profile. An activity classified as taxonomy-aligned may still carry significant financial, operational, or other risks, and alignment does not constitute an assessment of investment merit. Treating taxonomy alignment as a proxy for risk or performance conflates a sustainability classification with financial analysis, which remain separate exercises. These entries are educational and not investment, legal, or compliance advice.
Who within an organization typically owns the assessment of taxonomy alignment?
Ownership generally sits with management, often through sustainability, finance, or reporting functions that gather activity data and apply the taxonomy criteria; accountability for the associated disclosures typically rests with senior management and, where applicable, those charged with governance. The board or a relevant committee generally exercises oversight rather than performing the assessment itself, and internal audit or external assurance providers may separately evaluate the process. The precise allocation of responsibility depends on the entity's structure, its governance arrangements, and any applicable legal requirements, so organizations should map roles against their own facts and jurisdiction.
How should an organization approach gathering the data needed for a taxonomy assessment?
Organizations typically begin by identifying the economic activities in scope and mapping them to the relevant taxonomy criteria, then determining what quantitative and qualitative data those criteria require. Because taxonomy criteria are often granular and activity-specific, data collection generally involves coordination across operational, finance, and sustainability functions, and may require new or enhanced record-keeping. The design of data controls and their operating effectiveness are distinct considerations, and where a taxonomy sits within a mandatory disclosure regime, the data requirements may be more prescriptive. The specifics depend on the applicable framework, jurisdiction, and the entity's own circumstances.
What role can assurance play in relation to taxonomy-related reporting?
Assurance functions may provide independent evaluation of whether taxonomy-related information has been prepared in accordance with the applicable criteria and whether the underlying processes and controls function as intended. Internal audit can assess the design and operating effectiveness of the relevant controls, while external assurance providers may offer a separate opinion, with the level and type of assurance varying by engagement and by any legal requirement. Whether assurance is mandatory, and to what standard, depends on the jurisdiction, the applicable regime, and the entity type. Organizations should confirm the requirements that apply to them rather than assume a uniform standard.
How does a green taxonomy interact with an organization's existing risk and compliance processes?
A green taxonomy generally introduces classification and disclosure considerations that can be integrated into existing risk identification, control, and compliance monitoring activities rather than replacing them. Compliance functions typically monitor adherence to any binding disclosure obligations linked to the taxonomy, while risk functions may consider related exposures such as reporting, reputational, or transition-related risks, keeping these disciplines distinct in accountability terms. Where a taxonomy is a voluntary standard rather than a legal requirement, its use is a matter of the organization's own judgment. The appropriate integration depends on the entity's governance model, the applicable jurisdiction, and the specific facts.

Common misconceptions

A green taxonomy is a single, globally mandatory standard that all organizations must follow.
Green taxonomies are established by individual jurisdictions or bodies and differ in scope, criteria, and legal status. Some are legally binding for specified entities while others operate as voluntary guidance; there is no universally mandatory global taxonomy, and applicability depends on jurisdiction, sector, and entity type.
Meeting a green taxonomy's criteria certifies that an entity's overall governance, risk, and compliance posture is sound.
A taxonomy generally addresses whether specific economic activities meet defined environmental criteria. It is a classification tool and does not, on its own, assess an organization's broader governance quality, risk management maturity, or compliance with other legal obligations.
Classifying an activity as taxonomy-aligned is an operational decision that sits solely with sustainability staff.
Accountability for accurate classification and any related disclosures typically involves management responsibility for the underlying processes and controls, with assurance functions and the board or relevant committee exercising oversight. Where taxonomy alignment feeds regulated disclosures, responsibility for the integrity of that reporting should be clearly allocated rather than treated as an isolated technical task.

Best practices

Confirm which taxonomy or taxonomies apply to your entity and clarify whether alignment is a binding legal requirement or voluntary guidance in each relevant jurisdiction before relying on it.
Assign clear accountability for taxonomy classification, distinguishing management's responsibility for the underlying data, criteria application, and controls from the board's or a committee's oversight role.
Where taxonomy alignment informs external disclosures, treat the supporting information as reportable data subject to appropriate control design and consideration of operating effectiveness.
Document the criteria and thresholds used for each classification decision so that judgments are traceable and can be reviewed by internal audit or external assurance.
Monitor for changes to the applicable taxonomy's criteria, scope, and legal status, and update classification processes accordingly given that requirements vary and evolve by jurisdiction.
Obtain qualified legal, audit, or compliance advice for specific classification or disclosure questions, since correct application often depends on the facts, the jurisdiction, and professional judgment.