Principles for Taxonomy Interoperability

The 'Principles for Taxonomy Interoperability' report, published by the Climate Bonds Initiative in November 2025, provides a framework for sustainable finance taxonomy developers and policymakers to ensure that national and regional taxonomies are comparable and interoperable. Launched under the Taxonomy Roadmap Initiative at COP29, the document outlines seven high-level principles designed to reduce barriers to cross-border capital flows by establishing common design features, terminology, and implementation strategies while respecting jurisdictional priorities.

• The report defines 'interoperability' as the ability for taxonomies to be compared and understood across borders by sharing a common language, principles, structure, methodologies, and objectives, even if they are not identical.
• The document proposes seven principles for taxonomy interoperability: building foundations on jurisdictional priorities and G20 best practices; applying common design features and terminology; defining specific use cases (including SME pathways); ensuring regular review of coverage; reducing complexity through science-based criteria; fostering market ownership through engagement; and joining international collaborative efforts.
• To enhance interoperability, the report recommends using a sector classification structure based on the International Standard Industrial Classification of All Economic Activities (ISIC) and adopting six common environmental objectives: climate change mitigation, climate change adaptation, biodiversity protection, sustainable use of water and marine resources, pollution control, and circular economy.
• The report emphasizes the use of 'pass/fail' screening criteria—such as quantitative technical thresholds or proxy labels like LEED Gold—over subjective, principles-based language (e.g., 'minimize' or 'reduce') to ensure cross-border comparability.
• The document identifies three primary transition approaches used by taxonomies to encourage sectors to move toward net zero: a binary approach (e.g., EU), a traffic light approach (e.g., ASEAN), and a merged approach (e.g., Australia).
• The report suggests a maturity matrix for taxonomy use cases, ranging from short-term/low complexity (e.g., green bond regulations, corporate climate disclosure) to long-term/high complexity (e.g., green quantitative easing, collateral policies).
• The Taxonomy Roadmap Initiative, launched at COP29, aims to advance interoperability through three core pillars: identifying a common core set of economic activities, developing common technical approaches, and formulating common approaches to finance the transition.

APA

Climate Bonds Initiative (2025). Principles for Taxonomy Interoperability. https://www.climatebonds.net/files/documents/publications/Principles-for-Taxonomy-Interoperability-English.pdf

Chicago

Climate Bonds Initiative. Principles for Taxonomy Interoperability. 2025. https://www.climatebonds.net/files/documents/publications/Principles-for-Taxonomy-Interoperability-English.pdf.

Wikipedia

{{cite report |author=Climate Bonds Initiative |title=Principles for Taxonomy Interoperability |date=November 2025 |url=https://www.climatebonds.net/files/documents/publications/Principles-for-Taxonomy-Interoperability-English.pdf |access-date=17 August 2026 |via=Climate Insights Directory}}

BibTeX

@techreport{climatebondsinitiative2025principles, author = {{Climate Bonds Initiative}}, title = {{Principles for Taxonomy Interoperability}}, institution = {Climate Bonds Initiative}, year = {2025}, month = nov, url = {https://www.climatebonds.net/files/documents/publications/Principles-for-Taxonomy-Interoperability-English.pdf}, urldate = {2026-08-17}, note = {Indexed by Climate Insights Directory} }