Bank of England Incorporates Climate Transition Risks into Collateral Framework from October 2026

The Bank of England has changed its collateral framework to account for climate-related risks, excluding bonds issued by companies active in coal mining from collateral eligibility and introducing new corporate bond haircut add-ons from 31 October 2026 for sectors exposed to risks from the transition to a green economy. The BoE said issuers can be exposed to potential financial risks connected to the adjustment of the economy toward net zero and that it will apply haircut add-ons to bonds from issuers in relevant sectors as needed to protect the bank against financial risks. The move follows a similar change by the European Central Bank, which added a climate factor to its collateral framework in 2025 to better manage financial risk from climate change, establishing a growing pattern of central banks embedding climate risk considerations into the core monetary policy infrastructure that determines which assets banks can use as guarantees when borrowing.

 

The Collateral Framework Change and Its Significance

 

A central bank's collateral framework incorporates the rules determining which assets banks can use as guarantees when borrowing from the central bank, and under what conditions, making it a fundamental instrument of monetary policy implementation that reaches every financial institution with access to central bank liquidity. By applying haircut add-ons to corporate bonds from sectors with climate transition risk exposure, the BoE is increasing the effective cost of using these assets as collateral, creating a financial incentive for banks to reduce their holdings of climate-exposed corporate bonds and for issuers to manage their transition risk more actively to avoid collateral eligibility penalties. The coal mining exclusion is consistent with the BoE's previous corporate bond purchase scheme approach and represents a hard boundary rather than a graduated financial penalty, aligning with the precautionary principle that certain high-risk assets should be excluded from central bank balance sheet exposure entirely.

David Barmes, Senior Policy Fellow at the Centre for Economic Transition Expertise at the London School of Economics, noted that the BoE had already applied climate-related measures to the mortgages that make up the majority of collateral pledged by counterparties, meaning the corporate bond changes represent an extension of an existing climate risk management approach rather than an entirely new departure. He described the corporate bond update as sending a positive signal that the BoE is adopting a precautionary approach to climate risks as it transitions to its new operating framework, situating the collateral changes within the broader evolution of BoE monetary policy implementation. The climate stress testing evidence that financial assets including those accepted as collateral can be affected by climate change provides the analytical foundation for treating climate-exposed bonds differently in the collateral framework, as defaulting financial institutions carrying climate-impaired assets could create losses for the central bank.

 

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Civil Society Response and Calls for Stronger Measures

 

Ellie McLaughlin, Senior Policy and Advocacy Manager at Positive Money, welcomed the BoE move as particularly significant in excluding eligibility for sectors exposed to climate-related transition risks, describing it as setting an important precedent for how central banks manage climate risk in their operational frameworks. She cautioned that effectiveness will depend on the design of the haircut calculations, noting that the precise methodology for quantifying climate transition risk exposure in haircut add-ons has not yet been disclosed, and called for exclusions to extend beyond thermal coal to cover all activities described as always harmful to the climate. This civil society pressure for stronger measures mirrors similar campaigns directed at the ECB following its collateral framework changes, with advocacy groups consistently arguing that haircut add-ons are insufficient where the underlying activities are incompatible with climate targets rather than merely exposed to transition risk.

The ECB's delayed implementation history, having first announced its intention to green its collateral framework in 2021 before delaying changes in July 2024, illustrates the governance and technical complexity of embedding climate risk into central bank operational frameworks in a manner that is legally robust, financially prudent and practically implementable across diverse national banking sectors. The BoE's October 2026 implementation timeline for the new haircut add-ons provides a defined milestone against which the market can assess the practical impact of the changes on collateral availability and funding costs for climate-exposed corporate bond issuers.

 

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Outlook for Central Bank Climate Collateral Policy

 

The Bank of England's collateral framework changes represent an important step in the progressive integration of climate risk into central bank monetary policy operations, complementing the disclosure requirements, stress testing frameworks and supervisory guidance that prudential regulators have already deployed to address climate risk in the banking system. Whether the BoE's approach will prove more or less effective than the ECB's climate factor methodology in actually reducing central bank climate risk exposure will depend on the calibration of the haircut add-ons and the coverage of sectors defined as having material transition risk exposure, details that the market is awaiting. The alignment between the BoE and ECB in applying climate considerations to collateral frameworks, despite their different institutional contexts and mandates, suggests an emerging international convergence in central bank climate risk management practice that may influence other major central banks.

Sustained development of the BoE's climate collateral framework toward the stronger exclusion measures that civil society advocates are calling for would establish the UK central bank as a leader in climate-aligned monetary policy operations and demonstrate that climate risk management is compatible with the financial stability and monetary policy effectiveness objectives that define central bank mandates. The convergence of growing climate risk evidence, established central bank climate stress testing capabilities and the precedents set by both the BoE and ECB creates conditions in which further development of climate-integrated collateral frameworks across major central banks is increasingly likely over the coming years.