The Bank of England has unveiled a series of adjustments to its Sterling Monetary Framework (SMF) collateral eligibility rules, detailed in a Market Notice issued on 11 June 2026. These changes are designed to support a transition towards a repo-led, demand-driven system for supplying central bank reserves, a move that could have a ripple effect across UK financial markets and the broader economy. The revisions cover eligible collateral types, the process for requesting eligibility for certain securities, and the application of haircuts – the reduction applied to the value of an asset used as collateral.
One key modification involves extending collateral eligibility to a wider array of debt issued by government-linked entities. From 19 June 2026, bonds from G10 and Australian regional and local governments, as well as development/policy banks, will qualify as Level B collateral, provided they meet high credit quality standards (broadly equivalent to AA-) and the Bank's settlement requirements. Concurrently, minimum credit rating requirements for G10 Government guaranteed agency bonds, alongside securities from Freddie Mac, Fannie Mae, and the Federal Home Loan Banks System, will be updated from broadly equivalent to AAA to broadly equivalent to AA-. This expansion could offer financial institutions more flexibility in the assets they can use to secure liquidity from the Bank of England.
For corporate bonds, the Bank is simplifying its classification system. From 31 October 2026, all eligible corporate bonds will be categorised solely as Level B collateral, removing the previous distinction between Level B and Level C. Importantly, the Bank has reiterated that bonds issued by corporates deriving revenue from thermal coal mining will remain ineligible. Furthermore, a revised methodology for calculating haircuts on corporate bonds will be implemented, expected to result in a reduction in the base level of these haircuts. However, to reflect the financial risks associated with the economy's transition to net zero, the Bank will apply haircut add-ons to bonds from issuers in relevant sectors, a measure designed to protect the Bank against potential climate-related financial exposures.
Changes are also coming for index-linked sovereign debt, including UK gilts. From 19 June 2026, the Bank will introduce separate, more granular haircut schedules for eligible sovereign bonds. This move aims to ensure that haircuts for both conventional and index-linked sovereign collateral adequately account for their differing valuation drivers and risk profiles across economic cycles, potentially providing greater stability in drawing capacity for firms accessing central bank liquidity. These adjustments highlight the Bank's ongoing efforts to refine its risk management framework in a complex and evolving financial landscape.
To streamline administrative processes, the Bank is launching a new interactive online request form at the end of June 2026. This form, hosted on the Bank's website, will simplify the process for SMF Participants seeking eligibility for Asset-Backed Securities (ABS) and Covered Bonds, replacing the current ABS-CERT request template and reducing the amount of information required. While the overall transparency requirements remain unchanged, this digital enhancement should make engagement with the Bank's collateral framework more efficient for financial institutions.
These operational adjustments by the Bank of England are not merely technical; they represent a calibration of the financial plumbing that underpins the UK economy. By modifying what assets commercial banks can use to secure liquidity, the Bank influences the cost and availability of funding, which can indirectly affect lending rates for UK businesses and households. For investors, particularly those in the fixed income markets, understanding these changes to collateral eligibility and haircut methodologies is crucial as they can impact demand for certain types of bonds and their perceived risk profiles. While the immediate impact on the FTSE 100 may not be direct, the overall stability and efficiency of the financial system, bolstered by these changes, is a foundational element supporting market confidence.