The Bank of England just told coal companies their bonds are no longer welcome at the door. Starting October 31, 2026, bonds issued by corporations that derive revenue from thermal coal mining will no longer be accepted as collateral under the BoE’s Sterling Monetary Framework, the mechanism through which commercial banks access liquidity from the central bank.

What the BoE actually did

The announcement, made on June 11, 2026, does two things. First, it formally excludes thermal coal bonds from the list of eligible collateral that banks can pledge when borrowing from the BoE through the SMF. Second, and perhaps more subtly important, it introduces haircut add-ons for corporate bonds issued by companies exposed to net-zero transition risks.

This isn’t the BoE’s first move against fossil fuel assets. The central bank’s Corporate Bond Purchase Scheme already restricts coal-linked assets. The SMF change extends that logic to the broader framework governing how banks interact with the central bank on a daily basis.

The October 31 effective date gives banks roughly five months to adjust their portfolios.

Why this matters for banks and bond markets

Commercial banks that currently hold coal-linked bonds for collateral purposes now face a choice. They can either find alternative uses for those bonds, which likely means selling them, or they can swap them for BoE-eligible assets before the deadline.

The haircut add-ons for transition-risk-exposed bonds add another layer. Even companies that aren’t directly mining thermal coal but have significant exposure to net-zero transition risks will see their bonds treated less favorably.

The broader trend and its financial ripple effects

The BoE isn’t operating in isolation. Central banks globally have been moving toward integrating climate-related financial risks into their operations. The European Central Bank has been on a similar trajectory, and the Network for Greening the Financial System, which counts dozens of central banks as members, has been publishing guidance on exactly this kind of policy for years.

What makes the BoE’s move notable is its specificity. Rather than issuing vague guidelines about climate risk, the central bank drew a clear line: thermal coal revenue means your bonds don’t qualify.