Bank of England balance-sheet shift raises risks for bank funding and regulation

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BoE balance-sheet shift risks

Highlights

The Bank of England's balance sheet shrinkage has driven commercial bank borrowing through central bank repo facilities from nearly zero to about £200 billion.
Barclays' Moyeen Islam notes that increased reliance on six-month repos raises banks’ leverage exposure, heightening regulatory risks and affecting management of leverage ratios.
The Prudential Regulation Authority's March consultation proposes permitting banks to use central bank facilities without regulatory penalty, aiming to stabilize liquidity amid looming reserve scarcity.

Reserve transition and repo dependence

As reported by Financial Times, the Bank of England is approaching what Bailey called the "Preferred Minimum Range of Reserves", a threshold that broadly reflects aggregate bank demand for settlement balances and buffers against stress outflows.

As the Bank runs down its gilt holdings, commercial banks increasingly borrow reserves through central bank repo operations. The stock of such borrowing rises from almost zero to about £200 billion, marking a significant shift in how liquidity is supplied through the financial system.

That change points to the next phase of post-crisis balance-sheet management. Instead of abundant reserves created through asset purchases, the system is moving toward a structure where reserves remain available but are accessed more directly through central bank lending facilities.

Regulatory pressure and market implications

Barclays strategist Moyeen Islam says this trajectory carries risks because of the Bank of England’s dominant role in supplying reserves and the effects that asset-side changes have on commercial bank liabilities.

His analysis argues that six-month repo borrowing can increase banks’ leverage exposure, making the facilities less attractive for firms trying to manage regulatory ratios efficiently. In that view, repo works for day-to-day liquidity needs but is less effective when banks also have to protect leverage metrics.

The Prudential Regulation Authority is already examining the issue. In a March consultation paper, it proposes allowing banks to include use of standard central bank facilities without regulatory penalties, a step that could help steady short-term liquidity operations as reserve scarcity begins to tighten market conditions.

In our earlier article, we examined how the Bank of England’s quantitative tightening has pushed reserves closer to the “Preferred Minimum Range of Reserves,” prompting UK banks to rely more heavily on central bank repo funding as gilt holdings are reduced. We also highlighted the regulatory frictions this creates—especially around leverage ratio constraints—and why, even with potential Prudential Regulation Authority relief, tighter reserves could still translate into greater volatility in short-term funding markets.

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