Proposed Capital Reform Could Increase Bond Buying and Lower UK Borrowing Costs
The Bank of England (BoE) is considering changes to its bank leverage ratio rules that could significantly increase demand for UK government bonds (gilts) by making them less costly for banks to hold, according to industry proposals and banking estimates.
Banks argue that excluding gilts from leverage calculations could unlock substantial balance sheet capacity, potentially lowering government borrowing costs by more than £1 billion per year, while improving liquidity in the UK bond market.
Banks Push for Exemption on UK Government Bonds
Under the proposed change, banks would be allowed to exclude holdings of UK government debt from leverage ratio constraints.
Industry estimates suggest the impact could include:
- Up to £150 billion increase in gilt holdings
- Around £2.5 billion annual savings in government borrowing costs
- Lower gilt yields due to higher institutional demand
Barclays and other lenders argue that current rules discourage banks from holding sovereign debt despite its low risk profile.
BoE Balancing Growth Support and Financial Stability
The proposal comes as UK authorities attempt to balance:
- Supporting demand for government debt
- Maintaining post-crisis banking safeguards
- Managing long-term financial stability risks
- Ensuring liquidity in gilt and repo markets
The Bank of England has not committed to the exemption and is still consulting on potential changes.
Concerns Over Financial Stability Risks
While banks support the move, former regulators and some policymakers have warned that easing leverage rules could introduce new vulnerabilities.
Key concerns include:
- Reduced resilience during market stress
- Overexposure of banks to sovereign debt
- Potential weakening of post-2008 capital safeguards
- Increased systemic risk in crisis scenarios
Critics argue that relaxing leverage requirements could encourage excessive concentration in government bonds at the expense of diversified risk management.
Broader Review of Gilt Market Functioning
The leverage rule discussion is part of a wider review by the Bank of England into the functioning of UK sovereign debt markets.
Other areas under consideration include:
- Gilt repo market resilience
- Hedge fund leverage in government bond trading
- Structural liquidity risks in sovereign debt markets
- Private credit sector vulnerabilities
The BoE is expected to provide a broader update on these reforms in its upcoming Financial Stability Report.
Industry Says Rule Change Would Strengthen Demand
Banks argue that regulatory adjustments could improve the functioning of the gilt market by encouraging domestic institutions to hold more UK debt, reducing reliance on foreign investors.
They also claim this would:
- Stabilize long-term bond demand
- Reduce volatility in gilt yields
- Improve transmission of monetary policy
- Strengthen core financial market infrastructure
Looking Ahead
The Bank of England has not yet decided whether to proceed with the proposed changes, but consultation with banks, regulators, and policymakers is ongoing.
The debate highlights a broader tension in financial regulation: how to support government debt markets and economic growth while preserving safeguards designed after the 2008 financial crisis. The outcome could have significant implications for UK borrowing costs, bank balance sheets, and the structure of sovereign bond markets.
