European Banks Face Growing Pressure From Sovereign Debt

The rise in bond yields in the euro area revives the debate on the “vicious circle” linking the health of banks to that of states. European institutions hold 4,300 billion euros in sovereign debt, but their capital reserves are stronger than during the crisis of the 2010s.

How Can Public Debt Weaken Banks ?

Banks use government bonds as liquid assets and as collateral to obtain financing. They can also hold them in order to collect their interest. However, this proximity becomes dangerous when investors doubt a government’s ability to control its debt.

In this case, bonds lose value and their yields rise. Banks holding these securities can suffer losses, while their own funding costs increase. If the state then has to support weakened institutions, its spending rises further.

This cycle can unfold in several steps :

• Investors sell the bonds of a state deemed riskier ;
• Price drops reduce the value of securities held by banks ;
• Markets demand higher interest rates to finance these institutions ;
• Banks limit their lending to protect their balance sheets ;
• The economy slows down and state tax revenues decline ;
• A potential bank bailout further burdens public finances.

This mechanism worsened the debt crisis in the eurozone between 2010 and 2012. Difficulties of states and banks then reinforced each other, with several support programs financed by public authorities.

France is now at the center of concerns. The rise in its borrowing costs, its budget deficit, and political tensions have weighed on bank stocks. Shares of the three largest French banks have fallen by 17% in six weeks.

Banks Hold 4,300 Billion Euros in Debt

Eurozone banks held 4,300 billion euros net of sovereign securities at the end of June. This amount has doubled since the previous debt crisis. However, it does not mean that their vulnerability has increased in the same proportions.

Capital reserves have increased more rapidly. The ratio between sovereign bonds and equity intended to cover losses fell from 2.7 in 2013 to less than 2.5 in 2026. The lower this ratio, the more banks theoretically have means to absorb a decline in the value of their assets.

Institutions have also reduced their dependence on bonds from their own country. These domestic securities represented 41% of their sovereign portfolios in mid-2026, compared to over 50% in 2013. This diversification limits the risk that a national budget crisis immediately hits the entire local banking sector.

For major French banks, exposure to national debt represents about 15% to 30% of their highest quality equity. By comparison, this ratio exceeded 100% for some Italian banks at the peak of the 2011 and 2012 crisis.

Simon Ainsworth, banking analyst at Moody’s Ratings, summarizes:

Banks start from a better position, but they are not immune.

The rise in yields can notably increase the cost of each new bond issuance used by a bank to refinance.

Accounting Protections Do Not Eliminate Risk

Banks have classified about 60% of their bonds among assets intended to be held to maturity. This proportion has tripled since the crisis. This accounting treatment allows them not to immediately record losses caused by a temporary price decline.

However, protection disappears if an institution must sell its bonds to quickly obtain liquidity. Losses previously unrealized then become effective. Investor perception can also deteriorate, even if losses do not yet appear in the accounts.

“If the situation is temporary, it should not strongly affect investor sentiment. If it lasts, it could weigh on risk perception,” warns Maria Rivas, analyst at Morningstar DBRS.

The eurozone now has common banking supervision, stress tests, and several intervention instruments from the European Central Bank. Institutions also display capital and liquidity ratios above regulatory requirements.

These protections reduce the risk of an exact repeat of the previous crisis. They do not neutralize the consequences of a sustained rise in yields. Funding costs, deposit trends, and potential forced sales of bonds will therefore be the main indicators to monitor.