Why is the BIS closely watching private debt?
The Bank for International Settlements (BIS) has long been a warning voice on the risks of global private debt accumulation. In its financial stability reports, the BIS notes that corporate leverage and private sector credit growth are key predictors of banking crises. In mid-2026, with interest rates still restrictive and global liquidity tightening, vulnerabilities are concentrated in highly leveraged firms and banks exposed to cyclical sectors. The BIS insists that macroprudential supervision must be strengthened, as risks are not evenly distributed: economies like Spain's, with a business sector heavily dependent on banks, are particularly sensitive to a credit crunch.
Debt whales and the risk of financial crisis
The term 'debt whales' gained traction after an El Economista article in November 2025, which highlighted central bank warnings about large borrowers whose default could trigger a domino effect. The ECB, in its SESFOD survey published in March 2026, confirmed that financing conditions for euro-denominated securities and OTC derivatives had tightened notably. This translates into higher collateral requirements and shorter maturities, reducing banks' available liquidity. Isabel Schnabel, in a Reuters interview on 26 May 2026, stressed that financial fragmentation and imbalances in bank balance sheets are areas of focus. Philip Lane, in a conversation with Nikkei the same day, emphasized that macroprudential supervision is key to preventing a local problem from becoming systemic.
Impact on Spanish banking and the debt market
Spain has a history of credit bubbles, and its banking sector remains the main financing channel for SMEs and households. Spanish private debt has grown in recent years, especially in consumer credit and loans for tourism activities. According to the ECB's SESFOD survey, the tightening of conditions in securities financing operations affects banks' ability to obtain liquidity in wholesale markets. This could raise the cost of credit for Spanish firms and slow investment. Moreover, the ECB reminded in its decisions on 22 May 2026 of the importance of maintaining countercyclical capital buffers, a measure directly affecting banks with greater exposure to private credit. In this context, the Bank of Spain has urged institutions to strengthen provisions, but the risk of a credit crunch remains latent.
The digital euro as a possible response to instability
Although the digital euro project was announced by the ECB in 2021, its development has accelerated given the need to offer a safe haven in times of financial stress. The digital euro could provide a means of payment free of bank credit risk, which in a crisis of confidence would prevent a flight of deposits into cash. However, its implementation is not without risks: if holding limits are not set, it could disintermediate commercial banks and reduce their lending capacity. For Spain, where bank deposits are the main source of financing, this effect would be particularly acute. The ECB is studying mechanisms to avoid abrupt disintermediation, such as holding caps or attractive remuneration. The final decision could have profound implications for the stability of the Spanish banking system.
Sources and methodology
This analysis is based on official sources from the European Central Bank (SESFOD survey March 2026, interviews with Isabel Schnabel and Philip Lane May 2026, and Governing Council decisions May 2026), as well as the El Economista article (November 2025) that collected central bank warnings about 'debt whales'. Verified information has been prioritized and unverified projections avoided. For more details on how we produce our analyses, please consult our methodology and data sources. We recommend referring to the glossary for technical terms such as macroprudential or disintermediation.
Disclaimer: Informational content. Not financial advice.