Switzerland’s financial sector faces unprecedented uncertainty following a landmark court ruling on the treatment of Credit Suisse’s Additional Tier 1 (AT1) bonds. On October 14, 2025, the Swiss Federal Administrative Court (FAC) determined that the 2023 write-down of $17 billion in Credit Suisse AT1 securities (one of the most significant applications of the post-2008 regulatory regime for “contingent convertible” bank capital) was without legal basis. This event marks the first real implementation test of AT1 bonds during a significant banking stress since their introduction after the global financial crisis, exposing deep structural and legal ambiguities that have previously gone untested in Europe’s banking landscape.
A Stress Test Like No Other
Credit Suisse’s rapid downfall in March 2023 forced Swiss regulators to orchestrate a government-backed rescue by UBS. In a controversial move, the Swiss Financial Market Supervisory Authority (FINMA) wrote off Credit Suisse’s AT1 bonds entirely, before equity holders suffered equivalent losses. Markets had largely assumed such a write-off was inevitable in a systemic collapse. The FAC, however, found that Credit Suisse still had sufficient capital at the time, and thus the “viability event” required for an AT1 write-down had not been triggered. The court also found that bondholders’ property rights had been infringed and that Article 5a of the Federal Council’s emergency ordinance was unconstitutional, casting doubt on the very mechanics of Switzerland’s bank rescue toolkit.
Ripple Effects and Legal Uncertainty
Rather than providing clarity, the decision has deepened uncertainty for both banks and investors. The ruling leaves several key questions unanswered:
- The Federal Supreme Court may still overturn the lower court’s finding, leading to yet more months of ambiguity.
- UBS may not bear the full financial impact if compensation is required, with the government’s emergency laws potentially shifting liability away from the bank, as these measures were a precondition for the takeover.
- In the worst-case scenario, UBS’s core equity tier 1 (CET1) ratio could fall from 14.4% to 10.9% and leverage metrics could drop below regulatory requirements, weakening the bank’s capital position.
- Alternatively, a partial settlement could see AT1 bondholders compensated at the markedly depressed market values prevailing prior to the rescue, rather than at full face value.
In response to the court’s ruling, the Swiss Financial Market Supervisory Authority (FINMA) announced on 15 October 2025 that it will appeal the decision to the Federal Supreme Court within 30 days. FINMA reiterated that the AT1 write-down formed part of an emergency stabilization package underpinning the UBS–Credit Suisse merger, signaling that the dispute has now become both a financial and constitutional test for Switzerland’s bank resolution framework.
A Precedent for Future Crises
This case will have lasting consequences on the AT1 market, investor risk appetite, and Europe’s broader regulatory framework. Legal scholars now argue that while AT1 bonds were designed as the first line of defence in a bank collapse, their practical application is far from straightforward. The ruling reopens debate over creditor hierarchies and the adequacy of Europe’s crisis management toolkit more than a decade after its introduction.
As legal and regulatory frameworks evolve, this ruling may redefine how investors price risk in bank capital instruments and how regulators intervene when the next crisis strikes.
Sources:
Reuters – “Swiss court rules $20 billion Credit Suisse bond write-off unlawful”
Finews.com – “Landmark Decision: Court Rules Credit Suisse Bond Wipeout Was Unlawful”
Bloomberg – “Credit Suisse Bondholders Given Fresh Hope by Swiss Ruling”
WSJ – “Wipeout of $17 Billion in Credit Suisse Bonds Lacked Legal Basis, Court Says”
