UBS wins partial relief as Swiss lawmakers back AT1 compromise on capital rules

Swiss lawmakers handed UBS a meaningful victory this week, advancing a compromise proposal that would let the country’s largest bank satisfy up to half of its new foreign-subsidiary capital requirements using Additional Tier 1 bonds rather than the more expensive common equity the government originally demanded.

The Economic Affairs and Taxation Committee is pushing the compromise forward, with an upper house vote on the broader capital package scheduled for August 31, 2026. Final legislation may not clear parliament until late 2026 or into 2027.

What the numbers actually mean

The Swiss government’s original post-Credit Suisse proposal required UBS to back its foreign subsidiaries entirely with CET1 capital. That represented a significant tightening from the prior rule, which required roughly 60% backing. The full CET1 requirement was estimated to cost UBS around $20 billion in additional high-quality capital.

The compromise halves that burden at a stroke. Because AT1 bonds carry a yield of around 7%, compared to UBS’s estimated 10% cost of equity, the swap is not just symbolic. Analysts estimate that with AT1 inclusion, the new CET1 requirement drops to approximately $400 million, a figure that is almost negligible relative to UBS’s existing capital position. The bank already holds around $20 billion in AT1 capital and maintained its CET1 ratio well above regulatory minimums as of mid-2026.

Why Credit Suisse is still casting a long shadow

None of this debate would exist without the emergency acquisition of Credit Suisse in March 2023. Swiss authorities engineered an overnight rescue that fused the country’s two largest global banks into one institution. The “too-big-to-fail” reforms that followed were designed to ensure that a UBS failure would never require Swiss taxpayers to foot the bill, with full CET1 backing for foreign subsidiaries as the centerpiece.

UBS pushed back, arguing that the full CET1 requirement would force it to hold capital idle in subsidiary structures, drag on shareholder returns, and put it at a disadvantage against American and European peers. Those concerns found a receptive audience among cross-party lawmakers who worried about Switzerland’s standing as a global financial center.

There is one historical wrinkle worth noting. During the Credit Suisse collapse in 2023, Swiss regulator FINMA controversially wrote down approximately 16 billion Swiss francs worth of Credit Suisse AT1 bonds to zero while equity holders received some value, inverting the traditional capital stack hierarchy. The current reform discussions include proposals to ensure AT1 instruments can absorb losses more predictably during future crises.

What investors and competitors are watching

Markets responded positively to earlier versions of the compromise, with UBS shares rising sharply on reports of cross-party support. The August 31 upper house vote is the next hard catalyst to watch.

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