Switzerland has moved to harden its post-Credit Suisse banking rulebook with a new capital package aimed squarely at UBS, the country’s only remaining global systemically important bank. On Wednesday, the Federal Council adopted a dispatch to Parliament and related ordinance measures that would tighten the capital treatment of foreign subsidiaries, arguing that the existing framework leaves a critical weakness in the Swiss too-big-to-fail regime. The decision marks the most consequential step yet in Bern’s effort to prevent a repeat of the 2023 crisis that forced state-backed intervention and the emergency takeover of Credit Suisse by UBS.

The core reform is specific and highly consequential. Systemically important banks in Switzerland would in future have to fully back the carrying value of participations in foreign subsidiaries with common equity tier 1 capital at the Swiss parent. Today, officials say, roughly half of that exposure can effectively be financed with debt. The government’s position is that this arrangement can transmit losses from foreign units into the Swiss parent’s capital position too quickly, precisely when management would need flexibility to sell or isolate overseas entities during a recovery phase. By requiring full CET1 backing, Bern says the parent bank should be better able to preserve optionality in a crisis and reduce the odds of winding up in resolution or needing public support.

The Swiss authorities have framed the package not as a general punitive capital increase but as a targeted repair to a defect laid bare by the Credit Suisse failure. In the Federal Council’s summary, the problem was not merely that Credit Suisse lost market confidence; it was that foreign participations were not adequately capitalized at the Swiss parent, contributing to the bank’s inability to recover without assistance. Officials now argue that the point of the new rule is to ensure that a large Swiss-based banking group can dispose of foreign subsidiaries, in whole or in part, without immediately eroding the capital ratios of the domestic parent. That logic goes to the political heart of the proposal: Switzerland wants the benefits of hosting a global bank without leaving the state exposed to unmanageable rescue costs.

The headline numbers are significant but more nuanced than the most aggressive early scenarios. Based on end-2025 data, the Federal Council says full CET1 backing of foreign participations, combined with ordinance-level measures, would raise the CET1 capital requirement for the UBS parent by about $20 billion. Of that increase, roughly $2 billion stems from ordinance measures. The government also says the effective capital shortfall is materially smaller than the gross increase in required capital because UBS already exceeds current requirements and holds usable buffers. On its own pro forma calculation, UBS would need to build around $9 billion of CET1 capital to meet the proposed framework if it were applied using end-2025 balances.

That distinction matters for investors, supervisors and lawmakers alike. A $20 billion increase in required capital is a powerful political headline and a clear signal that Switzerland is willing to demand more from its national champion. But a shortfall closer to $9 billion suggests a different implementation challenge: not whether UBS can comply in principle, but how quickly it can do so without materially constraining distributions, business mix, or strategic flexibility. The government’s own messaging has reflected that balance. Finance Minister Karin Keller-Sutter said the new burden was “absolutely manageable” for UBS and emphasized that the final package had been moderated from earlier drafts to preserve the competitiveness of the Swiss financial center. Reuters reported that if implemented, the package would place UBS’s pro forma group CET1 ratio at about 15.5%, which Bern says is in line with large peers including Morgan Stanley, Goldman Sachs and HSBC.

The moderation is central to understanding what Switzerland did not do. The Federal Council stepped back from more sweeping or controversial measures raised during consultation. It declined to pursue a general increase in capital requirements across the board and rejected ideas such as forcing a separation of UBS’s U.S. business. It also did not overhaul the treatment of Additional Tier 1 instruments in this package, preferring to wait for international developments. On balance-sheet items such as software and deferred tax assets, the government softened its stance, opting against a demand for full CET1 backing and instead allowing a maximum three-year amortization period for software, in line with European Union practice. Those ordinance amendments are due to take effect on January 1, 2027.

Even with those concessions, the proposal preserves the element UBS has resisted most strongly: full CET1 capitalization of foreign subsidiaries. The bank responded almost immediately, saying it “strongly disagrees” with the package and arguing that the measures are extreme, internationally misaligned and dismissive of concerns raised during consultation. UBS said the ordinance amendments alone, once fully implemented, would eliminate about $4 billion of net CET1 capital at the consolidated group level and lower its group CET1 ratio by around 0.8 percentage points. That is separate from the broader legislative impact attached to the full foreign-subsidiary capital requirement. The bank’s position is that Switzerland already operates one of the strictest capital regimes among major banking centers and that further tightening risks weakening the country’s competitiveness and, by extension, its economy.

The dispute is therefore not simply about arithmetic. It is about which policy benchmark should govern a bank like UBS after the disappearance of Credit Suisse. Swiss officials are explicitly prioritizing resolvability and taxpayer protection over a narrower reading of international comparability. UBS, by contrast, is emphasizing competitive neutrality and the danger that capital requirements well above those of foreign rivals could raise funding costs, dilute returns, reduce flexibility for share buybacks or acquisitions, and ultimately make the bank less secure by limiting strategic options. Reuters reported that UBS has even warned overly strict rules could force contingency thinking that includes the possibility of moving its headquarters abroad, a politically sensitive prospect in a country whose banking identity and fiscal exposure are tightly bound together.

For Parliament, the legislation now sets up a debate that is likely to run well beyond a narrow technical review. Swiss lawmakers must decide whether the Federal Council’s targeted solution is sufficient, too harsh, or still too soft. Reuters reported that parliamentary debate is expected to begin from this summer, with May 4 identified as the expected start of deliberations in the next legislative phase. Some lawmakers have already pushed an alternative that would allow UBS to use a degree of AT1 funding to back foreign subsidiaries, reducing the cost of compliance relative to a pure CET1 requirement. The government has rejected that route so far, arguing that AT1 instruments do not provide enough reliable loss-absorbing capacity for the specific structural problem it is trying to solve.

The timing of implementation is also designed to balance urgency with practicality. UBS would get a seven-year transition period for the new capital regime, assuming the parliamentary process is not delayed. That phase-in gives management room to adapt through retained earnings, changes to intra-group structures, balance-sheet optimization, and other capital actions rather than through abrupt retrenchment. At the same time, the long transition underscores the distance between political decision and binding end-state. Reuters noted that a referendum, if one is organized, could push a public vote into 2028 at the earliest, creating another potential layer of delay. That means the rule direction is now clearer than the final legal endpoint.

The broader policy significance extends beyond UBS. The Swiss package is being watched as a test case for how a medium-sized national economy regulates a bank whose balance sheet and international footprint are outsized relative to domestic GDP. Bern’s answer is increasingly explicit: if a country wants to host a bank of UBS’s scale, it must insist that the Swiss parent can absorb shocks from foreign units without relying on debt structures that may look efficient in normal times but prove fragile in crisis. That approach contrasts with the more incremental regulatory recalibrations seen elsewhere and reinforces the notion that Switzerland is writing rules around its own institutional trauma rather than simply harmonizing to the loosest common denominator.

For capital markets, the practical questions now center on distribution capacity and valuation. A higher end-state CET1 target can influence the pace of buybacks, the size of excess capital generation, and management’s willingness to pursue expansion. Investors will weigh whether the seven-year runway and lower-than-feared effective shortfall leave UBS with enough flexibility to protect shareholder returns, or whether a structurally higher capital stack will depress profitability relative to peers. Reuters cited mixed analyst reaction, including a view from Citi that the package may be positive for near-term buybacks but unhelpful for end-state capital competitiveness. That split captures the current market logic: the immediate burden may be manageable, but the long-term return profile could still change.

The official Swiss position is that the package has already been calibrated to avoid overreach. The government says the increase in UBS’s capital requirement is lower than the previously floated $26 billion because foreign participations have declined and because ordinance-level measures were softened after consultation. It also stresses that the final framework is materially less severe than some parliamentary motions that would have imposed much more sweeping leverage-based demands. In that sense, Bern is presenting the reform as a middle course: strict enough to close a known vulnerability, but not so severe as to force a broader redesign of UBS’s business model. Whether lawmakers, the bank and investors ultimately accept that characterization will determine how confrontational the next phase becomes.

What is already clear is that the era of post-Credit Suisse ambiguity is ending. Switzerland has now translated the lesson of that crisis into a specific legislative choice: the foreign operations of a systemically important Swiss bank must be backed by more hard equity at home. That judgment will not settle every question around resolution, competitiveness or political risk. But it sharply narrows the room for argument about the direction of travel. For UBS, the challenge is no longer just to oppose the concept in principle. It is to shape the final law, manage capital planning through a prolonged transition, and convince investors that a bank facing tougher domestic constraints can still deliver internationally competitive returns. For Switzerland, the challenge is equally stark: proving that stronger safeguards can coexist with a viable global banking champion.