September Changes to US Stress Tests and Capital Buffers

The Federal Reserve Board finalized changes to large-bank stress testing on September 30, 2026. The rules provide for annual public input on scenarios and material model changes. They also introduce averaging of two annual test results for relevant stress capital buffer calculations, beginning in 2028.

What scenarios test
A stress test asks how a bank’s balance sheet might perform under severe hypothetical conditions. It is different from an official prediction that a particular recession will occur. Its value lies in identifying sensitivity to possible losses and assessing the capital available to absorb them.

Greater model transparency can help outsiders understand calculations, but it does not remove the importance of data quality or supervisory judgment. Similarly, reducing year-to-year volatility in a calculation is not the same as eliminating the economic risks facing a bank.

Implementation analysis should separate the date a rule is adopted from the start dates of its individual provisions. It would also be wrong to assume every bank’s capital requirement will move by the same amount: effects depend on assets, revenue models and previous results. This report explains a regulatory methodology change rather than rating an individual institution’s safety or recommending bank shares. Actual disclosures and test outcomes remain necessary to understand the consequences for each institution.