Fed's new stress-test rules could cut capital volatility in half

The Federal Reserve finalized two rules on September 30, 2026 that overhaul how U.S. banks stress-test their capital, smoothing year-to-year swings in required capital buffers and adding layers of transparency to model changes. Together, the framework changes could cut by half the annual volatility in stress-test-related capital requirements, giving large banks more predictable targets for capital planning and dividend decisions.

The stress test is not a once-a-year exercise that banks pass or fail. It is a regulatory tool that determines the minimum amount of capital—cash, liquid assets, and retained earnings—that banks must hold to survive a hypothetical severe downturn. That buffer translates directly into constraints on dividends, stock buybacks, and lending capacity. When the stress test tightens, banks pull back capital deployment. When it loosens, banks have more room to return capital to shareholders and expand credit.

How the stress test measures capital resilience

The Federal Reserve stress test projects how banks' regulatory capital ratios would change under hypothetical adverse scenarios over a nine-quarter projection period. The Fed estimates the effect by projecting net income and other components of regulatory capital for each participating firm, then calculates five regulatory capital measures: Common Equity Tier 1 capital, Tier 1 capital, total risk-based capital, Tier 1 leverage, and supplementary leverage ratios.

The methodology combines projected net income, adjusted for taxes, with changes in equity capital from other comprehensive income, assumed capital distributions, and other factors to produce post-stress capital ratios. Banks face scenarios involving macroeconomic shocks to interest rates, unemployment, housing prices, and equity valuations, plus market shocks to bond spreads, equity prices, and currency movements.

For the 2026 stress test completed in June, the severely adverse scenario included a commercial real estate price decline of 39 percent, a 30 percent drop in housing prices, and unemployment rising to 10 percent. Under these extreme conditions, the 32 large banks subject to testing were projected to absorb nearly $708 billion in losses.

What changed in the new framework

The first rule requires the Federal Reserve Board to invite public input annually on stress test scenarios and material model changes before deploying them. Previously, the Fed would introduce model changes with less visibility, sometimes catching banks off guard when their capital requirements shifted unexpectedly year to year.

The second rule adds a second global market shock component to the annual test. Banks with large trading books already face stress against one global market shock—a sudden repricing of bonds, equities, credit spreads and currency movements applied in tandem. Now they will be tested against two different shock scenarios each year, and regulators will use whichever shock produces the larger losses to calculate each bank's results.

The most consequential change shifts stress capital buffer calculations to a two-year average, beginning in 2028. The stress capital buffer is calculated as the peak-to-trough decline in a bank's Common Equity Tier 1 ratio during the severely adverse scenario. Instead of basing a bank's required capital buffer solely on that year's stress test results, the Fed will average the results from the two most recent annual tests. That averaging formula will persist in perpetuity—when 2029 results arrive, the Fed will average 2028 and 2029, not just use 2029 alone.

Why volatility matters for bank capital planning

A bank's total Common Equity Tier 1 capital requirement consists of three components: the regulatory minimum of 4.5 percent, the stress capital buffer requirement of at least 2.5 percent, and for large systemically important banks, an additional capital surcharge. When the stress capital buffer tightens, these constraints pile up. A one-year tightening of the SCB by one percentage point would require a large bank to raise additional capital from earnings or asset sales, immediately forcing reductions in shareholder distributions.

Stress test requirements have historically bounced around. A tightening in one year's results—driven by changes to Fed models, economic assumptions, or bank portfolios—could spike a bank's required capital buffer by several percentage points, forcing swift reductions in dividends or buyback plans. The next year's loosening would swing capital requirements back down, leaving management having overreacted to a temporary volatility spike. For large banks managing shareholder expectations and dividend growth, that choppy signal creates operational chaos.

The Fed estimates the new framework will reduce year-over-year volatility in capital requirements by approximately 50 percent without materially affecting aggregate capital requirements across the system. Banks still face binding constraints—the averaging rule does not lower total required capital, it only smooths how that requirement changes year to year.

How averaging stabilizes capital deployment decisions

Capital planning becomes more tractable when the regulatory benchmark moves in smaller steps. A bank can commit to a dividend or buyback schedule knowing that the regulatory capital floor is less likely to spike upward in the next annual test. With smoother requirements, dividend growth can proceed on a more predictable track, and banks can authorize buyback programs that won't be forced to halt due to surprise tightening.

Lenders can better predict how much room they have to expand credit without having to rebuild capital buffers faster than expected. When stress test requirements shift sharply, banks often respond by tightening credit standards, reducing loan commitments, or scaling back new lending initiatives. Averaging the stress capital buffer over two years should reduce those sharp credit-supply reversals by making required capital levels more predictable.

By smoothing capital requirements, the averaging rule should reduce the volatility in bank lending growth from year to year, helping businesses plan financing needs with more stable credit availability signals from their lenders.

Timeline and the path to implementation

The rules take effect December 31, 2026, with public comment periods opening January 10, 2027. Banks will be invited to submit comments on stress test scenarios and model changes annually starting in 2027. Models incorporating public input will be deployed for the 2027 stress test cycle, meaning the first stress test to reflect public feedback will be administered in 2027 for publication in June 2027.

The two-year averaging calculation will begin for the 2028 cycle, when stress capital buffer requirements calculated in 2028 will reflect the average of results from the 2027 and 2028 annual supervisory stress tests. The averaging formula will persist going forward: in 2029, the SCB will average the 2028 and 2029 results, and so on.

For the current year, the stress test environment remains stable. The 2026 stress test showed all 32 large banks maintaining sufficient capital. The aggregate Common Equity Tier 1 ratio declined from 12.8 percent to a low of 11.2 percent under stress, well above the 4.5 percent regulatory floor, then recovered to 12.7 percent by the end of the nine-quarter projection. The 1.6 percentage point decline was smaller than recent years' declines. Regulators froze current stress capital buffer requirements until 2027, meaning no immediate tightening that would force dividend cuts or buyback suspensions.

The transparency trade-off and regulatory debate

The transparency rule has support across the banking industry. The American Bankers Association and Bank Policy Institute argue that public comment on scenarios and model changes enables "more thoughtful capital planning at covered banks, with economic benefits to the country." Advance notice of model revisions allows banks to run internal parallel stress tests and understand what capital impact to expect.

The changes face sharper criticism from consumer advocates. Better Markets, an advocacy organization, argues the updates make the stress-test process "increasingly hollow" and "disconnected from the risks facing the banking system," with the changes "burdening the Fed's ability to respond to emerging threats."

The Federal Reserve maintains that averaging preserves aggregate capital levels while smoothing the regulatory signal, estimating that the changes will reduce year-over-year volatility by about 50 percent without materially affecting aggregate capital requirements. Vice Chair Bowman emphasized that the framework remains "transparent, granular, and risk-sensitive" despite the smoother year-to-year movements.

Related coverage: Federal Agencies Must Navigate Public Comments, Cost Reviews Before Writing Business Rules; How business investment responds to Federal Reserve monetary policy signals; The Three Letters That Determine Corporate Borrowing Costs.