Why Banks Are Already Bracing for Climate Stress Testing Ahead of the Fed's 2027 Framework

The Federal Reserve's 2026 annual stress test delivered a familiar, reassuring headline: the nation's largest banks remain well capitalized, able to absorb an estimated $708 billion in losses even under a severe hypothetical recession, and still keep lending to households and businesses (CNBC). What the 2026 test did not include, despite some confusion in coverage at the time, was a formal climate risk scenario. The Fed's stress capital buffer requirements stayed unchanged for 2026 while the central bank works through a broader revision of its stress-testing framework, with final rules expected to take effect for the 2027 cycle instead.

That distinction matters, because the real climate stress-testing story isn't about 2026 at all — it's about a separate exercise the Fed already ran, what it found, and why banks are quietly preparing for a framework that hasn't fully arrived yet.

The Real Climate Exercise Happened in 2023, With Six Banks

Back in September 2022, the Federal Reserve announced it would run a pilot climate scenario analysis exercise with six of the country's largest banks: Bank of America, Citigroup, Goldman Sachs, JPMorgan Chase, Morgan Stanley, and Wells Fargo. The exercise itself took place in 2023, and the Fed released its findings in May 2024 — not as part of the standard annual DFAST stress test, but as a standalone learning exercise explicitly designed to build supervisory and industry capability rather than to set new capital requirements.

The scenario design was genuinely detailed. Physical risk was assessed across six scenarios — three modeling severe hurricanes striking the northeastern United States in 2050, and three modeling shocks to real estate portfolios. Transition risk was assessed using two scenarios drawn from the Network for Greening the Financial System (NGFS), an international group of central banks and supervisors that develops standardized climate scenarios for exactly this kind of analysis.

What the Pilot Actually Found

The results, released in the Fed's May 2024 report, were less about specific capital numbers and more about exposing how unprepared the industry's internal risk infrastructure still was for this kind of analysis. Participating banks took a wide range of different approaches to estimating the financial impact of the same scenarios — there was no consistent methodology across the six institutions, which made it difficult for supervisors to compare results in any apples-to-apples way (Sullivan & Cromwell).

The exercise also surfaced significant data gaps and modeling challenges — banks often lacked the granular geospatial and property-level data needed to estimate physical risk accurately, and translating a multi-decade transition scenario into a coherent balance-sheet impact proved conceptually difficult even for banks with sophisticated risk teams. Rather than treating this as a failure, the Fed characterized the pilot as successful at its actual goal: learning where the gaps are, both at individual banks and in supervisory capacity, before any of this gets built into binding capital requirements.

Why 2026 Passed Without a Climate Component

Understanding why the climate scenario didn't make it into the 2026 DFAST cycle requires looking at what else the Fed has had on its plate. On October 24, 2025, the Federal Reserve Board issued two separate proposals to revise its broader supervisory stress-testing framework — changes that go well beyond climate risk and touch on how the annual test itself is structured and disclosed. Finalizing those proposals through a full notice-and-comment process takes time, and the Fed opted to keep stress capital buffer requirements unchanged for 2026 while that process plays out, with the expectation that a revised framework — one that could incorporate climate-related elements more formally — would be ready for the 2027 cycle.

That sequencing makes sense from a regulatory-process standpoint: rolling a genuinely new, still-being-refined risk category into the same test used to set binding capital requirements, before methodology has stabilized even across six sophisticated banks in a pilot setting, would have been a significant leap. The Fed's own 2023-2024 pilot findings — highlighting inconsistent methodology and real data gaps — arguably justified exactly the kind of pause that played out in 2026.

The specifics of the October 2025 proposals are themselves worth understanding, since they shape the environment any future climate element would eventually sit inside. One proposal follows an earlier April 2025 request for comment aimed at reducing the volatility of year-over-year capital requirement swings that stress testing can produce, specifically by averaging the stress capital buffer requirement over two consecutive years rather than resetting it fresh each cycle. The second proposal would formalize a considerably more transparent, predictable disclosure calendar: the Fed would publish proposed scenarios by October 15 of the year before each test (with at least a 30-day public comment window), publish final scenarios by February 15, and release detailed model documentation by May 15 of the test year itself, while committing to seek public comment on material model changes before they're incorporated (Sullivan & Cromwell).

That disclosure framework matters for how any eventual climate component gets introduced. A published-scenario, public-comment process is a meaningfully more transparent way to roll out something as methodologically contested as climate scenario design than the more opaque approach stress testing has sometimes used historically — and it gives banks, rather than just supervisors, a formal channel to flag exactly the kind of data-gap and modeling-inconsistency concerns the 2023 pilot already surfaced, before those concerns get locked into a binding capital requirement.

Why Banks Are Preparing Anyway

None of that means banks have simply set climate risk aside until a formal requirement arrives. The pilot exercise itself functioned as a forcing mechanism for the six participating banks, who had to build out scenario-analysis capability that didn't meaningfully exist beforehand — geospatial risk mapping, transition-scenario modeling, and the internal data infrastructure to support both. Banks that went through that process aren't going to let that capability atrophy while waiting for a 2027 rule to formalize it, particularly given how clearly the Fed signaled, through the pilot itself, that this is a direction supervisory expectations are heading.

Beyond the six pilot participants, banks more broadly have reason to treat climate scenario capability as a strategic head start rather than a compliance deadline to wait out. Regulators internationally — including counterparts at the European Central Bank and Bank of England — have been further along on climate stress testing for several years already, and U.S. banks with global operations are often already subject to some version of these requirements in other jurisdictions. Building consistent internal capability now, rather than scrambling once a U.S. requirement is finalized, is simply a more defensible risk-management posture.

The International Backdrop Banks Are Already Living With

The U.S. isn't operating in a vacuum on this issue, and that context is a big part of why globally active banks are treating climate scenario capability as more urgent than the domestic regulatory timeline alone might suggest. The Bank of England ran its own biennial exploratory scenario on climate-related financial risks with major UK banks and insurers years before the Fed's 2023 pilot even launched, and the European Central Bank has run its own climate stress tests across the euro area banking sector on a broadly similar timeline. For a U.S. bank with meaningful European or UK operations, climate scenario analysis isn't a hypothetical future requirement — it's already a live supervisory expectation in at least part of the institution's footprint.

That reality creates a natural spillover effect. Risk teams built to satisfy a UK or EU climate stress-testing mandate don't stay walled off from the rest of a global bank's risk function, and methodology, data infrastructure, and modeling expertise developed for one jurisdiction's requirement tend to get reused and adapted for internal U.S. risk management even before any domestic rule formally requires it. Given that all six of the Fed's pilot participants operate substantial international businesses, it's plausible that existing European and UK climate-testing infrastructure contributed to whatever internal capability each bank brought into the 2023 exercise, even though the Fed's published findings focused on describing the resulting inconsistency across banks rather than diagnosing its specific causes.

What This Means for Bank Capital Planning

For banks watching this space, the practical takeaway from 2026 isn't "climate stress testing is here" — it's "climate stress testing is coming, on a timeline that's become clearer, and the pilot already showed regulators exactly where the industry's weak points are." Banks that treat the 2023 pilot findings as a checklist — better geospatial and property-level data, clearer internal methodology for translating transition scenarios into balance-sheet terms, more consistent approaches across business lines — are the ones most likely to handle a 2027 framework smoothly rather than being caught flat-footed.

There's also a competitive dimension worth noting. Once climate-related elements do become a formal, binding part of the supervisory framework, banks with more mature internal capability will likely face less disruptive capital adjustments than banks starting from scratch. That's a meaningful strategic incentive to keep building now, independent of whatever the exact final 2027 requirements turn out to be.

What Comes Next

The most concrete near-term signal to watch is how the Fed's two October 2025 stress-testing framework proposals are finalized, and specifically whether the final rules for the 2027 cycle include an explicit climate scenario component, build on the NGFS-style transition scenarios used in the 2023 pilot, or take a different approach entirely. Given how much the pilot exercise emphasized data gaps and methodological inconsistency, it's plausible the initial 2027 framework, if it includes climate elements at all, starts narrower and more standardized than the six-bank pilot's more exploratory scenario design — precisely to avoid baking in the comparability problems the pilot exposed.

For now, the clearest lesson from the Fed's climate stress-testing work to date is that supervisory expectations move in stages: pilot exercise, published findings, framework proposal, and eventually binding rule. The 2023-2024 pilot was stage one. The October 2025 framework proposals are stage two. Whatever lands for the 2027 cycle will be stage three — and banks that used the years in between to genuinely build capability, rather than waiting for a deadline, are the ones best positioned when it arrives.

Frequently Asked Questions

Q1: Did the Federal Reserve's 2026 stress test include a climate risk scenario? A: No. The 2026 annual stress test used only the standard macroeconomic baseline and severely adverse scenarios. Stress capital buffer requirements were held unchanged for 2026 while the Fed finalizes a broader revision to its stress-testing framework, expected to take effect for the 2027 cycle.

Q2: What was the Fed's climate scenario analysis pilot? A: A standalone exercise, not part of the standard annual stress test, conducted in 2023 with six of the largest U.S. banks — Bank of America, Citigroup, Goldman Sachs, JPMorgan Chase, Morgan Stanley, and Wells Fargo. It assessed physical risk through hurricane and real estate shock scenarios, and transition risk through NGFS-based scenarios, with results published in May 2024.

Q3: What did the pilot exercise find? A: Participating banks used inconsistent methodologies, making results difficult to compare across institutions, and the exercise exposed significant data gaps and modeling challenges in estimating the financial impact of long-horizon climate scenarios.

Q4: When will climate risk become a formal part of Fed stress testing? A: No confirmed date has been set. The Fed issued two proposals in October 2025 to revise its broader stress-testing framework, with final rules expected for the 2027 cycle — though it's not yet confirmed whether or how climate-related elements will be incorporated into that revised framework.

Q5: Why are banks preparing for climate stress testing before it's required? A: Banks that participated in the 2023 pilot had to build real scenario-analysis capability from scratch, and letting that capability lapse while awaiting a formal rule would squander a head start. Banks with international operations also often already face climate stress-testing requirements from regulators like the European Central Bank or Bank of England.

Q6: How did U.S. banks perform in the 2026 stress test overall? A: Strongly. The Fed's results showed the largest banks could collectively absorb an estimated $708 billion in losses under a severe hypothetical recession while remaining well capitalized and able to continue lending to households and businesses.