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Stress tests and credit ratings answer different questions. A stress test asks how a bank’s capital would hold up under a defined adverse scenario. A credit rating is an agency’s forward-looking opinion of an issuer’s relative default risk over its chosen horizon. Neither is a guarantee, and the most useful warning usually comes from the pattern across both signals: a shrinking post-stress capital cushion, concentrated losses, funding weakness, and a rating that is moving lower or under review.
Stress tests and credit ratings measure different risks
Comparing a stress-test “pass” with a rating letter as if they were competing grades leads to bad conclusions. The measures overlap because both consider a bank’s ability to absorb losses, but they are designed for different purposes and use different time frames.
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| Signal | Primary question | What it measures | What it does not establish |
|---|---|---|---|
| Regulatory stress test | How would this bank perform in a specified bad scenario? | Projected losses, revenue, expenses, liquidity effects and capital ratios under common assumptions | That the scenario will occur, or that the bank is safe from risks outside the test |
| Credit rating | How does an agency assess this issuer’s relative credit risk? | Estimated likelihood and potential severity of default on an issuer or debt obligation, using qualitative and quantitative analysis | That repayment is guaranteed, that the security is suitable for you, or that liquidity and market risks are covered |
The Federal Reserve describes its stress tests as a way to help ensure that large banks remain capitalized and able to lend to households and businesses during a severe recession. The test begins with a bank’s actual starting balance sheet and applies a hypothetical path for the economy and financial markets. Models estimate losses, revenues, expenses and the resulting capital position.
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How to read a bank stress-test result
Start with the post-stress CET1 ratio
The common headline measure is the projected minimum Common Equity Tier 1 (CET1) capital ratio. CET1 is the highest-quality form of bank capital, and the ratio compares it with risk-weighted assets. A bank that finishes well above the applicable minimum has more modeled loss-absorbing capacity than one that barely clears it.
Do not stop at “passed.” Record three numbers:
- The projected minimum CET1 ratio under the scenario.
- The applicable regulatory minimum for the exercise.
- The percentage-point decline from the starting ratio to the projected low.
The difference between the projected ratio and the minimum is the post-stress buffer. It is not a promise that the same buffer will exist in a different recession. It is a measure of room under the assumptions used by that test.
Identify what consumed the capital
Loss totals are more informative when separated by portfolio. A bank can have a satisfactory overall result while carrying a severe weakness in one business line. Review modeled losses and revenue changes for:
- Commercial real estate, particularly offices or other segments exposed to falling values and refinancing pressure.
- Residential mortgages, including assumptions about unemployment, house prices and borrower equity.
- Credit cards and other consumer lending, where charge-offs can rise quickly when households lose income.
- Corporate lending, including leveraged borrowers and industries sensitive to a recession.
- Trading, counterparty and market exposures, which can react to volatility and liquidity shocks rather than only to loan defaults.
Concentration matters. A large loss in a portfolio that is genuinely small may be less concerning than a moderate loss in the bank’s dominant business. Compare the modeled exposure with the bank’s disclosed balance-sheet mix.
Separate binding tests from exploratory analysis
Not every published stress exercise changes a bank’s capital requirement. The Federal Reserve’s 2025 results included a separate exploratory analysis of nonbank financial institutions. That work did not affect capital requirements. Treating an exploratory result as though it were the binding capital test can exaggerate or understate its significance.
Use the scenario, not just the outcome
Stress tests are conditional calculations. Read the assumptions for unemployment, inflation, interest rates, asset prices, exchange rates and market volatility before comparing banks. A “pass” under a mild scenario cannot be compared directly with a “pass” under a much harsher one.
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The European Banking Authority describes EU-wide tests as bottom-up exercises using common methodologies, scenarios and key assumptions developed with the European Systemic Risk Board, the European Central Bank and the European Commission. That common framework improves comparability within the tested population, but it does not turn the scenario into a universal forecast.
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Understand what the letter means
A rating is an agency’s opinion of relative credit risk for an issuer or a particular debt obligation. The obligation’s seniority, collateral, guarantees and recovery prospects can make its rating differ from the parent bank’s issuer rating.
Historical default statistics illustrate the direction of the scale but do not predict an individual bank. S&P Global Ratings reported three-year cumulative default rates of 0.91% for BBB, 4.17% for BB, 12.41% for B and 45.67% for CCC/CC in its 2024 data. Those are historical group rates, not probabilities that a specific bank will default during the next three years.
Watch the direction and rationale
A rating can remain unchanged while its risk assessment deteriorates. Read the outlook and watch status alongside the letter:
- Negative outlook: the agency sees a greater possibility of a downgrade over its stated review horizon.
- Watch for downgrade: a nearer-term event or development could lead to a rating action.
- Repeated downgrades: a sequence can show that risks are becoming harder to contain, even when each individual move is small.
- Stable outlook: this is not a guarantee that the rating will not change and does not mean the bank has no material risks.
Read the agency’s reasons. Common drivers include asset quality, earnings, capitalization, business-model concentration, governance, government support assumptions and funding access. A negative action caused by weaker profitability is a different warning from one caused by rapidly deteriorating liquidity.
Know the rating’s limits
The SEC says ratings are not investment advice and do not guarantee repayment. A rating normally focuses on credit risk, not every risk that can affect a bank’s share price, bond price or ability to operate. Liquidity, market and interest-rate risk may require separate analysis. Rating agencies can also change a rating without warning, and an outlook or watch does not precede every action.
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The warning signs that deserve the most weight
1. A thin post-stress capital buffer
Among stress-test disclosures, the most actionable comparison is the distance between the projected minimum capital ratio and the applicable minimum. A narrow margin leaves less modeled room for an untested shock, a forecasting error or a weaker starting balance sheet. Compare the buffer with prior years only after checking whether the methodology and scenario changed.
2. Large capital depletion or concentrated losses
A substantial fall in CET1, even if the final ratio remains above the minimum, deserves attention. Then locate the losses. If commercial real estate, consumer credit, corporate loans or trading exposures account for most of the depletion, ask whether that portfolio is expanding, unusually concentrated or funded with short maturities.
3. Funding and liquidity vulnerability
Capital and liquidity are not substitutes. A bank may be solvent on an asset-value basis yet struggle to meet withdrawals or collateral calls. Examine deposit stability, the share of uninsured or concentrated deposits, wholesale-funding dependence, collateral availability and the maturity mismatch between assets and liabilities.
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A credit rating does not automatically answer those questions. A bank can retain a high rating while a fast-moving funding problem develops, especially because ratings are not real-time liquidity indicators.
4. Risks missing from the scenario
Ask whether the exercise includes the exposures that matter most for the bank. A test may not capture a new technology failure, a particular form of run, a geopolitical shock, a novel trading strategy or a rapid change in regulation. The absence of a risk from the scenario is not evidence that the risk is immaterial.
5. Rating deterioration
A negative outlook, downgrade watch or repeated downgrade can be an earlier qualitative warning than the next annual stress-test publication. Ratings incorporate information that may not appear in a standardized scenario, including management decisions, competitive pressure, governance concerns and funding access.
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6. A widening gap between agencies
When one agency moves a bank lower and another remains unchanged, do not automatically choose the more favorable view. Compare the agencies’ stated assumptions, time horizons and treatment of government support, asset quality and liquidity. The disagreement itself can identify an uncertainty that needs investigation.
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When the signals disagree
Strong stress-test pass, weakening rating
This combination can indicate risks outside the test, a funding or business-model concern, or a difference in time horizon. For example, the scenario may show that capital survives a recession while an agency is worried about deposit outflows, weak earnings or concentrated commercial real estate refinancing over the next year.
Read the rating action first, then check whether the cited risk appears in the stress-test assumptions. If it does not, the apparent contradiction is often a scope difference rather than an error.
Stable rating, weak stress-test buffer
A stable rating with a small post-stress cushion can mean the agency does not expect default risk to rise materially over its horizon, even though the bank is vulnerable under the regulator’s chosen scenario. It can also mean that management has time to raise capital or reduce risk before the scenario becomes reality. Treat the narrow buffer as a resilience warning, not as proof of imminent default.
Both signals deteriorate
The most serious pattern is a shrinking stress-test buffer alongside a negative outlook, downgrade watch or actual downgrade, especially when both point to the same portfolio or funding weakness. Confirm that the dates and horizons line up, then review liquidity disclosures and recent capital actions.
A practical method for comparing two banks
- Define the object of comparison. Decide whether you are assessing the bank as an issuer, a particular bond, or the institution’s ability to operate. A bond rating can differ from an issuer rating.
- Align dates. Record the stress test’s data year, publication date and projection horizon, then record the rating’s action date, outlook and stated horizon.
- Compare scenarios. Note the recession, rates, unemployment, asset-price and market assumptions. Do not rank results from materially different scenarios as though they were standardized.
- Calculate the capital cushion. Subtract the applicable minimum from each bank’s projected minimum CET1 ratio. Also record the starting ratio and the percentage-point depletion.
- Map loss concentration. List the three portfolios producing the largest losses and compare them with each bank’s actual exposure and strategy.
- Check liquidity separately. Review deposit composition, wholesale funding, collateral and maturity gaps. A rating and a stress-test capital ratio do not replace this step.
- Read the rating rationale. Identify whether the agency cites asset quality, earnings, capital, governance, business concentration, support assumptions or funding.
- Classify the result. Mark each signal as improving, stable, weakening or unclear, and note whether the test component is binding or exploratory.
| Comparison axis | Questions to answer | Why it matters |
|---|---|---|
| Scenario and horizon | How severe is the scenario, and through what year are losses projected? | A harsher or longer scenario can produce a lower ratio without implying a weaker starting bank. |
| Capital buffer | How far is the projected minimum above the requirement? | A larger cushion generally gives more room for unmodeled losses. |
| Loss concentration | Which portfolios consume capital? | Concentration can make a specific shock more damaging than the headline total suggests. |
| Liquidity and funding | How stable are deposits and how much short-term or wholesale funding is used? | Funding stress can develop faster than accounting losses. |
| Rating direction | Is the outlook negative, is the issuer on watch, or have downgrades repeated? | Direction can reveal deterioration before the next standardized test. |
| Methodology | What does each agency include, and what time horizon does it use? | Different methods explain apparent disagreements. |
| Regulatory status | Is the analysis a binding capital exercise or exploratory work? | Only the binding component directly affects the applicable capital requirement. |
What the major 2025 exercises actually show
Federal Reserve exercise
The Federal Reserve’s 2025 exercise covered 22 large banks. It reported approximately $550 billion in hypothetical losses, while every tested bank remained above minimum capital requirements. The result demonstrates resilience under that specified scenario; it does not guarantee that those banks would withstand a different shock, a run on deposits or a risk omitted from the models.
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European Central Bank exercise
The ECB’s 2025 euro-area exercise used 2024 year-end data, projected capital through 2027 and directly covered 51 significant institutions supervised by the ECB. Compare those results within the tested population and against the published assumptions. Do not treat the figures as directly interchangeable with the Federal Reserve exercise, because the institutions, framework and scenario differ.
Why a bank can pass and still be risky
- Model risk: projected losses depend on models, bank submissions and assumptions about borrower behavior and market prices.
- Starting-data risk: an error or lag in the balance-sheet data can make the projected path look safer than current conditions.
- Scenario risk: the exercise may be less severe than the shock a reader is worried about.
- Horizon risk: resilience through the test horizon does not establish resilience afterward.
- Business-model risk: a bank may face strategic, governance or earnings pressure that is not captured by the capital scenario.
- Liquidity risk: a bank can meet a capital test while facing rapid deposit withdrawals or collateral calls.
- Transmission risk: losses may spread through counterparties or markets in ways not represented in the exercise.
The converse is also true: a low stress-test buffer does not automatically mean default is near. Management can raise capital, retain earnings, sell assets or change the balance sheet. The test is a resilience measurement under conditions, not a default forecast.
Common mistakes and better alternatives
| Mistake | Better approach |
|---|---|
| Choosing the bank with the highest rating without reading the outlook | Read the level, outlook, watch status and reasons together. |
| Calling every stress-test pass “safe” | Report the post-stress ratio, minimum and capital depletion. |
| Comparing headline loss totals across jurisdictions | Align scenarios, institutions, data dates and methodologies first. |
| Assuming a rating covers liquidity | Review deposits, wholesale funding, collateral and maturities separately. |
| Ignoring concentrated losses because the total capital ratio passes | Trace losses to portfolios and compare them with the bank’s actual exposures. |
| Treating exploratory analysis as a capital requirement | Confirm whether the regulator says the component is binding or exploratory. |
| Using historical default rates as an individual forecast | Use them only as broad context and examine the agency’s current rationale. |
A decision framework for depositors, bondholders and shareholders
Depositors
Focus first on the protection that applies in your jurisdiction, the account’s coverage limits, the bank’s liquidity and the stability of its funding. A stress-test capital ratio and an issuer rating provide context but do not replace understanding deposit insurance or access to funds.
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Start with the rating of the specific issue, not only the parent bank. Check seniority, maturity, call features, loss-absorption terms and the agency’s recovery assumptions. Then compare the bank’s post-stress capital buffer and funding profile with the bond’s maturity. A high rating cannot eliminate price loss if market rates rise or liquidity dries up.
Shareholders
Look beyond default risk. Earnings sensitivity, dilution from capital raising, trading losses, loan growth, governance and regulatory restrictions can affect equity value even when a bank remains comfortably above minimum capital requirements. Stress-test results help frame downside resilience; they are not a valuation model.
How often should you check each signal?
Stress tests are periodic and their publication dates vary by regulator. Use the latest completed exercise, but also monitor quarterly capital, earnings, loan-quality and funding disclosures for changes between cycles. Ratings can change at any time, so review new outlooks, watches and actions when they are announced rather than waiting for the next annual test.
When a new test is released, preserve the old result and compare the change in scenario, starting capital, projected minimum and loss composition. A lower ratio may reflect a harsher scenario rather than deterioration; a similar ratio may conceal a weaker starting position if the scenario became easier.
Bottom line: treat the pattern as the warning
Neither measure deserves to be treated as a single “trust” score. Stress tests are strongest for showing how a bank’s capital responds to a defined shock. Ratings are strongest for summarizing an agency’s relative view of default risk and changes in the issuer’s credit story. The warning sign that matters most is convergence: a thin or shrinking post-stress buffer, concentrated or rising losses, evidence of funding strain, important risks absent from the scenario, and a rating moving to negative outlook, downgrade watch or lower levels.
Read the assumptions and the agency rationale before drawing a conclusion. A pass is conditional, a rating is an opinion, and both become more useful when you understand exactly what each one includes—and what it leaves out.
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