Skip to content

FRM Exam Part I · Stress Testing

Regulatory Stress Testing: CCAR, DFAST and EBA Explained

Updated 11 October 2026 · Fact-checked

Regulatory stress testing is a supervisor-run exercise that projects a bank's losses, revenues and capital under a hypothetical severe macroeconomic scenario. You solve questions by tracing the scenario to losses and pre-provision net revenue, computing the minimum projected capital ratio, and comparing it with the regulatory minimum plus buffers.

Understand Regulatory Stress Testing (CCAR, DFAST, EBA)

A supervisory stress test asks one question: if a severe recession hit, would this bank still have enough capital to keep lending? The regulator, not the bank, sets the scenario and often runs its own models for comparison. This gives a consistent view across banks.

In the US, two programs are linked. DFAST (Dodd-Frank Act Stress Test) projects capital under supervisory scenarios using common assumptions, such as a standardized capital action assumption. CCAR (Comprehensive Capital Analysis and Review) goes further. It also judges the bank's own capital planning process and the bank's planned capital actions, such as dividends and buybacks. In short, DFAST is mainly a forward-looking quantitative test, while CCAR also looks at planning, governance and planned distributions.

The scenarios are macroeconomic paths for variables such as GDP, unemployment, house prices, equity prices, interest rates and credit spreads. The US Federal Reserve typically publishes a baseline scenario and a severely adverse scenario. The severely adverse one is a deep recession with sharp rises in unemployment and large falls in asset prices. Projections usually cover a nine-quarter horizon.

For each quarter the bank projects pre-provision net revenue (PPNR), loan losses, trading and counterparty losses, and other items. Net income feeds into projected capital, and risk-weighted assets are projected as well. The key output is the minimum capital ratio over the horizon. This is compared with regulatory minimums. In the US, results feed the stress capital buffer (SCB), which is set from the peak-to-trough decline in the CET1 ratio under the severely adverse scenario plus planned dividends, with a floor. Banks that fall short face limits on distributions.

In Europe, the EBA coordinates EU-wide stress tests, run by banks using a common methodology and constraints, with results challenged by supervisors. These tests are typically used as an input to the supervisory review process, and are not a simple pass/fail test. Results inform supervisory capital expectations (Pillar 2 guidance) rather than a single formula-driven buffer.

Key formulas to remember

Net income under stress
Net income = PPNR − provisions/loan losses − other losses (trading, counterparty, operational) − taxes
PPNR is revenue minus expenses before provisions. Stress usually lowers PPNR as well as raising losses.
Projected capital
Ending CET1 capital = Beginning CET1 + net income − dividends − buybacks ± other adjustments
Capital actions are what CCAR examines; DFAST uses standardized assumptions.
Projected capital ratio
CET1 ratio = CET1 capital ÷ risk-weighted assets
Use the projected RWA for the same quarter, not the starting RWA.
Capital depletion
Decline in ratio = Starting CET1 ratio − Minimum projected CET1 ratio
The minimum over the horizon is used, not the ending value.
Stress capital buffer (US, simplified)
SCB = peak-to-trough CET1 decline (severely adverse) + planned dividends for four quarters as % of RWA, subject to a floor of 2.5%
Stated as a simplified rule. The SCB replaces the fixed 2.5% capital conservation buffer in the US.

How to solve Regulatory Stress Testing (CCAR, DFAST, EBA) questions

Use this order for any numerical or conceptual question on supervisory stress tests.

  1. 1Identify who sets the scenario and which program is being tested: CCAR, DFAST or EBA.
  2. 2Note the scenario: baseline versus severely adverse, and the horizon.
  3. 3Compute stressed net income: PPNR minus losses and provisions, adjusted for taxes if given.
  4. 4Roll capital forward: add net income, subtract dividends and buybacks, using the capital action assumption stated.
  5. 5Project RWA and calculate the capital ratio each quarter, then find the minimum.
  6. 6Compare the minimum or the decline with the requirement: regulatory minimum, buffer or SCB.
  7. 7State the consequence: buffer size, restriction on distributions, or capital raising needed.

Quickest way: Start with the ratio decline

When to use it: Use when the question gives starting and minimum ratios, or asks how the stress test sets a buffer.

  1. Subtract the minimum projected CET1 ratio from the starting ratio to get the decline.
  2. Add planned dividends as a percentage of RWA if the question refers to the SCB.
  3. Check against the floor, then compare the post-stress ratio with the minimum requirement.
  4. For concept questions, remember: DFAST is the standardized quantitative test; CCAR adds capital planning and planned actions.

Common mistakes in Regulatory Stress Testing (CCAR, DFAST, EBA)

  • Treating CCAR and DFAST as the same test.

    Both use the same supervisory scenarios and are run together.

    Fix: Link CCAR to capital planning and planned capital actions with a qualitative component. Link DFAST to a quantitative projection with standardized assumptions.

  • Using the ending capital ratio instead of the minimum ratio.

    Students assume capital is lowest at the end of the horizon.

    Fix: Read the quarterly path and take the trough. The buffer uses the peak-to-trough decline.

  • Ignoring PPNR or assuming it stays constant.

    Focus falls on credit losses only.

    Fix: Always check whether revenue falls under stress and expenses change. Net income = PPNR − losses.

  • Assuming risk-weighted assets stay unchanged.

    RWA is taken from the starting balance sheet.

    Fix: Use projected RWA for each quarter when the question gives it. Higher RWA lowers the ratio.

  • Treating EBA tests as a pass/fail test with a fixed buffer.

    US buffer logic is applied to Europe.

    Fix: Remember the EBA tests are EU-wide with a common methodology, and results feed supervisory review and capital guidance rather than a single formula.

  • Confusing a supervisory stress test with the bank's own internal stress test.

    Both use scenarios and capital projections.

    Fix: Supervisory tests use regulator-set scenarios for comparability. Internal tests are designed by the bank for its own risks and should complement the supervisory ones.

Worked examples

Example 1

A bank has CET1 capital of $40 billion and RWA of $400 billion. Under a severely adverse scenario, its minimum projected CET1 ratio is 6.5%. Planned dividends over four quarters are 0.8% of RWA. Using the simplified SCB rule, what is the SCB? (Ignore the floor in your calculation, then apply it.)

Show the solution
  1. Starting CET1 ratio = 40 ÷ 400 = 10.0%.
  2. Peak-to-trough decline = 10.0% − 6.5% = 3.5%.
  3. Add planned dividends: 3.5% + 0.8% = 4.3%.
  4. Apply the floor of 2.5%: 4.3% is above the floor, so it stands.

Answer: SCB = 4.3% of RWA.

Example 2

In a stress test a bank starts with CET1 capital of $20 billion. Over the horizon it has PPNR of $6 billion, loan and other losses of $11 billion, and pays dividends of $1 billion. Ignore taxes. Projected RWA at the end is $200 billion. What is the ending CET1 ratio?

Show the solution
  1. Net income = PPNR − losses = 6 − 11 = −$5 billion.
  2. Ending CET1 = 20 + (−5) − 1 = $14 billion.
  3. Ending CET1 ratio = 14 ÷ 200 = 7.0%.

Answer: The ending CET1 ratio is 7.0%.

Exam tips

  • Know the CCAR versus DFAST contrast in one sentence. It is a favourite conceptual question.
  • When a question gives quarterly ratios, scan for the minimum before doing any arithmetic.
  • Check the units: ratios are percentages of RWA, while income and capital are amounts.
  • Remember that a severely adverse scenario is not a forecast. It is a hypothetical severe stress used to test resilience.
  • Stress test results are a supervisory input to capital requirements and do not replace the minimum requirements.

Practice questions from Stress Testing

Regulatory Stress Testing (CCAR, DFAST, EBA) in other exams

The same ground in other exams, if you are preparing for more than one or want another angle on it.

Regulatory Stress Testing (CCAR, DFAST, EBA): frequently asked questions

What is the difference between CCAR and DFAST?

DFAST is a quantitative forward-looking test of capital under supervisory scenarios, using standardized capital action assumptions. CCAR also assesses the bank's capital planning process and its planned capital distributions. Both rely on the same supervisory scenarios.

What is a severely adverse scenario?

It is a hypothetical deep recession set by the supervisor, with sharp rises in unemployment and falls in house and equity prices. It is designed to test whether a bank can keep operating and lending under stress. It is not a prediction.

How do banks use stress test results for capital buffers?

In the US, the decline in the CET1 ratio under the severely adverse scenario, plus planned dividends, sets the stress capital buffer. A bank that falls below its minimum plus buffer faces limits on distributions. Banks also use results to plan capital and risk limits.

How is the EBA stress test different?

The EBA runs EU-wide tests with a common methodology and scenarios that banks apply to their own data, with supervisors challenging results. The outcomes are used in supervisory review and capital guidance rather than to set a single formula-based buffer.