CRD Stress Testing: Mastering Supervisory and Internal Stress Tests

Stress testing under the CRD/CRR framework assesses whether a bank's capital position can withstand severe but plausible macroeconomic and financial shocks. It covers two dimensions: supervisory exercises such as the EU-wide EBA stress test and ECB-coordinated tests for significant institutions, and internal stress tests that every institution must run as part of its ICAAP under SREP requirements. Large, significant institutions participate directly in the EBA exercise, while smaller banks are typically covered by national supervisory tests or must demonstrate robust internal stress testing capabilities. In practice, every CRR institution needs stress testing capabilities proportionate to its size and risk profile — including scenario design, data infrastructure, modelling capacity and governance. The results feed directly into supervisory assessments and capital planning.

Preparation should start well before the official launch, because most difficulties arise from data and process gaps rather than methodology.

🔍 Key preparation areas:

Institutions that treat the stress test as a repeatable process rather than a one-off project reduce effort significantly in subsequent exercises and face far fewer supervisory findings.

Stress test results do not translate mechanically into binding capital requirements, but they carry significant supervisory weight. Supervisors use the results — in particular the capital depletion in the adverse scenario — as a key input for the Pillar 2 Guidance (P2G), which sets the expectation for capital held above binding requirements. Weak results can also influence the SREP assessment, intensify supervisory dialogue and, in severe cases, lead to restrictions on distributions or demands to strengthen capital planning. Internally, results should feed into capital planning, risk appetite and recovery planning. This is why interpretation matters as much as calculation: institutions need to explain their results, identify the drivers of capital depletion and demonstrate credible management actions.

Supervisory stress tests follow a prescribed methodology with fixed scenarios, constrained assumptions and standardised templates — the priority is comparability across institutions. Internal stress tests under ICAAP are the opposite: they must reflect your specific business model, risk profile and vulnerabilities. Supervisors expect institutions to design their own adverse scenarios, apply institution-specific assumptions and use the results in actual decision-making — capital planning, limit setting and strategic discussions. A common weakness we observe is that internal stress tests simply replicate the supervisory exercise, which supervisors increasingly criticise in the SREP. Effective internal frameworks combine severe but plausible macro scenarios, idiosyncratic scenarios and reverse stress tests to identify breaking points, with clear links from results to management actions.

Climate risk has become a firm component of the supervisory stress testing agenda. Under CRD VI, ESG risks must be embedded in risk management and supervisory review, and supervisors expect institutions to assess both physical risks (extreme weather, chronic climate change) and transition risks (policy, technology, market shifts) over short- and long-term horizons. The practical challenges are considerable: climate scenarios require new data — counterparty emissions, energy efficiency of collateral, sector exposures — projection horizons well beyond classical stress testing, and methodologies that link climate pathways to credit and market risk parameters. We support institutions in building climate scenario capabilities pragmatically: starting with materiality assessments and available data, then progressively refining models as data quality and supervisory expectations evolve.