Quarterly stress indices untangle bank capital and earnings risks
Two new quarterly indicators derived from EU-wide stress tests track euro area banking vulnerabilities by separating conditional capital depletion from organic earnings capacity. The metrics identify distinct solvency and profitability pressures across 94 institutions.
Quantifying depletion and earnings tails
The Stress Vulnerability Index (SVI) and Profitability Vulnerability Index (PVI) convert supervisory data into quarterly monitoring tools for euro area banks.
Estimated across 93 banks representing over 75 percent of Significant Institution assets, the SVI uses Bayesian Model Averaging on stress test results from 2018, 2021, and 2023.
Real economy variables dominate capital depletion: a 1 percentage point drop in GDP growth adds 12 to 22 basis points of CET1 depletion, while a 1 percentage point rise in unemployment adds 55 basis points.
Simultaneously, the PVI applies panel quantile regression across 5,130 quarterly observations from 2001 to 2024, tracking the 15th percentile of return on assets to capture margin and income compression.
When solvency risks decouple from profits
While both indices peaked during the Great Financial Crisis and European Sovereign Debt Crisis, their paths diverged during the 2022–2023 monetary tightening.
Rising policy rates widened net interest margins and lowered the PVI below 0.3 for the median bank, yet the SVI rose on borrower solvency fears.
Historical validation confirms that high index readings (exceeding 0.85) reliably forecast public support: a one-unit increase in PVI is associated with a 40 percentage point higher probability of state guarantees, persisting up to five quarters ahead.
Profitability can mask underlying fragility
Relying on current bank profits creates a dangerous blind spot when structural tail risks accumulate.
Separating organic earnings from capital depletion provides regulators with a rigorous analytical anchor.
The framework firmly justifies maintaining capital buffers even during cyclical earnings booms.