How do I identify binding constraints in a stress test?

Question

AcadiFi · Accepted Answer

A binding constraint is the first limit that is breached as stress intensifies, not necessarily the largest dollar loss. The process for identifying binding constraints is a four-step ratio-based triage.

Step 1: enumerate all regulatory and internal constraints with their thresholds — CET1 ratio, Tier 1 leverage, LCR, NSFR, single-name concentration limit, sector concentration, large exposure limit, internal market risk VaR limit, EL/capital coverage, and liquidity gap ladder.

Step 2: compute stressed values of each ratio under the scenario. Express as distance-to-breach in standardized units (e.g., basis points below minimum, or percent of headroom consumed).

Step 3: rank by distance to breach. The constraint with the smallest remaining headroom is the binding constraint. For Copperfield Investment Bank, a severely adverse scenario might show: CET1 falls from 13.5% to 10.8% (binding threshold 10.5%, headroom 30bp), LCR from 130% to 110% (threshold 100%, headroom 10pp), single-name concentration from 18% of Tier 1 to 26% (threshold 25%, headroom -100bp, already breached).

Step 4: sensitivity analysis on the binding constraint — how much additional shock in each risk factor moves the ratio further toward breach. This tells management which hedges or divestitures most effectively relieve the binding constraint.

For FRM exam: recovery actions should directly address the binding constraint first. Actions that only improve non-binding metrics waste scarce time and balance sheet.

How do I identify binding constraints in a stress test?

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