What is the ICAAP under Pillar 2, and how does it differ from Pillar 1 minimum capital?

Question

AcadiFi · Accepted Answer

The ICAAP is a bank's own comprehensive assessment of whether its capital is adequate for ALL material risks — not just the risks captured by Pillar 1 formulas. It is one of the most important regulatory processes a bank undertakes.

## Pillar 1 vs. Pillar 2

| Feature | Pillar 1 | Pillar 2 (ICAAP) |
|---|---|---|
| Scope | Credit, Market, Operational risk only | ALL material risks |
| Methodology | Standardized formulas or approved models | Bank's own assessment |
| Output | Minimum RWA + capital ratios | Total capital need (often higher) |
| Enforcement | Automatic (regulatory minimum) | Supervisory review (SREP) |

## Risks Covered by ICAAP Beyond Pillar 1

**1. Interest Rate Risk in the Banking Book (IRRBB)**
Pillar 1 does not capture the risk that a bank's net interest income or economic value of equity declines when rates move. ICAAP must quantify this.

**2. Concentration Risk**
Pillar 1 treats each loan independently. ICAAP must assess name concentration (large single exposures), sector concentration, and geographic concentration.

**3. Business/Strategic Risk**
The risk that a bank's business model becomes unviable — e.g., revenue declines due to fintech competition or regulatory changes.

**4. Reputational Risk**
Customer attrition, funding cost increases, or regulatory scrutiny following negative publicity.

**5. Liquidity-Related Risks**
While Pillar 1 focuses on solvency, ICAAP connects capital adequacy to liquidity stress scenarios.

**6. Model Risk**
The risk that Pillar 1 internal models themselves are inaccurate.

## The ICAAP Process

```mermaid
flowchart TD
    A["1. Risk Identification
Catalogue ALL material risks"] --> B["2. Risk Quantification
Compute capital need per risk"]
    B --> C["3. Capital Planning
3-5 year projections
under base + stress"]
    C --> D["4. Stress Testing
Severe but plausible scenarios"]
    D --> E["5. Board Approval
Senior management sign-off"]
    E --> F["6. Submit to Supervisor"]
    F --> G["7. SREP Review
Supervisor sets Pillar 2 add-on"]
    G --> H["8. Pillar 2 Capital
Requirement (P2R)"]
```

## Supervisory Review (SREP)

After receiving the ICAAP, the supervisor conducts its own assessment (SREP — Supervisory Review and Evaluation Process):

1. Evaluates the quality of the bank's ICAAP methodology
2. Challenges assumptions and stress scenarios
3. Compares to peer banks
4. Sets a **Pillar 2 Requirement (P2R)** — an additional capital charge on top of Pillar 1
5. May also set **Pillar 2 Guidance (P2G)** — a non-binding buffer

## Example Capital Stack

Belmont National Bank's capital requirements:

| Component | CET1 Requirement |
|---|---|
| Pillar 1 minimum | 4.50% |
| Capital conservation buffer | 2.50% |
| Pillar 2 Requirement (P2R) | 2.00% |
| Countercyclical buffer | 0.50% |
| G-SIB surcharge (if applicable) | 1.50% |
| **Total CET1 requirement** | **11.00%** |
| Pillar 2 Guidance (P2G) | 1.25% |
| **Total including guidance** | **12.25%** |

The P2R of 2.00% was set by the supervisor based on the ICAAP, reflecting risks not captured in Pillar 1 — particularly IRRBB and concentration risk.

**FRM exam tip:** Know the distinction between Pillar 2 Requirement (binding, breach triggers restrictions on distributions) and Pillar 2 Guidance (soft target, no automatic consequences for breach).

For more on bank regulation, explore our FRM Part II course.

What is the ICAAP under Pillar 2, and how does it differ from Pillar 1 minimum capital?

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