How is the exposure measure calculated for the Basel leverage ratio, and why does it include off-balance-sheet items?

Question

AcadiFi · Accepted Answer

The Basel III **leverage ratio** serves as a non-risk-sensitive backstop to the risk-weighted capital framework. Its exposure measure is broader than total assets because it captures risk that on-balance-sheet accounting misses.

**Leverage Ratio Formula**

**Leverage Ratio = Tier 1 Capital / Exposure Measure >= 3%**

(G-SIBs face a 50% surcharge: if G-SIB buffer is 2%, leverage ratio buffer is 1%, for an effective minimum of 3.5% - 4.5%.)

**Exposure Measure Components**

| Component | Treatment |
|---|---|
| **On-balance-sheet assets** | Gross carrying amount (no netting of general provisions) |
| **Derivative exposures** | Replacement cost + potential future exposure (SA-CCR methodology) |
| **Securities financing (repos/SFT)** | Gross value + counterparty credit exposure add-on |
| **Off-balance-sheet (OBS)** | Notional x credit conversion factor (CCF): 10% to 100% |

```mermaid
flowchart TD
    A["Exposure Measure"] --> B["On-Balance-Sheet: $420B"]
    A --> C["Derivatives (SA-CCR): $38B"]
    A --> D["Securities Financing: $52B"]
    A --> E["Off-Balance-Sheet: $65B"]
    B --> F["Total: $575B"]
    C --> F
    D --> F
    E --> F
    F --> G["Tier 1 Capital: $22B"]
    G --> H["Leverage Ratio: $22B / $575B = 3.83%"]
```

**Off-Balance-Sheet CCFs for Leverage Ratio**

| Item | CCF | Reasoning |
|---|---|---|
| Unconditionally cancellable commitments | 10% | Bank can withdraw at any time |
| Other commitments (e.g., undrawn revolvers) | 40% | Borrowers draw during stress |
| Direct credit substitutes (guarantees) | 100% | Full credit exposure |
| Trade finance (letters of credit) | 20-50% | Lower drawdown probability |

**Worked Example**

Ashton National Bank:

| Component | Gross Amount | CCF | Exposure |
|---|---|---|---|
| Total assets | $420B | 100% | $420.0B |
| Derivative replacement cost | $12B | 100% | $12.0B |
| Derivative PFE (SA-CCR) | $26B | 100% | $26.0B |
| Reverse repos | $45B | add-on | $52.0B |
| Undrawn revolving facilities | $110B | 40% | $44.0B |
| Cancellable commitments | $85B | 10% | $8.5B |
| Letters of credit | $25B | 20% | $5.0B |
| Financial guarantees | $12B | 100% | $12.0B |
| **Total Exposure Measure** | | | **$579.5B** |
| **Tier 1 Capital** | | | **$21.5B** |
| **Leverage Ratio** | | | **3.71%** |

At 3.71%, Ashton meets the 3% minimum but may be below its G-SIB surcharge requirement.

**Why Include OBS Items?**

The 2008 crisis showed that off-balance-sheet commitments (SIVs, conduits, undrawn credit lines) can become on-balance-sheet rapidly during stress. Banks that appeared well-capitalized on a simple assets-to-equity basis were actually far more leveraged when accounting for OBS exposures. The leverage ratio closes this gap.

**Key Exam Points:**
- The leverage ratio is intentionally non-risk-sensitive — it catches what risk-based measures miss
- SA-CCR replaced CEM for derivative exposures in 2022
- The denominator is much larger than total assets for banks with large derivatives and OBS books

For more on Basel capital ratios, explore our FRM Part II materials.

How is the exposure measure calculated for the Basel leverage ratio, and why does it include off-balance-sheet items?

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