What is economic capital, how does it differ from regulatory capital, and why do banks calculate both?

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AcadiFi · Accepted Answer

**Economic capital (EC)** is the amount of capital a bank determines it needs — based on its own internal models and risk appetite — to absorb unexpected losses at a chosen confidence level (typically 99.9% or 99.97%) over a one-year horizon. **Regulatory capital** is the minimum required by Basel rules. **Key Differences** | Dimension | Economic Capital | Regulatory Capital | |---|---|---| | **Defined by** | Bank's internal models | Basel Committee / national regulators | | **Confidence level** | Bank-chosen (often 99.9%-99.97%) | Implicit ~99.9% in IRB formulas | | **Risk coverage** | All material risks including concentration, strategic, reputational | Credit, market, operational (Pillar 1) | | **Correlation assumptions** | Bank's own estimates | Prescribed by Basel formulas | | **Diversification** | Full cross-risk diversification | Limited — Pillar 1 risks summed | | **Purpose** | Internal risk management, performance measurement, pricing | Compliance with minimum standards | **Why Banks Need Both** ```mermaid flowchart LR A["Regulatory Capital"] --> B["Floor: minimum to stay in business"] C["Economic Capital"] --> D["Ceiling: target based on risk appetite"] B --> E["Bank holds: max of regulatory and economic"] D --> E E --> F["Plus management buffer"] ``` 1. **Regulatory capital may understate true risk** — Basel formulas use standardized correlation assumptions and don't capture concentration risk. A bank with 40% of its portfolio in one industry may find EC >> regulatory capital. 2. **Regulatory capital may overstate true risk** — Basel doesn't allow full cross-risk diversification. A bank with naturally hedged market and credit positions may find EC << regulatory capital. **Worked Example** Westmark National Bank calculates both frameworks: | Risk Type | Regulatory Capital | Economic Capital | |---|---|---| | Credit risk | $4,200M | $3,800M | | Market risk | $680M | $520M | | Operational risk | $1,100M | $950M | | Concentration risk | Not captured | $600M | | Interest rate in banking book | Not in Pillar 1 | $350M | | **Sum (undiversified)** | **$5,980M** | **$6,220M** | | Cross-risk diversification benefit | Not allowed | -$870M | | **Total** | **$5,980M** | **$5,350M** | Westmark must hold at least $5,980M (regulatory) but internally believes $5,350M is adequate (economic). The bank holds the higher figure plus a management buffer of $800M, targeting $6,780M. **EC in Performance Measurement** Economic capital enables **risk-adjusted performance measurement** by allocating capital to business units based on their risk consumption: - Revenue = $340M, Economic Capital consumed = $2,100M - RAROC = $340M / $2,100M = 16.2% - If hurdle rate is 12%, the business unit creates value **Exam Points:** - EC is the denominator in RAROC calculations - Banks calibrate EC to their target credit rating (AA = ~99.97% confidence) - Pillar 2 (ICAAP/SREP) is where regulators review the bank's EC framework For more on bank capital management, visit our FRM Part II materials.

What is economic capital, how does it differ from regulatory capital, and why do banks calculate both?

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