What is maturity transformation and why is it risky yet necessary?

Question

AcadiFi · Accepted Answer

Maturity transformation is the core banking function of funding long-duration assets with short-duration liabilities, capturing the term premium embedded in the yield curve. A bank might issue 90-day deposits paying 3% and originate 5-year small-business loans yielding 7%, pocketing a 4% net interest margin. This intermediation provides essential economic value: depositors gain liquidity, borrowers gain long-term financing, and the bank earns the spread.

The risk emerges in three forms:
1. **Liquidity risk** — depositors can withdraw instantly; loans can't be called. A mass withdrawal creates a funding gap.
2. **Interest-rate risk** — rising rates increase deposit cost faster than loan yields adjust, compressing margins. Duration gap quantifies this.
3. **Rollover risk** — short-term wholesale funding (CDs, repos) may not roll over in stress.

Example: Cathornet Community Bank holds $3.2B in 7-year fixed-rate loans funded by $2.6B in 6-month CDs and $0.6B in equity. Duration of assets ≈ 5.5, duration of liabilities ≈ 0.5, weighted duration gap = (5.5 - 0.81·0.5) = 5.1. A 100-bp rate shock cuts equity by $3.2B·0.01·5.1 / 1 = $163M, or about 25% of capital.

```mermaid
flowchart LR
    A[Short deposits] --> B[Bank]
    B --> C[Long loans]
    B --> D[Net interest margin]
    E[Rate shock] --> F[Margin compression]
    G[Run] --> H[Fire sale]
```

Regulators address this via LCR (30-day stress), NSFR (1-year stable funding), and stress tests. Firms like Ostria Banking Solutions model duration gap, deposit beta, and run-off curves to manage transformation risk within appetite.

What is maturity transformation and why is it risky yet necessary?

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