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OCC Interest Rate Risk handbook: a practitioner read

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The OCC Interest Rate Risk Handbook: Practitioner's Playbook

If you work at a national bank, the OCC Interest Rate Risk Handbook is your Bible. It's 40 pages of guidance on how to measure, manage, and govern interest rate risk. For a junior ALM analyst, reading and understanding this Handbook is essential. It's the OCC's definition of what "sound" interest rate risk management looks like.

The Handbook is not a regulation (it's not binding law). But OCC examiners use it as the standard. If your bank deviates from it, examiners will ask why. You'd better have a good answer.

The Five Core Sections

1. Management of Interest Rate Risk: Core Concepts

The Handbook starts with philosophy:

"Management of interest rate risk is essential to the safe and sound operation of commercial banks. Interest rate risk arises from the timing of repricing of assets, liabilities, and off-balance-sheet items. Changes in interest rates can adversely affect the bank's earnings (earnings risk) and its economic value (market risk)."

Key concepts:

  • Repricing gap: The difference between assets and liabilities repricing in a given time bucket. A positive gap (assets > liabilities repricing) means you benefit from rates going up.

  • Duration: How sensitive is the market value of an asset to interest rate changes? A 30-year mortgage with 5% coupon has high duration (market value is very sensitive to rate moves). A floating-rate loan with no coupon lock has low duration.

  • Earnings risk: How much will NII change if rates move? If you're asset-sensitive, lower rates hurt NII. If you're liability-sensitive, higher rates hurt NII.

  • Economic (market) value risk: How much will the bank's equity value change if rates move? This is EVE analysis.


The Handbook emphasizes: "Banks should not take interest rate risk passively. Interest rate risk should be actively managed to support the bank's strategic objectives."

Translation: You should have a view on rates. You should position accordingly (within policy limits). But you should do it deliberately and understand the risks.

2. Interest Rate Risk Measurement

The Handbook identifies four methodologies:

a) Gap Analysis

Create time buckets (0-3 months, 3-6 months, 6-12 months, 1-3 years, 3-5 years, 5+ years).
For each bucket, calculate:

  • Rate-sensitive assets: loans and securities repricing in that bucket

  • Rate-sensitive liabilities: deposits and wholesale funding repricing in that bucket

  • Gap: RSA - RSL


Example:
``
0-3 months: RSA = $10B, RSL = $8B, Gap = +$2B (asset-sensitive)
3-6 months: RSA = $9B, RSL = $7B, Gap = +$2B
6-12 months: RSA = $8B, RSL = $10B, Gap = -$2B (liability-sensitive)
`

If rates rise, you earn more on the +$2B gap in months 0-3 (your assets reprice up faster than your liabilities). In months 6-12, you lose (your liabilities reprice up faster than your assets).

Gap analysis is intuitive but crude. It assumes all repricing is immediate and doesn't account for duration.

b) Duration Analysis

Duration is more sophisticated. It measures the weighted average time to repricing of cash flows.

Formula:
`
Duration = sum(t * CF_t) / sum(CF_t)
where t = time period, CF_t = cash flow in period t
`

Example: A 30-year mortgage with 5% coupon and current yield of 5%:

  • Pays $50k/year for 30 years

  • Duration ≈ 8-9 years (the cash flows are weighted toward early years due to amortization)


If rates rise 1%, the market value of the mortgage falls ~8-9%. This is duration risk.

Duration gap:
`
Duration Gap = Duration(Assets) - Duration(Liabilities)
``

If duration of assets is 5 years and duration of liabilities is 2 years:

  • A 1% rate rise causes assets to fall 5% in value

  • Liabilities fall 2% in value

  • Net effect: equity falls 3% in value


This is more accurate than gap analysis because it accounts for the timing of cash flows.

c) Scenario Analysis

The Handbook recommends stress-testing under various scenarios:

  • Parallel shift: All rates move up or down equally (Fed raises rates uniformly)

  • Non-parallel shifts: Short rates move different from long rates (yield curve flattens or steepens)

  • Bank-specific scenarios: Based on the bank's actual risk profile


Example:
  • Scenario 1: +200 bps parallel shift (all rates up 2%)

  • Scenario 2: -200 bps parallel shift (all rates down 2%)

  • Scenario 3: Yield curve flattens (short rates +100, long rates -50)

  • Scenario 4: Yield curve steepens (short rates -50, long rates +100)

  • Scenario 5: Bank-specific (our bank's deposit betas rise from 70% to 85%; our mortgages prepay faster)


For each scenario, calculate EVE impact and NII impact.

d) Value-at-Risk (VAR)

Optional methodology. VAR models the probability distribution of outcomes. "We are 95% confident that a 1-day loss from interest rate moves will not exceed $X."

VAR is more sophisticated but not commonly used for ALM (it's more trading-focused). The Handbook mentions it but doesn't require it.

3. Management and Governance

The Handbook is very clear on governance:

"The board of directors should establish a clear interest rate risk policy that outlines the bank's tolerance for interest rate risk. The policy should be specific, measurable, and enforceable."

Specifically:

  • Board approval: The IRR policy must be approved by the board (not just ALCO)
  • Specific limits: "EVE should not decline by more than X% of capital under a Y bps shock." Not vague.
  • Independent oversight: Someone other than the risk-takers (Treasury) must oversee the policy (Risk Committee)
  • Regular reporting: ALCO should review metrics at least quarterly (monthly is better)
  • Annual review: The policy should be reviewed annually
  • Escalation: Breaches must be escalated and remediated
"Management should ensure that the measurement and management of interest rate risk are integrated throughout the bank. This includes loan pricing, funding decisions, and investment portfolio management."

Translation: Every business line should understand how their decisions affect balance sheet interest rate risk.

4. Assumptions and Estimation

This section is critical. The Handbook outlines assumptions that should be validated:

Deposit repricing and behavior:

  • "Demand deposits should be treated conservatively. Even if they are non-interest-bearing, they will reprice if competitors offer rates."

  • "The bank should estimate deposit beta based on historical experience and peer comparison."

  • "In stress scenarios, deposit behavior may change materially."


Loan repricing:
  • "Fixed-rate loans reprice only at maturity or prepayment."

  • "ARMs reprice according to index and margin. The bank should model repricing lag (e.g., 1-3 month lag between index move and rate adjustment)."

  • "Prepayment assumptions should be based on historical experience and industry models."


Mortgage prepayment:
  • "As rates fall, prepayments accelerate. The bank should model prepayment risk."

  • "Factors affecting prepayment: interest rate change, seasoning of mortgage, seasonal patterns, economic conditions."

  • "A reasonable prepayment model uses S-curve relationships (slow acceleration of prepayments until rates fall significantly, then rapid acceleration)."


Customer behavior:
  • "Customers may not reprice in lockstep with market. Model repricing lags."

  • "Relationship depositors (small business) are stickier than rate-chasers (large corporations)."


5. Risk Limits and Tolerances

The Handbook provides guidance on reasonable limits:

EVE sensitivity:

  • "A limit of 10-15% of capital for a 200 bps shock is typical for regional banks."

  • "Large, sophisticated banks with active hedging programs may have tighter limits (5-10%)."

  • "Community banks may have looser limits (15-20%)."


NII sensitivity:
  • "A limit of 5% for a 200 bps shock is reasonable."

  • "Some banks use earnings-at-risk (EAR) limits instead: NII volatility should not exceed X% of expected net income."


Duration gap:
  • "Some banks use duration gap limits: the absolute value of duration gap should not exceed 2-3 years."

  • "This is a secondary metric, not as important as EVE."


How to Use the Handbook as an ALM Professional

1. Read it. Seriously. It's well-written and foundational.

2. Build your models using Handbook guidance. Your EVE model should follow Handbook methodology (discounted cash flow, proper scenario selection, reasonable assumptions).

3. Document your assumptions against the Handbook. "Our deposit beta is 70%, based on [historical data]. The Handbook suggests deposit betas of 50-80% depending on competitive environment; our 70% is reasonable."

4. When examiners ask questions, reference the Handbook. If an examiner says, "Your IRR policy doesn't have a specific EVE limit," you can say, "You're right, we'll add one. The Handbook suggests 10-15% of capital; we'll propose 12%."

5. Use it to push back on overly conservative constraints. If business lines say your funding allocation is too tight, you can model the EVE impact using Handbook methodology, show it's within policy, and argue for higher allocation.

Takeaway

The OCC Interest Rate Risk Handbook is:

  • The gold standard for interest rate risk management in national banks

  • Specific on measurement methodologies

  • Thorough on assumptions and limitations

  • Clear on governance and limits

  • A document you should reference regularly


If your bank follows the Handbook, you have solid ALM. If you deviate, be prepared to explain why.