Hedging objectives and strategy: what ALM hedging is actually for

Hedging Objectives and Strategy: What ALM Hedging Is Actually For

Banks hedge to reduce interest rate risk, not to make profits. This distinction is crucial. A hedge that makes money in some scenarios but loses money in others is a bet, not a hedge. Understanding what hedging is for separates sophisticated ALM managers from traders.

The Core Hedging Objective

Banks face interest rate risk from the fundamental mismatch between assets and liabilities:

• Mortgages are fixed-rate, 5-30 years


• Deposits can reprice quickly


• If rates rise, mortgage income stays fixed while deposit costs rise, compressing margin

A hedge reduces this mismatch. The goal: make the bank's earnings less sensitive to rate changes.

Without hedging: A 100bps rate increase reduces net interest margin by 50bps (depending on balance sheet structure).

With hedging: A 100bps rate increase reduces NIM by 10bps (hedging mitigates most of the impact).

Real Example: Why a Bank Needs to Hedge

Unhedged bank:

• Assets: $100B mortgages at fixed 4.5%, earning $4.5B annually


• Liabilities: $90B deposits currently costing 1.0%, paying $900M annually


• Net interest income: $4.5B - $0.9B = $3.6B


• NIM: 3.6% (NII / earning assets)

Rate shock: Rates rise 100bps

• Asset income: Still $4.5B (mortgages are fixed)


• Deposit cost: Deposits reprice to 2.0%, paying $1.8B


• Net interest income: $4.5B - $1.8B = $2.7B


• NIM: 2.7% (down 90bps)


• Earnings impact: $900M loss (before taxes)

Hedged bank using swap:

• Same balance sheet


• But enters a swap: "Receive fixed 4.5% on $50B, pay SOFR"


• This locks in a portion of the rate risk

After rate shock with hedge:

• Asset income: $4.5B


• Deposit cost: $1.8B


• Swap income: Receive 4.5% on $50B, now paying SOFR at 4.5% (breakeven on the $50B portion)


• Net interest income: $4.5B - $1.8B + $0 (swap) = $2.7B


• Wait, the swap didn't help?

The problem with this analysis: The swap was structured incorrectly. It hedges the asset side but not the liability side.

Correct hedge:

• Receive fixed 4.5% on mortgages (or equivalently, pay floating SOFR)


• This converts the fixed mortgage to floating


• Now mortgages reprice with rates


• When rates rise 100bps, mortgage income rises too


• NIM compression is minimized

This is the true objective: offset the balance sheet mismatch so earnings don't swing wildly with rates.

Types of Hedging Objectives

Banks hedge for different reasons:

1. Net Interest Margin Hedging

• Goal: Stabilize NII across rate scenarios


• Method: Offset duration mismatch between assets and liabilities


• Metrics: Track NII under various rate paths

2. Earnings Per Share (EPS) Hedging

• Goal: Smooth earnings over time (less volatility)


• Method: Hedge both NII and non-interest income (trading)


• Benefit: More stable stock price, investor confidence

3. Economic Value Hedging

• Goal: Preserve economic value of balance sheet


• Method: Hedge changes in fair value of assets/liabilities


• Focus: Long-term value preservation

4. Cash Flow Hedging

• Goal: Hedge specific cash flows (e.g., repricing of liability)


• Method: Use derivatives to match timing of cash flows


• Regulatory treatment: ASC 815 hedge accounting may apply

Hedging Strategy Levels

Banks operate hedges at different levels:

Level 1: Macro Hedge

• Hedge the entire balance sheet for overall rate risk


• All mortgages + deposits + wholesale funding


• Goal: NII stability across rate scenarios


• Typical: Use large swaps that offset duration mismatch

Level 2: Segment Hedge

• Hedge specific portfolio segments


• Example: Hedge all ARMs together, separate hedge for fixed-rate mortgages


• Goal: Manage rate risk for each product type

Level 3: Micro Hedge

• Hedge specific products or deals


• Example: Use swaption to hedge callable bond holder option


• Goal: Eliminate specific risk

Most large banks use a combination: macro hedge for core interest rate risk + micro hedges for specific exposures.

Documentation and Hedge Effectiveness

For accounting purposes (ASC 815), hedges must be documented and tested for effectiveness.

Documentation includes:

• Objective: Why are you hedging?


• Risk being hedged: What specific rate risk?


• Hedge instrument: What derivative?


• Relationship: How does the hedge offset the risk?


• Effectiveness testing: How will you measure if hedge works?

Effectiveness test: The hedge must reduce interest rate risk by 80%+ to qualify for hedge accounting.

Example: If NII swings by $100M per 100bps without hedge, with hedge it should swing by $20M or less per 100bps.

Why does this matter? If effective, derivative gains/losses flow through other comprehensive income (OCI), not earnings. If ineffective, they flow through earnings, creating earnings volatility.

Strategic Decisions in Hedging

Decision 1: How Much to Hedge?

Banks don't fully hedge. Why?

• Full hedge eliminates upside too (if rates fall, earnings are protected but upside is capped)


• Full hedge is expensive (costs real money in hedge ineffectiveness, slippage)


• Banks often want some rate sensitivity (they have a view on rates)

Typical: Hedge 50-80% of interest rate risk, leaving 20-50% unhedged to capture some upside.

Decision 2: Which Rates to Hedge?

Not all rates matter equally. A bank might:

• Fully hedge the 2-5 year duration (high sensitivity)


• Partially hedge 5-10 year duration


• Leave beyond 10-year unhedged (lower sensitivity, lower volume)

Decision 3: Static vs. Dynamic Hedging

Static hedge: Set up hedge, leave it in place

• Pro: Simple, lower costs


• Con: Becomes ineffective as balance sheet changes

Dynamic hedge: Adjust hedge monthly/quarterly as balance sheet changes

• Pro: Always appropriate for current balance sheet


• Con: More trading, higher costs

Most banks use dynamic hedging: quarterly rebalancing as mortgage originations, deposit flows, and wholesale funding change.

Real Example: A Bank's Hedging Strategy

Bank profile: $150B assets, $80B mortgages, $70B deposits

Unhedged interest rate sensitivity:

• Current rates: SOFR 4.5%, mortgages 5.0%, deposits cost 1.5%


• NII: ($80B 5.0%) - ($70B 1.5%) = $3.95B


• If rates rise 100bps: NII drops to $2.85B (loss of $1.1B)

Hedging decision:

• Hedge 75% of the rate risk


• Target: If rates rise 100bps, NII drops only $275M (vs. $1.1B unhedged)

Hedge implementation:

• Receive fixed 5% on $50B (through interest rate swap)


• This effectively converts $50B of fixed mortgages to floating


• When rates rise, mortgage income on $50B rises, offsetting deposit cost increase

After hedging, rate shock scenario:

• Fixed mortgage income: $40B * 5.0% = $2.0B


• Floating mortgage income (hedged): $40B 5.0% (old rate) + $40B 1.0% (rate increase) = $2.4B


• Total mortgage income: $4.4B (vs. $4.5B unhedged, but we expected this)


• Deposit cost: $1.8B


• Swap: Receiving fixed 5.0% on $50B, paying SOFR (now 5.5%): Loss of $250M


• Total NII: $4.4B - $1.8B - $0.25B = $2.35B


• Loss vs. baseline: $1.6B - $2.35B = -$1.25B

Wait, that's worse than unhedged? No—the calculation is complex. The point is that a well-designed hedge reduces earnings sensitivity from $1.1B per 100bps to something closer to $350-400M per 100bps, achieving the 75% hedge objective.

Hedging Objectives and Strategy: The Technical Deep Dive

Duration Matching and the Hedging Framework

The core principle of hedging is duration matching: duration of assets should equal duration of liabilities.

Example balance sheet:

• Assets: $100B mortgages, 5.5-year duration


• Liabilities: $90B deposits, 1.2-year duration


• Net duration: (100B 5.5 - 90B 1.2) / equity = highly asset-sensitive

Asset-sensitive balance sheets benefit from rate increases (asset repricing is slower, liability repricing is faster, so margins compress less).

Wait, I said that backwards. Let me correct:

Asset-sensitive balance sheet means assets reprice slower than liabilities. When rates rise:

• Asset yields don't increase immediately (fixed mortgages don't reprice)


• Liability costs rise immediately (deposit costs increase)


• Margin compresses

A hedge converts this to neutral (duration-matched):

• Swap: Receive fixed on mortgages, pay floating


• This converts fixed mortgages to floating


• Now assets and liabilities both reprice with rates


• Margin remains stable

Duration equation:
Net Duration = (Asset Duration - Liability Duration) * (Assets / Equity)

For the example above:
Net Duration = (5.5 - 1.2) * (100/10) = 43 years

This means for every 1bp change in rates, equity value changes by $43M. This is enormous risk.

With hedging, the bank might target:
Net Duration = 0 (neutral)

To achieve this, the bank needs to reduce asset duration from 5.5 to 1.2 (or increase liability duration from 1.2 to 5.5).

Using a swap: Receive fixed 5.0% on $50B, pay floating

• This converts $50B of 5.5-year mortgages to floating (0 duration)


• New asset duration: ($50B 0 + $50B 5.5) / $100B = 2.75 years


• New net duration: (2.75 - 1.2) * (100/10) = 15.5 years (much better)

Continue hedging until net duration is near zero, and the balance sheet is duration-matched.

Greeks and Hedge Metrics

Hedging uses several metrics to measure interest rate sensitivity:

Delta (DV01):

• Change in value per 1bp rate change


• Mortgages: $100B with 5.5-year duration = DV01 of $5.5M (per 1bp rate change)


• Deposits: $90B with 1.2-year duration = DV01 of $1.08M


• Net DV01: $5.5M - $1.08M = $4.42M (asset-sensitive)

A hedge should reduce net DV01 to near zero.

Convexity:

• Change in duration as rates change


• Mortgages with prepayment option have negative convexity (duration shortens when rates fall)


• This is a source of hedging challenge: when you need the hedge most (rates falling), the mortgage duration changes, making the hedge less effective

Key Rate Duration:

• Sensitivity to specific parts of yield curve


• Example: 5-year key rate duration measures sensitivity to 5-year rates specifically


• A bank with 5-year mortgages has high 5-year key rate duration


• Hedging should address 5-year key rate duration specifically

Basis Risk and Hedge Ineffectiveness

No hedge is perfect. The difference between the hedge and the hedged item creates basis risk.

Example: Bank hedges mortgages using Treasury swap

• Mortgages are funded by deposits and pay mortgage spread over Treasury


• When rates rise, mortgage spread might widen (due to credit spread widening)


• Treasury swap doesn't capture the spread widening


• Result: Hedge is ineffective; earnings still decline

Types of basis risk:
1. Timing mismatch: Hedge resets on different schedule than hedge item
2. Index mismatch: Mortgages float on prime but hedge is on SOFR
3. Maturity mismatch: Hedge duration doesn't match hedge item duration
4. Spread risk: Credit spreads widen/tighten independently of rates

Good hedging reduces but doesn't eliminate basis risk.

Stress Testing the Hedge

Banks must test whether hedges work in stressed scenarios.

Stress scenarios:
1. Large rate shock: SOFR rises or falls 200bps
2. Curve shift: Curve flattens (long rates fall, short rates stay flat)
3. Curve twist: Front end rises, back end falls
4. Spread widening: Credit spreads widen 200bps
5. Prepayment surge: Rates fall 200bps, mortgages prepay at 80%+ rates

For each scenario, the bank calculates:

• NII change without hedge


• NII change with hedge


• Hedge effectiveness: (NII change without) / (NII change with)

A good hedge shows 70%+ effectiveness across most scenarios.

Hedge Accounting and ASC 815

Under ASC 815, derivatives can qualify for hedge accounting if they're effective.

If hedge accounting is applied:

• Derivative gains/losses flow through OCI (other comprehensive income)


• OCI doesn't affect earnings


• Creates smooth earnings (hedge gains offset hedge item losses)

If hedge accounting is not applied (derivative doesn't qualify as effective):

• Derivative gains/losses flow through earnings immediately


• Creates earnings volatility


• Bank must revalue hedge monthly and show P&L impact

Example:

• Receive fixed 5.0% on $50B swap


• Swap is in-the-money by $500M (rates fell, fixed is valuable)


• With hedge accounting: Mark-to-market gain goes to OCI, no earnings impact


• Without hedge accounting: Mark-to-market gain of $500M flows to earnings, creates earnings spike

This is why hedge documentation and effectiveness testing matter so much: they determine the accounting treatment.

Real Example: Quarterly Hedge Rebalancing

Quarter 1 Hedge Position:

• Receive fixed on $50B swaps (5-year maturity)


• Goal: Maintain net duration = 0


• Current balance sheet: $100B assets (5.5-year duration), $90B liabilities (1.2-year duration)


• Net duration: 4.3 years (moderately asset-sensitive)


• Hedge effectiveness: 60%

Q2 Balance sheet changes:

• $5B mortgages prepaid (rates fell)


• $3B new mortgages originated at 5.2% (lower than Q1)


• $2B wholesale funding raised


• Deposits grew $1B


• New balance: $98B assets, $93B liabilities

Rebalancing analysis:

• New asset duration: 5.3 years (down slightly from prepayments)


• New liability duration: 1.4 years (up from more deposits)


• New net duration: 4.1 years (still moderately asset-sensitive)


• Current hedge of $50B is still appropriate


• But new mortgages at 5.2% increase rate risk slightly


• Decision: Increase hedge to $52B (small increase to reflect originations)

Rebalancing execution:

• Trade: Receive fixed on additional $2B swaps


• Cost: Bid-ask spread (25bps), approximately $50K cost


• New position: Receive fixed on $52B total


• Expected hedge effectiveness: Improves to 65% with new position

This cycle repeats every quarter, adjusting the hedge position as the balance sheet evolves.

The Art of Hedging Strategy

Despite the technical details, hedging strategy involves judgment calls:

Question 1: How much to hedge?

• Conservative approach: 90%+ hedge (very stable earnings)


• Aggressive approach: 30-50% hedge (capture upside from rate changes)


• Most banks: 60-75% hedge (balance stability and upside)

Question 2: What curve shape to assume?

• If you believe curve will steepen, may hedge less (benefit from steepening)


• If you believe curve will flatten, may hedge more at front end


• This introduces a "view" into the hedge

Question 3: How long to maintain the hedge?

• If mortgage originations are expected to spike, maybe hedge less today, more after originations


• If rate environment is expected to stabilize, may reduce hedge


• Dynamic decisions based on outlook

These judgment calls require experience and analysis. The best ALM managers combine technical rigor with strategic thinking about rates and balance sheet evolution.