Managing Duration Exposure

Managing Duration Exposure

Structures portfolio duration management with hedging strategies and benchmark tracking for fixed-income portfolios.

When To Use

• Rebalancing portfolio duration toward a target or benchmark (e.g., Bloomberg US Aggregate)
• Assessing interest rate risk after yield curve shifts or central bank policy changes
• Constructing or evaluating duration hedges using swaps, futures, or options
• Reviewing duration drift from cash flows, maturities, prepayments, or new allocations
• Preparing duration exposure reports for investment committees or risk oversight

Inputs To Gather

• Portfolio holdings — CUSIP/ISIN-level positions with par amounts, market values, and coupon details
• Duration metrics — Effective duration, modified duration, key rate durations (KRDs) per holding and at portfolio level
• Benchmark profile — Target index or custom benchmark with duration, KRD breakdown, and sector composition
• Yield curve data — Current Treasury/swap curves, recent curve shifts, and forward rate expectations
• Hedge instruments available — Treasury futures contracts (2Y, 5Y, 10Y, Ultra), interest rate swaps, swaptions, caps/floors
• Risk limits — Mandated duration band (e.g., benchmark +/- 0.5 years), maximum DV01, tracking error tolerance
• Scenario parameters — Parallel shift sizes (e.g., +/-50bp, +/-100bp), curve twist/butterfly scenarios

Workflow

1. Measure Current Exposure

   • Calculate portfolio effective duration, spread duration, and DV01
   • Decompose into key rate duration buckets (2Y, 5Y, 10Y, 30Y at minimum)
   • Compute duration contribution by sector (government, corporate, securitized, municipal)
   • Identify convexity profile — negative convexity from MBS/callables requires separate treatment

2. Compare Against Benchmark/Target

   • Map portfolio KRDs to benchmark KRDs at each tenor point
   • Calculate duration gap (portfolio duration minus benchmark duration)
   • Identify the largest KRD mismatches — these drive tracking error
   • Flag any duration drift from recent cash flows, paydowns, or new trades

3. Design Hedging/Adjustment Strategy

   • For parallel duration gap: size Treasury futures or swap overlays to close the gap
     • Futures hedge ratio = Target DV01 change / DV01 per contract [VERIFY contract specs for current delivery cycle]
     • Swap overlay: receive/pay fixed to lengthen/shorten duration
   • For curve positioning: use barbell/bullet trades or KRD-targeted futures to adjust specific tenor buckets
   • For convexity management: evaluate swaptions or Treasury options to offset MBS negative convexity
   • Estimate hedge cost: carry, roll, margin requirements, and bid-ask slippage

4. Run Scenario Analysis

   • Parallel shifts: +/-25bp, +/-50bp, +/-100bp — compute P&L impact on hedged vs. unhedged portfolio
   • Curve scenarios: bull steepener, bear flattener, twist — assess KRD mismatch impact
   • Spread scenarios: widening/tightening by sector to isolate spread duration risk from rate duration
   • Stress test: replay historical episodes (2013 taper tantrum, 2022 rate hiking cycle) against current positioning

5. Document and Report

   • Summarize current vs. target duration, KRD profile, and hedge positions
   • Present scenario P&L table with breakeven rate levels
   • List open hedge positions with notional, DV01 contribution, maturity/expiry, and roll dates
   • Note any residual risks: basis risk between hedges and portfolio, cross-currency duration if applicable
   • Flag upcoming events that could shift duration profile (Fed meetings, large maturities, MBS prepayment resets)

Output

• Duration Exposure Summary — One-page table: portfolio duration, benchmark duration, gap, DV01, and KRD breakdown by tenor
• Hedge Recommendation — Instrument, direction, notional/contracts, expected DV01 impact, cost estimate
• Scenario Analysis Matrix — Grid of rate scenarios vs. portfolio P&L (total return and price return)
• Risk Dashboard — Tracking error estimate, duration band compliance status, largest KRD mismatches
• Action Items — Specific trades to execute, rebalancing triggers, next review date

Quality Checks

• Duration and DV01 figures reconcile between portfolio analytics system and independent calculation
• Hedge sizing accounts for futures conversion factor and cheapest-to-deliver basis [VERIFY CTD bond for active contract]
• KRD buckets sum to approximately the total effective duration (within rounding tolerance)
• Scenario analysis includes both rate and spread duration effects — not rate-only
• MBS and callable bond durations use OAS-based effective duration, not modified duration
• Benchmark data is current — stale index rebalancing dates can distort duration comparisons [VERIFY index rebalance date]
• Hedge roll dates are flagged before expiry to avoid unintended duration gaps
• All duration figures specify the methodology (effective, modified, Macaulay) to prevent misinterpretation