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Bond Strategies

Strategy Selection Framework

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Strategy Selection Framework

Selecting a bond strategy is not about finding the highest yield or most sophisticated technique; it is about matching bonds to liabilities, aligning duration with time horizons, and disciplining the portfolio to reflect your risk tolerance.

Key takeaways​

  • The primary purpose of bonds is liability matching: aligning asset cash flows with known future obligations (college tuition, retirement, mortgage payoff).
  • Risk tolerance is the secondary filter: given a liability, the strategy must be volatile enough to be bearable (no panic-selling during drawdowns) but not more volatile than necessary.
  • Time horizon determines duration: a 10-year liability should be matched with 10-year duration assets; longer durations introduce rate risk; shorter durations introduce reinvestment risk.
  • The strategy selection framework proceeds in order: liabilities first, risk tolerance second, then choose the specific instrument (ladder, barbell, index fund, etc.).
  • Common pitfalls: choosing bonds for yield without considering liabilities, using floating-rate bonds to hedge inflation (they don't), and concentrating in illiquid securities.

Step 1: Define liabilities​

A liability is a known future obligation: tuition, retirement spending, mortgage principal, or other commitment. The framework begins by listing liabilities with amounts and dates.

Example 1: A 45-year-old with a planned retirement at 65 has a 20-year liability horizon. If annual retirement spending is estimated at 50k (in today's dollars), the nominal liability at age 65 will be approximately 65k–75k per year (accounting for 2% inflation). The total nominal liability over 30 years of retirement is roughly 2.5m–3m. To avoid sequence-of-returns risk and sequence-of-spending risk, the retiree might hold 5–10 years of spending (250k–500k) in bonds, with the remainder in equities that are expected to grow and fund later years.

Example 2: A 35-year-old with a daughter born in 2020 needs to fund 4 years of college starting in 2038 (18 years from now). The cost is estimated at 120k per year in today's dollars, or roughly 180k–200k per year in nominal dollars at 2038 (2% inflation). Total liability: 720k–800k. The investor should hold this liability in bonds matched to the college expense timeline: 25% in 15-year bonds (maturing in 2039), 25% in 16-year bonds (2040), 25% in 17-year bonds (2041), 25% in 18-year bonds (2042). This ladder ensures bonds mature just as tuition is due, eliminating rate risk on that portion.

Example 3: A high-income household holds a 5m investment portfolio. They don't have specific liabilities yet (financially secure with stable job). Their bonds serve a different purpose: volatility dampening and rebalancing benefit. They might hold 20–30% bonds to keep overall volatility at 10%, with no special attention to maturity or duration. A core-plus passive strategy (AGG + TLT) is appropriate.

These three cases require very different bond strategies, illustrating why "one-size-fits-all" bond allocation is a mistake.

Step 2: Assess risk tolerance​

Risk tolerance is the ability to sustain losses without panic-selling. It depends on:

1. Time horizon. A 10-year liability can tolerate a temporary 10% loss in bonds because there is time to recover (bonds paying coupons will accrue to par value). A 1-year liability cannot tolerate a 10% loss; if bonds fall 10%, the liability is underfunded.

2. Alternate funding. If an investor has a large salary, they can fund liabilities from ongoing income, reducing the need for bonds. If an investor is retired and fully dependent on portfolio returns, bonds must be more conservative.

3. Emotional capacity. Some investors panic and sell when portfolios drop 20%; others are unfazed. Assessing own behavior honestly is crucial. If you are prone to panic, hold shorter-duration bonds to reduce volatility, even if slightly lower yields result.

4. Regulatory or fiduciary requirements. A pension fund with a funding ratio of 100% might take on higher duration risk (longer bonds) to boost returns and improve funding. A pension fund at 80% funding might reduce duration risk and be more conservative.

A framework for risk tolerance:

  • Conservative: Duration 2–4 years (short bonds, floating-rate bonds). Target volatility 2–3%. Suitable for liabilities within 3–5 years and low emotional tolerance for losses.
  • Moderate: Duration 5–7 years (core bonds like AGG). Target volatility 5–6%. Suitable for liabilities 10–15 years away or investors with stable income.
  • Aggressive: Duration 8–12 years (extended index, barbell, ladders). Target volatility 7–10%. Suitable for liabilities 20+ years away or investors who can tolerate draw-downs.

Step 3: Match duration to liability horizon​

Once liabilities are defined and risk tolerance assessed, match duration to the liability timeline.

Liability in 3 years → Duration 2–3 years. A 3-year liability should not be exposed to 7-year duration bonds because a rate move affects the bond's value, introducing return uncertainty. Instead, use SHV (1–3 year bonds, duration ~1.8) or a short ladder.

Liability in 10 years → Duration 8–10 years. An intermediate liability should be matched with intermediate-duration bonds. AGG (duration 5.5 years) is too short; TLT (duration 18 years) is too long. Consider IEF (iShares 7–10 Year Treasury, duration ~7) or a custom ladder matching the liability timeline.

Liability in 25 years (e.g., college for a newborn) → Duration 20–25 years. This long liability can tolerate long-duration bonds. A barbell (50% short, 50% long-term) or a 25-year ladder ensures assets are timed to liabilities.

No specific liabilities (pure savings/wealth building) → Duration per risk tolerance. Without a liability anchor, duration is chosen for return/risk tradeoff. A moderate investor might use 5–7 year duration (AGG); an aggressive investor might use 8–12 years (AGG + TLT).

Step 4: Select the instrument​

Once duration and size are determined, select the specific instrument:

For small amounts (under 100k) and simple liabilities (5–10 years away): Use an index ETF (AGG for broad exposure, or BND for tax efficiency). Rebalance annually.

For moderate amounts (100k–500k) and simple liabilities: Use a core-plus strategy (AGG 70%, TLT 30% for extended duration, or AGG 70%, SHV 30% for shorter). Rebalance annually, harvest losses.

For large amounts (500k+) and specific liabilities: Use a custom bond ladder, matching each bond maturity to a liability date. This eliminates reinvestment risk and rate risk on that portion. Ladders incur trading costs but provide predictability.

For leveraged or specialized strategies (credit spread trading, arbitrage): Use only if you have expertise, access to low-cost funding (repo), and sufficient capital to justify infrastructure. These are institutional tools; retail investors should avoid.

For international bonds: Use sparingly (5–10% of bond allocation) for yield pickup and diversification, unless you have strong FX views. Currency hedging is expensive; unhedged positions are volatile.

Step 5: Implement, monitor, and rebalance​

Once a strategy is chosen, implement it systematically:

  1. Execute the full allocation at once or via a dollar-cost-averaging plan. If deploying 100k, either invest all immediately (if confident in the strategy) or invest 20k per month over 5 months to reduce timing risk.

  2. Rebalance annually. In December, check if bonds have drifted >3% from target. If so, rebalance to restore. Tax-loss harvest any underwater positions.

  3. Monitor for liability changes. If a liability timeline shifts or new liabilities emerge, adjust the bond strategy. A college that was 18 years away is now 17 years away; consider rotating the ladder forward.

  4. Resist yield-chasing. If high-yield bonds suddenly offer 8% (attractive) and investment-grade bonds offer 4%, stay the course. Higher yield reflects higher risk; if your risk tolerance is moderate, the strategy should remain moderate.

  5. Rebalance during extremes. If rates rise sharply and bonds fall 15%, rebalancing forces buying (via annual adjustments). This captures the volatility-tax benefit. Do not skip rebalancing during drawdowns.

Case study: 50-year-old accumulator with mixed liabilities​

Consider a 50-year-old professional with 1m in investable assets, one child in college (liability ends in 3 years), a home mortgage (15 years remaining, balance 200k), and a planned retirement at 65 (15 years away).

Liabilities:

  • 60k per year for 3 years (college): 180k total. Duration target: 2–3 years.
  • 200k mortgage principal repayment at various dates (amortizing). Average duration: 7 years.
  • 50k annual retirement spending for 25 years starting at 65. Nominal: ~1.3m total. Duration target: 15+ years.

Total liability: ~1.66m nominal, weighted average duration ~10 years.

Strategy:

  • 180k (18% of bond allocation) in SHV (1–3 year Treasury) to cover college.
  • 200k (20% of bond allocation) in a 7-year ladder to match mortgage payoff.
  • 620k (62% of bond allocation) in AGG or a barbell (50% AGG, 50% TLT) to fund retirement.

Blended bond allocation:

  • SHV: 18% × 1.8 years = 0.32 years.
  • 7-year ladder: 20% × 7 years = 1.4 years.
  • AGG: 62% × 5.5 years = 3.41 years.
  • Blended duration: 5.13 years (moderate, aligned with 10-year average liability).

Annual rebalancing adjusts SHV holdings as college tuition is paid (reducing the SHV allocation), shifting proceeds to longer-duration bonds. By the end of year 3, the SHV tranche is depleted, and the portfolio is 30% ladder (mortgage), 70% AGG/barbell (retirement).

This strategy is transparent, matches liabilities, and requires minimal active management.

Common pitfalls and how to avoid them​

1. Chasing yield without regard to duration. Buying a 20-year bond for a 5-year liability because it yields 0.5% more is a mistake. The rate risk is not worth the extra yield.

2. Over-concentrating in illiquid securities. Individual bonds are illiquid; if a sudden need for cash arises, selling at unfavorable prices is costly. Index funds are more liquid.

3. Using floating-rate bonds to hedge inflation. Floating-rate bonds hedge interest-rate risk, not inflation. If inflation spikes to 6% and central banks do not raise rates, floating-rate bonds underperform fixed-rate bonds. Use inflation-protected Treasuries (TIPS) or equities to hedge inflation.

4. Ignoring rebalancing. A bond ladder set up at age 35 for retirement at 65 can drift if not rebalanced. New contributions or changes in liability timelines require adjustments.

5. Misjudging risk tolerance. If you overestimate your ability to tolerate losses and hold 20-year duration bonds, a 20% drawdown (from rising rates) may trigger panic-selling, locking in losses. Better to choose a strategy with volatility you can genuinely live with.

Next​

This final article of the bond-strategies chapter brings together all the preceding insights: credit spreads, roll yield, leverage, and passive indexing all serve the overarching goal of matching bonds to liabilities and goals. A bond strategy without a liability anchor or clear purpose is speculation. With a framework, bonds become a powerful tool for reducing portfolio volatility and meeting specific goals.

The conclusion of this chapter: bonds are not a yield-seeking afterthought. They are a core building block, requiring as much intentionality and discipline as equity selection or asset allocation.