When should a retiree choose a life annuity over a systematic withdrawal plan, and what are the key trade-offs?

The annuity vs. systematic withdrawal decision is one of the most consequential choices in retirement income planning. Each approach manages longevity risk differently, and the optimal choice depends on the client's specific circumstances.

Systematic Withdrawal Plan (SWP): The retiree maintains portfolio ownership and withdraws a fixed dollar amount or percentage each period. Popular rules include the "4% rule" (withdraw 4% of initial portfolio, adjusted for inflation).

Life Annuity: The retiree transfers capital to an insurance company in exchange for guaranteed lifetime income. The insurer pools mortality risk across many policyholders.

Mortality Credits -- The Annuity Advantage:

Mortality pooling is the key concept. When an annuitant dies earlier than expected, their remaining capital subsidizes payments to those who live longer. This "mortality credit" allows annuities to pay a higher income than a self-managed portfolio at any given probability of success.

Numerical Comparison:

Retiree Theodora, age 65, has $1,000,000.\n\nOption A: Systematic withdrawal at 4.5$45,000/year

• Monte Carlo probability of sustaining 30 years: 78%
• If she lives to 95, there's a 22% chance of ruin
• If she dies at 75, estate receives remaining portfolio (~$850,000)\n\nOption B: Life annuity purchased at age 65\n- Annuity payout rate: 6.2$62,000/year (guaranteed for life)
• Income is $17,000/year higher due to mortality credits\n- If she dies at 75, estate receives nothing (no refund feature)\n- If she lives to 100, payments continue regardless\n\n**Decision Framework:**\n\n| Factor | Favors Annuity | Favors SWP |\n|---|---|---|\n| Longevity risk | High (healthy, family history) | Low (health issues) |\n| Bequest motive | Weak | Strong |\n| Other guaranteed income | Low (no pension) | High (pension, SS) |\n| Risk tolerance | Low | High |\n| Flexibility needs | Low | High |\n| Market environment | Low rates (annuities still pay mortality credits) | High rates (SWP returns attractive) |\n| Inflation concern | High (fixed annuity loses purchasing power) | Moderate (SWP can adjust) |\n\n**Hybrid Approach:**\nMany advisors recommend annuitizing a portion of the portfolio to cover essential expenses (floor) and systematically withdrawing from the remainder for discretionary spending (upside). For Theodora:\n- Annuitize$500,000 -> $31,000/year (covers essentials)\n- SWP from$500,000 at 4% -> $20,000/year (discretionary + bequest)\n- Total income:$51,000/year with partial security and flexibility

Explore retirement strategies in our CFA Level III Portfolio Management resources.