What are the key design decisions for a target-date fund?

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AcadiFi · Accepted Answer

Target-date fund design involves seven interconnected decisions beyond the headline equity glidepath:

(1) Asset class palette: traditional TDFs use US/international equity and investment-grade bonds. Advanced TDFs add TIPS, real estate, commodities, high yield, EM debt, and liquid alternatives. More asset classes improve diversification but raise costs and complexity.

(2) Active vs passive: Vanguard TDFs are pure index (expense ratio 8-12 bps); T. Rowe Price TDFs use active management (50-70 bps). Meta-analysis shows TDF alpha is thin net of fees, tilting most sponsors toward passive.

(3) Through vs to retirement: through-retirement glidepaths continue de-risking until age 80-85 to protect against sequence-of-return risk; to-retirement fixes allocation at age 65. Fidelity Freedom 2030 is through; BlackRock LifePath is to.

(4) Tactical overlay: some TDFs include 5-15% tactical allocation bands allowing modest deviations from strategic weights based on valuation signals. Morningstar's analysis shows this rarely adds alpha net of fees.

(5) Inflation hedging: real assets allocation (TIPS, REITs, commodities, infrastructure) typically 8-15% at young ages rising to 20-25% in retirement when real return uncertainty matters most.

(6) Fee structure: institutional share classes (5-15 bps) for DC plans; retail shares (60-80 bps) for IRA rollovers. Fiduciary duty (ERISA 404(c)) requires cost justification.

(7) Benchmark construction: blended benchmark using underlying asset class indices weighted by policy weights.

For Solomon Wealth Advisors managing a $2.8B DC plan, a custom TDF might blend Vanguard Total Stock (30%), Vanguard Total International (20%), Vanguard Total Bond (35%), Vanguard Short-Term TIPS (10%), Vanguard REIT (5%) at age 45, gradually shifting to 40% equity / 50% bonds / 10% real at age 65.

What are the key design decisions for a target-date fund?

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