How is a target-date fund glidepath designed?

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AcadiFi · Accepted Answer

A target-date fund glidepath is a schedule of equity/fixed-income allocation versus years-to-retirement, designed to balance accumulation growth with preservation of capital near retirement. Two philosophies: 'to-retirement' glidepaths reach their lowest equity at retirement (typically 30-40%), 'through-retirement' continue decreasing for 10-20 years post-retirement, ending at 20-30% equity, reflecting longer life expectancy and lower early-retirement drawdown risk. Design inputs include expected returns, asset vol, and investor-specific assumptions about savings rate, starting balance, longevity, and preferences over shortfall risk versus income. Stochastic Monte Carlo simulates 10,000+ paths under various glidepath shapes, measuring metrics like 5th-percentile terminal wealth, probability of running out before age 92, expected replacement rate. Optimize the glidepath to maximize utility subject to retirement income floors. Typical glidepath: 95/5 at age 25, 85/15 at age 45, 60/40 at age 60, 40/60 at retirement age 65, gliding to 30/70 by age 80. Some include alternatives (5-10% REITs, commodities) and TIPS at later ages to handle inflation. Rebalancing frequency (monthly or quarterly), asset sub-allocation (international, small-cap), and fund-of-fund fees affect net outcomes. ```mermaid graph LR A[Age 25
95% eq] --> B[Age 45
85%] B --> C[Age 60
60%] C --> D[Retire
40%] D --> E[Age 80
30%] ```

How is a target-date fund glidepath designed?

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