Target-Date Funds Explained: Glide Paths, Costs, and What "To" vs. "Through" Means
Target-date funds automatically shift from stocks to bonds as a target year approaches. Here is how glide paths work, why two funds with the same year can hold very different mixes, and what to check before relying on one.
A target-date fund is a single fund that holds a diversified mix of stocks and bonds and gradually becomes more conservative as a target year approaches, usually your expected retirement year. It's the default investment in many workplace retirement plans because it handles allocation and rebalancing automatically.
How the glide path works
The schedule for shifting from stocks to bonds is called the glide path. A hypothetical glide path:
| Years until target date | Stocks | Bonds and cash |
|---|---|---|
| 40 | 90% | 10% |
| 30 | 88% | 12% |
| 20 | 80% | 20% |
| 10 | 65% | 35% |
| 0 (target year) | 50% | 50% |
| 10 years after | 35% | 65% |
Show the numbers behind this chart
| Years until target date (negative = after) | Stocks | Bonds and cash |
|---|---|---|
| 40 | 90% | 10% |
| 30 | 88% | 12% |
| 20 | 80% | 20% |
| 10 | 65% | 35% |
| 0 | 50% | 50% |
| −10 | 35% | 65% |
"To" vs. "through"
- "To" glide paths reach their most conservative mix at the target date and then stay there.
- "Through" glide paths keep becoming more conservative for years after the target date.
Two funds with the same target year can hold very different amounts of stock at retirement, depending on the fund family's approach. Look at the actual allocation, not just the year in the name.
Strengths
- Automatic diversification across many holdings.
- Automatic rebalancing and allocation changes; see asset allocation and rebalancing.
- Simplicity: one fund, one decision.
- Behavioral benefit: less temptation to tinker.
Things to check
- Expense ratio. Target-date funds built from index funds often cost less than those using actively managed funds. Costs compound; see what a 1% fee really costs.
- Equity exposure near retirement. Is it more or less than you'd want? See sequence-of-returns risk.
- Underlying holdings. What kinds of stocks and bonds, and how much international exposure?
- Your other investments. Holding a target-date fund alongside other funds can unintentionally change your overall allocation. They're designed to be used alone.
- Your actual timeline and risk tolerance. The target year is just a label; you can pick a different year to be more or less aggressive. See risk tolerance vs. risk capacity.
The takeaway
Target-date funds offer a diversified, self-adjusting portfolio in one fund. Before relying on one, look past the year in the name to its actual allocation, glide path, and costs, and use it as your main holding rather than one piece of a mix.
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