Target-Date Funds Explained: Set-and-Forget Retirement Investing
How target-date funds shift from stocks to bonds automatically, what glide paths mean, and how to tell a good one from an expensive one.
A target-date fund is a single diversified fund that automatically becomes more conservative as your retirement year approaches, so one holding can serve as an entire portfolio.
What you'll walk away with
Skim these first — then dig into the details below.
- 1Pick the fund whose year is closest to when you expect to retire, such as 2055.
- 2The fund shifts from stocks toward bonds automatically along a published glide path.
- 3Expense ratios range from about 0.08% to 0.75% — index-based versions are the cheap ones.
- 4Holding a target-date fund alongside other funds usually undoes its purpose.
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Target-date funds solved the biggest practical problem in 401(k) investing: most people were never going to build and maintain their own allocation. One fund handles diversification, rebalancing, and the shift toward safety over time.
They are now the default investment in most workplace plans, which means millions of people own one without ever deciding to. It is worth knowing what you actually hold.
How glide paths work
The glide path is the schedule that governs how the stock-to-bond mix changes as the target year approaches. Every fund family publishes its own, and they differ more than people expect.
- Decades from retirement, allocations typically sit around 85–90% stocks.
- Roughly ten years out, the mix commonly shifts to 60–70% stocks.
- At the target date, many funds hold about 50% stocks, since retirement can last 30 years.
- "To retirement" funds stop adjusting at the target year; "through retirement" funds keep shifting for years afterward.
- Two funds with the same target year can hold noticeably different stock percentages.
What to check before you buy
Target-date funds vary widely in cost, and fees compound against you over a 30-year holding period. A few minutes of review can be worth tens of thousands of dollars.
- 1
Look up the expense ratio; aim for under 0.20%, which index-based series generally achieve.
- 2
Confirm the underlying holdings are index funds rather than higher-cost active funds.
- 3
Read the glide path chart in the fund summary and check the stock allocation at your age.
- 4
Determine whether it is a "to" or "through" retirement fund.
- 5
Check the international allocation — most reasonable funds hold 30–40% of stocks outside the US.
Common mistakes
Most target-date fund errors come from treating it like one holding among many. It is designed to be the whole portfolio.
- Combining a target-date fund with several individual funds, which scrambles the intended allocation.
- Owning multiple target-date funds with different years for no particular reason.
- Holding one in a taxable brokerage account, where the bond income and internal turnover are tax-inefficient.
- Assuming the target year is a guarantee rather than an allocation schedule — these funds can and do lose value.
- Ignoring the fund because it is the plan default, without ever checking its cost.
When to build your own portfolio instead
Doing it yourself can lower costs and add flexibility, but only if you will actually maintain it. An unmaintained DIY portfolio is worse than an automated one.
- Your plan’s target-date options are expensive but it offers cheap index funds.
- You want to place bonds in tax-deferred accounts and stocks in Roth or taxable accounts.
- Your desired allocation differs meaningfully from every available glide path.
- If none of these apply, the target-date fund is very likely the better outcome.
Disclaimer: This page includes AI-assisted educational content reviewed for general accuracy. It is not personalized financial, tax, or legal advice. Verify numbers with a qualified professional and our editorial standards.
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