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A target-date fund is the simplest way to invest for retirement: pick one fund matching your retirement year, and it handles everything else. Here is how it works and who should use one.
In our 401(k) guide, we said that beginners should put 100% of their 401(k) contributions into a target-date fund. In our Roth IRA guide, we mentioned it as the simplest possible investment option. Multiple posts, same recommendation.
Here is what a target-date fund actually is, how it works under the hood, and why it is simultaneously the most recommended and most criticized investment product for retirement savers.
The one-sentence explanation
A target-date fund is a single fund that holds a mix of stocks and bonds and automatically shifts from aggressive (more stocks) to conservative (more bonds) as you approach your target retirement year.
You pick a year. The fund does everything else.
How it works in practice
You are 27 years old and plan to retire around 2060. You buy the Vanguard Target Retirement 2060 Fund (VTTSX) or its ETF equivalent. Here is what is inside today (35 years from retirement):
- 54% US stocks (Vanguard Total Stock Market Index)
- 36% International stocks (Vanguard Total International Stock Index)
- 7% US bonds (Vanguard Total Bond Market Index)
- 3% International bonds (Vanguard Total International Bond Index)
That is roughly 90% stocks and 10% bonds. Aggressive, because you have decades for your portfolio to recover from any crash.
In 2045 (15 years from retirement): automatically shifted to roughly 75% stocks and 25% bonds.
In 2055 (5 years from retirement): roughly 55% stocks and 45% bonds.
In 2060 (at retirement): roughly 50% stocks and 50% bonds.
After 2060: the fund continues shifting. About 7 years after the target date, it reaches its most conservative allocation (roughly 30% stocks, 70% bonds) and stays there.
This gradual shift from stocks to bonds is called a glide path. Every target-date fund family has its own. Some are more aggressive (Vanguard and T. Rowe Price hold more stocks throughout). Some are more conservative (Fidelity and JP Morgan shift to bonds earlier). The differences matter but are less important than the basic concept: the fund automatically becomes more conservative as you age, without you doing anything.
Why target-date funds exist
Before target-date funds became popular (they were introduced in the 1990s but really took off after the Pension Protection Act of 2006, which made them the default investment in many 401(k) plans), most 401(k) participants had to build their own portfolios from a menu of 15 to 30 funds. The result was predictable: many people picked funds randomly, held inappropriate allocations, or left their money in the default money market fund earning almost nothing.
Target-date funds solve this by giving investors a single, age-appropriate, globally diversified, automatically rebalancing fund. Pick one, contribute to it, and ignore it for 30 years. The fund manager handles the asset allocation, rebalancing, and glide path.
It is investing on autopilot, and for most people, autopilot produces better results than trying to fly the plane themselves.
What is inside a target-date fund?
Most target-date funds from major providers are “funds of funds.” They hold a handful of underlying index funds:
Vanguard Target Retirement Funds: Hold 4 Vanguard index funds (Total US Stock Market, Total International Stock, Total US Bond, Total International Bond). Expense ratio: 0.08%. All passive index.
Fidelity Freedom Index Funds: Hold Fidelity index funds tracking similar benchmarks. Expense ratio: 0.12%. All passive index. (Fidelity also offers actively managed Freedom Funds at 0.50 to 0.75%, which we do not recommend.)
T. Rowe Price Retirement Funds: Hold a mix of T. Rowe Price actively managed funds. Expense ratio: 0.50 to 0.65%.
Schwab Target Index Funds: Hold Schwab index funds. Expense ratio: 0.08%.
The Vanguard and Schwab options at 0.08% are the cheapest and hold pure index funds underneath. For most people, these are the best choice.
Target-date fund vs. building your own portfolio
In our index fund guide, we recommended a 3-fund portfolio: 60% VTI, 30% VXUS, 10% BND. How does that compare to a target-date fund?
What is the same: both approaches own the same underlying asset classes: US stocks, international stocks, and bonds. A Vanguard Target Retirement 2060 fund holds the same Vanguard index funds you would buy individually.
What the target-date fund does automatically:
Rebalancing. When stocks surge and bonds lag, your 60/30/10 split drifts to 65/32/3. You need to sell some stocks and buy bonds to get back to target. With a target-date fund, this happens automatically.
Glide path adjustment. As you age, you should gradually reduce stock exposure. With a DIY portfolio, you need to manually shift from 90/10 at age 25 to 60/40 at age 55. With a target-date fund, it happens automatically.
Behavioral protection. During a crash, a DIY investor has to actively decide not to sell. The target-date fund removes that decision point.
What you give up:
Customization. You cannot tweak the allocation within the fund.
Tax optimization. In a taxable account, you might want to hold bonds in tax-advantaged accounts and stocks in taxable for tax efficiency (called “asset location”). A target-date fund holds everything together. This only matters in taxable accounts, not in your 401(k) or Roth IRA.
Slightly lower fees. Vanguard’s target-date fund charges 0.08%. Holding VTI (0.03%), VXUS (0.07%), and BND (0.03%) directly costs roughly 0.04% blended. The difference on $100,000 is $40/year. Negligible.
When a target-date fund is the right choice
You are a beginner. If you just opened your first 401(k) or Roth IRA and the idea of choosing between 20 funds paralyzes you, a target-date fund removes the paralysis. One fund, done.
Your 401(k) has limited options. Many 401(k) plans have mediocre fund menus with high-fee actively managed funds. The target-date fund in these plans is often the best option because it is diversified and has a reasonable fee.
You will not rebalance. Be honest with yourself. If you are not going to log in every year and adjust your allocation, a target-date fund does it for you. An automatically maintained portfolio beats a neglected DIY portfolio every time.
You want simplicity above all. Some people have no interest in investment management. They want to save for retirement and never think about it again. A target-date fund is built for exactly this person.
When to build your own portfolio instead
You want more control over allocation. If you have strong views on US vs. international weighting or want tilts toward REITs or small-cap value, a target-date fund’s one-size-fits-all approach will frustrate you.
You invest across multiple account types. If you have a 401(k), Roth IRA, and taxable brokerage, you might want to optimize asset location. This requires managing each account separately, which a target-date fund does not allow.
Your target-date fund options are expensive. If the only target-date fund in your 401(k) charges 0.60%+ and your plan also offers an S&P 500 index fund at 0.03%, building a simple 2 to 3 fund portfolio is cheaper. The fee savings compound significantly over decades.
You enjoy managing your investments. If picking funds and rebalancing is a hobby rather than a chore, a 3-fund portfolio is an excellent approach for engaged investors.
Common target-date fund mistakes
Picking the wrong year. The year in the fund name should match when you plan to retire, not the current year. If you are 27 and plan to retire at 65, choose a 2060 or 2065 fund, not a 2026 fund. A 2026 fund is already very conservative (nearly 50% bonds) because it is designed for someone retiring this year.
Holding a target-date fund AND other funds. Your target-date fund is already a complete portfolio. If you hold it plus a separate S&P 500 index fund, you are overweighting US large-cap stocks and defeating the target-date fund’s designed allocation. Either go 100% target-date or go fully DIY. Do not mix.
Assuming all target-date funds are the same. A Vanguard 2060 fund (0.08%, all index) and a plan-specific 2060 fund managed by an insurance company (0.75%, actively managed) are very different products. Always check the expense ratio and underlying holdings.
Panicking and selling during a crash. Even though the target-date fund manages your allocation automatically, it cannot prevent you from selling the entire fund during a downturn. The behavioral protection only works if you hold through the crash. The 2020 crash recovered fully within 5 months. Every crash before it also recovered.
