Your 401(k) enrollment packet had a default option. Unless you changed it, your contributions are going into the Target Date 2055 fund or whatever year closest matches your expected retirement. About 60% of 401(k) participants stay in the default target-date fund for their entire career. It's the convenient answer. It's also costing the average participant 0.4-0.6% per year in unnecessary fees and another 0.2-0.5% in suboptimal allocation.
Over 30 years, that's a meaningful haircut — roughly 15-25% of the final portfolio value. Whether that tradeoff is worth the set-it-and-forget-it convenience depends on how much time you're willing to spend on your retirement, and how much the extra cost bothers you.
What Target-Date Funds Actually Are
A target-date fund is a fund-of-funds. The 2055 fund holds multiple underlying funds (US stocks, international stocks, bonds, sometimes REITs or TIPS) in a specific allocation that shifts over time. As you approach 2055, the fund automatically rebalances to more bonds and fewer stocks.
The allocation path — called the "glide path" — varies by provider:
- Vanguard TDF 2055: currently 88% stocks, 12% bonds for a 2055 retiree
- Fidelity Freedom 2055: 90% stocks, 10% bonds
- T. Rowe Price 2055: 93% stocks, 7% bonds
- American Funds 2055: 85% stocks, 15% bonds
At retirement age, most TDFs land around 40-50% stocks, 50-60% bonds. The glide path continues post-retirement in most modern funds ("through" retirement) rather than ending at retirement date ("to" retirement).
The Fee Problem
Target-date funds charge fees on top of the underlying funds they hold. Some examples:
- Vanguard Target Retirement 2055 (VFFVX): 0.08% expense ratio
- Fidelity Freedom 2055 (FDEEX): 0.75% expense ratio
- T. Rowe Price Retirement 2055 (TRRNX): 0.65% expense ratio
- American Funds 2055 (CLKTX): 0.66% (Class A, plus 5.75% front load)
The Vanguard fund is cheap because it uses index funds underneath. The others use actively managed funds underneath, which justifies (from the fund company's perspective) a 0.65-0.75% expense ratio.
The "build your own" version — same allocation implemented with VTI/VXUS/BND directly — costs about 0.05%. Over 30 years, 0.7% vs. 0.05% compounds to a 20%+ difference in ending portfolio value on an otherwise identical allocation.
The Allocation Problem
Even the cheap Vanguard TDF 2055 has an allocation worth questioning:
- US stocks: 54%
- International stocks: 34%
- US bonds: 6%
- International bonds: 6%
The 40% international allocation is higher than most sophisticated investors would choose. International has underperformed US stocks by roughly 5% annually for 14 years. If the target-date fund holds 40% international, you've paid a meaningful performance cost.
The 12% bonds for someone 30 years from retirement is also aggressive bonds for the age. Someone young enough to be saving for 2055 can usually tolerate more stock volatility than the fund assumes.
The "To vs. Through" Distinction
Target-date funds differ in what happens at retirement:
- "To" retirement: reaches final allocation (e.g., 30% stocks, 70% bonds) at target date and stays there
- "Through" retirement: continues glide path for 10-20 years after target date, ending at maybe 20-25% stocks
Most modern TDFs are "through" funds. The industry has concluded that retirees need more stocks for longer lifespans. But the specific glide path choice matters — someone retiring at 65 with a 2055 "through" fund may find themselves with 50% stocks at 65, 35% at 75, 25% at 85. That's a real asset allocation plan, whether or not you'd have chosen those numbers.
When Target-Date Funds Win
For specific scenarios, the simplicity justifies the cost:
- You won't check your 401(k) more than once a year and won't rebalance on your own
- You don't have a clear asset allocation thesis and want a default that rebalances
- Your plan has only expensive fund options, and the TDF isn't substantially more expensive than the individual funds
- You're worried about your own behavior — a TDF prevents you from chasing performance or panic-selling
For many employees, #4 is the real benefit. A cheap TDF that keeps you invested through 2008/2022-style drawdowns is worth 0.5% per year in fees if it prevents you from selling at the bottom.
The DIY Alternative
If your plan has low-cost index options (common at larger employers), building your own is straightforward:
- 60-80% in US Total Market (S&P 500 often only option)
- 10-20% in International
- 5-20% in Bonds (age-dependent)
Rebalance once a year. This takes 10 minutes and saves 0.5-0.7% annually vs. a typical active TDF.
You need discipline to rebalance — if you won't do it, the TDF's auto-rebalancing feature has real value.
The Fund-of-Funds Wrapper Cost
Target-date funds at Fidelity, T. Rowe Price, and American Funds charge their expense ratio on top of the underlying fund fees. The underlying funds inside Fidelity Freedom 2055 charge roughly 0.55% collectively; the wrapper adds 0.20% to reach 0.75%. You're paying a markup to have someone rebalance for you.
Vanguard's TDFs use their own index funds internally and only charge 0.08% total — effectively subsidizing the rebalancing service. This is why Vanguard's TDF is the best in the industry for retail investors.
The Real Recommendation
If your 401(k) offers a Vanguard TDF: it's probably fine. 0.08% is cheap enough that the convenience factor wins.
If your 401(k) offers Fidelity Freedom or T. Rowe Price TDFs (not the index versions): the cost is high enough to justify DIY. Look at the underlying index fund options and build your own allocation. Spend 20 minutes once; save $25,000+ over 30 years.
Fidelity Freedom Index 2055 (FDEWX, note the different ticker) is the index version at 0.12%. Check which version your plan offers. If it's the index version, it's competitive with Vanguard. If it's the active version, DIY is almost certainly better.
The Pre-Retirement Question
Within 5-10 years of retirement, you may want to override the TDF's allocation. If you've saved aggressively and don't actually need the standard glide path, holding 40% bonds at 60 might be more conservative than your situation warrants.
Some 50-year-olds have enough saved that they're essentially in "second generation" wealth mode — investing for heirs, not their own retirement. For them, the TDF's conservative post-retirement allocation is wrong. More stocks makes more sense.
The Simple Answer
Check your TDF's expense ratio today. If it's below 0.15%, it's fine. Leave it. If it's above 0.50%, build your own portfolio from the index fund options in your plan. If your plan doesn't have decent index funds, contribute up to the match and direct additional savings to your IRA/taxable where you have better options.
The TDF is a default for a reason — it's better than no investing. But for anyone willing to spend 20 minutes on their 401(k) once per year, DIY allocation is meaningfully better.