What are target-date funds and should you use them?

When people ask me what to invest in and I can tell they don't want to think about it ever again, I point them toward target-date funds. They're the default option in most 401(k) plans for a reason: pick a fund with a year near your planned retirement, and it does the rest. Automatically shifts from stocks to bonds as you age, rebalances quarterly, and requires exactly zero effort from you.

How they work

A 2060 target-date fund (for someone retiring around 2060) might start with:

• 2026 allocation: 90% stocks, 10% bonds
• 2040 allocation: 75% stocks, 25% bonds
• 2060 allocation: 40% stocks, 60% bonds (at retirement)
• 2070 allocation: 30% stocks, 70% bonds (10 years post-retirement)

This is called the "glide path" - the automatic shift from aggressive to conservative over time.

Pros

Simple: One fund is your entire portfolio.

Automatic rebalancing: The fund adjusts allocations quarterly without you doing anything.

Professionally managed: The glide path is designed by experienced portfolio managers.

Behavioral advantage: Prevents you from panicking and selling stocks during crashes (the fund does it gradually for you).

Cons

One-size-fits-all: The fund doesn't know if you have a pension, rental income, or plan to work part-time in retirement.

Inflexible: You can't adjust the glide path based on your risk tolerance or other assets.

Higher fees (sometimes): Target-date funds often have expense ratios of 0.10-0.50%, vs. 0.03-0.08% for underlying index funds.

Overconcentration risk: If you pick a Vanguard 2050 fund in your 401(k) and a Fidelity 2050 fund in your IRA, you might think you're diversified, but you're not - both hold similar assets.

Active vs. passive target-date funds

Passive (better): Vanguard, Fidelity, Schwab target-date INDEX funds

• Expense ratios: 0.08-0.15%
• Simply hold low-cost index funds

Active (worse): Traditional target-date funds with active management

• Expense ratios: 0.50-1.00%
• Try to beat the market (usually fail after fees)

Always choose the INDEX version if available.

When target-date funds make sense

• You have one retirement account and want simplicity
• You're not comfortable managing your own asset allocation
• You don't want to think about rebalancing
• Your 401(k) offers low-cost target-date INDEX funds

When to skip them

• You have multiple accounts and want to optimize asset location (stocks in taxable, bonds in tax-deferred)
• You want more control over your glide path
• The target-date fund in your 401(k) has high fees (>0.30%)
• You already have a three-fund portfolio and prefer that approach

The three-fund portfolio alternative

Instead of a 2050 target-date fund, you could manually build:

• 54% U.S. stocks (VTI / VTSAX)
• 36% International stocks (VXUS / VTIAX)
• 10% Bonds (BND / VBTLX)

Then rebalance once or twice a year. This gives you more control and potentially lower fees, but requires more attention.

The bottom line

Target-date funds are a great default choice, especially for hands-off investors. They prevent common mistakes like selling during crashes or holding too much stock in your 60s.

But they're not magic. If you're comfortable with the three-fund portfolio and want to save 0.05-0.10% in fees annually, that's a valid choice too.

The most important thing is picking one approach and sticking with it for decades. Consistency beats optimization.