401(k) PlansIf you have never actively chosen your 401(k) investments, you are almost certainly in a target-date fund — the plan put you there. It is not a bad place to be. But "the default" and "the best choice for you" are not always the same thing.
A target-date fund automatically diversifies and de-risks you over time, which is genuinely valuable. The cost is that it glides on a fixed schedule regardless of market conditions and never steps aside in a downturn. Whether that trade is worth it depends on how involved you are willing to be.
What a target-date fund gets right
- Instant diversification. One fund holds U.S. stocks, international stocks, and bonds.
- Automatic de-risking. It shifts toward bonds as your date nears, so you are not caught over-exposed.
- Behavioral protection. A single, professionally managed fund makes panic-selling less likely.
Where the cost hides
The glide path is keyed to your date, not to market conditions. It moves toward bonds on a schedule whether or not that is the right moment, and — crucially — it rides every crash fully, because it is designed to stay the course rather than react. Over a long horizon that "always fully invested, always on schedule" design can leave meaningful growth on the table versus a more deliberate mix.
Load the "L 2030 / target-date" style position below, then move toward a custom mix and watch the projection change:
So — keep it or not?
If you genuinely will not review your account and you value never thinking about it, a low-cost target-date fund is a defensible, sensible home. If you are willing to spend a few minutes a month, a deliberate mix reviewed with discipline usually does better. The allocation-by-age framework is a good starting point, and you can compare directly against your target-date fund in the 401(k) Calculator.
The part that actually matters: discipline
A sound allocation only helps if you hold it through the rough stretches and change it for the right reasons. That is the idea behind the 401(k) Edge strategy — a rules-based monthly update that works with any plan and any provider, so your 401(k) follows evidence instead of emotion. Most months, it says do nothing.