Target-Date Funds: One Fund That Rebalances Itself
For most people a single low-cost target-date fund beats a portfolio they built and stopped maintaining.
At a glance
Figures checked 1 Sep 2026
What to take away
- The glide path shifts from stocks to bonds automatically as the target year approaches.
- Check whether it is built from index funds or active ones — the fee difference is large.
- "To" and "through" glide paths behave differently after the target year.
A target-date fund holds a diversified mix and gradually reduces its stock allocation as the named year approaches. You pick the fund closest to when you expect to start withdrawing and leave it alone.
Three things to check
- The expense ratio. Index-built target-date funds cost a fraction of actively built ones.
- The glide path shape. A “to retirement” fund reaches its most conservative allocation at the target year; a “through retirement” fund keeps reducing for years afterwards.
- The allocation at the target year, which varies widely between providers — anything from 30% to 55% in equities.
Holding a target-date fund plus a handful of other funds undoes the design. The fund is a complete portfolio; surrounding it with satellites changes the allocation in ways nobody is tracking.
Common questions
It works mechanically, but it is clearer to choose the allocation you want directly rather than misusing the date label.
Less so. They rebalance internally, which can generate distributions. They suit tax-advantaged accounts better.