For one employer plan during accumulation, a low-cost target-date fund is close to the complete answer: diversified, rebalanced automatically, and it removes the decision people most often fail to make. It runs out in four specific places — when a pension changes how much equity you can hold, when money sits across several accounts, when a taxable account could be tax-loss harvested, and once withdrawals begin. The common right answer is both: keep the plan in the fund, manage everything else around it.
What a target-date fund already does for you
A target-date fund is a single holding that contains a whole diversified portfolio and gradually shifts from stocks toward bonds as the target year approaches. Buy the 2055 fund, contribute, ignore it. For an enormous number of people that is the entire correct answer, and any adviser who tells you otherwise without asking about the rest of your life is selling.
| Target-date fund | Managed portfolio | |
|---|---|---|
| Diversification | Built in, global, across asset classes | Built for you |
| Rebalancing | Automatic, inside the fund | On a schedule and on judgement |
| Glide path | Set by the fund, same for everyone with your target year | Set to your circumstances |
| Typical cost | Roughly 0.08%–0.75% depending on the fund | Fund costs plus the advisory fee |
| Tax-loss harvesting | Not possible — it is one holding | Available in taxable accounts |
| Asset location across accounts | No | Yes |
| Accounts for a pension | No | Yes |
| Effort required from you | Almost none | A conversation, then almost none |
Where the target-date fund wins outright
- Inside a 401(k) or 403(b), during accumulation. No taxable account means no harvesting to lose and no location decisions to make. The fund is doing everything available.
- When the alternative is indecision. A default that gets used beats a bespoke portfolio that never gets built.
- When the fee difference is large and the situation is simple. A cheap index-based target-date fund at under 0.15% is one of the best products retail investors have ever had.
Check yours, though. Target-date funds are not interchangeable: two 2050 funds from different providers can differ by 15 percentage points in equity allocation and by more than half a percent in cost. Your plan’s 404(a)(5) fee disclosure has the number.
Where it runs out
- A pension changes the arithmetic. A CalPERS or CalSTRS benefit behaves like a large bond holding you already own. Someone with a substantial pension can usually hold more equity than the fund's glide path assumes — the fund does not know the pension exists. Seven California systems, each with a guide →
- Money in more than one place. The fund optimises one account. Asset location — which holdings sit in the 401(k), the Roth and the taxable account — is a multi-account decision and is worth real money over decades.
- A taxable account. One holding cannot be tax-loss harvested. What harvesting does →
- The withdrawal years. A glide path is not a spending strategy. Which account to draw from, in what order, against which tax bracket, alongside Social Security timing and required distributions — none of that is inside the fund.
- The date is not your retirement date. People pick the year they turn 65 out of habit. If you intend to work to 70, or stop at 58, the fund is on the wrong path.
The answer is usually both
A common and sensible arrangement: the employer plan stays in a low-cost target-date fund because the plan menu is limited anyway, while the IRA and taxable accounts are managed around it — with the target-date fund counted as part of the whole allocation rather than ignored. That is cheaper than managing everything and better than managing nothing, and it is what we recommend more often than people expect.
Common questions
Are target-date funds a good investment?
For most people accumulating inside an employer plan, yes — particularly the low-cost index-based ones. They are diversified, automatically rebalanced, and they remove the decision that most often goes unmade.
Should I pick a fund with a later date to be more aggressive?
People do this, and it works mechanically, but it is a blunt instrument. It changes your stock allocation and your bond duration and your glide path all at once. If you want more equity, it is usually better to say so directly than to lie to the fund about your age.
Can I hold a target-date fund in an IRA?
Yes. Whether you should depends on whether you have a taxable account or other holdings that would benefit from coordination.
Would you tell me to just use a target-date fund?
We do tell people that, regularly, and it earns us nothing. If you have one plan, one income, no pension and thirty years, contribute more and stop reading.
Not sure whether yours is enough?
Bring the fund name and your plan's fee disclosure. Fifteen minutes, free, and often the answer is to change nothing.