Target-Date Funds: The 401k Default That’s Actually Pretty Good. With One Catch

Key takeaways

Your employer’s default is probably fine: For most 401(k) participants with limited fund options, a target-date fund is a genuinely good starting point, you likely don’t need to switch.
The expense ratio is the only number that really matters: The fee gap between a low-cost index-based target-date fund (~0.08%) and an actively managed one (~0.75%) can cost you roughly $50,000 in lost compounding over 30 years.
Index-based beats actively managed, consistently: About 90% of actively managed funds underperform their benchmark index over 15 years, the active management in pricier target-date funds rarely earns its cost.
The 0.20% threshold is your quick gut-check: Under 0.20% expense ratio, stay put and focus on increasing contributions; above 0.50%, check whether cheaper index funds exist in your plan.
Pick the target year closest to when you turn 65: Choosing an earlier year to feel “more conservative” reduces growth potential during the decades when compounding matters most.

Your employer already made a pretty good choice for you

You started a new job, filled out the 401k paperwork, and now you’re staring at a line that says something like “Vanguard Target Retirement 2060”, wondering if you accidentally agreed to something you don’t understand.

Here’s the verdict, up front: for most people in a 401(k) with limited fund options, a target-date fund is a genuinely good default. You are probably not in the wrong thing. You can relax.

That said, this piece is not going to tell you target-date funds are perfect and leave it there. There is one real catch, and it has to do with fees. The fee difference between a good target-date fund and a bad one can cost you tens of thousands of dollars over 30 years, not in some abstract “it adds up” way, but as a specific dollar amount we’ll show you shortly.

Good default, one real catch, and a clear way to check whether your specific fund clears the bar. That’s what this piece covers.

What a target-date fund actually does (and why the year in the name matters)

A target-date fund is a single fund that holds a mix of stock index funds and bond index funds, and automatically shifts toward more bonds as the target year approaches. You buy one fund. It manages the mix for you.

The year in the name is meant to match roughly when you’ll retire. If you’re 25 today and plan to retire around age 65, you’d pick a fund with a target year around 2065. The fund assumes you have decades of growth ahead, so it starts out holding mostly stocks. As the years pass, it gradually shifts toward bonds, which are less volatile but also grow more slowly.

This automatic shift is called a glide path: the fund’s stock-to-bond ratio glides from aggressive to conservative over time.

Here’s what that looks like in practice. A 2060 target-date fund today holds roughly 90% stocks and 10% bonds. By 2060, that same fund will hold closer to 50% stocks and 50% bonds. The fund makes that shift automatically, year by year, without you doing anything.

Look at the timeline below. The left side of the chart is where you are now, mostly stocks, because you have time to ride out market swings. The right side is where the fund ends up, more bonds, because you’re closer to needing the money. The slope between those two points is the glide path. The whole point is that the fund gets more cautious as you get older, automatically.

What’s actually inside the fund?

A target-date fund isn’t a mystery box. It’s a wrapper around other funds. Take the Vanguard Target Retirement 2060 fund as an example. According to Vanguard’s fund holdings data, it holds four underlying index funds:

Vanguard Total Stock Market Index Fund
Vanguard Total International Stock Index Fund
Vanguard Total Bond Market Index Fund
Vanguard Total International Bond Market Index Fund

That’s it. Four broad, diversified index funds, automatically rebalanced and gradually shifted over time. If you built that yourself, you’d own essentially the same thing, just without the automatic management.

How to pick the right target year

Pick the fund closest to the year you turn 65. Not the year you hope to retire early. Not an earlier year because you’re nervous about stocks. The year you turn 65.

If you pick an earlier year, say, a 2045 fund when you’re 25, you’re telling the fund to start shifting toward bonds sooner than you need to. That means less growth potential during the decades when compounding does its best work. Pick the year that matches your actual retirement horizon.

The one catch: what the convenience fee actually costs you

Here’s where the honest part comes in.

An expense ratio, the annual fee a fund charges, expressed as a percentage of your investment and deducted automatically from the fund’s returns, is the number that determines how much of your growth you actually keep. You never write a check for it. It just quietly reduces your balance every year.

For most index funds, expense ratios are tiny. VTI, the Vanguard Total Stock Market ETF (exchange-traded fund, a type of fund you can buy like a stock), charges 0.03%. That’s $3 a year on every $10,000 you have invested.

Target-date funds charge a bit more, because they’re doing the management work for you. How much more depends entirely on which fund family you’re in.

Here are real numbers for three common fund families:

Fund Family	Type	Expense Ratio
Vanguard Target Retirement series	Index-based	~0.08%
Fidelity Freedom Index series	Index-based	~0.12%
Fidelity Freedom series (non-index)	Actively managed	~0.75%

Sources: Vanguard Target Retirement fund expense ratio data and Fidelity Freedom fund expense ratio data.

The first two are index-based. The third, the Fidelity Freedom series without “Index” in the name, is actively managed. That means a team of people is picking the underlying funds, and you’re paying for that.

What does the difference actually cost?

Let’s make this concrete. Assume you contribute $300 a month to your 401(k), earn an average 7% annual return, and invest for 30 years.

At a 0.08% expense ratio (Vanguard Target Retirement), you’d pay roughly $7,000 in total fees over that period, measured in lost growth.

At a 0.75% expense ratio (Fidelity Freedom non-index), you’d pay roughly $57,000 in total fees over that same period.

That’s a difference of about $50,000, not in fees you write a check for, but in compounding growth those fees would have generated if they’d stayed in your account. That’s not a rounding error. That’s a meaningful chunk of your retirement balance.

Even the smaller gap, 0.08% versus 0.12%, Vanguard versus Fidelity Freedom Index, adds up to roughly $8,000 over 30 years on that same contribution. Smaller, but real.

The point is not that target-date funds are bad. The point is that the expense ratio matters, and the range between fund families is wide enough to be worth checking.

The SPIVA (S&P Indices Versus Active) scorecard from S&P Dow Jones Indices consistently shows that roughly 90% of actively managed funds underperform their benchmark index over a 15-year period. That’s the data behind why index-based target-date funds tend to win over actively managed ones: lower fees, and the active management rarely earns its cost.

How to check whether your specific target-date fund is worth keeping

You don’t need to be a finance expert to evaluate your fund. You need three steps and about five minutes.

Step 1: Find the expense ratio

Log into your 401(k) account. Find the fund you’re in, it’ll have a name like “Target Retirement 2060” or “Freedom Index 2065.” Click on it. Look for a line labeled “net expense ratio” or “annual operating expenses.” That’s the number you want.

If you can’t find it in the account interface, search for the fund’s name plus “fact sheet” or “prospectus.” The SEC’s Investor.gov fund search tool also pulls fee data from regulatory filings.

Step 2: Apply the threshold

Here’s a practical rule: an expense ratio below 0.20% for a target-date fund is generally acceptable. Above 0.50% is worth investigating whether cheaper alternatives exist in your plan.

This threshold is an editorial judgment, not a regulatory standard. But it’s a useful starting point.

Under 0.20%: You’re in a reasonable place. Stop optimizing and increase your contribution rate instead.
0.20% to 0.50%: Worth a look at what else your plan offers, but not urgent.
Above 0.50%: Check your plan’s other fund options. You may be able to do better.

Step 3: Check what else your plan offers

Open your plan’s full fund menu. Look for a total US stock market index fund or an S&P 500 index fund. Note its expense ratio.

If the cheapest index fund in your plan charges 0.03% to 0.05%, the do-it-yourself alternative is worth considering. If the cheapest alternative charges 0.40% or more, your target-date fund may still be the better option, because the alternative isn’t actually cheap.

The two outcomes are:

Stay in the target-date fund. This is the right answer for most people, especially if the fund is index-based and charges under 0.20%.
Build a simple two- or three-fund portfolio from cheaper underlying funds. This is worth considering if your plan has genuinely cheap index funds and your target-date fund charges over 0.50%.

The DIY alternative: a three-fund portfolio that does the same job for less

If you decide to investigate the alternative, here’s what it looks like.

A three-fund portfolio holds three things:

A US total market index fund (covers the entire US stock market)
An international stock index fund (covers stocks outside the US)
A bond index fund (covers US bonds)

For a 25-year-old, a reasonable starting allocation is 80% US stocks, 10% international stocks, and 10% bonds. That approximates what a 2060 target-date fund holds today, mostly stocks, with a small bond cushion.

If your plan offers these three fund types at low cost, you could build this yourself and pay less in fees than a target-date fund charges.

The one real cost of doing it yourself

The target-date fund does two things automatically: it rebalances your portfolio when the allocations drift, and it shifts the stock/bond mix as you age. If you build the three-fund portfolio yourself, you have to do both of those things manually.

In practice, that means once a year you open your account, check whether your allocations have drifted from your targets, and move money between funds to get back to your target percentages. Every five to ten years, you should also revisit whether your stock/bond split still matches your age and timeline.

That’s roughly 20 minutes a year. It’s not complicated. But it is a real task that requires you to actually do it.

The decision framework

If your plan’s target-date fund charges under 0.20%: stay in it. The convenience is worth the small premium. Spend your energy increasing your contribution rate instead.
If your plan’s target-date fund charges over 0.50% and your plan offers cheap index funds at 0.05% or below: the three-fund approach is worth the annual 20-minute rebalance. The fee savings over 30 years are real.
If you’re not sure you’ll actually do the annual rebalance: stay in the target-date fund. A slightly higher fee beats a portfolio that drifts out of alignment because you forgot to check it.

The verdict: what most people in their 20s should actually do

If you are in a Vanguard Target Retirement fund or a Fidelity Freedom Index fund, you are in a good place. The expense ratios are low, the underlying funds are broad and diversified, and the automatic glide path means you don’t have to think about rebalancing. Stay there. Increase your contribution rate. Stop optimizing.

The IRS sets the 401(k) employee contribution limit at $24,500 for 2026 for workers under age 50. Most people in their 20s aren’t hitting that limit. Getting closer to it matters more than shaving 0.04% off your expense ratio.

If you are in a Fidelity Freedom fund without “Index” in the name, or any actively managed target-date fund charging above 0.50%, open your plan’s fund menu and check whether a cheaper index-based alternative exists. If it does, switching is worth the ten minutes it takes.

The one action worth taking today

Find your fund’s expense ratio. It takes about two minutes. Apply the 0.20% threshold. If you’re under it, close the tab and go do something else. If you’re over 0.50%, spend another five minutes checking your plan’s alternatives.

On picking the right target year

Pick the fund closest to the year you turn 65. Do not pick an earlier year to be “more conservative”, doing that reduces your growth potential during the decades when compounding matters most. If you’re 25 and plan to retire at 65, a 2065 fund is the right choice.

A note on what this is

Everything in this piece is educational content. We are not a registered investment advisor, and nothing here is personalized financial advice. The fund families named. Vanguard, Fidelity, are worked examples to show you how to evaluate expense ratios, not recommendations to buy any specific fund. Your situation is yours. The framework here helps you think through it; a financial advisor helps you apply it to your specific numbers.

The goal is straightforward: you leave this page knowing whether your target-date fund is worth keeping, and you have a clear process to check. Most people will find they’re already in a reasonable place. The ones who aren’t will know exactly what to look for next.