Best ETFs for Your 401(k)
Your 401(k) has limited fund choices. Here is how to find the best options in your plan and avoid the expensive ones.
Don't have time? Here's what you need to know:
- 1Find the cheapest S&P 500 or total market index fund in your plan — expense ratio under 0.10% is the target
- 2Target-date funds are a valid one-decision option if they cost under 0.15%
- 3Contribute at least enough for the full employer match — that is instant 50-100% return
- 4If your plan's funds are expensive, max the match then redirect extra savings to a Roth IRA
Finding the Best Fund in Your 401(k)
Unlike a brokerage account where you can buy any ETF, a 401(k) limits you to a menu of 15-30 funds selected by your employer. The quality varies wildly — some plans offer Vanguard index funds at 0.03%, others have expensive actively managed funds at 0.75-1.00%. Your first job is finding the cheapest broad-market index fund on the menu.
Look for these keywords in fund names: 'Index,' 'S&P 500,' 'Total Market,' 'Total Stock.' Check the expense ratio (listed in the plan's fact sheets). If your plan has a Vanguard, Fidelity, or Schwab total market or S&P 500 index fund under 0.10%, use it as your core holding.
Best 401(k) Funds by Category
If your plan does not have a good index fund (expense ratio above 0.30%), contribute only enough to get the employer match, then redirect additional savings to a Roth IRA where you control the fund selection.
| Category | Look For | Expense Ratio Target | Example Funds |
|---|---|---|---|
| U.S. Stocks | S&P 500 or Total Market index | Under 0.10% | VFIAX, FXAIX, SWPPX |
| International Stocks | Total International index | Under 0.15% | VTIAX, FTIHX, SWISX |
| Bonds | Total Bond Market index | Under 0.10% | VBTLX, FXNAX, SWAGX |
| Target-Date | Target Retirement [Year] | Under 0.15% | Vanguard Target 2050, Fidelity Freedom 2050 |
| Avoid | Actively managed, 'growth,' 'opportunity' | Above 0.50% | Most actively managed funds |
How to Allocate Within Your 401(k)
The simplest approach: a target-date fund. Pick the one closest to your expected retirement year (e.g., Target 2055 for a 30-year-old). It automatically rebalances between stocks and bonds as you age. If your plan's target-date fund is under 0.15%, this is a legitimate one-decision strategy.
For more control: allocate 80-90% to the cheapest U.S. stock index fund and 10-20% to the cheapest international index fund. Hold bonds in the 401(k) only if you cannot get cheaper bond exposure elsewhere. Remember to look at your total allocation across all accounts, not just the 401(k) in isolation.
Tip: Check if your 401(k) has a 'brokerage window' option. Some plans let you invest in any ETF through a self-directed window — giving you access to VTI, VOO, and other low-cost options beyond the standard menu.
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Frequently Asked Questions
What if my 401(k) only has expensive funds?
Contribute enough to get the full employer match (free money), then invest additional savings in a Roth IRA where you can buy VTI at 0.03%. The employer match is worth the higher 401(k) fees. Beyond the match, lower-cost accounts win.
Should I use the target-date fund or build my own allocation?
If the target-date fund costs under 0.15% and you do not want to manage the allocation yourself, use it. If you want more control or the target-date fund is expensive (above 0.30%), build your own allocation from the cheapest index funds available.
How much should I contribute to my 401(k)?
At minimum, enough to get your full employer match. Ideally, 15-20% of your salary if you can afford it. The 2024 contribution limit is $23,000. If you cannot hit 15%, start at the match and increase by 1% every year.
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Alex Harrington
CFA Level II Candidate, Finance & Economics
Alex Harrington is an independent ETF researcher and personal finance writer with over 8 years of experience analyzing exchange-traded funds. A CFA Level II candidate with a background in economics, Alex has reviewed 800+ ETFs and helped thousands of beginners build their first investment portfolios through clear, jargon-free education.
This content is for educational purposes only and does not constitute financial advice. Past performance does not guarantee future results. Consult a licensed financial advisor before making investment decisions.