A target-date fund is a complete retirement portfolio you can buy in one step. Pick the fund dated closest to your planned retirement, check that its yearly fee is low, and then leave it alone. Adding other funds beside it undoes the mix it was built to manage.
Many savers who know they should invest never touch the fund list in their 401(k). Building a mix of stock and bond funds feels like a test they could fail, so the money sits in cash or in a default they never chose.
The answer is almost always on that list. Vanguard’s How America Saves 2026 report found target-date funds in 96% of the retirement plans it administers.
Everything intimidating about building a portfolio happens inside a single target-date fund. It spreads your money across stock and bond funds, rebalances as prices move, and shifts toward bonds as its year approaches. Choosing one and leaving it alone is a strategy, not laziness.
A robo-advisor does similar work, but it’s a separate account you open. A target-date fund sits inside the 401(k) or IRA you already have.
Treat the year in the fund’s name as a risk dial rather than a deadline. If you’re 30 years from retiring, the fund nearest that year and the one a decade later hold nearly the same mix today, mostly stocks. The later one stays heavier in stocks as you near retirement, so choose it only if you’d keep investing through a steep drop in your last working years. One dated a decade earlier does the reverse.
Then check the expense ratio, the yearly fee taken out of your balance. Vanguard’s Target Retirement 2055 Fund costs 0.08% a year. Fidelity’s actively managed Freedom 2055 Fund, built for the same year, costs 0.68%. On $100,000, that’s $680 a year instead of $80. In an IRA, where the choice of fund company is yours, pick one near the low end.
Adding a second fund is where it goes wrong. Split each contribution with an S&P 500 index fund, and that half never shifts toward bonds. By retirement you’d hold far more stock than the fund’s schedule calls for, and the fund can’t rebalance money it doesn’t own.
Once you’ve picked the year, every change to the mix is a decision the fund was built to make for you.
Editorial & Advertiser Disclosure: The editorial content on this page is not provided, commissioned, reviewed, approved, or otherwise endorsed by any advertiser. Opinions expressed here are ours alone, not those of any advertiser. The offers that appear on this site are from companies that compensate us. That compensation may influence which products we cover and where and how they appear on a page – including the order in which they appear – but it does not influence our evaluations, ratings, or opinions. We do not include every company or offer available in the marketplace.
Related:
