Target-date funds are one of the most common default options in retirement plans, and for good reason. They are simple, diversified, and easy to use. You pick the fund closest to your expected retirement year, and the fund gradually adjusts over time—typically becoming more conservative as retirement approaches.
That simplicity can be valuable.
A good target-date fund handles several important jobs for the investor: diversification, rebalancing, and the gradual shift from a more aggressive allocation to a more conservative one. For many people, especially those who want a hands-off approach, that structure can help them stay invested and avoid costly emotional decisions.
But convenience still has a cost.
Many target-date funds are essentially pre-built portfolios made up of the same broad stock and bond funds an investor could own directly. The fund may hold U.S. stocks, international stocks, U.S. bonds, and international bonds in one packaged solution. In some cases, a similar allocation could be recreated using individual low-cost index funds or ETFs.
The difference in cost may look small at first. For example, assume a target-date fund has an annual expense ratio of 0.27%, while a comparable low-cost blend of individual index funds has a blended expense ratio of approximately 0.04%.
That is a difference of just 0.23% per year.
But over time, small differences can compound into real dollars.
Consider a hypothetical investor who starts with $100,000, contributes $500 per month, and remains invested for 30 years. Assume the portfolio earns 7% annually before fund expenses.
Using the target-date fund with a 0.27% expense ratio, the account would grow to roughly $1.28 million over 30 years.
Using a lower-cost recreated allocation with an estimated expense ratio of 0.04%, the account would grow to roughly $1.36 million.
The difference is about $73,800.
That does not mean target-date funds are bad. It means investors should understand what they are paying for.
For some investors, the added cost may be entirely reasonable. A target-date fund provides automation. It rebalances for you. It adjusts risk over time. It reduces the need to make ongoing allocation decisions. Those behavioral benefits can be meaningful, especially for investors who might otherwise ignore their account, hold too much cash, or make reactive changes during market volatility.
The tradeoff is responsibility.
If you build the allocation yourself, you also take on the work. You need to choose the funds, monitor the allocation, rebalance periodically, and adjust the risk level as retirement gets closer. A lower-cost portfolio is not automatically better if it is poorly maintained or repeatedly changed in response to market headlines.
So the question is not simply, “Which option is cheaper?”
The better question is: “What am I getting for the added cost, and would I manage the portfolio properly on my own?”
For a hands-off investor, a target-date fund may still be a practical and disciplined solution. For a more engaged investor, or one working with an advisor, a custom mix of low-cost funds may offer more flexibility and lower ongoing costs.
As with most planning decisions, the right answer depends not just on the math, but on the investor.
This example is hypothetical and for illustrative purposes only. It does not reflect taxes, trading costs, plan-level fees, changes in fund expenses, or differences in actual investment performance. Investment returns are not guaranteed, and lower expenses do not guarantee better outcomes.