The Portable Default: Custom Target-Date Investing as Menu, QDIA, and Conversion Destination

Target-Date Investing Is at the Center of the Plan

Target-date funds have become the core of the defined contribution system. Industry data put total target-date assets at roughly $4.8 trillion at the end of 2025, up more than 20 percent in a single year. Surveys consistently show that target-date funds serve as the qualified default investment alternative in most plans, with estimates ranging from roughly 86 percent of plans to nearly every plan that designates a default. They are also the largest recipient of ongoing participant contributions. In practice, the target-date fund already serves two roles: it is the anchor of the investment menu and the plan’s QDIA.

But as the Department of Labor reminded fiduciaries in its 2013 guidance, not all target-date funds are alike. Funds with the same year on the label can differ markedly in glide path, underlying holdings, and cost. The guidance specifically urged fiduciaries to consider whether a custom or non-proprietary fund would be a better fit, in part to reduce a plan’s exposure to any single fund provider. A custom target-date solution answers that directly: it separates the retirement-date decision from the risktolerance decision, so participants are not forced off their glide path to adjust risk; it is built from multiple outside managers rather than one proprietary fund family; its fees are transparent rather than layered; and it is monitored under the same documented discipline applied across the rest of the menu.

The Overlooked Half of Monitoring

Deep adoption has quietly created a second monitoring duty, and the DOL’s guidance frames both. The first is monitoring the investment itself, its glide path, holdings, fees, and performance, for which a mature market of thirdparty analytical tools now exists. The second, easily overlooked, is monitoring fit: whether the selected series and glide path still match the plan’s participants, including their ages, their saving and withdrawal behavior, and whether they tend to retire “to” the target date or spend “through” it. The 2013 guidance makes clear that the right choice turns on the employee population.

In practice, the second duty rarely occurs. A committee can usually produce an analyzer report on the fund, but when asked how it validated the glide path against participants’ actual demographics and behavior through participant surveys or demographic analysis, the answer is too often silence. That gap isn’t a documentation issue; it’s about whether the default most participants hold was ever confirmed to suit them. A personalized solution narrows that gap by design: because participants choose a risk level alongside their horizon, the plan is no longer wagering that one off-the-shelf glide path fits an entire, heterogeneous workforce.

The Job No One Designs For: The Conversion Destination

ERISA requires fiduciaries to periodically review their service providers, and that review sometimes leads to selecting a new recordkeeper. When a plan converts, every participant’s balance in the old lineup must be redirected into the new lineup. There are three ways to do it: like-tolike mapping, in which each old fund is moved to a reasonably similar new fund under the Section 404(c)(4) mapping safe harbor; re-enrollment, in which participants are defaulted into the plan’s QDIA under the Section 404(c) (5) framework unless they opt out; and leaving participants to re-elect on their own.

Because most participant assets already sit in target-date funds, the target-date fund is where most balances are invested at conversion, whether by mapping an old targetdate fund to a new one or by re-enrolling defaulted participants into the QDIA. The target-date fund is, in effect, the de facto conversion destination. Here is the point most conversions overlook: the mapping and QDIA safe harbors protect the fiduciary from the consequences of participants not giving direction; they do not excuse an imprudent choice of destination. Selecting the destination is a fiduciary act.