Three Lesser-Known But Powerful 401(k) Features

September 12, 2026

AI Summary

5 min read

"Only about 1% to 3% of eligible participants use it." That is the startling statistic Robert Brokamp opens with when discussing the self-directed brokerage account inside a 401(k)—a feature that roughly one in four plans offers but almost no one touches. On this Saturday personal finance edition of the Motley Fool Hidden Gems Investing podcast, Brokamp walks through three lesser-known but potentially powerful 401(k) features: the self-directed brokerage account, the mega backdoor Roth, and the rule of 55. Each comes with important caveats, because not every plan offers them, and the rules are layered with IRS complexity. But for those who can access them, they open up flexibility and tax advantages far beyond the standard contribution limits and fund menus.

The Self-Directed Brokerage Account: More Than Just Stocks

The most basic of the three features is also the most underused. About 20% to 30% of 401(k) plans offer a self-directed brokerage account, which lets participants invest beyond the typical slate of 15 to 25 mutual funds. That could mean a broader range of mutual funds, exchange-traded funds, or even individual stocks and bonds. Brokamp suggests the low utilization rate—1% to 3%—is largely due to participants simply not knowing the option exists.

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What you'll learn

1 (00:02) **Three Lesser-Known 401(k) Features** - Introduction and context for the episode, including an invitation for listener questions.
2 (01:46) **Feature 1: The Self-Directed Brokerage Account** - This feature allows investors to buy investments beyond the standard menu of mutual funds.
3 (03:09) **Caveat on Self-Directed Accounts** - A brief warning about responsible use of this feature.
4 (05:00) **Feature 2: The Mega Backdoor Roth** - An explanation of how to supercharge Roth savings using after-tax contributions.
5 (07:14) **Converting After-Tax Savings to Roth** - The key strategy that makes after-tax contributions powerful.
6 (09:06) **Complexities and Cautions of the Mega Backdoor Roth** - Important technical details and warnings.
7 (10:13) **Why Many Plans Don't Offer the Mega Backdoor Roth** - The practical barrier to using this strategy.

+ Full timestamped outline available in the app

Guests on this episode

Robert Brokamp

Show Notes

In celebration of National 401(k) Day (which was this past Thursday), Robert Brokamp covers three employer-sponsored plan features that often fly under the radar – partially because they can be complex, and partially because many plans don’t offer them.
In this episode, Robert discusses:
-Advocating with your employer for more features and better investment choices
-How a self-directed brokerage within can help both the stock and non-stock side of your portfolio
-How to implement the mega backdoor Roth
-How the rule of 55 (or 50) can allow some people to make withdrawals a few to several years before age 59 1/2 and avoid the 10% early distribution penalty.
Have a question for our upcoming financial planning mailbag episode? Email it to [email protected].

Host: Robert Brokamp, CFP®, EA
Engineer: Bart Shannon

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