The most consequential 401(k) regulation in years is not being decided in a hearing room. It is being decided by Labor Department staff reading public mail — roughly 45,000 pieces of it.
A Record Comment Haul
The proposal, formally titled "Fiduciary Duties in Selecting Designated Investment Alternatives," was released by the Labor Department's Employee Benefits Security Administration on March 30, 2026 and published in the Federal Register the following day. The comment period closed June 1, 2026, and the docket recorded 44,906 comments.
For scale: the 2024 fiduciary rule, a genuine industry flashpoint, drew roughly 20,000.
EBSA head Daniel Aronowitz had openly invited the deluge. "The details matter," he said when the proposal dropped. "Team EBSA is proud of our effort. But now it is your turn to comment on the record. Tell us how we can make the proposed rule better before we work on the final rule."
What the Rule Would Actually Do
The proposal does not require any plan to offer anything. It creates a process-based safe harbor for fiduciaries selecting investment options, built around six factors: performance, fees, liquidity, valuation, benchmarks, and complexity. The rule includes roughly 20 illustrative examples of what a prudent selection process looks like.
Critically, it is asset-class neutral. The same framework covers private equity, private credit, real estate, commodities, cryptocurrency, and lifetime income products. Acting Labor Secretary Keith Sonderling described the rule as "decidedly neutral," with the department's focus on process rather than product. The proposal follows the August 7, 2025 executive order, "Democratizing Access to Alternative Assets for 401(k) Investors."
The Split in the Record
Supporters — including the Investment Company Institute, Vanguard, Aon, and the ERISA Industry Committee — framed it as protection for fiduciaries doing honest work. ERIC's Andy Banducci said the safe harbor "will help reaffirm that federal law requires plans to have a prudent process, not perfect outcomes."
Opponents were pointed. The attorneys general of California, Illinois, New York, Pennsylvania, and Oregon warned the rule increases participant exposure to private credit, crypto, and alternatives savers may not understand. Morningstar cautioned that a presumption of prudence could effectively lower fiduciary standards, and pushed for firmer requirements on disclosure, valuation, liquidity, and conflicts of interest. Democratic lawmakers called the six-factor test a "check-the-box" exercise.
A third group simply wanted their corner clarified: the Insured Retirement Institute asked that annuities be expressly recognized; Empower flagged unintended uncertainty around stable value funds and managed accounts.
Notably, even a supporter is skeptical adoption follows. Aon's Ari Jacobs noted plan sponsors still face "hesitation driven by ongoing litigation risk and uncertainty."
What This Means for Your Account
Nothing changes today. The department's own regulatory agenda pointed to August 2026 for analyzing comments, with a final rule possible later this year and realistic implementation in 2027.
Four things worth doing now:
- Read your target-date fund's fact sheet, not just the menu. If alternatives arrive, they will most likely arrive inside your default fund — not as a checkbox you actively select.
- Track three numbers if they do: expense ratio, liquidity terms, and how often the holding is valued. Illiquid assets priced quarterly behave nothing like a daily-priced index fund.
- Commodities are on the list. If you already hold metals or hard assets outside your plan, a new plan sleeve could quietly double your exposure. Measure allocation across all accounts, not per account.
- Remember what the safe harbor protects. It shields the fiduciary's process. It does not guarantee your outcome.
A 45,000-comment record is not a formality. It is a signal that reasonable people still disagree sharply about what belongs in a retirement plan — and that is worth knowing before something new shows up in yours.
Sources: U.S. Department of Labor – EBSA news release (March 30, 2026); PLANADVISER – Reading 45,000 Comments on DOL 401(k) Investment Selection Rule; 401(k) Specialist – DOL Investment Selection Rule Draws Nearly 37,000 Comments; 401(k) Specialist – DOL Alternative Assets Rule Draws Final Industry Comments; Morgan Lewis – DOL Proposes Rule on Fiduciary Duties for Selecting 401(k) Plan Investment Options; SBA Office of Advocacy – EBSA Proposed Rule on Fiduciary Duties in Selecting Designated Investment Alternatives