Washington is laying the groundwork to potentially broaden what can sit inside America's 401(k) plans. The U.S. Department of Labor has issued a proposed rule detailing how 401(k) fiduciaries—employer committees legally responsible for investment decisions—should assess so-called "alternative" assets such as private equity, private credit and digital assets. The proposal stems from an executive order President Donald Trump signed in August 2025 directing the agency to expand retirement-plan access to alternative investments. Rather than endorsing any specific asset class or requiring plans to add new options, the rule outlines a documented review process—effectively a compliance checklist—and offers a "safe harbor" intended to shield employers who follow that process if participants later challenge the decision. For now, the proposal does not place Bitcoin or private funds directly into 401(k) menus. Market participants see it as an initial step that would establish the legal framework employers could use to add alternatives later. The stakes are sizable. Americans held $10.1 trillion in 401(k) plans alone at the end of 2025, according to the Investment Company Institute. Even a modest shift in allocations could channel significant capital toward private markets, a long-standing goal for private equity and private credit managers. A 60-day public comment period began after publication. Any final rule would come only after revisions and the legal scrutiny that typically follows, a timetable that could slow adoption and reduce the risk of abrupt changes for workers. Despite headline attention on cryptocurrency, many analysts view private credit and private equity as the more likely first wave of "alternatives" in retirement plans. Institutional investors already use these strategies widely, and that familiarity can help fiduciaries craft a defensible rationale. Crypto, by contrast, faces higher hurdles around valuation, custody and compliance. Private markets generally involve assets that do not trade on public exchanges. Private credit funds lend directly to businesses outside public bond markets. Private equity funds take ownership stakes in companies, often before they list publicly. Supporters point to long-term performance at large institutions; critics counter that the 401(k) channel is also a massive distribution opportunity for an industry historically built around institutional clients. Risk concerns center on fees, valuation and liquidity. Alternative funds often carry layered costs—management fees, performance fees and administrative expenses—that can be hard for non-specialists to parse. For a saver in their forties with $150,000, the difference between paying 0.05% annually in a low-cost index fund and 1.5% or more in an alternatives structure can compound into tens of thousands of dollars over two decades. Pricing mechanics are another challenge. Typical 401(k) holdings are priced daily, allowing straightforward rebalancing and withdrawals. Private assets are commonly valued quarterly based on appraisals and models, which can create fairness issues when participants buy in and out at different times. Solutions often require specialized fund "wrappers" designed to manage valuation and liquidity, adding more complexity and cost. Liquidity constraints may be the most tangible issue for everyday savers. Private assets can be difficult to sell quickly, and during periods of market stress, redemption limits can delay or restrict access to funds. The 2022 rate shock tested liquidity in some large private structures amid elevated redemption pressure, offering a glimpse of potential strain. Even proponents expect a slow rollout. TD Cowen's financial services policy analyst said it could take years before the rule has meaningful impact, as fiduciaries may wait for courts to validate that the safe harbor protections hold. Large employers are unlikely to volunteer as early legal test cases, and target-date funds—where much retirement money is concentrated—typically adjust strategies only after long evaluation cycles. A more plausible near-term outcome is limited, optional allocations for a subset of participants, extended fiduciary reviews and incremental additions. For crypto, meaningful inclusion may be more likely through regulated vehicles such as Bitcoin ETFs rather than direct holdings, and only after extended periods of price stability and clearer regulation. If a plan introduces alternative options, key questions include: What allocation limits apply and are they capped? What are the all-in fees across every layer of the structure? How does liquidity work when markets—especially crypto markets—turn volatile? The rule now being drafted is intended to ensure those questions can be answered clearly. Wall Street is watching closely. The investors most eager to see alternatives inside 401(k) plans are not typical retirement savers, but asset managers seeking access to trillions in retirement capital—and a regulatory framework that allows them to make their case.