Plan sponsors are under growing pressure to improve participant outcomes while maintaining disciplined fiduciary process. Fee scrutiny has increased, committee members have less discretionary time, and documentation standards keep rising. In that context, one decision drives many others: whether to retain a 3(21) advisor relationship or appoint a 3(38) investment manager.
The technical distinction is straightforward. The operational impact is what matters most. If you choose the wrong model for your internal bandwidth, your process may look acceptable on paper while execution lags in practice.
What a 3(21) arrangement means
Under a 3(21) model, the advisor provides recommendations, research, and monitoring support, but the plan committee retains final decision authority. This can work well when committees are engaged and want active control over fund line item changes.
- Committee keeps decision rights over lineup changes.
- Advisor provides investment analysis and recommendations.
- Documentation burden remains heavily on sponsor governance process.
Sponsors often prefer 3(21) when they have a mature committee cadence and members with the time to evaluate recommendations in detail. It allows flexibility, but it also requires consistency. Delayed approvals and infrequent reviews can create process gaps quickly.
What a 3(38) arrangement changes
In a 3(38) model, the advisor or delegated investment manager assumes discretionary authority to select, monitor, and replace investment options according to an agreed framework. The sponsor still has oversight responsibilities, but day- to-day investment decision execution shifts to the manager.
- Investment decisions can be implemented faster and more consistently.
- Committee meetings shift toward oversight and participant outcomes.
- Fiduciary exposure tied to investment selection is meaningfully reduced.
How to decide which model fits
Most committees should assess this through three questions. First, do we have a dependable cadence for reviewing recommendations and documenting decisions? Second, are we comfortable owning decision latency if market conditions or manager quality changes quickly? Third, do we want committee time focused on investments or on participant strategy, plan design, and communication?
If your committee is highly engaged and values direct control, 3(21) can still be a strong option. If your committee is stretched or wants more efficient execution, 3(38) often creates cleaner governance and stronger implementation discipline.
Implementation best practices in either model
- Maintain a current investment policy statement with explicit review triggers.
- Use benchmarking data annually for fees, participation, and line-up quality.
- Track committee decisions, rationale, and follow-ups in centralized records.
- Review participant behavior metrics, not just fund performance.
The strongest plans treat fiduciary governance as an operating system, not a compliance checklist. Whether you delegate discretion or keep it in-house, process quality is what protects committee members and improves participant outcomes.
Final thought
Choosing between 3(21) and 3(38) is less about ideology and more about alignment. Match your fiduciary model to the way your committee actually works. The right structure removes friction, sharpens accountability, and lets your plan team focus on what matters: helping employees retire with confidence.