401k Fiduciary Responsibility Checklist (Roles, Calendar, Investments Oversight)

Managing a 401(k) plan means taking on legal responsibilities that go beyond routine administration.

The people responsible for overseeing the plan are expected to act in participants’ best interests and meet the fiduciary standards set by federal law.

A fiduciary responsibility checklist provides a practical way to review those obligations, keep key tasks on track, and support ongoing plan compliance.

Who Is a 401(k) Plan Fiduciary?

A 401(k) fiduciary is any person who, under the plan, exercises discretionary control over the plan

• Management
• Administration
• Investments, or
• Who gives investment advice for a fee.

Even if not officially designated, plan officials who make or implement discretionary decisions can incur fiduciary status.

Attorneys, accountants, and actuaries escape the designation when they’re acting solely in their professional, non-discretionary roles, giving legal advice, filing tax returns, and calculating actuarial projections.

But the moment any of them start exercising discretion over plan operations or assets, they are designated as a fiduciary.

Core Fiduciary Duties Under ERISA

Once a person is a fiduciary, ERISA imposes four fundamental duties.

1. Act solely in the interest of participants and beneficiaries

Fiduciaries must avoid conflicts of interest and self-dealing and must act prudently to maximize plan value for participants.

So, they must put participants’ interests first before anything.

2. Discharge duties with care, skill, prudence, and diligence

Fiduciaries must also make informed decisions through appropriate investigation and deliberation, not simply achieve good outcomes.

They should document decisions and the rationale behind them.

Courts will examine whether the fiduciary conducted a

• Thorough review
• Obtained advice when needed
• Considered alternatives, and
• Acted consistently with plan objectives.

3. Diversify plan investments

Plan assets should generally be spread across asset classes, industries, and securities so that a downturn in one area does not decimate the plan.

ERISA recognizes exceptions and provides safe harbors. So, fiduciaries avoid liability for investment losses when participants direct their own accounts.

If the plan does allow participant self-direction, fiduciaries still must offer a broad range of well-managed options and must prudently select and monitor those options.

4. Follow the plan documents and instruments

The written plan document and trust agreement govern plan operations, so fiduciaries must administer the plan according to those terms.

Let’s assume the plan document names an administrator or committee as fiduciary; that procedure must be followed.

However, fiduciaries cannot use the plan to violate ERISA or other law. Any discrepancy between the plan document and ERISA rules must be resolved in favor of ERISA.

Fiduciary Roles & Responsibilities Checklist

The following checklist breaks down fiduciary responsibilities by role.

Plan-specific items vary; small plans carry fewer compliance burdens, while large plans with more than 100 participants require independent audits and additional reporting.

Table 1. Fiduciary Roles and Responsibilities

While fiduciary responsibilities define who is accountable for specific aspects of plan governance, effective compliance also depends on when those responsibilities are performed.

The following calendar provides a high-level overview of the key compliance activities typically performed throughout the plan year.

Table 2. Annual Fiduciary Compliance Calendar

Compliance Calendar (Key deadlines for a calendar-year plan)

January:    Issue Form 1099-R to distributees; begin ADP/ACP test preparation
February:   Continue testing; identify any preliminary failures
March 15:   ADP/ACP corrective distributions deadline (excess deferrals)
April:      Q1 participant statements due; review prior year 5500 status
May–June:   Independent audit fieldwork (large plans)
July:       Quarterly participant statements; review contribution deposits
July 31:    Form 5500 due (calendar-year plans; extend to October 15 if needed)
August:     Begin open enrollment planning; prepare safe harbor notice for following year
September:  SAR distribution deadline (9 months after year-end)
October 15: Form 5500 extended due date; Form 8955-SSA due
October–November: Safe harbor notice distribution (30–90 days before year-end)
November–December: Top-heavy determination; year-end deferral changes; plan amendments
December 31: Last day for certain corrections; final 5500 data reconciliation

The investment fiduciary, whether an internal investment committee, an external investment consultant, or an ERISA investment manager, carries responsibility for

• Selecting
• Monitoring, and
• When necessary, replacing the plan’s investment options.

Table 3: Investment Fiduciary Responsibilities (Selection, Monitoring & Governance)

Table 4: Recordkeeper / Third-Party Administrator (TPA) Responsibilities

References:

• Retirement plan fiduciary responsibilities (IRS)
• Fiduciary Responsibilities DOL.Gov