401(k) Management Roles and Responsibilities
Managing a 401(k) plan involves multiple fiduciary roles, each with distinct responsibilities. Recordkeepers, Third-Party Administrators (TPAs) and fiduciary service providers (3(16), 3(21), and 3(38)) help employers comply with regulations, reduce liability, and streamline plan operations.
Recordkeeper
A Recordkeeper (Rkr) plays a crucial role in managing the administration aspects of a retirement plan. Their key responsibilities are:
- Account Management – maintaining detailed records of participant accounts
- Transaction Processing – processing contributions, withdrawals and loan repayments
- Compliance and Reporting – ensure the plan complies with ERISA and completing necessary reports and disclosures
- Participant Communication – providing participants with account statements and updates on investment performance
- Data Security – ensuring security and confidence of participant data
For specific details about the services provided by a particular recordkeeper, it is advisable to consult an advisor or recordkeeper directly.
What is a TPA?
A Third-Party Administrator (TPA) is hired by an employer to manage various administrative and compliance tasks associated with the retirement plan. Hiring a TPA adds additional guidance and support for the employer. Here are a few key functions of a TPA:
- Plan Design and Setup – prepare and update plan documents according to the sponsor’s objectives and regulatory requirements
- Compliance and Regulatory Support – ensure the plan complies with applicable laws and regulations, prepares Form 5500, and conducts annual non-discrimination testing
- Participant Management – provide support for participant transactions and eligibility tracking
- Does not act as a fiduciary unless explicitly contracted through 3(16) Fiduciary services discussed below
TPAs are essential in maintaining the efficient operation and compliance of the retirement plan, collaborating with the employer, recordkeeper, and financial advisor to ensure seamless plan management.
Understanding Fiduciary Roles
Managing a 401(k) plan requires individuals to act in the best interest of the employees, known as fiduciaries. Plan sponsors hold fiduciary responsibilities for setting up and maintaining the retirement plan, and they can engage external fiduciaries to delegate certain duties and mitigate associated risks. Fiduciary responsibilities are categorized into different levels: 3(16), 3(21), and 3(38).
3(16) – Plan Administrator
A 3(16) Plan Fiduciary handles the administrative management of the plan, ensuring compliance and communication with participants. This includes:
- Plan Administration – oversee the day-to-day operations to ensure running efficiently
- Document Preparation and Maintenance – prepare and sign plan documents and amendments
- Participant Communication – distributing notices and disclosures, tracking eligibility and providing required materials to newly eligible
- Transaction Oversight – monitor and approve participant transactions, such as contributions, loans, and distributions
- Fiduciary Coverage – reduces fiduciary burden and mitigates compliance risks to the employer
Certain 3(16) providers may offer various service models that can be integrated into the plan.
3(21) – Investment Advisor
A 3(21) fiduciary provides investment recommendations and guidance to the plan sponsor or committee. Key duties:
- Shared Responsibility – the plan sponsor retains ultimate decision authority for the investment choices
- Advice Based – offers advice about investment choices, but co-fiduciary coverage
- Employer Advisor – help employers with their annual plan review meeting and making informed decisions to ensure adhering to regulatory requirements and industry best practices
- Employee Advisor – educational support for enrollment and retirement savings
The 3(21) fiduciary share liability for the advice given but are not solely responsible for investment decisions.
3(38) – Investment Manager
A 3(38) fiduciary takes full discretionary authority to manage and make decisions regarding the plan investments. They:
- Independent Decision Making – independently selects, monitors and adjust investments in the plan
- Full Responsibility – assumes full fiduciary responsibility for the investment decisions, relieving the plan sponsor of the liability related to investment management
- Employer Advisor – help employers with their annual plan review meeting and making informed decisions to ensure adhering to regulatory requirements and industry best practices
- Employee Advisor – educational support for enrollment, investment advice and retirement planning education
This shifts the investment responsibility from the employer to a licensed expert.

Additional Resource: Retirement plan fiduciary responsibilities | Internal Revenue Service