What is a third-party administrator (TPA) for a 401(k)?

What employers should know about TPAs

Managing a 401(k) plan involves multiple moving parts, from regulatory filings to participant communications. A third-party administrator (TPA) helps employers handle these tasks accurately and on time.

A TPA specializes in plan administration and compliance support, helping your organization meet requirements under the Employee Retirement Income Security Act of 1974 (ERISA). Some TPAs partner with payroll or recordkeeping providers, while others work independently to complete testing and annual filings.

As a Retirement Industry Disruptor™, Human Interest offers a modern, technology-driven platform with built-in compliance tools that help small and midsized businesses reduce manual work and maintain alignment with IRS and DOL rules.

Discover how we bring simplicity to your organization’s retirement plan. 

Common responsibilities of third-party administrators for 401(k)s

TPAs handle a range of administrative and regulatory duties that keep a 401(k) plan compliant and efficient. 

Common tasks include:

• Preparing and updating plan documents
• Generating quarterly employee statements
• Performing annual nondiscrimination testing (NDT)
• Coordinating Form 5500 filings for the IRS and DOL
• Processing participant distributions or loans

A reliable TPA communicates regularly about deadlines, new regulations, and testing results to help employers stay compliant throughout the year.

How to choose the right TPA for your business

Selecting a TPA can influence how efficiently your 401(k) plan operates and stays compliant over time. When evaluating TPAs, consider your organization’s plan size, service expectations, and compliance needs. 

Useful questions include:

• What services are included in their fee structure?
• Do they specialize in plans like yours (for example, fewer than 100 participants)?
• Do their staff hold professional credentials such as QPA, QKA, or ASPPA designations?
• Are fees billed per participant, per service, or bundled into an annual cost?

Small and midsized employers often benefit from TPAs familiar with smaller plans. These specialists can anticipate your operational needs and offer high-touch assistance that complements limited internal HR resources. Partnering with a retirement solution like Human Interest can unify your administrative and recordkeeping tasks together through a connected platform that supports ongoing compliance.

401(k) TPAs vs. recordkeepers and advisors: What’s the difference?

While TPAs handle plan compliance and administrative functions, a 401(k) recordkeeper focuses on maintaining participant account data by tracking investments, contributions, and balances. 

Even if your 401(k) has a TPA in place, you could also benefit from engaging a financial advisor who provides fiduciary investment guidance. Depending on the arrangement, they may act as:

• A 3(21) co-fiduciary: Advises on fund selection while you retain control.
• A 3(38) fiduciary: Manages investments on your behalf.

Financial advisors can also provide educational resources and guidance for employees, such as hosting sessions or sharing materials about investment fundamentals. Together, these roles help ensure your plan’s administrative and investment components work cohesively and meet fiduciary standards.

Why your 401(k) TPA relationship matters

An effective 401(k) TPA acts as an extension of your team, helping prevent costly errors and maintain accurate records. Strong communication and proactive guidance can make a measurable difference in how your plan performs administratively.

When assessing your current TPA, consider questions like:

• Are the fees competitive and benchmarked regularly against similar providers?
• How accurate and timely are their reports, filings, and testing?
• Do they respond quickly and clearly to plan questions or updates?
• Does your TPA partner leverage modern platforms to help reduce manual work and keep your plan running efficiently?

If your business is growing or your plan is evolving, it may be time to evaluate whether your current TPA can continue meeting your needs.

How Human Interest supports plan administration

Human Interest integrates administrative oversight and recordkeeping into a single platform designed for small and midsized employers. Our approach includes automated compliance tools, payroll syncing, and predictable pricing that makes 401(k) management easier and more consistent.

Learn how Human Interest can help your business simplify retirement plan administration.

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Frequently asked questions about TPAs

What does a third-party administrator do for a 401(k)?

A TPA handles plan setup, document maintenance, and compliance tasks like annual filings and nondiscrimination testing.

Do all 401(k) plans need a TPA?

Most plans require administrative oversight. Some recordkeepers include TPA services, while others work with independent administrators.

Can one company serve as both recordkeeper and TPA for a 401(k)?

Yes. Bundled solutions can simplify communication and reduce vendor management—Human Interest offers both recordkeeping and administrative support through an integrated platform.

How does Human Interest’s approach to administration differ from traditional TPAs?

Human Interest combines plan administration and recordkeeping within one connected platform, reducing manual steps and helping employers stay aligned with regulatory requirements. Our modern retirement solutions help streamline setup, testing, and filings so plan management feels more coordinated from day one.