Benchmarking is a duty, not a shopping trip
ERISA requires plan fiduciaries to ensure that only reasonable fees are paid from plan assets. Reasonable is a relative word, and the only way to establish it is by comparison against plans of similar size and service scope — documented, dated, and kept. That is benchmarking. Its output is not a cheaper invoice; it is evidence that you tested the price and reached a defensible conclusion.
Every dollar the plan pays, in one place
Fees hide in four layers, and sponsors usually see only the first.
| Layer | Typical form | Where to find it |
|---|---|---|
| Administration / recordkeeping | Base fee plus per-participant charge | 408(b)(2) disclosure; service agreement |
| Investment expense | Expense ratio inside each fund | Fund fact sheets; participant 404a-5 notice |
| Advisory | Percentage of assets or flat retainer | Advisor's disclosure |
| Event and transaction fees | Loans, distributions, QDROs, force-outs | Fee schedule appendix — the page people skip |
What "similar" has to mean
A comparison is only useful against plans that match on the dimensions that actually drive cost:
- Participant count — the primary cost driver, far more than asset size
- Total assets — because so much pricing is still asset-based
- Average balance — many small balances cost more to service than few large ones
- Service scope — a plan buying 3(16) administration and signature authority is not comparable to one buying recordkeeping alone
- Plan features — loans, safe harbor, profit sharing and payroll integrations all add real work
Benchmarks pulled from Form 5500 filings are the most defensible source available, because they are the plans' own reported numbers rather than a vendor's marketing average. Schedule C and Schedule H show what comparable plans actually paid.
Cadence: how often, and what triggers an off-cycle review
Review annually and run a full benchmarking study every three years at minimum. Run one immediately if any of these happen:
- Participant count moves more than about 20%
- Assets grow substantially under an asset-based fee
- Your provider is acquired, or changes its fee schedule
- Service quality drops — slow distributions, missed testing deadlines, unanswered tickets
- You add or drop a major feature such as a safe harbor match or auto-enrollment
The documentation that makes it count
An undocumented benchmarking exercise legally never happened. The file should contain the date, the data source, the comparison group and why it was chosen, the fee summary in dollars, the committee's conclusion in plain language, and any action taken — including a decision to make no change, which is perfectly valid when the reasoning is recorded. Minutes signed and stored. Ten minutes of writing protects the entire review.
Cheapest is not the standard
ERISA asks whether fees are reasonable for the services received, not whether they are the lowest available. A plan paying more for a provider that accepts the 3(16) plan administrator role, approves distributions and signs the Form 5500 is buying a genuinely different product than one paying less for software and a call center. Price the service scope, not just the invoice — and see what the 402(a) named fiduciary role moves off your desk.
Frequently asked
Can the plan pay for the benchmarking study? Generally yes, when it is a settlor-neutral administrative expense tied to fiduciary duties. Document the determination.
Do we have to change providers if we are above average? No. You have to be able to explain why the fee is reasonable for what you receive.
Is a provider's own benchmarking report enough? It is a data point, not an independent review. Fiduciaries should not rely solely on a study produced by the party being evaluated.
Retirement plan benchmarking is broader than 401(k) fees
Retirement plan benchmarking covers every plan type a sponsor runs — 401(k), 403(b), defined benefit, cash balance and non-qualified arrangements. The duty is the same in each: prove the fees and services are reasonable for a plan of your size. What changes is the comparison set. A 120-life 401(k) is measured against 401(k) plans in its asset band; a cash balance plan is measured against actuarial and administration pricing for similar funded designs. Benchmarking a plan against the wrong peer group is worse than not benchmarking, because the file now documents a conclusion you cannot defend.
How often are you required to benchmark?
ERISA sets no calendar. Courts and DOL investigators look for a regular, documented process, and the practice that holds up is a full study every three years with an annual interim review at the committee meeting. Four events should trigger a study regardless of where you are in that cycle:
- A material change in plan assets or headcount — roughly 25% or more in either direction.
- Any change in service scope, recordkeeper, advisor or fee structure.
- A new 408(b)(2) disclosure showing fees you were not expecting.
- A participant complaint, DOL inquiry or audit finding touching fees.
The fee benchmarking requirement people ask about is really the 408(b)(2) and 404a-5 disclosure regime plus the general duty of prudence. Disclosure is the provider's job. Reading it, testing it and keeping the evidence is yours — or ours, if we hold the ERISA plan administrator appointment.
Not sure who is actually on the hook at your company?
Admin316 serves as the ERISA 3(16) plan administrator and 402(a) named fiduciary, which means we sign the Form 5500 and carry the administrative fiduciary duty instead of your owner or HR lead.
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