Fees are a reduction in return, not a bill
This is the part that makes plan costs counterintuitive. A fee is not a one-time charge against the balance — it is a permanent reduction in the rate at which the account compounds. The gap between two fee levels therefore widens every single year, and it widens fastest at the end, when the balances are largest.
That is why a difference that sounds trivial in year one — half a percent — turns into a materially different retirement outcome across thirty years. The employee never sees a line item. They simply end up with less, and no statement ever tells them why.
Where the costs actually sit
Total plan cost is rarely one number in one place. It is usually assembled from several layers, some of which are disclosed clearly and some of which are netted out of investment returns before anyone sees them.
- →Recordkeeping and administration — often a per-participant charge, sometimes a percentage of assets.
- →Investment expense ratios — charged inside each fund, netted out of returns, never itemized on a statement.
- →Revenue sharing — payments from funds back to the recordkeeper, which can make the visible administrative fee look lower than the plan's real cost.
- →Advisory and consulting fees — for investment selection, committee support, and participant education.
- →Individual service fees — loans, distributions, and QDRO processing.
Why per-participant costs fall as a plan grows
Much of the work of running a plan is fixed. The compliance testing, the Form 5500, the audit, the document maintenance — these cost roughly the same whether the plan holds ten million dollars or a hundred million.
The practical consequence is that a plan's cost ratio should decline as assets grow. When a plan's expense ratio stays flat year over year while its assets climb, participants are paying more in absolute dollars for the same service. That is one of the most common and least-noticed findings in a plan fee review, and it is a reasonable thing to raise at renewal.
What "reasonable" means legally
ERISA does not require a plan to be cheap. It requires fiduciaries to ensure that fees are reasonable relative to the services actually received, and to be able to demonstrate the process by which they reached that conclusion.
That distinction matters. A higher-cost plan with strong participant outcomes, real advisory support, and documented benchmarking can be entirely defensible. A low-cost plan that nobody ever reviewed can still be a fiduciary problem. What regulators and plaintiffs' attorneys look for is the absence of a process, not the presence of a particular number.
- →Benchmark total plan cost against genuinely comparable plans — similar asset size, similar participant count, ideally similar industry.
- →Document the comparison and the committee's reasoning in meeting minutes.
- →Revisit periodically, and always after significant asset growth.
- →Request fee disclosures in writing from every provider, including indirect compensation.
How to read your own plan's numbers
Every plan with 100 or more participants files a Form 5500 with the Department of Labor, and those filings are public. Schedule H reports total administrative expenses and total assets — the ratio between them is the starting point for any fee conversation. Schedule C discloses every service provider paid more than five thousand dollars, along with the compensation formula in the plan's own filed words.
Comparing that ratio against plans of a similar size is what turns a number into a finding. A plan paying well above the median for its size is not necessarily doing anything wrong, but it is a question the committee should be able to answer.