Every 401(k) participant receives a fee disclosure notice at least once a year, and most never open it – but the real cost of a 401(k) plan is usually buried across two separate disclosures, not stated as a single number anywhere.
The Two Disclosures That Matter
Department of Labor regulation 404(a)-5 requires plan administrators to send participants plan-level and investment-level cost information at least annually and whenever fees change. A separate regulation, 408(b)(2), requires the service providers themselves (recordkeeper, advisor, third-party administrator) to disclose their compensation to the plan sponsor – the employer – not directly to employees. The 404(a)-5 notice employees actually receive is built from that underlying 408(b)(2) data.
Direct Compensation: The Fees You Can See
Direct compensation is paid explicitly – a flat recordkeeping fee, a per-participant administration fee, or an advisory fee stated as a dollar amount or percentage on quarterly statements and 404(a)-5 notices. This is the transparent half of plan costs.
Indirect Compensation: Revenue Sharing Hidden in the Expense Ratio
Indirect compensation – most commonly 12b-1 fees and sub-transfer agency (sub-TA) fees – is paid by mutual fund companies to the plan’s recordkeeper out of a fund’s own expense ratio, rather than billed to the plan or participant directly. This is the harder-to-see half: it doesn’t show up as a separate line item on a statement, it’s embedded inside the expense ratio already being deducted from investment returns.
What to Actually Compare
The expense ratio alone doesn’t tell you whether a fund’s cost is paying for genuine investment management or subsidizing plan administration through revenue sharing. Two funds tracking the same index can carry different expense ratios specifically because one pays more in revenue sharing back to the recordkeeper – meaning the “cheaper-looking” plan-level administration fee on your 404(a)-5 notice can be offset by a more expensive fund lineup elsewhere in the same plan.
A Practical Benchmark
As a rule of thumb, total all-in 401(k) costs (administration plus average fund expense ratios) above roughly 1% annually are worth scrutinizing, and above 1.5% are generally considered high for a plan of meaningful size. Someone who can’t tell their plan’s all-in cost from the disclosure alone can request a 401(k) fee comparison or benchmarking report – a service some independent providers and advisors offer specifically to translate the 408(b)(2)/404(a)-5 disclosures into a single comparable number.
Why This Compounds More Than People Expect
The gap between a low-cost index-based lineup and a revenue-sharing-heavy active lineup is often 0.3-0.5 percentage points in annual expense ratio alone – which, on a account growing for 20-30 years, can compound into tens of thousands of dollars in lost balance, the same mechanic covered in our target-date fund expense ratio guide, just applied to the whole plan lineup rather than one fund category.
The Bottom Line
Your 401(k)’s real cost is the sum of a visible administration fee and an often-invisible revenue-sharing amount embedded in fund expense ratios – read both the 404(a)-5 notice and the fund-level expense ratios together, not either one alone, before deciding a plan’s fees are reasonable.
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