401k fees come in layers, and most participants never see the full picture. The expense ratios on your funds are the most visible cost — but administration fees, record-keeping fees, and advisory fees compound on top of them, often without any clear disclosure on your statement.
The Three Fee Categories
Investment expenses — the expense ratio baked into each fund — are the largest cost for most participants. An actively managed fund might charge 0.8–1.2% annually. A comparable index fund might charge 0.03–0.10%. Over decades, that difference is enormous.
Plan administration fees cover record-keeping, compliance, and participant services. These are often charged as a flat dollar amount per participant or as a percentage of assets. In smaller plans, these fees can be substantial.
Individual service fees are charged when you take a loan, request a hardship withdrawal, or get investment advisory services. These are disclosed in your plan documents but rarely surfaced prominently.
What To Do About It
Request your plan's 404(a)(5) fee disclosure — plans are legally required to provide this annually. Compare your funds' expense ratios against low-cost index alternatives. If your plan's investment menu is expensive and limited, a rollover to an IRA often opens access to significantly cheaper options.