What are 401(k) fees and how much do they cost you?

401(k) plans charge expense ratios (built into the funds you choose, typically 0.03%–1.5% annually), plan administration fees (sometimes deducted from your account), and in some cases individual service fees. A difference of 1% per year in fees can reduce your ending balance by 28% over 35 years, according to DOL illustrations. Check your plan's fee disclosure — it's legally required.

Every 401(k) plan has fees. The Department of Labor (DOL) requires that plan participants receive fee disclosures and that plan documents identify all charges. There are three main categories of fees — understanding them is the first step to minimizing their drag on your balance.

1. Investment fees (expense ratios)

Expense ratios are charged by the mutual fund or ETF inside your 401(k) — they are deducted from fund assets daily rather than showing up as a line item. They're expressed as a percentage of assets annually:

Index funds / passive ETFs: 0.03%–0.20% — the lowest-cost category. A target-date index fund might charge 0.10%–0.15%.
Actively managed funds: 0.5%–1.5%+ — higher because a team of analysts actively selects holdings.
Stable value / money market funds: 0.3%–0.8% typically.
Annuity wrappers: Can be 1%–2%+ — sometimes embedded in older 401(k) plans.

2. Plan administration fees

The recordkeeper, trustee, and plan administrator charge fees to operate the plan infrastructure — statements, compliance filings, participant services. These may be charged to the employer, or partially passed through to participants. The DOL's 408(b)(2) regulation requires service providers to disclose fees to plan sponsors. Ask your HR department how much (if any) of these fees are passed to participant accounts.

3. Individual service fees

Loan origination fee: $50–$100 if you take a 401(k) loan.
Loan maintenance fee: $25–$50/year while a loan is outstanding.
QDRO processing fee: $300–$800+ for domestic relations orders during divorce.
Distribution fee: Some older plans charge a small fee for processing a distribution.

The long-run cost of high expense ratios

Fee drag illustration

The DOL illustrates this: on a $25,000 balance over 35 years at 7% growth, paying 0.5% in fees results in an ending balance of ~$227,000. Paying 1.5% in fees results in ~$163,000 — a difference of $64,000 from 1 extra percentage point of annual fees. Minimize expense ratios wherever possible by choosing low-cost index options in your plan lineup.

Check your plan's 404a-5 participant fee disclosure

ERISA Section 404a-5 requires your plan to send you an annual fee disclosure listing all investment options and their expense ratios. If you haven't reviewed yours recently, ask HR for the most recent disclosure or look in your plan portal. If your plan only offers high-cost actively managed funds with no index options, that's worth flagging to your HR department.

DOL and ERISA sources

The DOL's ERISA Section 404a-5 requires 401(k) plans to provide participants with quarterly benefit statements and annual disclosure of all investment options and fees. — DOL — EBSA Retirement Plan Fee Disclosure
The DOL illustrates that a 1% difference in annual fees can reduce a retirement account's ending balance by approximately 28% over a 35-year period. — DOL — Understanding Retirement Plan Fees and Expenses

Key takeaways

Expense ratios (0.03%–1.5%) are the biggest fee — they compound silently over decades.
A 1% annual fee difference can cut your ending balance by ~28% over 35 years, per DOL data.
Choose index funds within your plan's lineup wherever available — they carry the lowest expense ratios.
Review your 404a-5 annual fee disclosure to see every investment option's cost.
Individual service fees (loans, QDROs) are one-time — expense ratios are the long-run drag to focus on.

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