What Is Your 401(k) Really Costing You?
A 401(k) can include investment expenses, plan administration, recordkeeping charges and participant-level fees. Some are easy to see. Others are built into the investments themselves.
The important question is not whether 401(k)s are expensive. It is whether your 401(k) is competitive for the investments and services you receive.
There is no single “typical” 401(k) fee.
A 2026 ICI/ISS Market Intelligence study of large private-sector 401(k) plans found significantly different average costs depending on how the data were weighted.
Source: ICI/ISS MI Defined Contribution Plan Profile, 2023. Figures reflect the study's sample of audited large private-sector 401(k) plans and should not be used as a benchmark for any specific plan.
A 401(k) can contain several layers of cost.
The U.S. Department of Labor generally groups 401(k) expenses into three categories.
Plan Administration
Recordkeeping, accounting, legal and trustee services, participant communications, online systems and other costs required to operate the plan.
These may be employer-paid, participant-paid or partially supported through investment-related fees.Investment Expenses
Fees charged by the funds or other investments inside the 401(k). These expenses generally reduce investment returns rather than appearing as a separate debit.
For mutual funds, the total expense ratio is an important number to identify.Individual Services
Certain participants may incur additional charges for services such as loans, distributions, brokerage activity or other optional plan features.
These should generally be separated from recurring annual costs.Smaller plans tend to cost more.
Plan size has historically been strongly associated with total plan cost. Fixed administrative costs can be spread across more participants and assets in a larger plan.
401(k) costs have been falling.
The data do not support the idea that all 401(k)s are inherently expensive. Across the ICI/ISS MI sample, total plan costs declined substantially between 2009 and 2023.
Source: ICI/ISS MI Defined Contribution Plan Profile, 2023.
Fund expenses inside 401(k)s have fallen too.
ICI's latest research found that participants investing in mutual funds inside 401(k)s continued to concentrate assets in relatively low-cost funds. Average expense ratios have fallen substantially since 2000.
Not every fee appears as a debit on your statement.
Direct Account Charges
- Recordkeeping fees
- Administrative fees
- Managed-account charges
- Loan or distribution fees
- Other participant services
Investment Expenses
- Investment management
- Fund administration
- Shareholder servicing
- Certain 12b-1 expenses
- Other fund operating costs
Investment expenses generally reduce the return of the investment rather than showing up as a separate withdrawal. In some arrangements, investment-related compensation may also help offset plan-level recordkeeping expenses.
This is why simply searching a statement for the word “fee” may not reveal the full economic cost.
A 1% annual fee difference can compound over time.
The U.S. Department of Labor provides the following hypothetical: $25,000 invested for 35 years, a 7% average gross return and no additional contributions.
lower ending balance in the Department of Labor's hypothetical example because of a one-percentage-point difference in fees.
Hypothetical illustration from the U.S. Department of Labor. Actual investment returns, fees, contributions and account values will vary.
How to estimate what your own 401(k) costs.
You do not need to become a retirement-plan expert. Start with the documents your plan already provides.
Gather your documents.
Find your recent statements, annual participant fee disclosure, investment comparative chart and applicable fund information.
Find direct account charges.
Look for recurring recordkeeping, administrative, participant or advisory charges deducted directly from your account.
Calculate your weighted investment expense.
Multiply each investment's expense ratio by the percentage of your account invested in it, then add the results.
Separate recurring fees from occasional fees.
Loan, distribution and other transaction charges may be important, but they should not automatically be treated as annual recurring expenses.
Avoid double counting. For example, a mutual fund's management, 12b-1 and other operating expenses may already be incorporated into its total expense ratio.
Lower fees do not automatically mean you should roll over your 401(k).
After leaving an employer, fees are only one part of the decision. Investment options, services, plan rules, liquidity needs, withdrawal provisions, tax considerations and protections can also matter.
Some employer plans offer extremely competitive institutional investments. Others may have higher administrative or investment expenses. The answer depends on the specific plan and the specific alternative being considered.
Request a 401(k) Review → Learn about your options after leaving an employer →Primary research used for this analysis.
- U.S. Department of Labor, Employee Benefits Security Administration. A Look at 401(k) Plan Fees. Used for fee categories, participant disclosures and the long-term hypothetical fee illustration.
- U.S. Department of Labor, Employee Benefits Security Administration. Understanding Retirement Plan Fees and Expenses. Used for administration, investment and individual-service fee definitions.
- Investment Company Institute and ISS Market Intelligence. The ICI/ISS MI Defined Contribution Plan Profile: A Close Look at 401(k) Plans, 2023. Published March 2026. Used for total plan costs and plan-size comparisons.
- Investment Company Institute. The Economics of Providing 401(k) Plans: Services, Fees, and Expenses, 2025. Published July 2026. Used for 401(k) mutual-fund expense data. Data include information from ICI, Lipper and Morningstar.
- U.S. Securities and Exchange Commission. Mutual Fund Fees and Expenses. Used for descriptions of mutual-fund operating expenses and 12b-1 distribution/service fees.