Most people have never looked at the fees inside their 401(k). Not because they are careless, but because no one ever told them to — and the financial services industry has not made it easy to find.
The result is that millions of American workers are quietly losing thousands of dollars over their working years to fees they did not know they were paying.
This is one of the most consistent eye-openers for students inside BudgetDog Academy. When Brennan Schlagbaum — licensed CPA, founder of BudgetDog, and someone who built a seven-figure net worth by his early 30s — walks students through their retirement portfolio for the first time, the reaction is almost always the same: disbelief followed by urgency.
Here is what you need to know, and exactly what to do about it.
What 401(k) Fees Actually Are
There are three primary types of fees that can exist inside a 401(k):
1. Expense ratios — This is the annual cost of owning a fund, expressed as a percentage of your assets. If you own a fund with a 1.00% expense ratio and you have $100,000 invested, you are paying $1,000 per year in fees — automatically, whether the fund gains or loses money. A fund with a 0.05% expense ratio costs $50 per year on the same balance. That gap is not trivial over a 30-year career.
2. Administrative fees — These are plan-level fees charged by the company managing the 401(k) on behalf of your employer. They can be flat fees, asset-based fees, or both. They are often disclosed but rarely explained clearly.
3. Individual service fees — Fees for specific transactions or services, such as taking a loan from your 401(k) or getting investment advice through the plan.
Of these three, expense ratios are both the most impactful and the least understood. They are also the one category where you have the most direct control.
How to Find the Fees in Your Plan
Here is a step-by-step process to audit your own 401(k) for fees:
Step 1: Log into your 401(k) account portal.
Most plans are accessible through providers like Fidelity, Vanguard, Schwab, Empower, or similar platforms. If you are not sure who holds your plan, check with your HR department.
Step 2: Find the fund lineup.
Navigate to your investment options or your current holdings. You are looking for the list of funds you are invested in, or that are available to you.
Step 3: Look up the expense ratio for each fund.
This should be listed directly in your account portal, but if it is not, search the fund name plus “expense ratio” or look up the fund’s ticker symbol on Morningstar.com. The expense ratio will be expressed as a percentage (e.g., 0.75% or 0.04%).
Step 4: Check for target-date funds specifically.
Target-date funds — often labeled something like “Target 2055 Fund” — are the default enrollment option in many plans. They are not inherently bad, but they tend to carry higher expense ratios than comparable index funds. A target-date fund at 0.70% versus an S&P 500 index fund at 0.03% is a significant difference at scale.
Step 5: Review your plan’s 404(a)(5) disclosure.
Federal regulations require 401(k) plan administrators to send participants an annual fee disclosure. It is usually delivered by mail or email and may look like a dense document most people throw away. That document contains the total plan costs and individual fund fees. Find it, read it.
Step 6: Compare your current funds to available alternatives.
Most 401(k) plans offer at least a few low-cost index fund options. If your plan holds a mix of high-cost actively managed funds and low-cost index funds, you may be able to rebalance your allocations toward the lower-cost options without changing your employer or your contribution amount.
Why This Matters: The Compounding Math
A 1% annual fee difference does not sound significant. But compounded over 30 years on a growing account balance, the impact is substantial.
Assume two investors both contribute $500 per month and earn a 7% annual return. One pays 0.05% in fees. The other pays 1.00%. Over 30 years, the investor paying the higher fee will end up with roughly 20% less in their account — not because they invested less, but because fees compounded against them the same way returns compounded for them.
On a $500,000 portfolio, that difference is six figures. On a $1,000,000 portfolio, it is more. This is not a theoretical exercise. It is the math that plays out for millions of workers who never looked at their expense ratios.
What to Do With What You Find
If you discover your 401(k) is loaded with high-expense funds, here is your action plan:
– Identify the lowest-cost options in your plan. Most plans include at least one broad market index fund with a low expense ratio. Common options include S&P 500 index funds, total market funds, or bond index funds.
– Reallocate your existing balance. Log into your account and change the investment allocation for your current balance to the lower-cost alternatives.
– Update your contribution elections. Separately, update where your future contributions will be directed. These are often two distinct settings in the platform.
– Review once per year. Plans change their fund lineups. Check your expense ratios annually to make sure nothing has shifted without your knowledge.
– If your plan has no good options, contribute enough to get the employer match, then prioritize an IRA. Employer matches are free money you should never leave on the table. But if every fund in your plan carries high fees, a Roth or Traditional IRA with a low-cost provider gives you access to better options for contributions above the match threshold.
The Bottom Line
Your 401(k) fee structure is not something you have to accept passively. Understanding what you own, what it costs, and whether lower-cost alternatives exist is one of the highest-return financial actions available to most working adults — and it takes less than an hour to do for the first time.
This is the kind of work that happens inside Budgetdog Academy. Not theory. Not generic advice. Actual portfolio audits, actual fund comparisons, and a framework that helps students understand not just what to change but why — so they can make confident decisions for the rest of their investing lives.