What are 401(k) hidden fees and how do I find them?
Retirement
Most 401(k) participants pay between 0.5% and 1.5% in combined plan and fund fees, often without realizing it. Over a 30-year career, the difference between a 0.5% and a 1.5% all-in cost can mean six figures in lost retirement wealth.
Where the fees actually live
Three layers: investment expense ratios (the funds), administrative fees (recordkeeping, custody), and individual service fees (loans, distributions). The first two are the silent killers.
The 408(b)(2) disclosure your employer must provide
Federal law requires plans to disclose all fees annually. The disclosure is dense and often ignored. Ask your HR or benefits team for the most recent version.
What 'reasonable' looks like in 2026
Plans under $5M AUM: under 1.0% all-in is competitive. Plans $5M-$50M: under 0.7%. Plans over $50M: under 0.5%. Anything above these is a red flag worth raising with your plan sponsor.
What people often get wrong
- Assuming the 401(k) is 'free' because nothing shows up on a paycheck
- Picking funds by name recognition instead of expense ratio
- Ignoring revenue sharing where part of fund fees subsidize plan admin
What to think about next
- Request your 408(b)(2) disclosure from HR.
- Map every fund you own to its expense ratio.
- If the all-in cost is above 1%, raise it with your plan sponsor or HR.
When to consider working with a CFP®
Working with a CFP® can help when these decisions feel intertwined, taxes, investments, cash flow, and life goals tend to move together, and a planning relationship can offer structure, prioritization, and accountability over time.
Frequently Asked Questions
What if I'm a small business owner running the plan?
You're a fiduciary. Document your fee benchmarking annually. We compare providers in our 2026 401(k) provider guide.
Talk to a CFP® who works with high earners.
Connect with a CFP® to help you navigate this decision and build a comprehensive financial strategy.
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