401(k)s have become immensely important retirement savings vehicles for thousands of Americans.

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The 401(k) plans have long been considered efficient retirement savings tools. In fact, many financial experts believe that consistently investing in a tax-advantaged account like a 401(k) plan is one of the easiest ways to become a millionaire and retire comfortably. But fees can take a serious chunk off your returns. So it’s important to understand what these fees are and how they work.
The Department of Labor breaks down 401(k) fees into three main categories: