Here's What It Takes to Become a 401(k) Millionaire

Good news, working Americans! There are more 401(k) millionaires than ever before.

The number of account holders with a balance of at least $1 million rose by 49,000 to 168,000 from the second quarter of 2017 to Q2 2018, according to a report from Fidelity Investments.

Jar full of hundred dollar bills
Jar full of hundred dollar bills

Image source: Getty Images

If you want to join the ranks of the 401(k) millionaires, you'll be happy to know that with some careful planning and a lot of dedication, it can be done. The bad news is that it may not be easy, especially if you're paying hefty 401(k) fees.

Understanding how fees impact your savings

All 401(k) plans have fees, yet 37% of Americans mistakenly believe they don't pay any fees at all, according to a report from TD Ameritrade. It's easy to understand why so many people don't realize they're paying fees. Your employer won't send you a bill for the fees you incur; instead, those costs are automatically deducted from your investment earnings, so you may not realize how much you're paying -- or even that you're paying them at all.

How much you pay in fees depends on your plan, but there are two general types of costs: administrative fees and investment fees. Administrative fees are the general expenses involved in the upkeep of a 401(k) plan, such as record keeping, customer support, and legal services. Investment fees, on the other hand, are what you pay for the specific investments in your plan. The expense ratio is the most common fee you'll see listed in your plan. According to research from the Investment Company Institute, the average expense ratio is roughly 0.48% -- meaning that if you have $100,000 in your 401(k), you'll pay $480 per year in fees. This number can vary, though, depending on your specific plan: If you work for a large corporation with thousands of 401(k) participants, you may pay less than you would if you worked for a small start-up with only a couple dozen employees.

Paying a fraction of a percent in fees may not sound like a lot, but as your retirement savings grow, the fees add up. For example, say you're just starting to save for retirement. You have nothing stashed away currently, but you're contributing $2,000 per year (or about $166 per month) and earning a 7% annual rate of return on your investments. In one scenario, you're paying 1% per year in fees, and in another, you're paying 2% annually. In scenario one, you'll end up paying roughly $92,456 in fees over 40 years, and in scenario two, that number jumps to $161,758. So while 1% may not seem like a big difference, it can add up to tens of thousands of dollars over the course of your career.