What is an Expense Ratio?

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Whether you are managing your investments by yourself or getting help, you need to understand one critical concept, the expense ratio of your investments. Every mutual fund and exchange-traded fund (ETF) that you invest in has an expense ratio, and keeping it as low as possible is key to your long-term financial success.

What is an expense ratio? An expense ratio is the percentage of a fund’s assets that is used for expenses. In other words, if you invest in a mutual fund with a 1% expense ratio and that fund makes 10% in 2020, you’ll only get a 9% return on your investment because 1% goes to pay expenses. The less of your return you use to pay expenses, the more you get to keep.

What is an average expense ratio? An average stock mutual fund has an expense ratio of 0.6% in 2019, but the expense ratios for mutual funds that are similar in their composition can vary wildly. For example, if you look at a list of Standard & Poor 500 index funds offered by investment companies, you’d find expense ratios as low as 0.04% (like the TSP C Fund) and as high as 2.43% (ticker RYSYX). While 2.39% does not seem like that large of a difference, keep in mind that costs last forever and that small differences compounded over years will cost you a lot of money.

Let’s pretend that when you are 25 years old your grandparents give you $10,000 to invest in an S&P 500 index fund for 50 years, during which you earn a 9.5% return. If you invested in an average mutual fund with a 0.6% expense ratio, you would have $683K. If you invested in the Vanguard index fund (another low cost S&P 500 index fund like the TSP C Fund) with a 0.05% expense ratio, you would have $902K. That 0.55% difference in the expense ratios cost you $219K! Small differences in expenses can make huge differences in long-term investment returns, so you need to pay attention to the expense ratios of your investments.

This difference is even more dramatic when you compare actively managed funds to passively managed index funds. Because actively managed funds have higher expense ratios than index funds, it is very difficult for an active manager to beat his/her comparative index over the long-term. This is why I invest 100% in index funds.

When you are picking your investments, keep in mind that you can’t control what happens to the market, but you can control which investments you choose and the expenses that they charge. Any time you are looking to invest in a mutual fund or ETF, you should search for similar funds and compare expense ratios, which you should try to keep below 0.5% (or even 0.25% if possible). Make sure that at a minimum you take a look at the Vanguard version of the investment you are considering since their expense ratios are among the lowest in the industry and they never charge extraneous fees, like loads. There is no reason to pay more expenses for what is essentially the same investment product. It could cost you A TON of money over the long-term.

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