Expense Ratio Drag

An expense ratio is the annual fee a fund charges, expressed as a percentage of the money you have invested. It is deducted automatically from the fund's returns, so you never see a separate bill - which is exactly why it is easy to overlook. A fund with a 1 percent expense ratio quietly takes 1 percent of your invested balance every year, whether the fund goes up or down.

Because the fee is charged every year on your whole balance, it does not just reduce this year's return - it also removes money that would have compounded for decades. Over a long horizon, the difference between a low-cost and a high-cost fund can add up to a large share of your final balance. This is why many investors prioritise low expense ratios: it is one of the few costs you can control with certainty.

Broad, passively managed index funds often charge very little - sometimes a small fraction of a percent - while actively managed funds typically charge more. There is no single threshold, but the lower the fee, the more of the market's return you keep. Since low-cost funds have historically been hard for higher-cost funds to beat after fees, cost is a sensible thing to minimise where a comparable cheaper option exists.

Generally no. Decades of evidence show that higher fees do not reliably buy higher returns, and after costs many expensive funds underperform cheap index funds. Occasionally a manager justifies the cost, but it is the exception. Treat a high expense ratio as a hurdle the fund must clear every year just to match a cheaper alternative.