When investors compare mutual funds, they usually start with the expense ratio. That makes sense. The expense ratio tells you how much a fund charges each year for management and operating expenses. All else equal, lower costs are better because every dollar paid in fees is a dollar that cannot compound for you.
But the expense ratio does not always tell the full story.
Some fund costs sit outside the headline fee. They may not appear as a separate line item on your statement, but they can still show up in performance. One of the most important examples is the cost of trading inside the fund.
When a mutual fund manager buys or sells securities, the fund may incur transaction costs. Some are explicit, such as brokerage commissions. Others are harder to see, such as bid-ask spreads and market impact.
The bid-ask spread is the gap between what buyers are willing to pay and what sellers are willing to accept. If a fund buys at the higher ask price and sells at the lower bid price, that gap becomes a real cost to the fund.
Market impact can also matter. Large mutual funds may need to trade hundreds of thousands, or even millions, of shares. A large buy order can push prices higher. A large sell order can push prices lower. In both cases, the fund may receive a worse price because of the size of its own trade.
Over time, this can add up.
Researchers have differed in their attempts to quantify the impact of mutual fund trading costs. One study estimated that these costs could average as much as 1.44% per year for the domestic equity funds studied. Others have argued that figure may be too high, with John Bogle, the founder of Vanguard, using a more conservative estimate of 0.50% per year for active mutual fund transaction costs.
Even the lower end of that range can have a major long-term impact. A 0.50% annual cost drag may not sound like much, but on a $100,000 investment earning a 7% gross annual return over 30 years, it could reduce the ending value by nearly $100,000.
This does not mean every mutual fund is bad, or that every actively managed strategy should be avoided. Some strategies require more trading, and some managers may justify the added cost.
But it does mean investors should ask a better question: not just, “What does this fund charge?” but “What does this fund really cost me to own?”
That means looking at the expense ratio, but also turnover, trading activity, tax efficiency, and whether the strategy has a realistic chance of adding value after all costs.
At Hanover Advisors, we believe investors should understand not only what they own, but why they own it, what it costs, and how it fits into their broader financial plan.
Because in investing, it is not just about what you earn. It is about what you keep.