Expense Ratios Are Charged Daily, Not Billed Yearly

A fund's expense ratio is quoted as an annual figure, which suggests a yearly bill. The money is actually removed in tiny daily amounts from the fund's own assets, so no bill exists.

How the deduction actually happens

Each business day, a fund calculates the value of everything it holds, subtracts what it owes and divides by the shares outstanding. That produces the net asset value per share.

Accrued expenses are part of what it owes. A portion of the annual management fee and other operating costs is recognized every day and subtracted before the per-share value is published.

By the time a shareholder sees a price, the charge has already been applied. The published value is net of fees, which is why no separate deduction appears anywhere.

Why this makes the cost invisible

Costs that arrive as a bill get compared, resented and occasionally canceled. Costs embedded in a price get absorbed into whatever the market did that day.

The daily amount is also small enough to be lost in ordinary movement. A single day's expense accrual is far smaller than the day's typical price fluctuation.

Nothing about this is improper, and the rate is disclosed in fund documents. The point is that disclosure and salience are different things, and only one of them changes behavior.

What the ratio does and does not include

The expense ratio covers the fund's ongoing operating costs: management, administration, custody, accounting, legal work and, where they exist, distribution fees.

It does not include the costs a fund incurs when it trades its own holdings. Brokerage commissions and the spreads paid on portfolio transactions reduce returns without entering the ratio.

Nor does it include what an investor pays to buy or sell shares of the fund. Brokerage charges, spreads on an exchange-traded fund and any sales charge sit outside it entirely.

Accrual timing explains some odd behavior

Because expenses accrue daily, holding period matters. Someone who holds for a month pays roughly a month's worth, not a year's, regardless of what the annual figure suggests.

Fees are also charged on assets rather than on gains. A fund that loses value still accrues its expenses, calculated on whatever the assets are worth each day.

That base effect works both ways. As a fund grows, the dollar amount collected grows with it even if the stated rate never changes.

Where to see the effect if it is invisible in practice

The clearest evidence is comparative. Two funds tracking the same index diverge slowly, and the direction of the divergence is set largely by the difference in what they charge.

Fund reports also state expenses in dollar terms for a hypothetical account, which converts a rate into a figure that can be weighed against something familiar.

The mechanism is why a small difference in the ratio matters more than it seems. It applies to the whole balance, every day, for as long as the position is held.