The same fund, at 0.85% and at 2.81%.

01What an expense ratio actually is

It is the annual cost the fund deducts from its own net asset value: management, custody, audit and administration. No invoice ever arrives and nothing is charged to your account — it comes out of the price you see each day, which is exactly why most people never notice paying it.

It is also known as the ongoing charges figure, or TER. Whatever the label, it is a percentage of the amount invested, charged every year, whether the fund goes up or down.

What the figure does not include is worth knowing: the performance fee where there is one, the fund's own trading costs when it buys and sells, and any entry or exit charges. It is the fixed annual cost, and it is revealing enough on its own.

02What funds really charge, measured

We collected the published ongoing charges for 332 funds registered in Spain, taken from each fund's own prospectus in September 2026. Not an estimate, not a computed number: the figure the fund itself publishes.

The median is 1.23% a year. Split by type, which is where it gets interesting: equity funds run at 1.69%, Spanish equity at 1.81%, mixed at 1.53%, fixed income at 0.66% and index trackers at 0.16%.

The extremes of the set: the most expensive charges 3.26% a year, the cheapest 0.06%. Fifty-three of the 332 are above 2% and sixty-two are below 0.5%. Between the median Spanish equity fund and the median tracker there is eleven times the annual cost.

03The part almost nobody checks: the share class

A fund does not have one price, it has several. Same portfolio, same manager, same daily net asset value — but the fund is divided into share classes, and each one pays a different fee depending on where you buy it and how much you invest. Three real cases from the set:

• Global equity fund, large Spanish manager: standard class 2.81%, plus class 2.11%, premium 1.38%, clean class 0.85%.
• US equity fund, another manager: standard 2.02%, portfolio class 0.88%.
• European equity fund, independent manager: retail class M 1.81%, class P 1.31%, class E 0.56%.

In all three, the class you get by default at the counter is the most expensive one of its own fund. The same money, the same portfolio and the same manager cost more than three times in one class than in another.

And it is not three cherry-picked funds. Across the wider set reviewed, 412 funds have at least two classes whose fees differ by more than double. In the international ones the gap gets extreme: an institutional class at 0.02% against the retail class of the same fund at 2.47%.

04What it takes over time

Because ongoing charges are deducted from the net asset value rather than billed, the only way to feel them is to put them in years.

Deducting 2.05% a year for ten years takes 18.7% of the capital. Deducting 0.18% takes 1.8%. That is pure arithmetic assuming no return at all: it is simply what the fee removes for being there. On the Spanish equity median of 1.81%, it is sixteen and a half euros out of every hundred over a decade.

None of which makes an expensive fund a bad fund: it may earn enough to justify the cost, and that is a separate argument each investor has to have with themselves. What is not arguable is knowing how much you pay — and that figure is rarely printed next to the price you check.

05Four things to take away

• The median fund in Spain charges 1.23% a year, and 1.81% if it is Spanish equity. The trackers in the same set charge 0.16%.
• The same fund has several prices. The counter class is usually the most expensive of all its own classes.
• Compare by class and ISIN, not by fund name. Two rows with the same name can cost three times as much.
• The fee is invisible because it is already deducted from the net asset value. Putting it in years is the only way to see it.