Fees: the small number that changes everything
How a 1% annual fee compounds into a much bigger difference over twenty years.
Why 1% is not 1%
If a fund charges 1% a year, instinct says you lose one percent. For one year, yes. Over twenty years, no — because every euro taken this year is a euro that never earns anything again.
The fee does not just take the money, it takes all of that money's future growth too. So the effect is not linear; it widens with time, exactly like compounding, only in reverse.
That is why fees are the one thing in investing you fully control and whose impact is guaranteed. You do not get to choose your returns. You do get to choose your fees.
The fees you cannot see
The fund's expense ratio is the one that gets advertised, but it is rarely the only one. There are platform fees, transaction costs inside the fund itself, and currency conversion costs if you buy something in another currency.
The conversion cost is the one most often forgotten, and on some platforms it is bigger than all the others combined. A 0.5% margin on the way in and 0.5% on the way out is a full percent taken straight out of your pocket.
When you compare two products, add everything up. The only number that matters is what you keep, not what gets advertised.
When paying more is worth it
The lowest fee does not always win. A cheap fund that tracks its index badly can cost you more than a slightly pricier fund that tracks it precisely.
In difficult or small markets, where buying and selling is expensive, a skilled manager can justify the fee. In big, liquid indexes, history shows they rarely do.
A practical rule: the more standard the thing you are buying, the less you should agree to pay for it.
Twenty years with €10,000, assuming 7% a year
| Fund | Annual fee | Value after 20 years |
|---|---|---|
| Cheap index ETF | 0.10% | €37,900 |
| Average fund | 0.75% | €33,500 |
| Expensive active fund | 1.50% | €29,000 |
Key terms in this lesson
- Expense ratio
- The fund's annual fee, given as a percentage of what you hold.
- Tracking error
- How far a fund has drifted from the index it promised to follow.
- FX spread
- The hidden cost of converting currency when you buy something priced in another one.
Quick check
Two funds track the same index. One charges 0.10%, the other 1.50%. What should you expect over twenty years?
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