Currency conversion costs: the hidden fee when buying ETFs in another currency
Buy a USD-listed ETF from a euro account and your broker quietly converts your euros first — at a rate that is never quite the one on Google. That markup, typically 0.25% to 1%, is often the single largest cost of the entire transaction, dwarfing both the order commission and a year of TER. It's also one of the easiest costs to avoid entirely.
Where the FX fee hides
Brokers rarely present currency conversion as a fee. Instead they apply a markup to the interbank exchange rate — convert €10,000 at 0.5% over mid-market and €50 disappears without ever appearing as a line item. Some brokers charge it per trade (converting on every buy and sell), others let you hold multi-currency balances and convert once.
The trap doubles on the way out: sell the USD-listed fund and convert back, and you pay the markup twice. A 0.5% markup each way is a 1% round trip — equivalent to five to ten years of TER on a cheap core fund.
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The good news: you usually don't need FX at all
Trading currency and fund currency are not the same thing. An MSCI World UCITS ETF whose fund currency is USD typically has a EUR-quoted listing on Xetra or Euronext — buy that listing with euros and no conversion happens at your broker, with zero effect on your investment outcome: your return is driven by the underlying assets, not the currency the shares happen to be quoted in.
So the checklist is short: prefer a EUR-quoted listing of the fund you want (same ISIN, different exchange, identical holdings); if you must trade a USD or GBP listing, compare your broker's FX markup first — they range from 0.02% to 1% across the brokers in our reviews — and if you regularly need foreign currency, use a broker with cheap explicit FX conversion and convert deliberately in one step rather than per trade.
Key takeaway
Check the trading currency before you buy: choosing the EUR-quoted listing of the same fund usually eliminates FX fees entirely. If you must convert, know your broker's markup — the spread between the best (0.02%) and worst (1%) is a bigger cost difference than any commission.
This article is educational content, not investment advice. Capital is at risk; past performance does not predict future returns.