There is one question a terminal or an ATM abroad asks at the moment of payment, most people answer wrong, and over a holiday it can cost more than every other fee combined.
The question is roughly: "Would you like to be charged in your home currency?"
The answer is almost always no.
What dynamic currency conversion is
When you pay abroad with a card issued at home, the amount has to be converted from the local currency into your account currency at some point. There are two places where that can happen:
- At your bank or card scheme. The card network's rate applies, plus your bank's fee. That rate sits close to the market.
- At the merchant or the ATM owner, on the spot. This is dynamic currency conversion, and the rate is set by whoever owns the terminal.
The second option is sold as a convenience — "pay in a currency you understand, know the exact amount". It sounds helpful. It is a product whose price is hidden inside the exchange rate.
What it costs
The gap between the card network's rate and the rate offered by the terminal usually runs to several percent. On one dinner that is negligible. Over a ten-day trip with a few thousand euros of spending, it becomes the difference between two holidays.
What makes it slippery is that the cost never appears as a fee. The receipt does not say "commission" — it shows a tidy amount in your own currency, and that is the whole trick.
The rule that always holds
When you are offered a choice of currency, choose the local one.
- In Germany — euros.
- In Turkey — lira.
- In Hungary — forint.
- In Czechia — koruna.
Leave the conversion to your own bank. It is not free, but as a rule it is significantly cheaper than conversion at the counter.
ATMs work the same way
When you withdraw cash abroad, the ATM offers the same choice, often with wording implying that your home currency is safer or better value. It is not. Choose the local currency.
There is also a separate ATM operator fee for the withdrawal itself, which has nothing to do with conversion. It is shown on screen before you confirm, and there is little to do about it except withdraw less often and in larger amounts.
What to bring, and what not to
For the eurozone the simplest approach is some cash in euros bought at home at a rate you chose yourself, and card payments in the local currency for the rest.
For countries outside the eurozone — Turkey, Hungary, Czechia, Poland — buying the local currency in advance at home is usually a poor deal. Spreads on less-traded currencies are wide outside their home market. Better to carry euros and change on arrival, or simply pay by card in the local currency.
Checking after the trip
When you get back, compare the amount on your statement against the reference rate for that date. A gap much larger than your bank's usual fee is the sign that dynamic currency conversion was applied somewhere — and a useful thing to remember for next time.
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Frequently asked questions
How an exchange rate is actually set, what a spread costs on a real transaction, what happens when your income and your debt are in different currencies, and what to check before paying or being paid abroad. They explain mechanisms rather than forecast rates, and each one carries the date it was last revised at the top.
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