How a foreign card purchase picks up an extra charge
A card payment made in another currency has to be translated into the currency of the account. The card network or card issuer converts the amount, using an exchange rate that may differ slightly from the rate you see in a currency app. Some banks then add a foreign-transaction fee, usually calculated as a percentage of the purchase.
That fee is separate from the price of the item: the merchant receives payment through the card system, while the cardholder’s bank may charge for processing a transaction involving a foreign currency or payment network. The fee and its size depend on the card’s terms; many cards do not charge one.
Where the conversion happens matters
A shop or payment terminal may offer to charge your card in your home currency instead of the local one. This is called dynamic currency conversion. It can make the displayed total feel familiar, but the merchant’s conversion rate may be less favorable than the rate used by your card network. In that case, choosing your home currency can cost more—even if your bank does not add its own foreign-transaction fee.
The practical difference is that a traveler may encounter two separate costs: the bank’s fee and the exchange rate applied to the purchase. Checking the card terms before a trip, and choosing the local currency when a terminal offers a choice, helps reveal which one is affecting the final bill.
