Card fees abroad: the three charges nobody separates

This is less a set of instructions about spending money abroad than an argument, and it is worth saying so at the start.

Dynamic currency conversion is the expensive one

When a terminal offers to charge you in your home currency, it applies its own exchange rate, which is reliably worse than your card issuer's. The offer is framed as certainty and is in practice a markup, frequently several per cent.

The correct answer is always to be charged in the local currency and let your card do the conversion. This applies to card machines, ATMs and online checkouts equally.

Foreign transaction fees are your bank's charge

Many cards add a percentage on every transaction in another currency, typically a small but consistent figure. Cards without this fee exist in most markets and are the single easiest saving available to a frequent traveller. The fee is separate from the exchange rate, so a card can have a good rate and still be expensive.

The same percentage is frequently charged on refunds, so returning something bought abroad can cost you the fee twice while the exchange rate moves underneath both transactions.

ATM charges come from two places

The machine operator may charge a fee, disclosed on screen before you confirm, and your own bank may charge another. Withdrawing larger amounts less often reduces the fixed component; carrying more cash raises a different risk. Bank-operated machines generally charge less than independent ones in tourist areas, which are often the worst option available.

At the airport, a machine offering to guarantee the rate or bill you at home is running the same conversion markup as a shop terminal, and the option to decline it is usually the smaller and greyer of the two buttons.

Judge everything against the interbank rate

The interbank or mid-market rate is the benchmark; any consumer rate will be worse, and the question is by how much. Comparing a bureau, a card and an ATM against that single number makes them directly comparable.

At the airport, rates quoted with no commission are frequently worse than rates quoted with one. Card issuers apply their rate when the transaction settles rather than when you tap, so a small gap between the figure you saw and the one on the statement is ordinary rather than evidence of a hidden charge.

Cash still matters, unevenly

Card acceptance varies enormously between and within countries, and rural areas, markets and transport often remain cash-only. Carrying a modest amount of local currency on arrival removes a common first-hour problem. Airport exchange desks are the most expensive place to obtain it, so a small ATM withdrawal on arrival is usually better.

Where a currency cannot readily be bought outside the country, or where taking it in or out is restricted, the arrival machine is the only sensible plan and a second working card matters more than usual.

Check the current rules for your route before you rely on any of this.

Practical redundancy

Two cards from different networks, stored separately, covers the common failures: blocked card, lost wallet, network not accepted. Telling your bank you are travelling is less necessary than it was but still prevents some blocks.

On a long trip, a card that is not linked to your main balance limits the damage if details are compromised. Some issuers block on the first foreign transaction whatever you told them, so making one small purchase early — while the other card is still in your pocket and you have a connection — is a better test than finding out at an unattended ticket machine.

The takeaway

Always local currency, never yours. Everything else is a smaller number.

Pack for the trip you are actually taking, not the one in the photographs.