Travelling With Currency: Cards, Cash and Fees

Currency costs are one of the easier travel expenses to reduce, because most of the loss comes from two avoidable decisions rather than from unavoidable spreads.
Dynamic currency conversion
When a foreign card machine or ATM offers to charge you in your home currency, it is offering to convert at its own rate rather than the card network's.
That rate is consistently worse, sometimes substantially. The offer is framed helpfully — you see the amount in familiar currency — and it costs money every time.
Always choose to be charged in the local currency. Your card issuer will convert at a wholesale-based rate that is almost always better.
This applies at card terminals, ATMs and increasingly on airline and hotel websites.
Airport exchange bureaux
The worst rates available anywhere, because they serve a captive audience with no alternative. The spread between buy and sell rates is wide and commission may apply on top.
If you need cash on arrival, withdrawing from a bank ATM at the destination is almost always better.
Cards worth having
Specialist travel cards and app-based accounts typically charge no foreign transaction fee and convert near the interbank rate.
Check whether the favourable rate applies at weekends, since some providers apply a markup when markets are closed.
Check ATM withdrawal limits and whether free withdrawals are capped monthly.
Standard credit and debit cards frequently charge a foreign transaction fee of around three percent, which on a fortnight's spending is a meaningful sum.
How much cash to carry
Varies enormously by destination. Some countries are effectively cashless; others rely on cash for taxis, markets and small businesses.
Research the destination rather than assuming. Carrying too much cash creates theft risk; carrying none creates practical problems in cash economies.
Split cash between locations rather than keeping it all in one place, and keep a small emergency reserve separate from your daily money.
Practical precautions
Tell your card providers you are travelling, or use apps that let you flag travel, to reduce the chance of blocks. Many providers no longer require this but some still do.
Carry at least two cards from different networks, stored separately. Some destinations accept one network far more widely than another.
Note the international number for reporting lost cards and store it separately from your wallet.
Check whether your card requires a PIN for contactless above certain amounts abroad, and know it.
ATM specifics
Use machines attached to actual banks rather than standalone units in tourist areas, which frequently charge higher fees and are more likely to be tampered with.
Decline the conversion offer, as above. Take fewer larger withdrawals rather than many small ones where a fixed fee applies, and the reverse where a percentage applies.
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