The upside of using credit cards abroadPlastic is more convenient. You don't have to carry as much money or change currencies as often. This is ideal for larger purchases like flights and hotels. Unlike cash, credit cards provide fraud protection.
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If you are heading abroad for your trip, you will want to avoid foreign transaction fees. Although both credit and debit cards are subject to this 2-4% upcharge, getting a credit card without a foreign transaction fee is a bit easier than finding a debit card with no foreign fees.
Foreign transaction fees are assessed by your credit card issuer and tend to be charged as a percentage of the purchase that you're making, usually around 3%. While 3% might not seem like much, the charges can add up.
Using credit cards for purchases and using ATMs to get local currency are the best options when abroad. Avoiding cash as much as possible won't saddle you with extra unspent currency when you leave a country.