You may have spent months saving up for your summer holiday, so don't waste your hard-earned cash on foreign ATM fees and transaction rip-offs.
Which? rounds up some of the most common ways you risk losing money when using your debit or credit cards overseas.
In popular holiday destinations, especially in Europe, you'll often be given the option of converting to pounds when withdrawing from a cash machine or paying on card.
But it's usually best to turn this down and choose to pay in the local currency instead. If you opt to convert, the ATM or card terminal provider will set its own exchange rate - often significantly worse than the one offered by your own bank or card provider.
In one recent case Which? has seen, an ATM in Greece charged a whopping £200 to withdraw 200 euros at an exchange rate of just 1.0144. By contrast, the pound-to-euro Mastercard exchange rate on that day was 1.126, meaning the same transaction could have yielded 25 euros more.
To add insult to injury, the ATM also charged a £2.95 card fee.
Be wary, as the wording on the ATM display is often confusing, and you may be prompted several times to accept the currency conversion.
If you're using your debit card to withdraw cash overseas, you'll generally be charged a foreign exchange fee, which is often between 2.75% and 2.99%.
Many providers will also charge either a 2% withdrawal fee or minimum charge, whichever is higher, every time you use the card. And some will add on a flat fee for each transaction.
As an example, for every transaction on your TSB, Lloyds Bank or Bank of Scotland debit card, you'll be charged a 2.99% foreign exchange fee, an additional £1 as a flat fee and a 1.5% withdrawal charge (at a minimum of £2 and maximum of £4.50).
To avoid being stung with fees on each transaction, consider making a single large withdrawal and paying in cash.
As an example, two £50 purchases and three £50 cash withdrawals on a Santander card would net you fees of £15.35. If you withdrew £250 as a lump sum, you'd pay £11.25 instead.
Just make sure you keep the money in a secure place. It may be sensible to carry a small amount in your wallet and keep the rest in the hotel safe.
There are a number of providers on the market that offer fee-free transactions.
You could also opt for a prepaid card. , for example, allows you to transact in different currencies and spend, transfer and exchange up to £5,000 a month fee-free. You can also make overseas cash withdrawals of up to £200 a month.
But wherever possible, you should avoid withdrawing cash on your credit card. As soon as you make the withdrawal, you'll start incurring interest, and usually at a higher rate - even if you pay the balance off in full during your usual billing period.
These transactions may also impact your credit score, especially if you rack up a large number of withdrawals in a short time.
If you're making a large purchase, you'll have extra protection if you pay on card. This can be especially important if it's a service you're paying for in advance, such as flights or a hotel booking.
Debit cards don't fall under the legislation, but many major card providers - including Visa and Mastercard - are part of the . This offers a similar level of protection, although rules vary from provider to provider.
Fraud is a worldwide problem, and whether you're at home or abroad, it's worth remaining alert.
When using a cash machine, look for signs of tampering, like a wobbly or bulky part that doesn't belong on the machine. Action Fraud has warned that fraudsters have been known to insert card skimmers that steal your details, or devices to trap your card, into otherwise functioning ATMs.
Take a look around you to see whether anyone is standing close to you and cover your pin with your hand.
It's also important not to let your payment card out of your sight. For example, if you're in a restaurant and the waiter or waitress wants to take your card to the till to make the transaction, go with them.