All, thank you for the plethora of notes, sharing of experiences and knowledge! This is great!
Yesterday, my husband and I separately purchased train tickets to/from Lisbon to Porto. We're still States-side. We were doing it at exactly the same time. I was going to purchase two tickets on his behalf (i.e., under the same CP account but I was having trouble for whatever reason so I asked him to create his own account and we purchased together at the same time). I used my Apple Card (a mastercard) and he used his Wells Fargo (I think it's a master, but I forget). We both selected purchase in Euros (rather than USD) and interesting the amount came to be just a little different. Not a big deal, but I thought it was interesting. I ended up being charged something like $55.50 and his was charged $54.90. For some reason, I thought it would be exactly the same, but I guess it's because different banks use slightly different conversion rates?
A few of you pointed out this kind of conversion at terminals is called DCC so I looked that up on the internet and American Express has some really interesting things to say about DCC. They do agree that buying in local currency makes sense most of the time (and probably for travel forum folks it's going to make sense 100% of the time). But they do list a few scenarios where DCC might be more agreeable. Here's the link and I'll paste some choice quotes below. https://www.americanexpress.com/en-us/credit-cards/credit-intel/should-you-pay-in-local-or-home-currency-when-traveling/#:~:text=Depending%20on%20the%20credit%20card,nearly%20always%20save%20you%20money.
In practical terms, you will almost always pay more to use DCCs, and in some cases you might pay as much as double the basic currency exchange fee for a foreign transaction. Because the fee is hidden within the overall price, it’s often unclear what exchange rate is being used for the conversion. [...]
Why would anyone choose to use dynamic currency conversion? Simply put, it is a value-added service. The ability to view transactions in your country’s currency is typically easier to understand. What’s more, you view the converted price at the exact moment you make the purchase.
DCCs also deliver locked-in prices. As a result, it might make sense in situations where currency fluctuations are extreme or when complete price transparency is required, such as for business expense reporting purposes.
However, most of the time there are other less costly ways to negotiate foreign currency conversions when traveling. One of the simplest methods is to use a currency converter app on your smartphone – or look up the exchange rate – and determine the real cost using the calculator on your phone. This also makes it possible to view any potential added fees that have been inserted into a transaction, especially if it’s a DCC transaction.
Keep in mind that the best credit cards for international travel don’t impose foreign transaction fees. If you use one of these cards and avoid DCCs by selecting the local currency payment option, you will usually come out ahead.
So if I were to translate what AmEx says (and I can be totally wrong in this) might be this:
- DCC results in you knowing exactly the price you will be paying in your own currency (e.g., USD), but in order to display the exact amount, it first has to lock in the conversion rate, and in doing so it likely won't choose the most favourable conversion rate because the company(ies) are using that opportunity to essentially charge you a fee to show you USD amounts.