Dynamic Currency Conversion (DCC) review: never worth it

Somewhere on your next trip, a card machine will ask a question that sounds like a courtesy: would you like to pay in your home currency instead of the local one? It's called dynamic currency conversion, and it is not a courtesy — it's an on-the-spot exchange performed at a marked-up rate, with the margin flowing to the merchant's side of the transaction rather than to you. Your own card network converts at rates that are almost invariably better. This isn't a contested claim; consumer protection bodies and the card networks themselves have said as much publicly for years.

The trap works because the framing inverts the truth. 'Pay in your own currency' sounds like the prudent choice — a known number, no surprises — while the local-currency option feels like a leap. In reality the 'known number' is known precisely because the unfavorable conversion has already been baked into it, and the 'uncertain' local amount resolves through your bank at a better rate. ATMs run the same play with higher stakes, sometimes styling the decline option — 'without conversion' — to look like a mistake. It isn't. It's the correct button.

So the rule travels light: local currency, every time, at every terminal, ATM, and online checkout that offers the choice — and if a machine converts without clearly asking, you're generally entitled to ask the merchant to void and rerun the charge. Note what this rule doesn't cover: your own bank's foreign transaction fees are a separate matter between you and your bank, worth checking in your account terms before a trip. DCC is simpler than all of that. It's the one travel-money question with no 'it depends': decline it, always.