The practice is called dynamic currency conversion, or DCC. It appears at card terminals, at ATMs, and at online checkouts. The offer is always some version of the same thing:
Pay in EUR 85.00 or Pay in USD 96.30
Choose your currency. Rate guaranteed.
Choosing your home currency feels safer. You know exactly what you are being charged, in units you understand, with no uncertainty about what your bank will do later. That is the entire appeal, and it is why the practice works.
What is actually happening
When you accept DCC, the conversion is performed at the point of sale by the merchant's payment processor rather than by your card network. That processor sets its own exchange rate, and the markup it applies is not disclosed to you in any meaningful way. Industry practice puts DCC markups commonly in the range of three to seven percent above the mid-market rate, and it can run higher.
When you decline and pay in local currency, the transaction is passed to your card network — Visa, Mastercard, Amex — which converts at its own wholesale rate. Network rates sit very close to mid-market. Your own card issuer may then add a foreign transaction fee on top, typically a low single-digit percentage, and zero on cards marketed for travel.
| Route | Converted by | Typical margin | Who benefits |
|---|---|---|---|
| Accept DCC (pay in home currency) | Merchant's processor | 3–7%+ | Processor and merchant, who often share it |
| Decline DCC (pay in local currency) | Your card network | ~0% + your issuer's FX fee | You |
Note the last column. The merchant is frequently paid a share of the DCC margin, which is why staff sometimes encourage you to accept, and why some terminals are configured to make the home-currency option the visually obvious one.
Where you will meet it
Card terminals in shops and restaurants
The prompt appears after you insert or tap. Sometimes the terminal is handed to you already showing the choice; sometimes staff press a button before you see anything. If you are only shown a total in your home currency and never offered the local one, DCC has been applied on your behalf.
ATMs
The most aggressive implementation. The machine will often present its offer as a favour — "with conversion" versus "without conversion" — and will sometimes display a large, confident-looking rate alongside a warning that declining means your bank sets the rate. Decline anyway. "Without conversion" is the one you want. Note that ATM DCC is separate from, and in addition to, any operator fee the machine charges for the withdrawal itself.
Online checkouts
An international retailer may offer to bill you in your home currency. Same mechanics, same markup. If the site displays prices in local currency and offers a converted total at the final step, the converted total is usually the DCC path.
Hotels and car hire
Particularly worth watching, because the amounts are larger and the charge often happens at checkout when you are in a hurry. Some properties apply DCC to the whole stay. Ask to be billed in the local currency when you check in, and check the folio before you sign.
How to decline it, in practice
- Always choose the local currency — the currency of the country you are physically in. If you are in Japan, choose yen. If you are in Portugal, choose euro.
- Read the buttons carefully. The wording is deliberately unhelpful: "Pay in GBP" versus "Pay in EUR", or "With conversion" versus "Without conversion". The local currency, or "without conversion", is correct.
- Say it out loud at the counter. "Please charge me in euros" before the transaction starts saves the awkward part.
- Check the receipt. If it shows an exchange rate, a conversion notice, or your home currency, DCC was applied.
- If it happened anyway, ask for a reversal and re-run. Merchants can void and redo the transaction. Under card network rules, DCC must be a genuine, informed choice by the cardholder — being charged in your home currency without being offered the local option is not permitted, and that is worth stating politely.
If your card issuer charges a very high foreign transaction fee, and a particular DCC offer happens to be quoted at a smaller markup, accepting could theoretically cost less. In practice this is rare and difficult to verify at the counter. The reliable rule remains: choose local currency, and if your issuer's foreign transaction fees are high enough for the question to be interesting, change cards rather than accept DCC.
The bigger lever: your card
Declining DCC removes the largest markup. The remaining cost is your own issuer's foreign transaction fee, and that is a matter of which card you carry. Before a trip, check three things on each card in your wallet:
- The foreign transaction fee. Many travel-oriented cards charge nothing.
- The cash withdrawal terms abroad — whether ATM withdrawals are treated as cash advances, and what that triggers.
- Whether the issuer converts at the network rate or applies its own additional spread.
A no-foreign-fee card plus a consistent habit of declining DCC gets you close to the mid-market rate on everything you spend abroad, which is about as good as retail currency gets.
The short version
- DCC lets the merchant's processor convert instead of your card network, at a much worse rate.
- Always choose the currency of the country you are standing in.
- ATMs: "without conversion" is the right answer, every time.
- Check receipts. Ask for a re-run if it was applied without being offered.
- Carry a card with no foreign transaction fee and the remaining cost is close to nothing.
Know the rate before you travel Check the mid-market rate for your destination so you can recognise a bad offer when a terminal shows you one.
Check a rate