Last verified: September 20, 2026
Contactless card payment · Photo: European Commission / Wikimedia Commons, CC BY 4.0.
When a Korean terminal, ATM or checkout offers KRW and your home currency, choose KRW as the default. Then check that the receipt, ATM slip or booking confirmation also shows KRW.
The home-currency option is usually Dynamic Currency Conversion, or DCC. It lets the merchant's, website's or ATM operator's conversion provider set the exchange rate at checkout. A KRW transaction leaves the conversion to the card-network and issuer route under your own card agreement.
That distinction matters because the familiar-looking home-currency total is not automatically the cheaper total. The clean comparison is the amount finally posted to your account after the conversion rate, markup and issuer fees are included.
Choose KRW / Korean won / local currency on the screen → confirm KRW on the receipt, ATM slip or booking confirmation
1. Identify DCC Before You Press a Button
A DCC screen may not use the letters “DCC.” Instead, it may ask whether you want to pay in KRW or in USD, EUR, GBP, AUD, CAD or another billing currency. At an ATM, the buttons may say accept conversion, decline conversion, guaranteed rate or continue without conversion.
Visa's current consumer guidance says the offer should display the local-currency amount, cardholder-currency amount, exchange rate and any additional fee or markup. It should also give you a real choice. Mastercard's current guide likewise states that DCC must not be applied automatically and that the cardholder's choice must be honored.
| Route | Who converts | Still check |
|---|---|---|
| KRW | Network / issuer route | Issuer FX rate and foreign-transaction fees |
| Home currency via DCC | Merchant / ATM DCC provider | Displayed rate, markup and fees |
If the screen does not show enough information to compare the two routes, KRW is the safer default. Do not accept a home-currency total merely because the terminal labels it “recommended,” “guaranteed” or “no surprise.”
2. Know Your Card Costs Before the Trip
Choosing KRW removes the merchant's DCC conversion, but it does not make the transaction fee-free. Your issuer may still apply its own exchange rate, foreign-transaction fee or cross-border fee. Check those terms before departure.
For example, a card with no foreign-transaction fee and a normal network conversion route gives DCC less room to help. A card with unusually high international fees requires a real comparison. The point is to compare known costs, not to guess at the terminal.
Check the card's foreign-transaction fee · confirm overseas use is enabled · save the issuer's international contact number · carry a second card from a different account
3. At a Store, Say KRW Before the Card Is Run
At a staffed checkout, say “KRW, please” before the employee completes the transaction. If the terminal faces you, select KRW or Korean won yourself. Do not hand over your PIN, and do not let anyone choose a currency without showing you the screen.
After approval, look for the transaction currency on the receipt. A KRW purchase should show the won symbol or KRW amount as the charged currency. A separate home-currency amount printed only as information is not necessarily the transaction currency, so read the labels rather than one large number.
If the wrong currency was selected while you are still at the merchant, ask whether the first transaction can be voided and run again in KRW. Keep both receipts.
4. At an ATM, Decline Conversion Without Cancelling the Withdrawal
Decline conversion, without conversion, local currency or continue in KRW generally rejects the ATM provider's conversion while continuing the withdrawal.
Read the full screen before pressing decline. The aim is to decline the conversion, not cancel the cash withdrawal. If the wording is unclear, use another international-card ATM rather than approving an unknown rate under time pressure.
Rejecting DCC does not remove the Korean ATM operator fee, your issuer's overseas-withdrawal fee or a cash-advance cost on a credit card. Those are separate cost layers.
5. Online, Separate Display Currency From Charge Currency
A hotel, ticket or shopping site can display a reference price in your home currency while charging in KRW—or do the reverse. The currency shown during browsing is therefore not enough. Check the final payment button, card-charge currency and confirmation page.
Save a screenshot of the last payment screen and the booking confirmation. This is especially useful when a reservation includes a deposit, later balance payment, cancellation or refund, because each transaction needs a clear currency trail.
6. Treat Hotel Holds and Final Charges as Separate Transactions
A hotel may place an authorization hold at check-in and settle a final charge at checkout. Do not assume that the currency shown for one entry automatically proves the currency of the other. Compare the booking confirmation, check-in document, final folio and banking-app status.
If a hotel or rental counter offers DCC during a preauthorization, ask which currency will be used for the final settlement and refund. Currency changes between authorization, completion and refund can make the statement harder to reconcile.
7. If You Chose KRW but Were Charged Another Currency
At the merchant, request a void and a fresh KRW transaction when possible. Confirm that the first transaction was actually voided instead of merely followed by another sale.
After leaving, preserve the receipt, advertised KRW price, booking confirmation and any evidence of your selection. Contact the merchant first, then the card issuer if the currency was changed without your consent or the merchant cannot correct it. Visa specifically advises contacting the issuer when the required information was not shown or the customer was pressured toward one currency.
For a refund, keep the original transaction currency and amount. Mastercard's current guide says a DCC refund should be processed in the same currency as the original transaction; changing currencies can create a second conversion loss.
8. KRW Is a Default, Not a Promise of the Lowest Possible Cost
Your issuer may charge a foreign-transaction fee. A fully disclosed DCC offer could theoretically be cheaper for a particular card.
KRW remains the cleaner default because it avoids adding the merchant or ATM conversion provider unless you have deliberately compared both routes. The practical habit is simple: choose KRW, verify KRW, and keep the evidence until the transaction posts correctly.
Korea Dessert
Read concise explainers on Korean culture and current change.
Visit Korea Trends Explained →