When the Card Terminal Asks "Pay in USD?", the Right Answer Is Always Korean Won

At a cosmetics shop in Seoul's Myeongdong district, a foreign tourist paying by credit card saw the payment terminal ask, "Would you like to pay in USD?" Drawn to the familiar home currency, tapping "yes" without a second thought meant paying more than if the purchase had been charged in Korean won.

Extra charge: choosing automatic home-currency payment (DCC) adds 3-8% (including a 1-2% currency-conversion fee); paying in the local currency, Korean won, adds only about a 1% international card-network fee. Contact: Financial Supervisory Service consumer hotline 1332, or the card issuer's customer service.

Korea's Financial Supervisory Service calls this practice of converting a card charge into the customer's home currency instead of the local currency "overseas won payment," or DCC (Dynamic Currency Conversion). It lets shoppers see the amount in a familiar currency before paying, but a currency-conversion fee plus an exchange-rate margin the merchant sets on its own, plus a payment-processing fee, together push the real added cost to roughly 3-8%.

The gap adds up fast. On a 100,000-won purchase, choosing DCC adds 3,000 to 8,000 won. For a hotel night in the 200,000-won range or duty-free shopping around 500,000 won, the extra cost climbs to 15,000-40,000 won. The larger the bill, and the more volatile the exchange rate at the time, the bigger the loss.

According to the Financial Supervisory Service, as of 2021 only 1.3% of the 96.1 million Korean-issued cards usable overseas - 1.2 million cards - had signed up for the "overseas won-payment blocking service" that automatically stops unwanted DCC charges. In other words, most cardholders were paying the extra fee without even knowing they had another option. The same logic works in reverse for tourists paying in Korea: when a terminal asks whether to charge in USD, EUR, JPY, CNY or another home currency, declining the offer and choosing KRW, the local currency, is what avoids the extra cost.

Before paying, check whether the terminal screen or receipt shows "KRW." If it is unclear, simply ask the clerk, "Charge in Korean won, please." The exchange rate may look unfamiliar at first glance, but paying in won is cheaper every time. If a charge went through as DCC without consent, or a receipt does not clearly show the fees applied, travelers can contact the Financial Supervisory Service hotline (1332) or the Credit Finance Association of Korea's consumer center to request a correction or refund.