DCC Currency Conversion Fee in Korea: What It Costs and How to Decline It at the Register

Bottom line: When paying by card in Korea, if a terminal or kiosk screen asks "Pay in your home currency (USD, JPY, CNY, etc.)?", stop right there. Always choose "No, charge me in local currency (Korean Won / KRW)." If you've already paid and the receipt shows both a won amount and a foreign-currency amount side by side, ask the cashier on the spot to cancel the transaction and run it again in won.

If you didn't know: According to a consumer advisory issued by Korea's Financial Supervisory Service (FSS) on July 29, 2025, choosing this foreign-currency billing — called DCC, or Dynamic Currency Conversion — adds roughly an extra 3 to 8 percent on top of the purchase price. On a 100,000-won purchase, that is an extra 3,000 to 8,000 won. Over a five-day trip with several card payments a day, those small overcharges add up to tens of thousands of won lost to pressing the wrong button on a payment screen.

DCC lets a merchant's card terminal convert your bill into your card's home currency instead of the local currency, at the moment of payment. Under the hood, the merchant or its DCC provider first converts at its own exchange rate, and then your card issuer converts that amount again back into its own currency — a double conversion that stacks fees on fees. Korean regulators consider this arrangement bad enough for consumers that, since July 2018, Korean cardholders have been able to pre-block DCC entirely for their own overseas spending. Because this runs on the same card networks — Visa and Mastercard — the same fee structure works in reverse just as easily: swipe a foreign card at a Korean convenience store or department store checkout, and the exact same currency-choice prompt can appear on screen. Cashiers often just tap through whatever option is already highlighted, so it is up to you to say "local currency, please" before the transaction goes through.

For travelers from Japan and the United States, Visa, Mastercard and JCB cards issued at home can trigger this same DCC prompt at Korean terminals, so the advice above applies directly. Chinese travelers who pay mostly through Alipay, WeChat Pay or UnionPay are largely unaffected, since those payment networks show the yuan amount converted at the current exchange rate rather than running a DCC-style conversion. However, a Chinese-issued card that also carries a Visa or Mastercard logo can still trigger the same DCC screen.

This article summarizes official guidance and is not legal, medical, or financial advice.

Journey stage: During the trip · Verified 2026-10-25 · Source Financial Supervisory Service