Dynamic Currency Conversion in Korea 2026: Always Decline 'Pay in KRW'
Bottom line: When a Korean card terminal asks "Pay in KRW?", tap No. With a foreign-issued card, you want the charge billed in your home currency, not converted to Korean won on the spot.
If you didn't know: Choosing "Pay in KRW" triggers Dynamic Currency Conversion (DCC), which adds a 3-8% markup on top of the exchange rate. On a 100,000-won purchase, that's an extra 3,000-8,000 won you didn't need to pay. If you're swiping a card several times a day on a trip, that adds up to tens of thousands of won within days.
DCC markup 3-8% (varies by card issuer) · Loss on a 100,000-won payment: 3,000-8,000 won · At the terminal, choose "Local currency" / decline "Pay in KRW" · Doesn't affect domestic Korean cards — this is about foreign-issued cards used in Korea · Reference example: KB Kookmin Card's DCC-blocking guide at kbthink.com/life/card/dcc-block.html
KB Kookmin Card's official guide (kbthink.com/life/card/dcc-block.html) states that Dynamic Currency Conversion (DCC) adds a 3-8% markup on top of standard overseas-use fees, and that DCC can be blocked through the "Overseas Use Service" menu in the KB Pay app. That guide is written for Korean cardholders spending abroad, but the underlying mechanism — the terminal letting you pick the billing currency — works the same regardless of direction (a foreign card used in Korea). This article could not find primary-source documentation of a Korean merchant case specifically involving foreign cards during this check, so that part is stated as an assumption. The fee range and blocking steps were confirmed on the kbthink.com page on 2026-11-07.
By nationality: The logic holds no matter where your card was issued — when the terminal asks which currency to bill, pick your card's home currency (USD, JPY, CNY, VND, IDR, etc.) to avoid the DCC markup. Some terminals don't even offer a currency choice, so it's safer to tell the cashier "no, local currency please" before you tap your card.
Journey stage: During the trip · Verified 2026-11-07
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