Korea has been a card-first country for over a decade, by policy — the government nudged businesses to accept cards as part of the post-1997 financial reforms, then made tax-deductible card spending a consumer benefit. The practical result: you can pay for a ₩2,000 (US$1.50) coffee with a credit card without anyone raising an eyebrow.
Where your card definitely works
Visa and Mastercard are accepted at virtually every restaurant, café, hotel, convenience store, department store, museum and chain storein Korea. Amex coverage is good in Seoul and the larger tourist sites; spotty in smaller cities. Discover and JCB — mostly accepted because they pair with UnionPay or Mastercard rails — will work at most chains too.
Public transit is its own world. The subway, buses and many taxis use T-money cards, which you load with cash or a Korean card. Most foreign credit cards can’t top up T-money; you load the card once with cash at any convenience store, then ride contactless for the duration of your trip.
Where you genuinely still need cash
Three places, in order of how often you’ll hit them:
1. Traditional markets (재래시장).Gwangjang Market, Namdaemun, Tongin Market, Bupyeong — stalls inside these are usually cash-only or accept Korean Kakao Pay only. You’ll want about ₩30,000–₩50,000 in pocket cash for a market food crawl.
2. Some small restaurants and street food. Family-run banchan shops, very small drinking spots (포차), and street-food stalls outside Seoul will sometimes be cash-only. The food is often the best in the country, so this is the cash that earns its keep.
3. The occasional taxi.Officially every Korean taxi accepts cards in 2026, and almost all do. But once a trip you may flag down an older driver whose terminal “isn’t working.” ₩20,000 covers most taxi fares within Seoul.
How to get won, cheaply
The cheapest path is a foreign-fee-free debit card(Charles Schwab Investor Checking, Wise, Revolut, Monzo) at any Korean bank ATM that displays a Visa or Mastercard logo. Cirrus and PLUS are ubiquitous on the major banks (KB, Shinhan, Woori, Hana). The Korean side typically charges around ₩3,500 per withdrawal regardless of amount, so take out ₩300,000–₩500,000 at a time rather than ₩50,000 five times.
Avoid airport currency-exchange counterswhen you can — the spread is roughly 4–6% worse than ATM withdrawal. They’re fine for a small starter amount of ₩30,000–₩50,000 if you want to skip the ATM hunt on arrival, but don’t change your whole budget there.
The DCC trap (and how to dodge it)
When you pay with a foreign card, Korean terminals will sometimes display a screen offering you a choice: “Pay USD $42.30 or KRW ₩57,000?” Always choose KRW, every single time.
This is called Dynamic Currency Conversion (DCC), and the “helpful” conversion is set by the merchant’s acquiring bank at a markup that’s usually 3–7% worse than the rate your home card would have used on its own. It looks convenient because you see the dollar amount upfront. It is quietly costing you 5%.
Korean cashiers don’t always tap through the prompt; sometimes the terminal defaults to USD if you don’t intervene. If you see a non-KRW amount on the receipt, you can ask them to void and re-run in KRW. Most will, without complaint.
One unusual thing: the 10,000-won note
Korea’s mid-range bills run ₩1,000, ₩5,000, ₩10,000 and ₩50,000. ATMs in 2026 still default to dispensing ₩50,000 notes, which most small merchants and street-food stalls genuinely can’t break. When you withdraw, look for the “mixed denomination” option (보통 / 혼합) on the ATM screen, or break a ₩50,000 at a convenience store the moment you have one.
Frequently asked questions
Can I use my foreign credit card everywhere in Korea?
Almost. Visa and Mastercard work at virtually every restaurant, café, hotel, convenience store and large shop in Korea — Korea is one of the most card-saturated countries in the world. The genuine exceptions are traditional markets, some street-food stalls, smaller temple-stay venues outside cities, and a handful of taxis (mostly fixed in 2026 but still occasional).
Do I need to carry cash in Korea?
Carry roughly ₩50,000–₩100,000 per traveler for a week-long trip — enough for traditional markets, the rare cash-only restaurant and small tips at hotels you actually want to leave one at. You won't need more than that unless you're doing rural travel.
What's the cheapest way to get Korean won?
Withdraw from a Korean ATM with a no-foreign-fee debit card (Charles Schwab, Wise, Revolut). The Korean side typically charges around ₩3,500 per withdrawal regardless of amount, so take out larger amounts less often. Currency exchange counters at the airport are convenient but cost roughly 4–6% in spread.
Will I be charged in won or my home currency?
Always pick won (KRW). Card terminals will sometimes ask 'pay in USD or KRW?' This is dynamic currency conversion, and the rate is set by the merchant's bank, not yours — typically 3–7% worse than your card's network rate. Choosing KRW lets your home card handle the conversion at near-interbank rates.