How Payments Work in Korea: Cards, Cash, and Mobile Pay

The News: Tap-to-Pay Transit Expands for iPhone Visitors

If you’re flying into Seoul with only an iPhone in your pocket, you can now ride the subway, hop a bus, or catch a taxi without ever picking up a Korean transit card. Since April 2026, Mastercard, Apple, and MobileTmoney have offered an expanded setup that lets international visitors add a Mastercard to Apple Wallet, load a MobileTmoney balance onto it, and tap an iPhone or Apple Watch at the turnstile — the same tap you’d use to buy coffee back home, except this tap reads as a transit fare.

That closed a real gap. Before this rolled out, a first-time visitor’s very first errand in Korea was often a hunt for a physical T-money card before they could even leave the airport station.

A few weeks earlier, on March 17, 2026, Seoul solved a related but different problem. The city upgraded 440 ticket machines across 273 stations on subway lines 1 through 8 so travelers could feed an overseas-issued Visa, Mastercard, or other international card — or Kakao Pay or Naver Pay — straight into the machine for a single-ride ticket or a Climate Card pass, at an average service fee of about 3.7% on the foreign-card transaction.

Analysis: New Yorkers will recognize the shape of this, if not the exact mechanics. MTA’s OMNY system lets you tap your own contactless bank card directly at the turnstile — no MetroCard required, no machine in between. Seoul’s March upgrade gets most of the way there but stops one step short: you still queue at a ticket machine to run your card and get a ticket or Climate Card credit, rather than tapping your own card straight at the gate the way OMNY riders do. Between the two 2026 rollouts, though, a US visitor to Seoul now has three ways to clear a turnstile without a Korean-issued card in hand — a machine plus your own card, a phone with Apple Pay, or a T-money card bought with cash.

T-money: Korea’s Universal Transit and Micro-Payment Card

Before either of those 2026 upgrades existed, there was T-money — and it’s still the default for most visitors, because it works with zero setup. A physical T-money card costs 3,000 to 5,000 won, or roughly $2 to $4, and it’s sold at the counter of basically any GS25, CU, or 7-Eleven, as well as at machines and counters in every subway station. You can reload it with cash up to a maximum balance of 500,000 won, and it works not just on subways, buses, and taxis but at vending machines and plenty of convenience-store checkouts too.

The base fare for a single Seoul subway ride is 1,550 won — a little over a dollar — covering the first 10 kilometers, a rate that’s been in place since Seoul’s June 2025 fare adjustment and is still current as of mid-2026.

Analysis: For Bay Area readers, T-money is basically Korea’s Clipper card, minimum culture shock included — buy it, load it, tap it, done. The real difference is scope: Clipper is transit-only across BART and Muni, while T-money doubles as a general-purpose micro-payment card that also buys a bag of chips at a convenience store or pays a taxi driver. One caveat worth knowing before you rely on it for a full trip: refunding any T-money balance over 50,000 won can only be done in person at T-money Town inside Seoul Station, so it’s worth spending the balance down rather than loading up right before you fly home.

Buying and Reloading T-money With a US-Issued Card

Because GS25, CU, and 7-Eleven are ordinary Korean merchants, they’re bound by the same rule every other card-accepting business in Korea follows: they can’t refuse a valid credit card payment, US-issued or not. So picking up or reloading a T-money card at the register with a US Visa or Mastercard works the same as any other purchase there.

Practical: That guarantee applies at the staffed counter, not necessarily at the standalone reload machines inside stations, which tend to be cash-first — so it’s worth keeping a little cash on hand specifically for those, or just reloading at a convenience-store counter instead. If you’ve already added a Mastercard to Apple Wallet through the MobileTmoney setup, you can skip the physical card entirely and top up the balance from your phone.

Why Almost Every Business in Korea Takes Cards

This isn’t custom — it’s law. Under Article 19 of Korea’s Specialized Credit Finance Business Act, any merchant that accepts credit cards at all cannot refuse a valid card payment or treat a card-paying customer worse than a cash-paying one. Violating it carries a penalty of up to one year in prison or a fine of up to 10 million won, roughly $7,500. That’s a meaningfully sharper deterrent than anything in US consumer law, where a shop posting a card minimum or a cash-only sign is routine and perfectly legal.

Practical: “Accepts cards” doesn’t automatically mean every network. Visa and Mastercard are close to universal in Korea, but Discover and American Express are not — some smaller Korean merchants and independent restaurants don’t carry them. Bring a Visa or Mastercard as your primary card, and don’t count on Amex or Discover as your only option.

Cash Still Works — and Counterfeits Are Vanishingly Rare

Cash hasn’t disappeared, and there’s no safety reason to avoid it. The Bank of Korea reported just 41 counterfeit banknotes found in circulation nationwide in the first half of 2026 — down 33.9% from 62 in the same period of 2025 — which works out to about 0.6 counterfeit notes per 100 million banknotes in circulation, a rate the Bank of Korea’s reporting puts well below the UK, EU, Canada, or Japan. What little counterfeiting does turn up skews toward the higher-denomination 50,000-won and 10,000-won notes.

Analysis: Practically, that means the instinct some travelers bring from other countries — check every large bill, be wary of cash from unfamiliar sources — just doesn’t apply here. For most US visitors, day-to-day life in Korea now runs on very little cash anyway, since T-money, contactless card terminals, and mobile pay cover nearly every routine purchase; cash ends up being more of a backup than a necessity.

Mobile Pay Apps Locals Use (and Why Visitors Mostly Don’t Need Them)

Walk into any Korean convenience store or supermarket and you’ll see locals tapping their phones as often as swiping a card. Kakao Pay and Naver Pay, in particular, are woven into daily life the way Apple Pay or Venmo are in the US, and both are now accepted directly at Seoul’s upgraded subway ticket machines alongside international cards.

You mostly don’t need to set one of these up as a visitor. Kakao Pay and Naver Pay are built around Korean bank accounts and Korean phone verification, which makes onboarding as a foreigner more friction than it’s worth for a short trip. Between a US Visa or Mastercard, a T-money card, and Apple Pay through Apple Wallet, a US visitor already has every payment rail that matters covered without opening a single Korean account.