Navigating Korea: The Essential Guide to T-money Cards

Dear reader,

In my last letter, I told you to use Naver Map instead of Google Maps in Korea. Today’s letter is its perfect companion. Once you’ve found your way on the map, it’s time to actually travel that route. And the easiest way for a traveler to use Korea’s dense public transportation is the T-money card.

I still remember buying my very first T-money card as a student, fumbling with coins at a subway booth, amazed that one small card could just tap me through the gates. Years later, I’ve handed cards to visiting friends from abroad and watched the same little moment of delight on their faces when the gate opens with a single tap. It’s a tiny thing, but it’s often the first moment Korea starts to feel easy.

So, what is T-money?

T-money is the most widely used transit card in Korea. It’s a rechargeable prepaid card: you load money onto it in advance, and when you take the subway or bus, you just tap it on the reader and the fare comes off automatically. No buying a ticket every time, no counting out change. It’s the exact same card Koreans use every day. There’s no separate tourist version with different rules. You’re using the same card as the locals.

The biggest benefit isn’t so much saving money as removing friction. You don’t fumble for the fare in a bus queue, you don’t decode a vending machine menu, you just tap and go. Removing that small, repeated friction alone makes the whole trip much smoother.

Where to buy it and how much it costs

Here’s everything you need in one place:

• Where: Any convenience store in the country. Look for GS25, CU, or 7-Eleven.
• Price: Roughly 3,000 to 4,000 won for the card itself, depending on the design. The balance is loaded separately, and the card fee is not refundable, so think of the card as a little souvenir you get to keep.
• How to ask: Say “T-money card juseyo,” or just point at the card and hand over cash.
• At the airport: You can buy one at a convenience store inside Incheon Airport. If you’re arriving late at night, though, some booths may be closed, so a store near your hotel is a fine backup.
• How to top up: At a convenience store counter or a charging machine in any subway station. For a 3 to 4 day trip, 30,000 to 50,000 won is plenty. To top up at a store, say “T-money chungjeon.”

One thing deserves its own line, because it trips people up constantly:

You cannot top up T-money with a foreign credit card at a convenience store. Korean payment terminals require a card issued by a Korean bank for T-money loads. So plan to charge it with cash, and keep a bit of Korean money on hand.

When I took my cousin from overseas around Seoul, this was the one thing that caught her out. She assumed she could charge the card with her Visa at the counter, and we ended up hunting for an ATM before her first subway ride. Learn from her, and carry some cash for that first top-up.

Quick recap: convenience store, 3,000 to 4,000 won for the card, load 30,000 to 50,000 won in cash, and remember that foreign cards won’t work for topping up in store.

Where you can use it

The real value of T-money is in how widely it works. A single card bought in Seoul can take you across the whole country. It works on subways, buses, and taxis in Busan, Daegu, Incheon, Gwangju, and Jeju, on public transit nationwide. And neither the card nor the balance you load ever expires. If you don’t use it all this time, you can pick it up again on your next trip to Korea. I have one in a drawer right now with a little change still on it, waiting for whenever I next pass through a turnstile.

It’s good for more than transit, too. You can pay with T-money at convenience stores, marts, and some cafés and shops. When you’re low on Korean cash, using T-money for small purchases instead of breaking a big bill is handy.

Here’s a small tip. Korean public transit has transfer discounts. If you switch from subway to bus, or bus to subway, within a set time, you pay little or no extra fare. But to get this discount, you have to tap your card when you get off, too. It’s easy to forget when stepping off a bus, so don’t miss it, or you’ll lose the transfer discount. For the full list of fares and transfer rules, see the official T-money usage guide.

Quick recap: works nationwide on transit and at many shops, never expires, and always tap off the bus to keep your transfer discount.

What’s changed in 2026

Things have actually been shifting lately, so let me share the latest.

Since April 2026, travelers who add a Mastercard to Apple Pay can tap their iPhone or Apple Watch directly on Seoul subway gates to ride. It’s the first time a phone-only, no-card option has been available. And since March 2026, you can select the foreigner option in the Mobile T-money app, add a card to Apple Wallet, and top up with Mastercard, Amex, or UnionPay (a roughly 3.7 percent fee applies, and Visa support is said to be coming later).

So if you use a Mastercard on an iPhone, getting around with just your phone and no physical card is now an option. That said, these features are newly introduced and come with conditions, so the most reliable and simplest method is still buying a physical T-money card at a convenience store and topping it up with cash. Especially if you plan to travel outside Seoul, a physical card gives you peace of mind.

Quick recap: phone-tap options exist in 2026 if you have a Mastercard on an iPhone, but a physical card with cash is still the safest bet, especially outside Seoul.

When your trip ends: refunds

Before you leave Korea, you can get the remaining balance on your card refunded. Surprisingly many travelers just toss their cards and leave the balance behind, but it’s your money, so be sure to claim it.

• Up to 20,000 won: Refund at a convenience store like GS25 or CU, with a 500 won fee. Say “hwanbul hae juseyo.”
• Larger balances: T-money service centers in Seoul Station or Myeongdong, or the refund kiosks at Incheon Airport.
• Note: The card purchase price itself isn’t refundable, but the balance you loaded can be returned.

Quick recap: claim your leftover balance before flying home. Small amounts at any convenience store, larger amounts at a service center or the airport.

To sum up

When you arrive in Korea, buy a T-money card at a convenience store and load 30,000 to 50,000 won in cash. Then tap it every time you board the subway or a bus, and remember to tap again when you get off. This one card lets you travel by public transit anywhere in Korea, from Seoul to Busan to Jeju. Find your way with Naver Map and travel with T-money, and even a visitor can get around Korea like a local. For anything I didn’t cover here, the official T-money website has the latest details.

Now I’d love to hear from you. How does public transportation work where you live? Do you have a tap-and-go card like T-money, or something completely different? And if you’ve already been to Korea, did the T-money card trip you up or win you over? Tell me in the comments. I read every one.

See you in the next letter.

From Seoul, whigoori