Several T-money Cards on One Trip? How to Keep Every Balance Straight

Why does each traveler need their own card?

Korean transit is built around one card per person:

• Subway gates let one person through per tap. You cannot tap once for the whole family.
• Transfer discounts are tracked per card. A discounted subway-to-bus transfer only works when the same card made both trips.
• Child and teen fares only apply on a card registered for that age group. A child using an adult's spare card pays the adult fare.

So a couple ends up with two cards, a family of four with four, and a group of friends with one each. That is easy at the start of the trip. It gets messy by day three.

What goes wrong with several cards?

Anyone who has traveled in a group in Seoul will recognize at least one of these:

• The cards look identical. Plain T-money cards are hard to tell apart, and they end up in the wrong pockets.
• Someone gets stuck at the gate. One card runs low while the others are fine, and you only find out when the gate beeps.
• You top up the wrong card. Then one person has ₩30,000 and another is short.
• Leftover money is spread across cards. On the last day, nobody knows how much is on which card, or whether a refund is worth the fee.

All of these come from the same problem: you cannot see a balance without tapping the card somewhere.

How do I track several cards with TapSeoul?

TapSeoul reads a physical prepaid T-money card with your phone's NFC and remembers each card separately. One phone can keep track of the whole group's cards:

1. Open the Card tab and tap Read my card, then hold the first card against your phone.
2. Because it is a new card, the app says "New card. Give it a name so you can tell it apart." Type a nickname such as "Mine", "Mom", "Kids" or a friend's name and tap Save name.
3. Repeat with the next card. Each one appears under My cards with its own nickname.
4. For every card, you see the Balance at last scan and the Last scanned time.
5. Later, scan any card again to update only that card. Scanning cards in a different order does not mix them up; each card keeps its own balance.

Open a card to see its history of balance readings, kept by year (up to 300 readings per card). It is a record of what the balance was each time you checked, not a payment statement, but it shows you at a glance how quickly each card is going down.

You can rename a card or remove it whenever you like. There is no account and nothing is uploaded: card nicknames, references and balances stay on the phone that scanned them.

A simple routine for families and groups

1. In the morning, scan everyone's card at the hotel. It takes a few seconds per card.
2. Top up only the low ones at a convenience store or station machine (cash). Aim for at least a day's worth of rides on each card.
3. During the day, you do not need the app. Just tap and ride.
4. On the last day, scan all the cards again. Now you know exactly what is left on each one and can decide whether to refund it or keep it for next time.

Tip: To tell the physical cards apart, buy different designs or put a small sticker on each one that matches its nickname in the app.

Do T-money cards from a previous trip still work?

Usually, yes. If you kept a card from an earlier trip, it is worth bringing: scan it before your first ride to see what is still on it, and top it up if needed.

A few exceptions:

• Some very early T-money cards from before nationwide compatibility began in 2014 may not work everywhere.
• A card that is cracked or bent may not read reliably. Ask at a station information center or a convenience store.
• If a gate refuses an old card, ask staff before topping it up.

TapSeoul can usually read an older card if it is a physical prepaid T-money card. If it can't, the app says the card isn't supported rather than guessing.

Should I refund leftover balance or keep the card?

You can get leftover money back, usually for a ₩500 fee: smaller amounts at convenience stores, and larger amounts at T-money Town near Seoul Station. The price of the card itself is not refunded.

A quick rule of thumb:

• Small balance, likely to come back: keep the card. It costs nothing to keep, and you skip buying a new one next time.
• Larger balance, not coming back soon: refund it, keeping in mind that limits vary by place.

Either way, scanning all the cards on the last day tells you what you are deciding about. For more on refunds and fares, see the T-money card guide.

FAQ