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Korea's integrated transfer discount lets riders switch between bus and subway, or between two buses, within a set time window — typically thirty minutes, extended to sixty at night — while paying little or no extra fare, but this discount only calculates correctly if the rider taps their card again when exiting the bus. Skipping that tap-off means the system can't confirm where the trip ended, so it may charge the maximum possible fare or fail to register the transfer discount on the next ride.
Tapping off does not double your fare — quite the opposite, it's what prevents an inflated fare — and tap-off matters for buses and subways alike, not exclusively taxis, which use a different metering system entirely.
This system exists because bus fares in Korea's distance-based zones depend on where you got off, so the tap-off isn't just a formality; it's the actual mechanism the fare calculation relies on to know your true travel distance.
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