Tagless payment lets you pay for public transport just by boarding, with no card or phone tapped at the gate. Tapping feels small, until your hands are full or the station is packed at rush hour. Here is what tagless payment is, how it works, and who brought it to the real world first.
1. What is tagless payment (Be-In Be-Out)?
Tagless payment lets passengers pay for public transport just by boarding, with no card or phone tapped at the gate. It is also called Be-In Be-Out (BIBO): the system detects when a rider enters and exits and charges the correct fare automatically. Unlike a card that has to touch a reader, tagless payment removes the physical tap itself, so a phone can stay in a pocket or bag.
2. Tagless payment vs. tap-to-pay (CiCo)
Tagless payment pairs the rider smartphone with the system over Bluetooth Low Energy (BLE), then uses sensors to confirm where the rider enters and exits. On rail, the phone and gate exchange BLE signals, smartphone positioning pinpoints the gate, and gate integration confirms entry and exit. On buses, an in-vehicle beacon detects boarding and alighting, and vehicle operation data ensures a fare is charged only when the bus is at a stop. Underneath, a virtual card and virtual terminal (VT) process fares on a central server, layered on existing AFC.
3. How tagless payment works
Tagless pairs the rider’s smartphone with the payment system over Bluetooth Low Energy (BLE), then uses sensors to confirm exactly where the rider enters and exits.
On rail, three steps work together: the phone and gate exchange BLE signals, smartphone positioning pinpoints which gate is being passed, and gate integration confirms entry and exit. On buses, there’s no gate — an in-vehicle beacon communicates with the phone to detect boarding and alighting, and vehicle operation data is used so a fare is only charged when the bus is actually at a stop.
Underneath, tagless runs on a server-based architecture. A virtual card system and a virtual terminal (VT) process fares centrally, layered on top of the existing Automated Fare Collection (AFC) infrastructure — so operators can apply new fares and policies without replacing gate or terminal hardware.
4. Benefits of tagless payment
Because there is no tap, riders with luggage, strollers, wheelchairs, or full hands pass through with no action, a real accessibility gain. Removing the tap also eases congestion at busy gatelines. And since tagless payment builds on existing AFC, agencies get these gains without replacing their systems.
5. Who pioneered commercial tagless payment
Tmoney commercialized the world first line-level tagless payment on Seoul Ui Sinseol Line in September 2023 (per the Seoul Metropolitan Government and local media), starting with 12 stations. It now covers all stations of Incheon Metro Lines 1 and 2, Seoul Subway Line 9 (Gaehwa-Sinnonhyeon, 25 stations), part of Line 7, and 36 pilot routes on Seoul city buses, currently for Android (Mobile Tmoney) users. Tagless payment by Tmoney won UITP 2023 and Transport Ticketing Global 2024 awards.
6. Frequently asked questions (FAQ)
Q. What is tagless payment?
fare method where riders pay by boarding, without tapping a card or phone; entry and exit are detected automatically.
Q. Is tagless payment the same as tap-to-pay?
No. Tap-to-pay still requires a physical tap; tagless payment (Be-In Be-Out) removes it entirely.
Q. Where is tagless payment used today?
On Seoul Ui Sinseol Line, all stations of Incheon Metro Lines 1 and 2, Seoul Subway Line 9 (25 stations), part of Line 7, and 36 pilot bus routes.
Q. Who pioneered commercial tagless payment?
Tmoney, on Seoul Ui Sinseol Line in September 2023 (per Seoul Metropolitan Government and local media).
