Security and privacy
TAN
Abbreviation for transaction authentication number
In short and in plain language
A TAN is a code you can use just once.
You need it in online banking. With it you can approve a transfer, for example.
The code mostly comes through an app on your phone. Or it comes from a small extra device.
Definition
A TAN is a one-time code used in online banking to approve a transfer, for example. It usually arrives through an app on the smartphone or a small separate device.