Transport for London (TfL) is introducing a £3 deposit for Oyster cards from May.
The change means that customers buying a season ticket for more than a week will have to pay £3 when they buy a new card or replace an old one.
The refundable deposit is intended to cut down on the million cards either lost or discarded each year.
There are about seven million of the electronic travel smartcards are in use, which were introduced in 2003.
Passengers who use Oyster pay-as-you-go already pay the £3 refundable deposit and the change does not affect anyone with an existing card.
The deposit scheme begins on 17 May.