Auckland Transport has made changes to its system which was wiping money off people's transport cards if they were not used.
Under its terms and conditions, any money added on a HOP card via the AT website expires if the card is not used again within 60 days.
In the year to April, Auckland Transport pocketed more than $340,000 that had expired.
The transport provider has now put a warning on its website to tell commuters the funds expire if the card is not used in 60 days.
It is also going to introduce a system in which people get an automatic refund to their bank account, if their card is wiped.