During the online purchasing process, you will see this tab where you can choose whether you are a resident or not. You will automatically see that the price adjusts to this selection.
It is not until the end of the purchasing process that you can make a reservation with one condition or another, and it is necessary to provide proof of residence with a valid certificate of registration.
Citizens of the European Union residing in the Balearic Islands, Canary Islands, Ceuta, or Melilla can benefit from a 75% discount on the passenger fare.
Residents of Formentera will receive an 89% discount on the passenger fare for routes connecting the island to Ibiza.
Check the required documentation here.