With the matter of taxes out of the way it is then possible to transfer the assets into the name of the beneficiaries.The exact requirement here depends upon the nature of the asset.
For example, a property should be registered in the name of the beneficiary in the local Property Registry (typically near or may also be located in the town-hall or Ayuntamiento).
A car should be registered at the nearest department of ‘Traffico’.
Both of these processes will require all of the standard documentation: in the case of the car – details of the car such as the log book, mot certificate, as well as the ‘cuaderno particional’, original (not a copy)death certificate etc; in the case of the property you will need to bring the deeds of the property as well as the death certificate and the ‘cuaderno particional’.
In both instances you will require original and copies of your DNI or passport.
Please note that following a judgment by the European Court, the Spanish government has passed into law Ley 26/2014, which came into force on January 1st, 2015. The new legislation provides that European Union citizens, ordinarily resident in another European country, may apply any deductions available to residents of the region in Spain in which their assets are located.