Who has to file in Spain
A non-resident heir or donee must file when the inherited or gifted asset is located in Spanish territory, or when rights over it can be exercised in Spain. Non-residents file with the AEAT (Oficina Nacional de Gestión Tributaria), not with a regional tax office, but they can claim the reductions and allowances of the region where the property is situated. Where several heirs exist, each one files their own Modelo 650 for their individual share — there is no single joint return.