Madrid and London are negotiating a bilateral treaty to maintain local voting rights for the 280,000 British nationals living in Spain and the more than 115,000 Spaniards residing in the UK, said diplomatic sources. On March 30, 2019, the UK will exit the European Union and British migrants will lose their right to vote in municipal elections. Whether or not British Prime Minister Theresa May secures parliamentary approval for the Brexit deal, UK nationals will no longer be considered EU citizens after that date. If there is agreement on the transition period, UK citizens in Spain will preserve most of their rights intact until December 2020, but this does not extend to voting in the municipal and European elections of May 26, 2019.
Once it is signed, the deal will be in the same category as any other international treaty and will require ratification by the Spanish and British parliaments. This will probably not happen in time for the May 26 elections next year, diplomatic sources have admitted.
In order to work around this problem, the Spanish Foreign Ministry is considering the option of making the agreement go provisionally into force as soon as it is signed by both governments.