Pedro Sánchez is facing defeat.
New UK legislation will end the 15-year limit on voting for expats.
The overseas electors change is expected to be made and come into force in January 2024.
The Partido Popular came first in a general election, but acting Prime Minister Mariano Rajoy fell short of a majority for the second time in six months.
It is the most uncertain general election in Spain's post-Franco democratic era.
PP loses a third of seats in Congress. Rajoy intends to form a government though. PSOE loses seats, but the result is not as catastrophic as had been predicted. The C's perform less well than opinion polls had suggested. Podemos emerges as the third force. PP wins in the Balearics - three seats, but these are two fewer than in 2011.
Yet another new look for Magalluf, an apparent drought and an end to black payments for property. Some of the themes over the past week in The Bulletin.
The PP has won the election, but how meaningful will this now prove to be?
A total of 726,264 people in the Balearics will be eligible to vote in Sunday's general election.
“We can secure a great victory,” Rajoy said of the election on 20 December.
Podemos, which wants to loosen the grip of austerity introduced by Rajoy’s government, is running in third place.
- Super luxury Scenic Eclipse comes out of the cold in Mallorca
- Big increase in Balearic snake population (and they can also swim!)
- Fire burns down a villa in Calvia
- British cruise ship which made controversial visit to Cornish town docks in Palma
- Illegal holiday homes could soon be available to rent (legally!)