Joaquín Leguina's PSOE suffered from PM Felipe González' unpopularity at national level and fell below 30% for the first time in a regional election.

The third party, United Left (IU), benefitted from the PSOE's decline and polled just over 16%, their highest vote share at a Madrid Assembly election to date.

[1] Voting for the Assembly was on the basis of universal suffrage, which comprised all nationals over 18 years of age, registered in the Community of Madrid and in full enjoyment of their political rights.

All members of the Assembly of Madrid were elected using the D'Hondt method and a closed list proportional representation, with an electoral threshold of five percent of valid votes—which included blank ballots—being applied regionally.

[1][2][3] The president of the Community had the prerogative to dissolve the Assembly of Madrid and call a snap election, provided that no motion of no confidence was in process and that dissolution did not occur before one year had elapsed since the previous one.

[7] Investiture processes to elect the President of the Community of Madrid required for an absolute majority—more than half the votes cast—to be obtained in the first ballot.