According to the calendar published by the National Elections Commission (CNE) on its website, political parties, party coalitions, and Citizen Voter Groups (GCE) have until 6 pm on 18 August to submit their candidacies for the municipal elections to the district judge with jurisdiction over civil matters in the municipality in which they are running.

At the end of this day, the submitted candidate lists will be immediately posted on the door of the court building. The following day, 19 August, the judge will draw lots to determine the order of the candidates on the ballot, and the results will be sent to the CNE and the mayor of the municipality. A five-day period then elapses for the judge to analyse the lists' compliance with the law and for parties or citizen movements to challenge the regularity of the process or the eligibility of any candidate.

The rectification procedures then begin, and, until September 1st, the accepted rectified lists will be posted on the door of the court building. Several appeals against the judge's decision may still be accepted and filed all the way to the Supreme Federal Court (STF).

Candidates may withdraw from the election up to 48 hours before the election (9 October).

The electoral campaign for the municipal elections will take place between 30 September and 10 October. Voters who, for professional reasons, are unable to vote on election day, such as military personnel, security forces and services, and civil protection agents, members of official government delegations traveling abroad, maritime and aviation workers, long-distance railway and road workers, and representatives of national teams officially participating in sports competitions, may vote early.

To vote, these voters can contact the mayor of the municipality in which they are registered between 2 and 7 October, expressing their desire to exercise their right to vote early.

Patients unable to attend the polling station due to hospitalization, students enrolled in educational institutions in a district, autonomous region, or island other than the one where they would otherwise vote, and voters who are imprisoned without being deprived of political rights may request early voting from the mayor of the municipality in which they are registered until 22 September, either electronically or by mail.

In the 2025 municipal elections, voters will cast ballots to elect the executives and municipal councils of 308 municipalities.

There will also be 3,259 parish assemblies elected, 167 more than in the last municipal elections, due to the replacement of 302 parishes combined in 2012, through the disintegration of 135 parish unions.