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Senado Federal (Federal Senate)

Compare data for parliamentary chambers in the Electoral system module

Parliament name (generic / translated) Congresso nacional / National Congress
Structure of parliament Bicameral
Chamber name (generic / translated) Senado Federal / Federal Senate
Related chamber (for bicameral parliaments) Cámara dos Deputados / Chamber of Deputies
Electoral Law 15 July 1965
Last amendment: 25/05/1990
Mode of designation directly elected 81
Constituencies 27 multi-member (3 seats) constituencies corresponding to the country's 26 states and the Federal District.
Voting system Majority: Block vote. Each elector has as many votes as the number of candidates elected in each constituency. When two thirds of the seats are to be renewed, each elector votes for two candidates. When one third is to be renewed, each elector votes for one candidate.
Vacancies arising between general elections are filled by substitutes elected at the same time as titular members. If no substitute is available and there remain at least 15 months before the end of the term of the member concerned, by elections are held.
Voting is compulsory, abstention being punishable by a fine.
Voter requirements - age: 16 years (optional); 18 years (mandatory registration)
- Brazilian citizenship
- disqualifications: insanity, imprisonment, lack of full political rights, military personnel below the rank of sergeant
Eligibility - qualified electors
- age: 35 years
- Brazilian citizenship by birth
- full possession of political rights
- membership of recognized
political party
- residence in the constituency where running
- ineligibility: illiteracy
Incompatibilities - certain high public and military positions
- certain posts in public or semi-public companies
Candidacy requirements (data unavailable)

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