The President and the Vice President of Brazil are elected using the two-round system. Citizens may field their candidacies for the presidency, and participate in the general elections, which are held on the first Sunday in October (in this instance, 7 October 2018). If the most-voted candidate takes more than 50% of the overall vote, he or she is declared elected. If the 50% threshold is not met by any candidate, a second round of voting is held on the last Sunday in October (in this instance, 28 October 2018). In the second round, only the two most-voted candidates from the first round may participate. The winner of the second round is elected President of Brazil. The President selects his/her Vice President.
Federal Senate elections
Two-thirds of the 81 members of the Federal Senate will be elected, the other third having been elected in 2014. Two candidates will be elected from each of the states using majority block voting, with voters able to cast two votes each.
Chamber of Deputies elections
All 513 members of the Chamber of Deputies will be elected, with candidates elected from 27 multi-member constituencies based on the states, varying in size from seven to 70 seats. The Chamber elections are held using open list proportional representation, with seats allocated using the simple quotient. Voting is mandatory and abstainers can be fined.
Legislative Assemblies elections
The State Legislative Assemblies and the Federal District Legislative Chamber elections are held using open list proportional representation, with seats allocated using the simple quotient.
Number of members of each State Legislative Assembly, Federal District Legislative Chamber and the Chamber of Deputies of each States.