Chamber of Deputies The 257 members of the
Chamber of Deputies are elected by proportional representation in 24 multi-member constituencies based on the
provinces (plus the
City of Buenos Aires). Seats are allocated using the
d'Hondt method with a 3% electoral threshold. In this election, 127 of the 257 seats are up for renewal for a four-year term.
Senate The 72 members of the
Senate are elected in the same 24 constituencies, with three seats in each. The party receiving the most votes in each constituency wins two seats, with the third seat awarded to the second-placed party. The 2017 elections will see one-third of Senators renewed, with eight provinces electing three Senators; Buenos Aires, Formosa, Jujuy, La Rioja, Misiones, San Juan, San Luis and Santa Cruz. == Schedule ==