Musical chairs: which parties gained and which lost space in the National Congress

In the Chamber of Deputies, the PL expanded the bench by 23 seats and reaches 121 deputies in the next legislature; in the Federal Senate, there are now 28 senators.

In the Chamber, the PL's advance was clear over the other parties. PT and Novo appear next, both with growth of five seats. While the PT went from 65 to 70 deputies, the Novo doubled its representation, reaching 10 parliamentarians — the largest proportional growth, in relation to the deputies elected in 2022. PRD, PSOL and PV also registered an increase in benches, although on a smaller scale.

At the other end, União Brasil and PSDB were the acronyms that lost the most space in the Chamber. Both parties shrank by six seats. União Brasil went from 52 to 46 deputies, and the PSDB fell from 17 to 11, registering one of the biggest proportional declines among the parties.

Podemos, PCdoB, Avante and Missão maintained the size of the bench from one legislature to the next. But this does not mean that these parties remained with all the same deputies.

At Podemos, of the 27 deputies currently on the bench, 12 were re-elected for the next legislature. The same happened with 7 of the 11 deputies from PCdoB, 4 of the 5 deputies from Avante and the only deputy from Missão.

The most significant gains after the PL were with Novo and União Brasil, which won three seats each. The Network also expanded its representation, while PT and PDT maintained the same bench size.

The survey combines the 54 senators elected in 2026 with the expected occupants of the 27 seats whose terms end in January 2031. The senator's term of office is eight years and the House has 81 seats in total.

The PSD recorded the biggest reduction among all parties, with a drop of nine seats. The bench will have five senators in 2027. The PSB lost three seats, while the PP and PSDB had a reduction of two seats each.

MDB, Republicans, Podemos and Avante also shrank, with the loss of one representative. Despite the reduction in some acronyms, the redesign of the Senate was less dispersed than that observed in the Chamber, concentrating the biggest gains in a few parties.