Brazil’s party system is closing the door Bolsonaro once walked through

In 2018, Jair Bolsonaro showed how relatively cheap it could be to disrupt Brazil’s party system. The PSL had elected just one federal deputy in 2014. Four years later, riding Bolsonaro’s presidential wave, it elected 52 and became the second-largest caucus in the lower house. It did so after receiving just R$9.2 million from Brazil’s public campaign fund. Thirty parties won seats in that Congress, while the so-called effective number of parties — an index that weights parties by the size of their congressional delegations — reached a record 16. It was an extraordinarily fragmented political market, crowded with small players and therefore vulnerable to a newcomer with a sufficiently popular product.

Eight years later, the direction of travel has reversed. The effective number of political forces in the Chamber of Deputies, which had already fallen to around 9 in 2022, is expected to decline again to roughly 7 in the legislature taking office in 2027. The PL, now the main institutional home of the political movement built around Bolsonaro, is no longer an outsider trying to break in: it elected 121 of the Chamber’s 513 members, giving it the largest caucus. The movement that once prospered from fragmentation is now one of the biggest beneficiaries of concentration. The PL climbed the ladder and made it to the penthouse.

The shift was no accident. Brazil’s electoral performance threshold was designed precisely to curb party fragmentation. In 2018, a party needed just 1.5% of the nationwide vote for the Chamber, subject to minimum geographic distribution, or nine deputies elected across the country to retain access to the Party Fund and free broadcast time. In 2026, the threshold rose to 2.5% or 13 deputies; in 2030 it will reach 3% or 15. Brazil’s electoral authorities have explicitly acknowledged that the rule is helping reduce fragmentation. The country’s notorious alphabet soup of parties has finally been put on a diet.

The catch is that another set of rules works simultaneously in favor of those that have already achieved scale. Of Brazil’s public campaign fund, only 2% is divided equally among parties; 35% is allocated according to their previous vote for the Chamber, 48% according to the size of their lower-house caucuses and 15% according to their representation in the Senate. In 2026, the PL received R$881.7 million from the fund, compared with R$615.4 million for the PT. Both emerged from Sunday’s election with the two largest blocs in the Chamber. The annual Party Fund is even more concentrated: 95% is distributed in proportion to votes won for federal deputy, while the remaining 5% is shared only among parties that clear the performance threshold. Put simply, votes buy political infrastructure, infrastructure helps produce more votes, and those additional votes buy still more power.

The irony was spotted long before Brazil’s modern campaign fund existed. In 2000, when Brasília was debating public financing of elections, Senator Pedro Simon recorded an objection raised by Inocêncio Oliveira, then a senior PFL leader and former speaker of the Chamber. According to Simon, Inocêncio wondered what would happen if the PT, already winning so many votes without public money, suddenly received something like R$100 million to campaign. Only months earlier, Inocêncio himself had defended public financing as a way of reducing politicians’ dependence on private donations, which were still legal at the time. He may have guessed the wrong permanent beneficiary, but he understood the mechanism: public money distributed according to electoral strength tends to reward electoral strength.

Corporate campaign donations were banned in 2015, during the Lava Jato era and amid extreme party fragmentation; the Special Campaign Financing Fund followed in 2017. What emerged was not a machine designed to favor the PT, the PL or any particular ideology. It was a machine that favors scale. Parties with more votes receive more resources; those resources can finance more competitive candidates, sustain a nationwide organization, attract politicians and defend existing seats. The system is democratic at the front end — voters supply the votes — but increasingly cumulative at the back end.

Missão offers an almost cruel snapshot of the new cost of entry. Earlier this year, the party was internally working with the possibility of electing 10 to 15 federal deputies. It had built a national organization, fielded a presidential candidate, Renan Santos, secured substantial national exposure, developed a well-known digital operation and counted Kim Kataguiri among Brazil’s most visible lawmakers. In the end, it managed to re-elect just one federal deputy: Kim himself. The point is not whether the party misjudged its strength. It is the difference between crashing the party market in 2018 and trying to do the same in 2026 without access to comparable public funding. The PSL turned a presidential wave into 52 seats almost overnight. Repeating that feat is becoming much more expensive.

That matters for 2030. The PL did not merely win 121 seats in 2026; under the current rules, it also secured a privileged starting position in the future distribution of public money, political exposure and party infrastructure. The same logic applies, in varying degrees, to the PT, União/PP, PSD, Republicanos and the other large blocs. None of this guarantees that any of them will continue winning elections — Brazilian political history is full of once-dominant parties that later shrank. It does mean that challengers will increasingly face better-capitalized incumbents in a system with less room for small competitors. The hurdle is no longer simply winning votes. It is surviving long enough to achieve scale.

Brazil may therefore be solving one old problem by creating another. A Congress with seven effective parties is probably easier to understand than one with 16, and negotiating with fewer caucuses may simplify coalition-building. But fewer sellers do not necessarily mean a lower price. If the survivors control larger shares of Congress, public funds, broadcast time and local political machines, they may be able to charge more for their support — while newcomers will need to spend far more, through formal channels or otherwise, to threaten them. Bolsonaro entered in 2018 through a door opened by fragmentation. The system his political movement now helps dominate is slowly closing that door behind him.