Brazilians vote in presidential runoff as Lula bids historic comeback against Flávio Bolsonaro

Brazilians cast ballots on Sunday in one of the most consequential and closely contested presidential elections in the country's modern democratic history, with incumbent President Luiz Inácio Lula da Silva facing senator Flávio Bolsonaro in a runoff that polling suggests neither candidate can claim with confidence.

Polls opened at 8 a.m. Brasília time across a country of more than 158 million registered voters, for whom voting is compulsory between the ages of 18 and 70. Official counting was set to begin at 5 p.m. local time once booths closed.

Flávio Bolsonaro, 45, a Liberal Party senator and eldest son of imprisoned former president Jair Bolsonaro, surprised observers by topping the first-round vote on October 4 with 47.03 percent — roughly 56.1 million votes — against Lula's 45.16 percent and roughly 53.9 million. Neither candidate cleared the absolute majority required to avoid a runoff, sending the contest to a second round three weeks later.

Lula, an 80-year-old Workers' Party stalwart seeking an unprecedented fourth term, has spent the intervening weeks clawing back ground. Final pre-election surveys released Friday showed an average of approximately 51 percent for Flávio Bolsonaro against 49 percent for Lula among valid votes, with multiple pollsters — including Datafolha and Quaest — placing the gap at exactly two percentage points, well within statistical uncertainty. Prediction markets assigned Flávio a roughly 80 percent probability of winning, reflecting the lingering advantage his first-round performance established.

Flávio Bolsonaro has campaigned on a pledge to militarise Brazil's response to organised crime, lower the age of criminal responsibility, and repair relations with Washington that frayed under Lula's administration during the Trump years. He has proposed labelling major drug gangs narco-terrorist organisations and has outlined a sweeping infrastructure plan valued at 900 billion reais. Projecting a more polished image than his father, he has also promised spending discipline and a return to privatisation.

Lula, whose earlier corruption convictions were overturned, has pointed to reductions in unemployment and poverty during his current term and to a measurable decline in Amazon deforestation as evidence that his presidency has delivered. He has framed the runoff as a referendum on Brazilian democracy itself, warning that a Bolsonaro victory would accelerate the authoritarian tendencies he associates with the family. His campaign has also focused on taxing wealthy investors and diversifying Brazil's trade partnerships in response to US tariffs imposed under President Trump.

The campaign's final weeks were marked by a combative televised debate on October 18 and by a legal dispute over social media conduct. Brazil's electoral court ordered Meta to treat both campaigns equally on its platforms after Lula's team alleged that Instagram had suppressed pro-government content, imposing a fine of 500,000 reais per day for non-compliance.

The political backdrop is shaped heavily by the elder Bolsonaro's fate. Jair Bolsonaro is currently serving a 27-year sentence handed down for his role in a coup plot following his 2022 election defeat to Lula. His continued imprisonment has galvanised his base around Flávio while giving Lula's allies fresh ammunition about the family's democratic credentials.

First-round abstentions reached 21.08 percent, the highest rate since 1998, a figure analysts have scrutinised for clues about which candidate might benefit from late-breaking turnout swings. Financial markets reacted to the first-round outcome with a 7.7 percent surge in Brazilian equities, interpreting Flávio's strong showing as a signal of potential policy change; the real has since softened to around 5.05 per dollar.

Six state governorship runoffs are being held concurrently, adding further complexity to Sunday's political landscape. The outcome of the presidential contest will have significant implications not only for Brazil's domestic policy on crime, fiscal discipline and the environment, but also for the country's posture within a Latin America that has shifted markedly to the right in recent electoral cycles. Results are expected late Sunday evening Brasília time.