What to know as Brazil prepares for tense presidential run-off

The run-off election on October 25, 2026, will decide who leads Brazil for the next four years.

Senator Flavio Bolsonaro, the right-wing candidate, narrowly defeated incumbent President Luiz Inacio Lula da Silva in the first round on October 4, securing 47 percent of the vote compared to just over 45 percent for Lula.

Neither candidate achieved the majority needed to avoid a second vote, setting the stage for a highly polarised contest.

A tight race and shifting polls

Following his first-round victory, Flavio Bolsonaro emerged as the race's de facto frontrunner.

However, recent polls indicate a tight race with Lula cutting into Bolsonaro's lead but still trailing within the margin of error.

A Nexus poll released on October 21 showed Lula winning 44 percent of the vote and Bolsonaro 45 percent, a narrowing of the gap from earlier in the month.

Earlier polls had shown a wider lead for Bolsonaro, including a Nexus poll on Monday that showed him with 46.5 percent and Lula with 45.9 percent.

An AtlasIntel and Bloomberg poll released on the same day showed Bolsonaro with 49.8 percent and Lula with 47.6 percent.

Campaigns and political stakes

The run-off has become a pivotal moment for Latin America's political landscape.

A victory for Bolsonaro would extend a streak of far-right electoral successes in the region, which have included promises of closer ties with the United States, a hard line on crime, and market-friendly economic policies.

Lula, a leftist, has been a key holdout against this regional shift, and his defeat would galvanise conservative movements across Latin America.

Lula is campaigning on his record of reducing unemployment and poverty, as well as his efforts to build ties between developing nations.

He has promised to implement a constitutional amendment to reduce the six-day work week and has pledged free public transport on weekends.

Bolsonaro's platform and challenges

Flavio Bolsonaro has sought to project a more polished image than his father, former President Jair Bolsonaro, who is serving a 27-year prison sentence for his involvement in a coup plot following his 2022 loss.

The 45-year-old senator is the de facto leader of the country's political right and has pledged continuity with his father's beliefs.

He has promised a militarised approach to crime and insecurity, close partnership with the administration of US President Donald Trump, and to rein in inflation and government spending.

Bolsonaro has also said he would "redemocratise" Brazil by reforming the constitution, a move that could have significant implications for the judiciary and the country's democratic institutions.

His campaign has faced allegations of foreign interference, with Meta facing claims that it restricted pro-Lula activity online to support Bolsonaro.

Regional and global implications

The outcome of the election will have far-reaching consequences beyond Brazil's borders.

A Bolsonaro victory would mark the largest country in Latin America joining the growing list of nations that have elected far-right leaders.

It would also strengthen the position of conservatives in the region and potentially expand US military involvement in Latin America under the Trump administration.

Observers have expressed concern that the US could throw its support behind Bolsonaro based on false claims of widespread fraud, mirroring rhetoric used by the Brazilian right to cast doubt on the reliability of the country's voting system.