Corruption Probe Against Flávio Bolsonaro Adds Legal Risk to Tight Brazilian Presidential Race

The campaign of Brazilian presidential candidate Flávio Bolsonaro was destabilized this week after the country’s highest court unsealed documents confirming the senator is under investigation for alleged corruption, money laundering, and currency evasion. The investigation focuses on the financing of a film about his father, former President Jair Bolsonaro, just weeks before the October 4 first-round election.

Senator Bolsonaro, the leading right-wing challenger to incumbent President Luiz Inácio Lula da Silva, is accused of receiving 61 million reais (approximately $12 million) from Daniel Vorcaro, a banker at the center of the collapsed Banco Master financial scandal. The unsealed documents reveal that the probe, opened in July 2025 by Supreme Court Justice Andre Mendonca, is scrutinizing the funds used for the unreleased biopic, titled Dark Horse.

For a foreign audience, the central figure is critical: Flávio Bolsonaro is not only the eldest son of the former president—who is currently serving a 27-year prison sentence for his role in an attempted coup following the 2022 election—but has successfully positioned himself as the main opposition candidate, running on a platform of anti-corruption and conservative social values. The Supreme Federal Court (STF), which authorized the investigation, holds "special jurisdiction" for federal lawmakers like the Senator, meaning it has the authority to investigate and prosecute him.

Investigators suspect that the funds from the disgraced banker were funneled into U.S.-based accounts and potentially misused, including for the political activities and expenses of Flávio’s brother, Eduardo Bolsonaro, who lives in the United States. While Flávio Bolsonaro has denied any wrongdoing, stating that the project relied strictly on "private sponsorship," the timing of the court's revelation—three weeks before the vote—threatens to undermine his campaign's core message.

Polls show the race between Flávio Bolsonaro and President Lula da Silva is statistically tied in a simulated second-round runoff, making any new variable highly consequential. Though Brazilian law does not prohibit a candidate under investigation from running for office, political analysts suggest the scandal could sway a small, undecided segment of voters, adding a layer of significant uncertainty to the final stage of an already deeply polarized election.