Who will be the President of Brazil in March 2027 (i.e., holding the office, following the October 2026 election and the January 1, 2027 inauguration)?

rationale:

Current State of the Race As of October 4, 2026, the first round of voting has concluded but no official results have yet been tabulated reuters.com. Every Brazilian presidential election since 2002 has gone to a second round, and current data strongly points to a runoff on October 25 between the incumbent, Luiz Inácio Lula da Silva, and Flávio Bolsonaro 2 sources.

Polling and Momentum While Lula holds a slight edge in first-round preferences, runoff simulations show a statistical dead heat with momentum favoring the challenger. The final Datafolha poll shows Lula leading a hypothetical runoff 47% to 46%, his narrowest advantage since August g1.globo.com. AtlasIntel projects a near-exact tie at 47.6% to 47.4% jota.info, and Quaest shows Flávio Bolsonaro leading 44% to 42% g1.globo.com. A critical factor in the runoff will be third-party vote transfers. Quaest data indicates that supporters of minor candidates—such as Ronaldo Caiado, Renan Santos, and Augusto Cury—break heavily for Flávio g1.globo.com. Furthermore, pollsters have noted a late "useful vote" consolidation on the right, suggesting Flávio's ceiling may be higher than initial surveys implied g1.globo.com.

Market Sentiment and Historical Precedent Prediction markets heavily favor Flávio Bolsonaro, pricing him at approximately 60% to 61% on the eve of the election 2 sources. This premium appears driven by his late polling surge and an expectation that polls may again underestimate right-wing support, as they did in the 2022 first round riotimesonline.com. However, fully adopting the market's 60% probability is overly aggressive. High-quality polls remain effectively tied, Lula benefits from structural incumbency advantages, and Flávio faces downside risk from an active Supreme Court-authorized Federal Police investigation into campaign funding. Balancing these factors, Flávio holds a slight, but not overwhelming, advantage.

Risks and Alternatives An assignment of 2% for "Another person" accounts for tail risks between the election and the March 15, 2027 resolution date. Lula is 80 years old and was treated for early-stage skin cancer in mid-2026, introducing a small but non-zero risk of death or incapacity that would elevate the vice president g1.globo.com. On the other side, Flávio's ongoing legal scrutiny could theoretically result in severe procedural or legal disruptions post-election. Finally, while minor candidates theoretically remain on the ballot, none hold a realistic path to an outright victory, consistently polling in the low single digits 2 sources.