# Flávio Bolsonaro leads Lula 51% to 49% in Datafolha poll a week before Brazil's runoff

The October 25 contest is a statistical tie. Meta admitted that "technical failures" hit Lula's campaign, and a university study warned that cuts to social benefits would hurt towns in Brazil's interior.

- Published: 2026-10-18T05:07:38.100Z
- Canonical: https://polylog.news/2026-10-18/fl-vio-bolsonaro-leads-lula-51-to-49-in-datafolha-poll-a-wee
- Publisher: Polylog (Global desk)
- Section: world
- Sources: [MercoPress](https://en.mercopress.com/2026/10/17/bolsonaro-and-lula-head-into-the-final-stretch-of-brazil-s-campaign-in-a-statistical-tie?utm_source=feed&utm_medium=rss&utm_content=main&utm_campaign=rss), [Buenos Aires Times](https://www.batimes.com.ar/news/latin-america/brazils-right-embraces-election-betting-odds-amid-polls-scepticism.phtml), [InfoMoney](https://www.infomoney.com.br/politica/erika-hilton-quer-cpi-para-investigar-atuacao-de-big-techs-na-eleicao/), [Agência Brasil](https://agenciabrasil.ebc.com.br/economia/noticia/2026-10/cortes-em-auxilios-sociais-podem-gerar-retracao-em-cidades-do-interior)

Senator Flávio Bolsonaro and President Luiz Inácio Lula da Silva enter the last week before the October 25 runoff [in a statistical tie](https://en.mercopress.com/2026/10/17/bolsonaro-and-lula-head-into-the-final-stretch-of-brazil-s-campaign-in-a-statistical-tie?utm_source=feed&utm_medium=rss&utm_content=main&utm_campaign=rss). A Datafolha survey released Thursday gave Bolsonaro 51% of valid votes. In Datafolha's first runoff poll on October 8, he led [52% to 48%](https://www.brasildefato.com.br/2026/10/08/datafolha-segundo-turno-flavio-bolsonaro-49-lula-45/), so the race has tightened slightly.

Each side is using a different measure of its chances. The Buenos Aires Times reported that Bolsonaro's allies [cite Polymarket prediction odds](https://www.batimes.com.ar/news/latin-america/brazils-right-embraces-election-betting-odds-amid-polls-scepticism.phtml) as a truer reading of voter intent than the polls. On the left, Erika Hilton, a federal deputy, is seeking a congressional inquiry (a CPI, Brazil's parliamentary commission of investigation) into [the role of large technology companies in the election](https://www.infomoney.com.br/politica/erika-hilton-quer-cpi-para-investigar-atuacao-de-big-techs-na-eleicao/). She acted after Meta admitted on Friday that "technical failures" had affected Lula's campaign. The right-leaning Partido Novo has filed a complaint with the electoral court against [pro-democracy concerts planned for Sunday](https://agenciabrasil.ebc.com.br/justica/noticia/2026-10/partido-novo-entra-com-acao-no-tse-contra-atos-musicais-por-democracia).

Fiscal policy is the main question for markets. A study by the Center for Research in Macroeconomics of Inequalities (Made) at the University of São Paulo, published by the state news agency Agência Brasil, warned that freezing or cutting social and pension benefits [could cause a severe contraction](https://agenciabrasil.ebc.com.br/economia/noticia/2026-10/cortes-em-auxilios-sociais-podem-gerar-retracao-em-cidades-do-interior) in towns in Brazil's interior that depend on those transfers. The finding supports the government's case against spending restraint, and it also shows how hard any winner will find it to cut spending.

## What this means

Brazil's currency and local interest rates will react less to the winner's name than to the fiscal rules and the finance team that follow. Markets have partly priced a Bolsonaro victory as a turn toward spending discipline. The Made study shows why that may be wrong. Benefit transfers support demand across much of the interior, so any winner faces strong political resistance to cuts, and Congress has to approve them. The precedent is 2002. The real fell sharply before Lula's first victory, then recovered once his "Letter to the Brazilian People" and primary surplus targets showed he would keep fiscal discipline. The desk's read is that within weeks of the result, pricing of the real and local rates will turn on the first named finance minister and any statement on the spending framework. The read would be wrong if the winner names a team quickly but Congress rejects its first fiscal measure. Then the post-election rally, or sell-off, would reverse.

## What to watch

- Whom each candidate names as finance minister before or right after the vote. That choice will tell markets more about fiscal policy than campaign promises do.
- The progress of the inquiry into large technology companies. An inquiry could give the losing side grounds to dispute the result and prolong uncertainty.
- Whether the gap between Polymarket odds and polls widens or narrows in the last week. A wide gap would show how far the two camps disagree about the electorate.