Prices as of Tuesday, August 25, 2026. Record compiled from 32 dated sources; see the sourced record file for every citation.
On July 2, Flávio Bolsonaro put his own forecast in writing. In a submission to the Office of the US Trade Representative, the senator now running for president of Brazil asked the Trump administration "to wait for Brazil's October elections before deciding whether to impose new tariffs" ("a aguardar as eleições brasileiras de outubro antes de decidir se impõe novas tarifas"), asked for a suspension of at least 180 days, and gave his reason: a new round of tariffs "would end up strengthening the re-election campaign of President Luiz Inácio Lula da Silva" ("acabaria fortalecendo a campanha à reeleição"). BBC Brasil published the filing on July 2; Folha's headline that morning said Flávio had told Trump a tariff would hand Lula a political victory.
Trump signed it anyway. On Wednesday, July 15, he ordered a 25% additional tariff on Brazilian goods under Section 301, effective July 22, citing Pix (Brazil's instant-payment system), ethanol and deforestation among its grounds, per Poder360 on July 16. The same day Quaest published a poll of 2,004 voters, fielded before the signing: 51% agreed with Lula that Flávio had asked Trump for the tariff, 30% believed Flávio's denial, and 63% expected it to hurt their own family, per G1.
Seven weeks on, the Bolsonaro campaign's own prediction is the shape of the market. On Kalshi, where a price in cents is the market's probability, "Lula wins the 2026 election" trades at 61 cents bid and 62 cents ask, about a 61.5% chance, roughly -160 in sportsbook terms. Flávio sits at 36 to 37 cents, about +174. The polls, unlike the price, say the runoff is a coin flip.
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The Board
As of August 25, 2026, 19:11 UTC (Kalshi, cents = probability; first number is what buyers offer, second what sellers ask):
| Wins the presidency | Kalshi price | Reads as |
|---|---|---|
| Luiz Inácio Lula da Silva | 61¢ / 62¢ | about 61.5% (≈-160 in sportsbook terms) |
| Flávio Bolsonaro | 36¢ / 37¢ | about 36.5% (≈+174) |
| Renan Santos | 2.3¢ / 2.7¢ | about 2.5% (≈+3900) |
| Jair Bolsonaro | 0.3¢ / 0.4¢ | under 1% |
The last tick went Flávio's way: Lula's previous print was 63, Flávio's 35, a two-cent drift into the Nexus release. Lula's contract has $606,900 of lifetime trading against $248,000 open; Flávio's, $739,800 against $281,500. Polymarket, fetched the same minute, had Lula at 62.5 cents and Flávio at 34.65, with Flávio up 11 cents over 30 days and Santos down 6.9: the third-way money migrated right. Its $132.9 million event volume counts every name ever listed, dead outcomes included; the Lula and Flávio contracts are about $9 million each. Brazil banned election contracts in April and blocked both platforms, so Kalshi and Polymarket price this race from outside. The gap between a 46–45 poll and a 61.5-cent price is the market pricing incumbency, a live police inquiry, and a 51–30 blame split on the tariff, against a lead that went from seven to one in a month.
What the Models Think
We also asked a panel of AI models the same question. Six of the panel's eight seats ran this board, without seeing the price, only the sourced record below. Their blended answer, the middle of the six, put Lula at 55.5%, six points below the 61.5-cent market. The seats ran from 52% to 60%, so the widest gap between two models was 8 points, and the reasons were consistent: every runoff poll since August 9 is a statistical tie; Brazilian incumbents have won three of four re-election bids since 1998, but the polls understated the Bolsonaro-aligned vote in 2022; and the tariff backlash plus the Vorcaro inquiry are what keep Lula's nose in front. One model put it this way: "A dead-heat runoff within the margin of error, but Lula's incumbency and the tariff backlash give him a narrow edge over Flávio's scandals."
The panel's figures are model estimates, not predictions of fact; the market has real money behind it and the panel has only the record.
How It Got Here: A Convicted Father And A Son In Washington
Brazil elects its president in two rounds: if nobody clears 50% of valid votes on October 4, the top two meet again on October 25, and voting is compulsory for citizens 18 to 70, 158.7 million of whom are registered. Lula, 80, is seeking a fourth term. Flávio, 45, a senator for Rio, is on the ballot because his father cannot be: on September 11, 2025, Brazil's Supreme Court sentenced Jair Bolsonaro to 27 years and 3 months for an attempted coup that included a plan to kill Lula. He is under medical house arrest, and on July 3 Justice Alexandre de Moraes revoked his gun permit, per Poder360. Our August read on the full 13-name field is on the earlier Brazil board.
The tariff predates the campaign. Trump's 50% tariff of July 30, 2025, came largely over the Bolsonaro trial, which he called a "witch hunt," and the Section 301 case opened after Eduardo Bolsonaro, Flávio's brother, lobbied Washington to shield their father. In May, Lula went to the White House to head off new tariffs; days after Flávio's own May visit to Trump, the administration announced the new tariff, per BBC Brasil on August 22. Marco Rubio posted on X on July 16: "Let there be no doubt about the reason: President Lula and his government did not negotiate with the US in good faith." New to these prices? Start with how a prediction market turns a question into a number; the Canada tariff market shows how fast a deadline moves one.
Then, on August 21, Lula called Trump: an hour and twenty minutes, at Lula's request, "friendly and cordial." Trump asked about the election and was told the process "is running well and reliably" ("corre bem e de forma confiável"); Trump "supported resuming negotiations," and Lula's aides said they doubt any relief comes before the vote, per G1 on August 21.
The Fight: A Banker's Audio, An AI Father, And 'Página Virada'
The crisis that flipped this market began on May 13, when The Intercept Brasil published audio of Flávio asking the banker Daniel Vorcaro for money for "Dark Horse," a film starring Jim Caviezel as Jair Bolsonaro. Vorcaro, whose Banco Master was liquidated in November 2025, is in jail. Per the BBC's account, Vorcaro agreed to about US$24 million (roughly R$134 million), and Flávio texted him "brother… I am and will always be with you" ("irmão… Estou e estarei contigo sempre"). Flávio says the real figure was "a little over US$12 million" ("pouco superior a US$ 12 milhões"), "100% proven," with no public money. Justice André Mendonça authorized a Federal Police inquiry, widened on July 24 to Eduardo's US expenses, per BBC Brasil on July 25. The price moved on it: Lula's Polymarket low was 36 cents to Flávio's 38 on April 24, per Poder360, the BBC's polling average dates Lula's runoff lead to May, "after the revelation of the link" between Flávio and Vorcaro, and by July 6 Lula was at 61, where he has sat since.
Flávio's answer on August 20 was "página virada," a closed chapter, though no public accounting exists and the producer's declared R$75 million budget lists no Vorcaro, per Brasil de Fato. On August 25 he told reporters, "It's not me who has to give an account, it's Lula" ("Não sou eu que tenho que prestar conta, é o Lula"), per G1.
The launch was its own record. At Pacaembu on July 25, Argentina's Javier Milei called Justice Moraes "bald trash" ("lixo careca") and part of the crowd left. An AI-generated Jair Bolsonaro told the stadium, "I am imprisoned and silenced by an arbitrary decision" ("Estou preso e calado por uma decisão arbitrária"), per G1. Moraes gave the defense 48 hours to say whether Jair had authorized the AI. After Flávio published his father's endorsement letter, Moraes barred him from visiting for 90 days, a bar still in place on August 21, per Fórum.
Lula carries his own weight: approval at 48% against 49% disapproval, and the field's highest share of voters who say they would never vote for him, 49% to Flávio's 48%, per Nexus/BTG on August 24. Both front-runners skipped the August 23 debate, "the emptiest since 1989," per the BBC. That Nexus poll has the first round 41 to 37 and the runoff 46 to 45. Datafolha, August 18 to 20, has it 47 to 43, per CartaCapital. A month ago Quaest had Lula up seven; every runoff number since August 9 is inside the margin of error.
What Moves The Price From Here
September 14, the second debate. The August 23 no-shows drew "no immediate punishment," per the AP Exata read in the BBC. Whether Lula and Flávio turn up, and what Flávio says about Vorcaro on a stage he cannot leave, is the first scheduled event either contract has to price.
The next Datafolha or Nexus runoff print. A move beyond three points either way breaks the tie. A Lula lead back near seven pushes his contract toward the mid-60s; a Flávio lead is a reading the price has never seen.
The Dark Horse inquiry. Justice Flávio Dino ordered the producer's data handed to the Federal Police on August 24. New documented findings push Flávio's contract down; a closed file lets "página virada" stand.
Washington. A tariff rollback before October would take the sovereignty frame off the table; a new tariff, or a public State Department move for Flávio, would put the July 2 letter back on the front page.
The first round is Sunday, October 4, 2026; if no one clears 50% of valid votes, the runoff is Sunday, October 25, 2026, and this one settles then.
Hero illustration: OddsShopper, in the house collage style. Luiz Inácio Lula da Silva photo by Palácio do Planalto from Brasilia, Brasil, licensed CC BY 2.0; photos cropped, toned, and composited. Prices quoted are live Kalshi market prices as of Tuesday, August 25, 2026, and will keep moving until this market settles after the Sunday, October 25, 2026 vote. Kalshi is a CFTC-regulated event-contract exchange (18+; availability varies by state). OddsShopper covers prediction markets as an independent analyst: any model or panel figures referenced are model estimates, not predictions of fact and not financial advice. This article does not advocate for or against any candidate or party. Trading involves risk; contracts can go to zero.
