Preview: USDBRL and Brazil's Presidential Runoff: Managing an Election Result Released While Markets Are Closed

Key takeaways

1. The dollar fell 0.97% to R$4.9896 on Friday, closing below R$5, as investors positioned for a Flávio Bolsonaro win (Reuters).

2. Polls close at 17:00 Brasília time (20:00 UTC) on Sunday 25 October, and the electoral court starts publishing official results at the same time (TSE).

3. When the market has already priced one outcome in a close race, the larger risk is the other outcome, and a stop order may be filled well beyond its level at the open.

The development

Brazil votes in a presidential runoff on Sunday 25 October between President Luiz Inácio Lula da Silva and Senator Flávio Bolsonaro. Final polls show a very close race. Datafolha gave the two candidates 50% each of valid votes in a poll released on Thursday evening (Reuters), and later polls showed narrow leads for Bolsonaro within their margins of error (Votendi).

Markets nevertheless leaned one way. On Friday the dollar fell 0.97% to R$4.9896, closing below R$5, and was down 1.64% on the week and 9.10% in 2026 (Reuters). A dealer told Reuters the market was betting on a Bolsonaro win, "however tight" (paraphrased from Portuguese). Valor reported increased demand for options to protect against an adverse result (Valor International).

Market transmission

Elections change the outlook for public finances, interest rates and capital flows at the same time. In Brazil the local curve, equities and the real tend to move together, so the currency carries the combined result. Fund managers surveyed by InfoMoney saw very different ranges depending on the winner: the dollar between R$4.00 and R$4.80 after a Bolsonaro win, and between R$5.30 and R$6.00 after a Lula win. These are their estimates, not forecasts by SummitFx.

The asymmetry matters. If one result is mostly priced, it may have only a modest effect, while the other result forces a larger repricing.

What to monitor next

• Official results from the electoral court from 20:00 UTC on Sunday, as ballot reports are counted (TSE). Polls and social-media claims are not results.

• Any concession or challenge from the losing candidate.

• Offshore USDBRL quotes before the Brazilian market opens on Monday. Liquidity is limited before Brazilian trading begins.

• The response of other Latin American currencies, such as the Mexican peso, to separate a Brazil-specific move from global dollar moves.

Reusable lesson

Before a weekend event, write down which outcome the market has priced and what each outcome would mean. Then size any position so that the less-priced outcome, with a price gap at the open, is a loss you can accept. Stop orders do not protect against gaps; they are filled at the first available price, which can be far from the stop level.

Invalidation and risk

A very narrow or disputed result could extend uncertainty for days. The global backdrop also matters: a hawkish Fed on Wednesday could strengthen the dollar against emerging-market currencies whatever the election outcome. The result was not available at research time and is not assumed in this note.

Glossary

Runoff: A second round of voting between the two leading candidates when no one wins a majority in the first round.

Gap risk: The risk that a price opens well away from its previous close, skipping over levels at which orders were placed.

Valid votes: Votes cast for a candidate, excluding blank and spoiled ballots; Brazilian polls usually report shares of valid votes.

Sources

Reuters (via UOL) (2026-10-23): Dólar cai abaixo dos R$5 com apostas de vitória de Flávio sobre Lula

Tribunal Superior Eleitoral (TSE) (2026-10-25): Divulgação dos resultados das Eleições 2026

Valor International (2026-10-23): Brazilian markets turn cautious as election race tightens

InfoMoney (2026-10 (publication date not shown)): De 'lua de mel' a 'piora intensa': como gestores veem a reação do mercado ao 2º turno

Votendi (2026-10-25): Brazil election 2026: 12 final polls and latest average

Disclaimer

This note is provided by the SummitFx Project for general education and market context only. It is not investment advice, not a solicitation to buy or sell any instrument, and not a personal recommendation. Foreign exchange and related markets are leveraged and can result in the loss of some or all of your capital. Figures are believed accurate at the time of research and may already be stale. Always verify live prices, official releases, and your own risk limits before acting. Past market behaviour does not determine future results.