# Will PL win the 2026 Brazilian Chamber of Deputies elections

> Closed. Last odds frozen 8 d ago — final outcome on the venue.

URL: https://simplefunctions.dev/odds/brdep
Updated: 2026-09-11T19:20:52.836Z
Category: general · Topic: election-2026
Status: historical
Closes: 2027-10-04

## Headline

- Probability: 48% (liquidity-weighted across 2 contracts)
- Venue: Kalshi (2 contracts)
- 24h volume: $270

## Bound contracts (2)

| Outcome | Price | 24h | Volume | Venue | Slug |
|---|---|---|---|---|---|
| PL | 61¢ | +1pp | $270 | kalshi | /markets/will-pl-win-the-2026-brazilian-chamber-of-deputies-kalshi-kxbrdep-26oct04-pl |
| União Progressista | 34¢ | −2pp | $0 | kalshi | /markets/will-unio-progressista-win-the-2026-brazilian-cham-kalshi-kxbrdep-26oct04-upro |

## 30-day trajectory

| Day | Aggregate |
|---|---|
| 2026-08-22 | 32 |
| 2026-09-06 | 36 |
| 2026-09-10 | 48 |

_18 days of price history captured. Each row is the daily mean of intraday 5-min captures._

## Analysis

The market is pricing a 44% chance that Brazil's Liberal Party (PL) will win the most seats in the 2026 Chamber of Deputies elections. This reflects uncertainty about whether the center-right opposition can consolidate enough support to gain congressional plurality against President Lula's coalition. The probability hinges on current polling trends, fragmentation across competing parties, and alignment decisions by coalition partners before the October 2026 election. The elections themselves on October 4, 2026 will definitively settle this outcome. Recent economic conditions and approval ratings for both the government and opposition influence how voters may shift support over the coming months.

### Key factors

- Current polling data showing PL's relative strength compared to other major parties like União Progressista, PT, and MDB
- Historical fragmentation patterns in Brazilian congressional elections and whether voters consolidate around major opposition brands
- Coalition-building dynamics and whether smaller parties align with PL or distribute support across competing center-right alternatives
- Government approval ratings and economic conditions between now and October 2026, which typically influence mid-term congressional performance
- Electoral rule structure and threshold effects that determine which parties achieve plurality status with the seats they win

## Methodology

Probability is **liquidity-weighted** across all bound Kalshi/Polymarket contracts: Σ(price × volume) ÷ Σ(volume). 30-day trajectory uses the daily mean of intraday 5-min captures. 24h delta = today's mean − yesterday's mean. Movement events are ≥3pp daily moves in the last 7 days.

## How to use this data

- HTML: https://simplefunctions.dev/odds/brdep
- JSON: https://simplefunctions.dev/api/public/odds?slug=brdep
- Topic hub: https://simplefunctions.dev/predictions/election-2026

## License

CC-BY-4.0. Attribute "SimpleFunctions" with a link to https://simplefunctions.dev. See https://simplefunctions.dev/legal for terms.