PolitPro

Switzerland Sotomo: Election Poll for Switzerland's Parliamentary Election, September 11, 2025

Strongest Force
11.6 points ahead of SP/PS
Government Majority
Stable Majority
162 of 200 seats in the Election Trend
Election year
2027
estimated

Switzerland: Voting Intention Poll for Parliamentary Election

The bars show the results of this single poll; the chips show the change compared to the last election. Single poll by Sotomo: for Switzerland's Parliamentary election, fieldwork concluded September 11, 2025.

Changes since the last election on October 22, 2023

SVP
30.4
+2.5
SP
18.8
+0.5
DM
13.6
-0.5
FDP
13.3
-1.0
G
10.3
+0.5
GLP
6.1
-1.5
EVP
1.5
-0.5
Other
6.0
Institute
Sotomo
Client
N/A
Survey Period
August 25, 2025 – September 11, 2025
Respondents
32,147
Switzerland's governing coalition holds a stable majority.

Based on this poll, the parties currently in government would win 81.0% of the parliamentary seats.

Who is leading according to the poll by Sotomo?

In the latest voting intention poll for Switzerland by Sotomo, SVP/UDC leads with 30.4%. Trailing are SP/PS with 18.8%, DM/LC with 13.6%, FDP/PLR with 13.3%, G/LV with 10.3%, GLP/PVL with 6.1% and EVP/PEV with 1.5%. Other parties achieve 6% of the votes.

What do the symbols mean?

To make parties comparable, we indicate their political orientation with symbols. These categories provide a rough classification for a quick overview. More detailed information on political stances can be found on the parties' subpages.

  • Far-Left
  • Left
  • Centre-Left
  • Center
  • Transversal
  • Unknown
  • Centre-Right
  • Right
  • Far-Right
  • Liberal
  • Environment & Climate
  • Regional
  • Animal Welfare
  • Satire

Seat projection based on this poll

Sotomo: how reliable is the projection?

92 PolitPro Score Rank 1 of 2 in Switzerland
Score from 0 to 100 Avg. all polling institutes: 83.5
Avg. deviation in elections
0.6 pp

3 election comparisons

Recorded polls
9

Last on September 11, 2025

Deviations from the Election Trend

Party often overestimated Party often underestimated

No significant deviations from the Election Trend

What is the PolitPro Score for polling institutes?

In the PolitPro Score for polling institutes, we assess the reliability of polling institutes based on their accuracy in elections and their deviation from the Election Trend. Significant deviations in party values compared to the Election Trend lead to deductions, as they can indicate favoritism or disadvantage for parties. The score has a maximum value of 100.

Coalition calculator: majorities based on this poll

0
101
0 200
Majority 101

Parties

Select parties to test coalitions.

PolitPro Analysis

Probability of an Absolute Majority

  1. SVP
    0%
  2. SP
    0%
  3. DM
    0%

Probability of Election Victory

  1. SVP
    100%
  2. SP
    <1%
  3. DM
    <1%
  4. FDP
    <1%

Probability of Entering Parliament

How does the PolitPro Analysis work?

Election polls are not predictions, but snapshots with statistical fluctuations. To obtain a realistic picture, we daily simulate 100,000 election outcomes based on the PolitPro Election Trend using the 'Monte Carlo method'. In doing so, we include typical voter migration and political trends. Our algorithm tests various scenarios – from small shifts within camps to political surprises – to determine the actual chances of success for parties and coalitions.

Sotomo: Projected composition of parliament

This poll indicates 7 parties would clear Switzerland's electoral threshold and enter parliament: SVP/UDC with 65 seats, SP/PS with 40 seats, DM/LC with 29 seats, FDP/PLR with 28 seats, G/LV with 22 seats, GLP/PVL with 13 seats and EVP/PEV with 3 seats.

Switzerland's Electoral System Explained

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Electoral Threshold and Hurdles

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Government formation and coalition traditions

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