PolitPro

Spain GESOP: election polls, forecast accuracy and deviations

GESOP: current voting intention polls in Spain

Last Poll July 9, 2026

View poll
Polling period: July 6, 2026 – July 9, 2026 Respondents: 1,001

Change from poll on January 15, 2026

PP
29.4
-0.6
26.5
±0.0
Vox
17.8
±0.0
7.7
-0.6
POD
4.0
-0.3
ERC
2.3
+0.1
2.0
+0.3
JxC
1.0
Other
9.3
+0.1

Previous polls by GESOP

Poll on Respondents PP PSOE Vox Sumar POD ERC SALF JxC Other View poll
January 15, 2026 1,002 30.0 26.5 17.8 8.3 4.3 2.2 1.7 9.2
October 9, 2025 1,000 29.0 27.8 18.4 8.0 3.7 2.0 1.6 1.0 8.5
June 12, 2025 1,002 30.5 27.0 16.0 7.5 3.8 1.7 2.0 1.2 10.3
March 6, 2025 1,000 32.1 27.0 14.6 7.5 3.3 1.8 2.5 1.4 9.8

GESOP at a glance

64 PolitPro Score Rank 12 of 16 in Spain
Score from 0 to 100 Avg. all polling institutes: 67.9
Avg. deviation in elections
1.8 pp

2 election comparisons

Recorded polls
20

Last on July 9, 2026

Deviations from the Election Trend

Party often overestimated Party often underestimated

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.

GESOP: which parties does it overstate and understate?

Significant from 20 % of polls
Vox
Deviates in both directions
25 % 40 %
At trend level
35 %
Polls
20
Partido Popular
Deviates in both directions
50 % 25 %
At trend level
25 %
Polls
20
PSOE
Often rated lower
45 % 15 %
At trend level
40 %
Polls
20
Sumar
Often rated lower
92 % 0 %
At trend level
8 %
Polls
12
EH Bildu
Too few polls
Fewer than 5 polls – no statement possible
At trend level
Polls
1

How are the data calculated?

The PolitPro Election Trend, which calculates a time-weighted average of current election polls, serves as a reference. A poll value is considered higher/lower if it is more than one percentage point higher/lower than the Election Trend.

GESOP: How accurate were its past election polls?

Accuracy in Elections 2.9 Percentage points deviation Significant Deviations Individual Parties: 2.1 to 4.3 percentage points
Last Election Parliamentary election in Spain 2023 Rank 10 of 10 institutes
Very Accurate Very Inaccurate
Parliamentary election in Spain 2019: 0.7, Parliamentary election in Spain 2023: 2.9
1 Very Reliable

In 1 elections, the pre-election poll was only slightly off the result.

0 Solid Results

In 0 elections, the pre-election poll deviated moderately from the result on average.

1 Significant Deviations

In 1 elections, pre-election polls and results differed significantly.

0 Very Large Deviations

In 0 elections, the pre-election poll significantly missed the result.

2 elections compared with GESOP · Select point for details, tap category to highlight.

How do we calculate accuracy in elections?

Accuracy shows how close pre-election polls were to the actual election result. We compare the pre-election polls of the institutes with the actual result of an election. We compare the average deviation of the parties' values and form an average from them. In the calculation, we consider all parties with an election result of 3% and higher. Election polls have a margin of error of 2-3 percentage points. We rate average deviations of up to one percentage point as very good (green), and up to 2 percentage points as good (yellow). Values up to 3 percentage points deviation are rated as ok (orange), but already show significant outliers for some parties. Average deviations of more than three percentage points indicate deficiencies in accuracy and significance and are rated as bad (red).

More from PolitPro

Data & Feedback

Political data changes daily. Noticed outdated info, a number, or a date? Write to us – preferably with a source, so we can quickly verify the change.

Support PolitPro

Your support protects PolitPro from the influence of lobby groups and parties.

Data Basis & Transparency

PolitPro

PolitPro combines scientific data and current poll values to make politics tangible for everyone. We use datasets from leading research projects and supplement them with our own research, analyses, and algorithms. This way, we make complex political contexts understandable and accessible to all. Supported by AI.