The Spanish general elections on Sunday, 29 November 2026, will allow eligible voters in Ibiza to choose their representatives in the Congress of Deputies and the Senate. Although the voting process may appear straightforward, understanding how ballots are counted, how electoral tables operate and how votes are converted into parliamentary seats is important for interpreting the results.

There are several particularities for voters in Ibiza and Formentera, especially when it comes to the difference between the two parliamentary chambers. While both islands vote together within the Balearic Islands constituency for Congress, they form a separate joint island constituency for the Senate.

The following guide explains the main stages of the electoral process, the different types of votes, the responsibilities of electoral officials and how the Spanish electoral system determines parliamentary representation.

What Is the Difference Between a Blank Vote and a Null Vote?

One of the most common questions during an election concerns the difference between voting blank and casting a null vote. Although both may result in a ballot that does not support a political party or candidate, they have different legal consequences.

A blank vote is considered valid. For Congress, it occurs when a voter places an empty official envelope into the ballot box without a ballot paper. In Senate elections, a ballot paper on which no candidates have been selected is also considered a blank vote.

A null vote, by contrast, is invalid because the ballot or envelope does not comply with the electoral rules. Examples include placing a ballot paper into the box without an envelope, using a non-official envelope or ballot paper, including ballot papers from different candidacies in the same envelope, or altering a ballot in a way that makes it invalid under electoral legislation.

There is an important distinction when an envelope contains multiple ballot papers from the same candidacy: this is counted as one valid vote rather than a null vote.

Blank votes are included in the total number of valid votes, while null votes are excluded from that figure. However, both are included when calculating the number of votes cast for participation statistics.

What Counts as a Valid Vote and What Is Abstention?

Voting in Spain is a right rather than a legal obligation. Eligible citizens can participate in the election or choose not to vote.

The votes deposited in the ballot boxes are classified as valid or null. Valid votes include ballots cast for a political candidacy and blank votes. Null votes are those that fail to meet the legal requirements.

Abstention refers to registered voters who do not cast a ballot. It is therefore different from both a blank vote and a null vote.

These distinctions are important when analysing election results. A high number of blank votes, for example, does not mean the same thing as a high level of abstention, because blank votes are still included in the valid vote total.

What Is the Electoral Register and How Is a Polling Station Assigned?

The electoral register is the official record of people entitled to vote in a particular election. It is managed by the Electoral Census Office, which operates within the National Statistics Institute (INE).

For the 29 November 2026 general elections, the electoral register was closed on 1 August 2026. This is the register used to determine which citizens are eligible to vote and where they are assigned to cast their ballots.

Each voter is allocated to an electoral section and a specific polling table within that area. The assignment determines the polling station where the individual must vote.

The INE provides an online service through which voters can check their census information, including their assigned polling place and table. The census card sent to voters also provides information about the location where they are registered to vote.

How Are Electoral Tables Formed and Who Supervises Voting?

Electoral tables are responsible for overseeing the voting process and carrying out the initial count once polling ends.

Each table consists of three members:

• One president.

• Two members, known as vocales.

The members are selected by lottery from among eligible registered voters in the relevant electoral section. The president and members are responsible for ensuring that voting takes place according to the established rules.

Electoral tables operate in designated polling locations, generally in public buildings. These premises must also meet accessibility requirements so that people with disabilities can exercise their right to vote.

Their responsibilities include checking voter identification, receiving ballots, supervising the voting process, resolving procedural issues and carrying out the provisional count after the polling station closes.

What Is the Difference Between an Electoral Interventor and an Apoderado?

Political parties and candidates can appoint representatives to monitor the electoral process. Two important roles are the interventor and the apoderado electoral.

An interventor is assigned to a specific electoral table. This representative can observe its proceedings, participate in discussions with the right to speak but not vote, submit complaints and raise objections about the conduct of the election. Interventors can also request official certificates relating to the proceedings.

An apoderado has a different role. Rather than being attached to one particular table, this representative can move between different polling locations to observe the voting and counting process. Apoderados do not form part of the electoral table and cannot participate in its deliberations, but they can also raise complaints and objections.

Both positions allow political candidacies to monitor the election and report potential irregularities.

Which Institutions Control the Electoral Process?

The Spanish electoral administration is responsible for ensuring transparency, objectivity and equal treatment throughout the electoral process.

It is made up of several bodies:

• Central Electoral Commission (Junta Electoral Central).

• Provincial Electoral Commissions (Juntas Electorales Provinciales).

• Electoral Zone Commissions (Juntas Electorales de Zona).

• Autonomous Community Electoral Commissions, where applicable.

• Electoral tables.

These bodies have different responsibilities depending on the stage and geographical scope of the election.

For general elections to the Congress and Senate, the Provincial Electoral Commissions play an important role in matters such as the presentation and proclamation of candidates and the definitive scrutiny of results.

The Central Electoral Commission provides the highest level of electoral supervision and helps establish consistent interpretations of electoral legislation.

When Are Votes Counted? Provisional and Definitive Scrutiny

The counting of votes takes place in two distinct stages.

The provisional count begins immediately after voting ends at each polling station. The president opens the ballot box and removes the envelopes one by one, announcing the result of each ballot aloud. The ballot papers are shown to the other members of the table and to the authorised party representatives.

Once the count is completed, the table resolves any questions or objections and announces the provisional results. These figures are recorded in the official count record.

The definitive scrutiny takes place later, under the supervision of the Provincial Electoral Commissions. For the 29 November 2026 general elections, the official schedule sets this process between 4 and 7 December.

The provisional figures announced on election night should therefore be distinguished from the definitive results established through the formal scrutiny process.

What Is the Electoral Count Record and What Does It Contain?

After counting the ballots, each electoral table prepares an official record known as the acta de escrutinio.

This document records the results obtained at that particular table, including:

• The number of voters who participated.

• The number of valid votes.

• The number of blank votes.

• The number of null votes.

• The votes received by each political candidacy.

The record is signed by the members of the electoral table. Copies can be provided to authorised representatives of the candidacies and other people entitled to receive them under electoral regulations.

The document provides a formal record of the provisional results at each polling station and forms part of the wider process used to establish the definitive election results.

How Does Postal Voting Work in the General Elections?

Spanish voters who cannot attend their assigned polling station can use postal voting instead.

Within Spain, the procedure is managed through Correos. Voters must request postal voting within the official application period and receive the electoral documentation at the address they have provided.

For the 29 November elections, the application period runs from 6 October to 19 November 2026. The deadline for depositing the completed vote at a Correos office is 25 November.

A particularly important rule is that once a voter has requested postal voting, they cannot subsequently attend their polling station to vote in person. The postal voting procedure must be completed through the designated system.

The process also applies to Spanish citizens living abroad, although different arrangements exist depending on whether their stay outside Spain is temporary or permanent.

What Is ERTA Voting for Spaniards Temporarily Abroad?

ERTA refers to the electoral procedure for Spanish citizens who are temporarily outside Spain during an election period.

These voters must apply through the relevant Spanish consulate or embassy and follow the procedure established for temporary residents abroad.

The application period for the 29 November 2026 elections ran from 6 to 31 October. Once the documentation is received, the voter must return the completed ballot through the designated postal procedure within the applicable deadline.

This system is different from postal voting requested by someone who is physically in Spain but unable to attend their polling station.

What Is CERA Voting for Spaniards Permanently Living Abroad?

CERA refers to the electoral census of Spanish citizens who reside permanently outside Spain.

Spanish citizens registered in this census can participate in general elections, regional elections and elections to the European Parliament, subject to the rules applicable to each election.

For the 29 November general elections, voters registered in CERA can send their vote by post to the relevant consulate or deposit it in person at an authorised diplomatic or consular location during the designated period.

The voting arrangements are different from those for Spanish citizens who are temporarily abroad. The distinction depends on the voter's registered residence status.

How Are Members of Congress Elected in Ibiza?

Spain is divided into 52 electoral constituencies for elections to the Congress of Deputies. These correspond to the 50 provinces and the autonomous cities of Ceuta and Melilla.

Each province receives an initial allocation of two deputies, while Ceuta and Melilla each elect one. The remaining seats are distributed between the provinces according to their population.

Ibiza does not have a separate constituency for the Congress. Voters on the island participate within the provincial constituency of the Balearic Islands.

Political parties present closed and blocked lists of candidates. This means voters choose a party's ballot paper rather than selecting individual candidates or changing the order in which they appear.

The total number of members in the Congress is 350.

Why Do Ibiza and Formentera Have a Separate Constituency for the Senate?

The electoral system for the Senate is different from the one used for the Congress.

For Senate elections, Spain uses territorial constituencies that take account of the country's provincial and island structure. In the Balearic Islands, Mallorca elects three senators, Menorca elects one, and Ibiza and Formentera jointly elect one senator.

Unlike the Congress, where voters select a political party's closed list, Senate voters select individual candidates from the ballot paper.

In the Ibiza-Formentera constituency, voters can select a maximum of one candidate. The candidate receiving the most votes is elected.

This distinction means that voters in Ibiza receive two different ballot papers during the general elections: one for the Congress and another for the Senate.

The Senate also includes members designated by the autonomous communities, in addition to those elected directly by voters.

How Do Electoral Constituencies Work in Other Spanish Elections?

The territorial organisation of elections changes depending on the institution being elected.

For Congress, the provinces and autonomous cities are the electoral constituencies. For the Senate, the system also takes account of individual islands and island groups.

Regional elections are governed by the electoral rules of each autonomous community. In the Balearic Islands, the islands have their own electoral constituencies for the regional parliament.

For municipal elections, each municipality normally constitutes its own electoral constituency.

European Parliament elections use a single constituency covering the whole of Spain, meaning voters across the country participate in the same national electoral process.

These differences explain why the geographical distribution of seats is not identical across all Spanish elections.

How Are Votes Converted Into Parliamentary Seats?

The electoral system determines how the votes received by political parties and candidates are transformed into parliamentary representation.

For elections to the Congress of Deputies, Spain uses the D'Hondt method to distribute seats within each constituency. This is a proportional allocation formula that divides the votes received by each eligible political candidacy by a sequence of numbers and allocates seats according to the highest resulting figures.

The number of seats available in each constituency and the electoral threshold also influence the final distribution.

The Senate uses a different system. Voters select individual candidates, and the seats are allocated according to the candidates' results rather than through the D'Hondt formula.

What Percentage of Votes Does a Party Need to Win Seats?

An electoral threshold is the minimum percentage of votes a political candidacy must obtain to participate in the allocation of seats.

For elections to the Spanish Congress, the threshold is 3% of valid votes in the relevant constituency. This calculation includes blank votes but excludes null votes.

The threshold is different for municipal elections, where the general requirement is 5% of valid votes, while regional elections follow the rules established by the relevant autonomous community.

The threshold is only one part of the electoral system. The number of seats available in each constituency, the distribution of votes between parties and the allocation formula also determine how parliamentary representation is established.

What Voters in Ibiza Should Remember for 29 November

The general elections will take place on Sunday, 29 November 2026. Polling stations are scheduled to open at 09:00 and close at 20:00.

Voters should check their electoral registration and assigned polling location before election day. They should also remember that the Congress and Senate ballots follow different rules, particularly in Ibiza and Formentera, where the two islands elect one senator together.

The electoral process includes more than casting a ballot. The work of polling tables, the distinction between valid and null votes, the provisional count and the definitive scrutiny all form part of the system that determines the final composition of Spain's Parliament.