Spain’s government works as a parliamentary constitutional monarchy: the King is head of state but performs a ceremonial role, while real political power rests with an elected two-chamber parliament that chooses and can remove the Prime Minister. An independent judiciary interprets the law, a separate Constitutional Court guards the 1978 Constitution, and 17 Autonomous Communities run much of daily governance in their own territories. The system was built after decades of dictatorship, and it was designed to spread authority rather than concentrate it.
The King’s Role Is Ceremonial
The King is head of state and, in the words of the Constitution, “the symbol of its unity and permanence.”1La Moncloa. Part II The Crown He signs laws, nominates a candidate for Prime Minister, and represents Spain abroad. None of those acts express his personal choice. Every official act the King performs must be countersigned by the Prime Minister or the relevant minister, and without that signature the act has no legal force.2Spanish Senate. Spanish Constitution The countersigning minister carries the legal responsibility. The King himself is constitutionally inviolable.
He also holds the title of supreme commander of the armed forces, but that title is honorary. Actual command of the military rests with the Prime Minister and the Minister of Defense.
Parliament: The Cortes Generales
Legislative power belongs to the Cortes Generales, Spain’s bicameral parliament. It represents the Spanish people, passes laws, approves the national budget, and oversees the executive.3La Moncloa. Part III The Cortes Generales The two chambers usually work separately, with most bills starting in the lower house and moving to the upper house for a second reading.4Spanish Senate. Parliament (Cortes Generales)
The Congress of Deputies
The Congress of Deputies is the more powerful chamber. It currently has 350 members, a figure set by the 1985 Organic Act on the General Electoral Regime; the Constitution allows anywhere from 300 to 400.5Congreso de los Diputados. Functions of the Congress of Deputies Deputies are elected by proportional representation in 52 constituencies covering Spain’s 50 provinces plus the autonomous cities of Ceuta and Melilla. Each province gets a minimum number of seats, and the rest are allocated by population. A party has to clear 3 percent of the vote in a constituency to win any seats there.6European Parliament. Factsheet ES Congress of Deputies
The Congress holds the decisive role in almost every important function. It alone conducts the investiture vote that installs a new Prime Minister, it alone can remove one through a motion of censure, and its version of a bill prevails in most disagreements with the Senate.
The Senate
The Senate is the chamber of territorial representation. In the current 15th legislature it has 266 members.7Spanish Senate. Composition of the Senate Most senators are directly elected: four per mainland province, with different allocations for the islands, Ceuta, and Melilla. The rest are appointed by the parliaments of the Autonomous Communities, which get one senator each plus an additional senator for every million inhabitants.3La Moncloa. Part III The Cortes Generales Because that population-based share can shift, the total number of senators is not permanently fixed.
How a Bill Becomes Law
A bill typically clears committee and plenary debate in the Congress first, then passes to the Senate. The Senate can propose amendments or veto the text outright, but the Congress can override that veto by absolute majority, or by simple majority after two months. Once both chambers approve the final text, the King signs and promulgates the law. The Constitution requires the Prime Minister or the relevant minister to countersign the royal sanction, which is what makes the executive politically responsible for the legislation.1La Moncloa. Part II The Crown
How Spaniards Elect Their Government
Both chambers of the Cortes Generales serve four-year terms, though the Prime Minister can dissolve parliament and call early elections at any point.3La Moncloa. Part III The Cortes Generales Every Spanish citizen aged 18 or older on election day can vote. Citizens living abroad vote after registering at the relevant Spanish consulate.
Congress seats are allocated using the D’Hondt method of proportional representation, which tends to favor larger parties, particularly in smaller provinces where only a handful of seats are at stake. Together with the 3 percent constituency threshold, this has historically concentrated power in two major national parties while leaving room for regional parties to win in their home territories.6European Parliament. Factsheet ES Congress of Deputies
The two parties that have alternated in leading governments since the transition to democracy are the center-left Spanish Socialist Workers’ Party (PSOE) and the center-right Popular Party (PP). Since the mid-2010s, newer parties have fragmented that pattern, and coalition or minority governments have become the norm. Regional parties from Catalonia, the Basque Country, the Canary Islands, and Galicia regularly hold seats in the Cortes and sometimes play kingmaker roles in forming a government.
The Prime Minister and the Council of Ministers
Executive power belongs to the Government of Spain, led by the President of the Government (commonly translated as Prime Minister), together with one or more Deputy Prime Ministers and the Council of Ministers.8La Moncloa. Institutions of Spain The Government sets domestic and foreign policy, commands the civil and military administration, and drafts the annual budget for parliament to approve. The Council of Ministers is the main collective decision-making body, and it is where draft laws and regulatory decrees get approved before moving on.
Becoming Prime Minister
After a general election or a vacancy, the King consults parliamentary leaders and proposes a candidate for Prime Minister. That candidate is usually the leader of the party or coalition with the strongest support in the Congress. The nominee then appears before the Congress, presents a governing program, and asks for its confidence. On the first vote, an absolute majority is needed: 176 of 350 deputies. If that vote fails, a second one is held 48 hours later, and a simple majority is enough.9La Moncloa. Pedro Sánchez is sworn in as President of the Government of Spain with an absolute majority If no candidate wins confidence within two months of the first vote, the King dissolves parliament and new elections are called. This is where Spanish coalition politics get intense, with parties negotiating for weeks to secure support or strategic abstentions from regional parties.
Removing a Prime Minister
Spain uses a constructive vote of no confidence, modeled on the German system. At least 35 deputies, one-tenth of the Congress, have to sign the motion, and it must name a specific alternative candidate for Prime Minister. If the motion passes by absolute majority, the sitting Prime Minister is immediately removed and the alternative candidate is sworn in. The design makes it deliberately hard to topple a government without a replacement lined up. That promotes stability, at the cost of making it harder for the opposition to force change.
The Courts and the Constitution
Judges and magistrates in Spain are independent and subject only to the rule of law. The regular court system is arranged in a hierarchy that runs from local courts up to the Supreme Court in Madrid, which is the highest authority in civil, criminal, administrative, and labor matters. Its rulings are final except where constitutional rights are at issue.10Poder Judicial. What is the Supreme Court?
The judiciary is governed by the General Council of the Judiciary (CGPJ), which oversees appointments, promotions, transfers, and discipline of judges. It has 21 members: the President of the Supreme Court plus 20 members appointed by parliament, 12 of them judges and 8 other legal professionals such as prosecutors, law professors, or practicing attorneys.11ENCJ. Spain – Consejo General del Poder Judicial (CGPJ) The fact that all 20 appointed members are chosen by parliament rather than by fellow judges has been a recurring source of political controversy, with critics arguing it hands the major parties too much sway over the judiciary.
The Constitutional Court
Separate from the regular judiciary, the Constitutional Court is the final authority on whether laws and government acts comply with the Constitution. It has 12 members: four nominated by the Congress by a three-fifths supermajority, four by the Senate under the same rule, two by the Government, and two by the CGPJ. Members serve nine-year terms, and the Court is renewed by thirds every three years.12La Moncloa. Part IX The Constitutional Court
The Court reviews the constitutionality of laws, resolves jurisdictional conflicts between the central government and the Autonomous Communities, and hears individual appeals when citizens believe their fundamental rights have been violated. Its decisions bind all courts and public authorities. Because of its role refereeing between Madrid and the regions, it regularly ends up at the center of Spain’s most politically charged disputes.
The Autonomous Communities
Spain’s territorial organization is one of the most decentralized in Europe. The 1978 Constitution set up a framework in which 17 Autonomous Communities and two autonomous cities, Ceuta and Melilla, exercise significant self-government.8La Moncloa. Institutions of Spain Each community has its own elected parliament, government, and president, mirroring the national structure. Communities hold substantial authority over education, healthcare, policing, housing, regional transport, and other domestic services, and they can pass their own legislation in those areas.
The central government keeps exclusive control over defense, foreign affairs, customs, immigration, and the basic framework of economic regulation. Between those two poles sits a wide gray zone of shared or contested powers, which is why the Constitutional Court spends so much time refereeing.
How the Regions Are Funded
Most Autonomous Communities are funded through a common financing system. The central government collects the major taxes and redistributes revenue by population, need, and other criteria, while communities set the rates for certain taxes delegated to them. The Basque Country and Navarre are different. They collect nearly all taxes themselves through their own treasuries under historic arrangements known as the Economic Agreement (Basque Country) and the Economic Convention (Navarre), then remit an agreed share to the central government for nationally provided services.13Tax Agency. Joint Tax System with the Basque Country That gives them far more fiscal independence than other communities, and it remains a contentious point in Spanish politics.
Because communities set some tax rates, the tax on personal income, property transfers, and inheritance can vary meaningfully depending on where you live. Property transfer taxes on resale homes, for instance, range from roughly 6 percent to 10 percent depending on the community, with reduced rates sometimes available for first-time buyers or younger purchasers.