Dual Citizenship in Spain: Complete Guide 2026

Does Spain allow dual citizenship? The answer is nuanced and depends entirely on your country of origin. Spain has formal dual nationality conventions with a specific group of countries, primarily Ibero-American nations and a handful of others. For nationals of countries outside these conventions, Spain requires formal renunciation of your previous nationality at the oath ceremony. Elena Mochales (ICAM C69993), a Spanish immigration lawyer with 25 years of experience, explains the complete rules on dual nationality in Spain.

Countries with Dual Citizenship Conventions

Spain maintains formal dual nationality conventions with the following countries. Nationals of these countries may hold both their original citizenship and Spanish citizenship simultaneously without renouncing either:

What Happens If Your Country Is Not on the List?

If you are a national of the United States, United Kingdom, Canada, Australia, India, China, Morocco, or any other country not listed above, Spain requires you to formally renounce your previous nationality at the jura de nacionalidad (oath ceremony). You must declare before the Civil Registry judge or Notary Public that you renounce your prior citizenship.

However, this renunciation is not always recognized by your home country. For example:

• United States: The US does not recognize foreign renunciations unless done through a specific US State Department procedure. An American who “renounces” at the Spanish jura remains a US citizen in the eyes of US law.
• United Kingdom: The UK permits dual citizenship and does not require any renunciation. A British citizen who renounces at the Spanish jura remains British under UK law.
• Canada: Canada fully permits multiple citizenships. The Spanish renunciation has no effect under Canadian law.

This creates a situation of de facto dual citizenship: Spain considers you solely Spanish, while your home country still considers you its citizen.

Risks and Considerations

• Using your original passport after the jura: Spain expects you to use only your Spanish passport. Using your previous nationality’s passport for travel or official purposes could be interpreted as “exclusive use of prior nationality” and may trigger a review of your Spanish citizenship.
• Tax implications: Spanish citizens are tax residents if they spend 183+ days per year in Spain. Citizenship itself does not create new tax obligations — tax residency is based on physical presence, not nationality.
• Military service: If your home country has mandatory military service, check whether Spanish citizenship affects your obligations.

Frequently Asked Questions

Does Spain allow dual citizenship with the United States?

Spain and the United States do not have a formal dual nationality convention. A US citizen must formally renounce US nationality at the Spanish jura ceremony. However, the US does not automatically recognize this renunciation. You remain a US citizen under US law while Spain considers you solely Spanish. This is de facto dual citizenship, but it carries legal complexities you should discuss with an immigration lawyer.

Can British citizens hold dual Spanish citizenship?

Spain requires formal renunciation of British nationality, but the United Kingdom does not recognize this renunciation. British citizens who become Spanish remain British under UK law. De facto dual citizenship applies, with the same caveats about exclusive use of the Spanish passport.

Will my children be dual citizens?

Yes. Children born after you acquire Spanish citizenship are Spanish by origin and may also acquire your other nationality through descent, creating formal dual citizenship from birth.

Can I lose Spanish citizenship if Spain discovers my other nationality?

Citizens by origin (españoles de origen) cannot lose Spanish nationality. Citizens by residence who acquired nationality through the standard process could potentially face review if they use their prior nationality exclusively for 3 years without declaring intention to conserve Spanish nationality (Código Civil Art. 24-25).

Consult Elena Mochales (ICAM C69993) before applying for Spanish citizenship to understand how dual nationality rules affect your specific situation. Free initial consultation available.

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