Dual Citizenship: Which Countries Allow It and Which Force You to Choose

Why Dual Citizenship Matters

For globally mobile professionals, dual citizenship provides visa-free travel benefits, the right to live and work in multiple countries, political stability insurance, tax planning flexibility, and emotional connection to multiple homelands. But dual citizenship policies vary enormously — some countries actively encourage it, while others force you to renounce your original nationality.

Countries That Freely Allow Dual Citizenship

These countries have no restrictions on holding multiple citizenships:

• United States: Allows dual citizenship without restriction, though all US citizens must file taxes worldwide
• United Kingdom: No restrictions. British citizens can hold as many citizenships as they acquire
• Canada: Allows dual citizenship. No requirement to reside in Canada to maintain citizenship
• France: No restrictions. French citizenship cannot be involuntarily revoked due to acquiring another nationality
• Italy: Allows dual citizenship. Italy also offers citizenship by descent (jure sanguinis) to those with Italian ancestors
• Portugal: Allows dual citizenship. Relatively accessible naturalization after 5 years of residency
• Australia: Allows dual citizenship since 2002 (previously prohibited)
• Ireland: Allows dual citizenship. Irish citizenship through grandparent descent is available
• Sweden: Allows dual citizenship since 2001
• Switzerland: Allows dual citizenship since 1992

Countries That Prohibit or Restrict Dual Citizenship

• China: Strictly prohibits. Acquiring foreign citizenship automatically results in loss of Chinese citizenship
• India: Does not allow dual citizenship, but offers Overseas Citizen of India (OCI) card as an alternative — a long-term visa with most rights except voting and government employment
• Japan: Technically requires choosing one citizenship by age 22 (or within 2 years of acquiring dual citizenship). Enforcement has historically been lax, but the law remains
• South Korea: Generally requires renunciation, but allows limited dual citizenship for certain categories (Korean males who complete military service, elderly returnees, exceptional talent)
• Singapore: Strict prohibition for male citizens who have not completed National Service. Others may face citizenship revocation if they acquire foreign citizenship
• UAE: Does not recognize dual citizenship for Emirati citizens
• Saudi Arabia: Prohibits dual citizenship
• Netherlands: Generally requires renunciation of original citizenship when naturalizing (with exceptions for those from countries that do not allow renunciation, spouses of Dutch citizens, and EU/EEA nationals)
• Austria: Generally prohibits without prior permission, which is rarely granted

Countries With Conditional Dual Citizenship

• Germany: EU/EEA citizens can maintain dual citizenship. Others must generally renounce, but exceptions exist for cases of hardship or where renunciation is impossible/unreasonable
• Spain: Allows dual citizenship with certain countries (most Latin American nations, Portugal, Philippines, Andorra, Equatorial Guinea) through bilateral treaties. Others must renounce
• Norway: Allows dual citizenship since 2020 (a recent change)

Citizenship by Descent

Several countries offer citizenship to descendants of their nationals, potentially going back several generations:

• Italy: Citizenship by descent (jure sanguinis) with no generational limit if unbroken male lineage (or female lineage after 1948)
• Ireland: Citizenship through grandparent registration. Great-grandparent routes may be possible through parent registration
• Poland: Citizenship confirmed (not granted) for those who can prove continuous Polish citizenship through ancestors
• Hungary: Simplified naturalization for those with Hungarian ancestry and basic Hungarian language skills
• Portugal: Citizenship available to descendants of Sephardic Jews through a special naturalization process

Practical Considerations

Even where dual citizenship is legal, practical complications can arise around which passport to use when entering/leaving each country, tax obligations in both countries, military service obligations, security clearance implications, and banking and financial reporting requirements (particularly for US citizens under FATCA).

Understanding your options for dual citizenship is particularly relevant when choosing a relocation destination. Analyze the tax implications of citizenship in different countries. Explore destinations that align with your citizenship goals.