Dual Citizenship Rules by Country: Who Allows It, Who Doesn't (2026)

Dual citizenship persists as a cornerstone of modern global mobility, with approximately 75% of sovereign states globally permitting some form of multiple nationality as of 2026. While most Western nations, including many providing Citizenship by Investment (CBI) programmes, fully embrace the concept, others in Asia and the Middle East continue to enforce strict single-citizenship policies.

Key Takeaways

• Global Standard: Over 150 countries now acknowledge dual citizenship, seeing it as a tool for economic engagement and diaspora management.
• CBI Leaders: Key investment-migration hubs like St Kitts and Nevis, Malta, and Grenada remain unequivocally supportive of multiple nationality.
• Strict Prohibitions: Nations such as Mainland China, Singapore, and Japan generally enforce a 'one nationality' rule, requiring the renunciation of prior citizenships.
• Hybrid Systems: Certain countries permit dual nationality only with specific treaty partners or based on birthright (jus sanguinis) rather than naturalisation.
• Tax Implications: Holding multiple passports can trigger complex tax reporting requirements, particularly for US citizens who are taxed on global income regardless of residence.

Why is dual citizenship rising in 2026?

In the current geopolitical landscape, the demand for 'Plan B' citizenships has surged. Global volatility and the rise of remote work have driven High-Net-Worth Individuals (HNWIs) to seek portfolios of nationalities that offer greater travel freedom and tax efficiency. The World Bank notes that countries permitting dual citizenship often see higher levels of foreign direct investment, as dual nationals act as bridges between economies.

Which countries permit dual citizenship without restrictions?

Most Western democracies allow citizens to hold another nationality without losing their original status. In these jurisdictions, the process is automatic; you do not need to ask permission from the government to acquire a second passport.

The Americas

In the United States, the government does not require a person to choose between one nationality and another. While the Oath of Allegiance mentions renouncing 'fidelity' to foreign potentates, US Supreme Court rulings have protected the right to hold multiple passports. Canada, similarly, has allowed dual citizenship since 1977. In Latin America, countries like Brazil, Argentina (where citizenship is virtually irrevocable), and Mexico permit multiple nationalities.

Europe

The United Kingdom, Ireland, France, and Italy are long-standing proponents of dual nationality. Germany recently made headlines by overhauling its citizenship laws. As of the Modernisation of Nationality Law which took full effect recently, Germany officially allows dual citizenship for non-EU citizens without the previous 'special permission' requirements. This marks a significant shift in European policy, aligning the continent's largest economy with international trends.

Citizenship by Investment (CBI) Jurisdictions

For HNWIs, the CBI jurisdictions are the most streamlined. Saint Kitts and Nevis, the pioneer of the industry since 1984, explicitly allows dual citizenship. Grenada, Dominica, Saint Lucia, and Antigua and Barbuda follow the same model. In Europe, Malta's Granting of Citizenship by Exceptional Services for Direct Investment (MEIN) allows successful applicants to retain their original nationality, provided their home country also permits it.

Which countries prohibit dual citizenship?

Despite the global trend, several major economies maintain a strict stance against multiple nationalities. This is often rooted in traditional views of national loyalty or concerns regarding administrative complexity.

Asia

China remains the most prominent example of a country that does not recognise dual citizenship. Under Article 9 of the PRC Nationality Law, any Chinese national who settles abroad and acquires foreign citizenship automatically loses their Chinese nationality. Singapore is equally strict; upon reaching the age of 21, dual nationals must choose one citizenship or face the loss of their Singaporean status. Japan generally requires those who acquire a second nationality to renounce their Japanese passport, though recent legal challenges in Tokyo courts have begun to test the rigidity of this rule.

Middle East

Most Gulf Cooperation Council (GCC) nations, including the United Arab Emirates, Saudi Arabia, and Qatar, traditionally do not allow dual citizenship. However, the UAE has recently introduced a 'Golden Visa' path that can lead to citizenship for exceptional talents and investors, which handles the dual nationality aspect on a highly discretionary, case-by-case basis.

Comparison of Key Jurisdictions (2026 Data)

How do partial or restricted dual citizenship rules work?

Some nations sit in a 'grey zone' where dual citizenship is permitted only under specific circumstances. For instance, Spain generally requires naturalising citizens from non-Ibero-American countries to renounce their previous nationality, yet it maintains treaties with countries like Portugal, Andorra, and its former colonies that allow dual status.

In India, the government does not allow dual citizenship but offers the 'Overseas Citizenship of India' (OCI) status. While not a full passport (it does not allow voting or holding political office), it provides most of the rights of a citizen, including lifelong entry and the right to work and own property in India. This serves as a functional proxy for dual nationality for the vast Indian diaspora.

What are the risks of holding multiple citizenships?

While the benefits of travel and security are clear, there are legal and financial obligations that must be managed by professional advisors.

Consular Assistance

If you hold citizenship in two countries and are in one of them, the other country’s embassy may be limited in its ability to provide consular services. International law, specifically the Master Nationality Rule, often dictates that a state does not afford diplomatic protection to one of its nationals against a state whose nationality such person also possesses.

Military Service

Certain countries, such as South Korea, Israel, and Greece, have mandatory military service. Acquiring these citizenships, or being born into them, may result in conscription requirements that are not waived just because the individual holds a second passport. It is vital to check the 'Active Duty' requirements of all nations involved.

Taxation

Taxation is rarely based on citizenship alone, with the notable exceptions of the United States and Eritrea. However, becoming a citizen usually facilitates becoming a tax resident. HNWIs must navigate Common Reporting Standards (CRS) and FATCA regulations to ensure global compliance. High-net-worth investors should always consult a specialist tax attorney before finalising a second citizenship.

How to acquire a second citizenship in 2026?

For those not born with dual nationality, there are three primary routes:

1. Naturalisation: This requires living in a country for a set period, typically 3 to 10 years, and demonstrating integration through language proficiency and cultural tests.
2. Descent (Jus Sanguinis): Many European countries, such as Italy, Poland, and Ireland, allow individuals to claim citizenship if they can prove a parent or, in some cases, a great-grandparent was a citizen.
3. Investment (CBI): This is the fastest route for HNWIs. By making a qualifying contribution to a national fund or purchasing approved real estate, an investor can receive a passport in as little as 3 to 6 months in the Caribbean or 12 to 36 months in Europe.

Frequently Asked Questions

Can I have three or even four citizenships?

Yes, there is no international law limiting the number of citizenships a person can hold. If each respective country allows multiple nationalities, you can hold 'multiple' citizenship. Many global investors hold three or more passports to maximise global access.

Does the US allow dual citizenship for its citizens?

Yes, the US government acknowledges that dual citizenship exists. US citizens are not required to give up their US citizenship when they acquire another nationality in a foreign country, provided they do not intend to relinquish their US status.

What happens if my home country forbids dual citizenship but I get a second one anyway?

If your home country has a strict 'one nationality' rule, you risk the automatic loss of your original citizenship. Some countries may also impose fines or legal penalties, though the primary consequence is usually the revocation of the original passport.

Is dual citizenship the same as a Golden Visa?

No. A Golden Visa provides residency, allowing you to live in a country. Dual citizenship provides a passport and the full rights of a national. Some Golden Visas can lead to citizenship after a set number of years, but it is not immediate.

Does Germany now allow dual citizenship in 2026?

Yes, under legislation passed recently, Germany has eliminated the ban on dual citizenship for naturalising residents, allowing them to keep their original nationality while becoming German citizens.

Disclaimer: This article is for informational purposes only and does not constitute legal, financial, or tax advice. Citizenship laws are subject to frequent change. Readers should consult with a qualified immigration attorney or tax advisor before making any decisions regarding multiple nationalities.