Dual Citizenship 2026: Which Countries Allow It and Which Restrict It
Dual citizenship rules vary wildly across jurisdictions, and getting it wrong can cost you an existing nationality. This guide covers where dual citizenship is straightforward, where it's conditional, and where holding two passports will get one of them revoked.
The default assumption that "most countries allow dual citizenship" is roughly correct but dangerously imprecise. The details matter. Some countries allow it but don't recognize it (meaning they'll treat you exclusively as their citizen while you're on their soil). Others technically prohibit it but don't enforce the prohibition. A few will actively strip your citizenship if you naturalize elsewhere. Knowing which category a country falls into before you start a naturalization or CBI process isn't optional.
Countries that fully allow dual citizenship
Most of the Americas operate on unrestricted dual citizenship. The United States, Canada, Mexico, Brazil, Argentina, Colombia, Chile, and virtually every Caribbean and Central American nation allow citizens to hold multiple nationalities without restriction. A US citizen who naturalizes as Canadian doesn't lose US citizenship. A Brazilian who acquires Portuguese nationality keeps both.
In Europe, the picture is similarly permissive for most countries. The UK, France, Germany (since the 2024 reform), Italy, Portugal, Spain, Ireland, Switzerland, Belgium, Sweden, Denmark, and most others allow dual citizenship without conditions. Germany's shift is recent and significant: until June 2024, German citizens who naturalized in a non-EU country automatically lost German citizenship. The new Nationality Act reform eliminated that restriction, which was a major obstacle for German expats considering naturalization elsewhere.
Australia and New Zealand both allow dual citizenship. The Philippines, which previously revoked citizenship upon foreign naturalization, changed its policy through the Dual Citizenship Act and now allows former Filipino citizens to re-acquire their nationality while keeping their new one.
Countries that prohibit or heavily restrict it
China is the strictest major economy. The Chinese Nationality Law states that Chinese citizens who voluntarily acquire foreign nationality automatically lose Chinese citizenship. There's no dual citizenship provision, no exception process, and no ambiguity. Chinese nationals who naturalize abroad are supposed to surrender their Chinese passport and hukou (household registration). Enforcement is increasingly rigorous, particularly for government employees and Communist Party members.
India takes a similar position. Indian nationality law does not permit dual citizenship. Indians who acquire foreign nationality lose Indian citizenship automatically under the Citizenship Act. India offers an OCI (Overseas Citizen of India) card as a consolation, which grants visa-free travel and some rights to live and work in India, but it is not citizenship. You can't vote, hold government office, or buy agricultural land with OCI status.
Singapore doesn't allow dual citizenship for adult citizens. Male Singaporeans have mandatory national service obligations, and the government has historically been aggressive about enforcement. Singaporean men who acquire foreign citizenship before completing national service face criminal penalties if they return. The Immigration and Checkpoints Authority requires renunciation of foreign citizenship for anyone applying to retain or regain Singaporean nationality.
The UAE presents a nuanced case. Emirati citizens have historically been prohibited from holding dual nationality, though enforcement has been inconsistent. The UAE's naturalization program (launched 2021) grants citizenship to select investors and professionals, but recipients are not required to renounce their existing nationalities. So the UAE allows dual citizenship for naturalized citizens but effectively restricts it for born citizens. The practical distinction matters if you're an Emirati national considering foreign naturalization versus a foreign national receiving Emirati citizenship.
Other notable prohibitions: Myanmar, Nepal, and Indonesia all prohibit dual citizenship for adults. Indonesia has a limited exception for children of mixed-nationality parents, who must choose one nationality by age 18. Saudi Arabia, Bahrain, and Kuwait generally prohibit dual nationality for citizens, though enforcement varies.
The conditional middle ground
Japan technically does not allow dual citizenship for adults. Japanese citizens who acquire foreign nationality are supposed to choose one within two years. In practice, Japan has historically not enforced this aggressively for citizens living abroad, and many Japanese nationals quietly hold second passports. The Ministry of Justice has occasionally sent reminder notices but has never revoked citizenship for failure to choose. This creates a de facto tolerance that differs significantly from the written law.
South Korea requires male citizens to complete military service before they can renounce Korean citizenship. Korean men who acquire foreign citizenship before completing service face significant complications, including travel restrictions and potential conscription if they enter Korean territory. After age 38 (when the service obligation expires), the practical restrictions diminish. South Korea allows dual citizenship for certain categories: foreign spouses of Korean nationals, ethnic Koreans over 65 returning from abroad, and individuals who make "special contributions" to the country.
Austria generally prohibits dual citizenship but grants exceptions through a cabinet-level decision for individuals deemed to serve Austria's interests. This is how Austria handles its CBI-equivalent process: wealthy individuals or those with exceptional skills can receive Austrian citizenship by special decree while retaining their existing nationality. The process is opaque, expensive (substantial investment or donation required), and limited to a handful of approvals per year.
The Netherlands has a complex set of exceptions to its general prohibition on dual citizenship. Dutch citizens who naturalize abroad lose Dutch citizenship automatically, with exceptions for those married to Dutch nationals, those born in the other country, or those from countries where renunciation is impossible or unreasonably difficult. The exception list is specific and not intuitive.
Tax implications most people miss
The United States taxes citizens on worldwide income regardless of where they live. This is nearly unique globally (only Eritrea does something similar). US dual citizens living permanently abroad still file US tax returns annually and may owe US tax on foreign income, foreign investments, and foreign retirement accounts. FBAR and FATCA reporting requirements add compliance costs of $1,000-5,000 per year in professional fees for Americans with foreign financial accounts.
For non-US dual citizens, the tax implications are usually less dramatic. Most countries tax based on residency, not citizenship. A French-Brazilian dual citizen living in Singapore pays Singapore tax on Singapore-sourced income and generally owes nothing to France or Brazil on that income (subject to local sourcing rules). But establishing tax residency sometimes triggers departure taxes in the country you're leaving, and some countries (like Australia with its departure tax on unrealized capital gains) can create nasty surprises.
CRS (Common Reporting Standard) adds another layer. Financial institutions report account information to all countries where the account holder is a tax resident. Holding dual citizenship doesn't create dual tax residency by itself, but it can trigger additional reporting and questions from banks during KYC processes. Some banks treat dual citizens as higher-risk customers, complicating account opening.
Military service and security clearances
Dual citizenship creates real problems in two specific areas that people often discover too late.
Military service obligations exist in South Korea, Israel, Turkey, Greece, and several other countries. Dual citizens who visit these countries may find themselves subject to conscription or unable to leave until service obligations are resolved. Israel's IDF actively contacts Israeli dual citizens living abroad when they reach service age. Turkey requires military service or payment of a substantial exemption fee for male citizens, including dual nationals.
Security clearances in the US, UK, Australia, and several other countries are complicated by dual citizenship. US security clearance applications require disclosure of all citizenships and can be delayed or denied based on the other nationality held. Intelligence and defense roles in most countries require candidates to renounce non-domestic citizenships as a condition of employment.
Practical considerations for the decision
Before pursuing a second citizenship, verify three things with a qualified immigration attorney (not a CBI marketing agent):
First, will your current country actually let you keep your existing citizenship? Don't rely on internet forums. The rules are specific and the consequences of getting it wrong (involuntary loss of your birth citizenship) are irreversible in most cases.
Second, understand the tax obligations of both citizenships combined. US citizenship in particular creates permanent worldwide tax obligations that many people underestimate until they're filing their first FBAR.
Third, check whether the combination of citizenships creates travel complications. Some country pairs have tensions that make dual nationals targets for additional scrutiny, detention, or consular access issues. Dual US-Iranian citizens, for example, face well-documented complications when traveling to Iran, where the Iranian government does not recognize the US citizenship and will not allow US consular access.
Dual citizenship is a tool. Like any tool, its value depends on the specific combination, your personal circumstances, and whether you understand the obligations that come with it. The passport itself is the easy part. The compliance is permanent.
