Headman Law Group editorial team
Published July 22, 2026
Every naturalization applicant asks this question, and the internet gives contradictory answers. Here is the framework that actually works.
The U.S. position
The U.S. naturalization oath includes the phrase 'I absolutely and entirely renounce and abjure all allegiance and fidelity to any foreign prince, potentate, state, or sovereignty of whom or which I have heretofore been a subject or citizen.' Read literally, this sounds like renunciation.
In practice, the State Department has interpreted this oath for decades as not requiring a formal act of renunciation of foreign citizenship. The oath is an expression of primary allegiance to the U.S., not a legal instrument that automatically ends foreign nationality. Immigrants naturalize and then continue to hold foreign passports, use foreign identity documents, and vote in foreign elections without losing U.S. citizenship.
The one narrow exception: certain foreign government positions (senior political office, service in foreign armed forces in wartime, formal renunciation done with intent to relinquish U.S. citizenship) can lead to U.S. citizenship loss. For ordinary dual nationals living a private life, U.S. citizenship is safe.
How your home country decides
The critical rule: your home country's laws determine whether you keep or lose your original citizenship when you naturalize elsewhere. The U.S. cannot make this decision for you. Countries fall into four broad categories.
Category 1: Full dual citizenship — no impact on original nationality
- Canada
- United Kingdom (and most Commonwealth realms)
- Ireland
- Australia
- New Zealand
- France
- Germany (as of 2024 reforms)
- Italy
- Spain (with some restrictions on non-Iberoamerican dual citizens)
- Poland
- Mexico
- Brazil
- Argentina
- Colombia
- Peru
- Chile
- Philippines (via reacquisition of Philippine citizenship after loss)
- South Korea (limited — only for those who naturalize before certain ages)
- Switzerland
- Sweden, Norway, Denmark, Finland
- Israel
- Turkey
Category 2: Automatic loss of original citizenship on U.S. naturalization
- Japan — Japanese citizens who voluntarily acquire another nationality automatically lose Japanese citizenship under the Nationality Law.
- Singapore — Similar automatic loss.
- China (PRC) — Automatically loses Chinese citizenship on voluntary foreign naturalization. Note: enforcement is variable and complex, but the law is clear.
- Saudi Arabia — Formal renunciation required.
- Kuwait, UAE — Historically strict, though some updates in recent years for specific categories.
- Ethiopia — Requires prior permission; automatic loss otherwise.
- Nepal — Automatic loss.
Category 3: No dual citizenship but with reacquisition or overseas-national programs
- India — Prohibits dual citizenship, but Indian-born U.S. citizens can obtain the Overseas Citizenship of India (OCI) card, which provides lifetime multi-entry visa, right to live and work indefinitely in India, and property ownership rights. OCI is not citizenship but functions similarly for most purposes.
- Philippines — Filipinos who naturalize in the U.S. can reacquire Philippine citizenship under RA 9225 (the Dual Citizenship Act of 2003), restoring full citizenship rights.
- Some Eastern European countries — Various reacquisition programs for those with ancestral ties.
Category 4: Special or transitional rules
- Germany — Historically required renunciation, but 2024 reforms now allow dual citizenship in most cases.
- Netherlands — Historically strict, but new reforms are expanding dual-citizenship allowances.
- Austria — Generally requires renunciation, with narrow exceptions.
- Norway — Allowed dual citizenship starting in 2020.
U.S. tax implications
The U.S. taxes its citizens on worldwide income regardless of residence. Once you naturalize, you are a U.S. tax subject for life until you formally renounce U.S. citizenship. Dual citizens must file U.S. tax returns even while living abroad, and may face additional reporting requirements (FBAR for foreign bank accounts over $10,000, Form 8938 for foreign financial assets, and various information returns for foreign trusts and gifts).
Foreign tax credits and the foreign earned income exclusion generally prevent double taxation, but the reporting complexity is real. Dual citizens with significant assets abroad should engage a cross-border tax specialist before naturalizing to understand ongoing obligations.
Practical considerations for dual citizens
- Passport carry rule: U.S. law requires U.S. citizens to enter and depart the U.S. on a U.S. passport. Dual citizens should carry both passports and use the appropriate one at each border.
- Voting: Dual citizens may vote in both countries' elections where allowed. Voting in a foreign election does not affect U.S. citizenship in most cases.
- Military service: Some countries impose military service obligations on citizens, which can complicate travel and residence.
- Consular protection: If you are in your other country of citizenship, the U.S. cannot generally provide consular protection there.
- Marriage and family matters: Some countries recognize marriages and adoptions differently for citizens vs. foreigners. Dual citizens may fall under home-country law for civil matters in that country.
Renouncing U.S. citizenship later
U.S. citizenship, once acquired, can be renounced but not lightly. Formal renunciation requires appearing at a U.S. embassy abroad, signing an oath of renunciation, and paying a $2,350 processing fee. Renouncers with high net worth may also face an expatriation tax under IRC §877A. Renunciation is a personal decision with tax and family consequences and requires careful planning.
Practical checklist before naturalizing
- Confirm your home country's current dual citizenship rules (they may have changed).
- If your country strips citizenship, decide whether inheritance rights, property ownership, and family ties justify keeping original citizenship or naturalizing anyway.
- For India-born applicants, plan the OCI application timeline (typically after U.S. citizenship is obtained).
- For high-net-worth applicants, consult a cross-border tax attorney on U.S. worldwide taxation obligations.
- Notify your home country's embassy of naturalization if required — some countries require self-reporting.
