Dual Citizenship United States: What You Can (and Can't) Keep

Most people naturalizing as US citizens quietly assume they'll keep their original passport. Sometimes they're right. Sometimes they lose citizenship in their birth country automatically — without any formal notice — the moment they raise their hand at the oath ceremony. The rules depend entirely on the other country's laws, not US law.

Here is what you need to know before you file your N-400.

Does the US Allow Dual Citizenship?

The United States does not formally recognize dual citizenship, but it also does not prohibit it. The State Department's position is essentially: we won't tell you to renounce your foreign citizenship, but we won't acknowledge it either. When you naturalize, you take the Oath of Allegiance which includes a clause renouncing "all allegiance and fidelity to any foreign prince, potentate, state, or sovereignty." In practice, USCIS does not enforce this against the other country — they simply expect you to enter and exit the US on your US passport once you're a citizen.

The practical implication: you may hold two passports legally from the US side. Whether the other country lets you keep its citizenship is a separate question governed by that country's law.

Country-by-Country Rules in 2026

United Kingdom

The UK allows dual citizenship. British nationals who naturalize as US citizens can keep their British passport. However, as of February 25, 2026, dual UK-US citizens traveling to the UK must use their British passport (or a digital Certificate of Entitlement) to enter — a US passport alone will no longer satisfy border control due to new Electronic Travel Authorisation (ETA) rules. If you have a UK passport, keep it valid.

Germany

Germany's position changed dramatically with the June 2024 StARModG reform. Germans who naturalize in the US in 2026 no longer need to obtain a "retention permit" (Beibehaltungsgenehmigung) to preserve their German citizenship. Germany now broadly accepts dual citizenship. If you naturalized before the reform and were told you lost German citizenship, consult a German immigration lawyer — some situations may be resolvable.

Canada

Canada allows dual citizenship. Canadian-born individuals who become US citizens retain their Canadian status automatically. There is nothing to file with the Canadian government. You can continue using your Canadian passport for travel back to Canada.

Australia

Australia generally allows dual citizenship, but Australian law has restrictions for people in certain positions of trust (e.g., some government roles). For most people naturalizing as US citizens, Australian citizenship is retained automatically.

India

India does not allow dual citizenship. Under the Indian Citizenship Act, acquiring citizenship of another country results in automatic termination of Indian citizenship. You do not need to formally surrender your passport first — the loss is automatic at the moment you naturalize. Most Indian-born US citizens then apply for Overseas Citizen of India (OCI) status, which provides lifelong visa-free entry to India and near-equivalent rights to Indian citizens, with some exceptions (purchasing agricultural land, voting, holding certain public offices).

China

China strictly prohibits dual citizenship. Chinese nationality law states that a Chinese citizen who voluntarily acquires a foreign nationality automatically loses Chinese citizenship. There is no process to retain it, and no OCI-equivalent. Chinese nationals naturalizing in the US are advised to apply for a Chinese visa in their new US passport for future travel, rather than attempting to use a Chinese passport that is technically void.

Mexico

Mexico allows dual citizenship and has done so since 1998. Mexican nationals who naturalize in the US retain their Mexican citizenship and can continue using their Mexican passport to enter Mexico. This is one of the more straightforward dual citizenship situations for US naturalization applicants.

What the Oath of Allegiance Actually Means

The Oath includes renouncing "all allegiance to any foreign prince, potentate, state, or sovereignty." This sounds absolute, but its practical interpretation has narrowed considerably over decades. The State Department's current policy is that a US citizen does not lose US citizenship merely by voting in a foreign election, serving in a non-combat foreign military role, or holding a foreign passport — as long as these acts are not done with the intent to relinquish US citizenship.

The key phrase is "intent to relinquish." If you vote in a Canadian election as a dual citizen, you are not automatically stripped of US citizenship. If you formally renounce US citizenship before a consular officer abroad, you are.

Planning Your Naturalization Timeline Around Dual Citizenship

If you are from a country that terminates citizenship upon naturalization (India, China, and several others), the timing of your oath ceremony has practical consequences you need to plan for:

• Renew your original country passport before naturalizing if you anticipate needing it for travel or consular services in the transition period.
• Apply for any OCI status or equivalent as soon as possible after naturalization. Indian OCI applications require your US Certificate of Naturalization, so you cannot start until after the oath.
• Check property and pension implications. Some countries restrict property ownership or inheritance rights for non-citizens. India, for instance, restricts certain land purchases by OCI holders.

For countries where citizenship is retained automatically (UK, Germany, Canada, Mexico, Australia), less advance planning is needed — but keeping your foreign passport current is still advisable, especially for travel to that country.

The Certificate of Naturalization and Foreign Travel

Once you naturalize, the US requires you to enter and exit the US using your US passport. For travel to your birth country, use whichever passport that country's border control expects. Dual nationals from countries that allow it often carry both passports and use each one at the appropriate border — US passport for US entry and exit, foreign passport for entry into the other country.

There is nothing illegal about this from the US side. It is standard practice for dual nationals worldwide.

The naturalization process itself — filing the N-400, preparing for the civics test, handling the interview — involves many more moving parts than the dual citizenship question alone. The US Naturalization (N-400) Citizenship Guide covers the full process: residency calculations, the 2025 civics test, good moral character requirements, and step-by-step interview prep.