Dual Citizenship & Passport Guide

How naturalizing as a U.S. citizen affects your home country citizenship, passport privileges, and travel rules.

Select Your Citizenship Country

Choose your country of citizenship to view adult dual nationality rules:

🇬🇧 U.S.-UK Dual Citizenship Rules

Allowed

The United Kingdom fully permits dual and multiple citizenships. A British citizen who naturalizes as a U.S. citizen does not lose their British passport or citizenship.

Core Legal Guidelines:

No notification is required to the UK government upon naturalizing as a U.S. citizen.
You can hold and renew both U.S. and UK passports.
When entering the UK, you must present your British passport, and when entering the U.S., you must present your U.S. passport.

⚠️ Warning: As a dual citizen, you remain subject to U.S. tax filing obligations on your worldwide income, regardless of where you live.

U.S. Naturalization Oath

The Oath of Allegiance: Although the U.S. naturalization oath contains language renouncing foreign allegiances, the U.S. Supreme Court (Afroyim v. Rusk) has ruled that U.S. citizens cannot be stripped of their U.S. citizenship unless they voluntarily commit to relinquishing it. Thus, the U.S. fully permits dual citizenship.