Home/USA/Expat Dual Citizenship Guide
Nationality Law Guide

U.S. Expat Dual Citizenship Rules

Understand U.S. Department of State dual nationality policies, country-by-country rules, and global passport obligations.

Select Foreign Country to Check Dual Nationality Status

🇬🇧 U.S.-UK Dual Citizenship Rules

Allowed

The United Kingdom allows dual nationality. A British citizen can acquire U.S. citizenship without automatically losing British citizenship, subject to the other country’s nationality laws.

Key Statutory Rules & Passport Obligations:
  • The UK recognizes dual nationality and does not require a separate application simply to hold another nationality.
  • A British dual national can hold a valid British passport; the travel-document rules of the country of the other nationality also need to be followed.
  • As a U.S. citizen, you must use your valid U.S. passport to enter and leave the United States.

How U.S. Dual Citizenship Actually Works

Dual citizenship is not created by one universal international rule. The United States and the other country each apply their own nationality laws. A person may therefore be recognized as a citizen by two countries, or may lose one nationality when acquiring the other, depending on the laws of those countries.

U.S. nationality and foreign nationality are separate questions.

The United States generally permits its citizens to acquire another nationality without automatically losing U.S. citizenship. The other country may have a completely different rule, including automatic loss, renunciation requirements, or recognition of only one nationality.

Passport rules can differ from citizenship rules.

Holding two nationalities does not mean either country accepts every travel document in every circumstance. U.S. citizens must use a U.S. passport to enter and leave the United States. The other country may impose its own passport or entry-document requirement.

Tax obligations are separate from nationality recognition.

U.S. citizenship can create continuing U.S. tax obligations even when the citizen lives abroad. Whether a tax return or international information report is required depends on the applicable thresholds and facts.

Country-specific rules must be checked before naturalization.

Before becoming a U.S. citizen, a foreign national should check whether their existing country permits dual nationality, whether nationality is lost automatically, whether a declaration or passport procedure is required, and whether special rules apply to travel or residence.

⭐ Low-Fee Money Transfer Real Exchange Rate
Wise International Money Transfer

Send money across 50+ currencies with real mid-market exchange rates and zero hidden bank markup fees.

Transfer Money with Wise
🛡️ Guaranteed Mid-Market Rate
U.S. Naturalization Precedents

Supreme Court Precedents: Afroyim v. Rusk (387 U.S. 253) and Vance v. Terrazas (444 U.S. 252) establish important limits on involuntary loss of U.S. citizenship. In general, an expatriating act must be voluntary and accompanied by the legally required intent to relinquish U.S. nationality.

🔗 Related Guides

Related US Tools & Guides

VisasH-1B Layoff
USCIS H-1B 60-Day Grace Period Calculator
Tax183-Day Test
IRS Substantial Presence Test Calculator
Tax$10k Threshold
FBAR ($10k) & FATCA Form 8938 Calculator
Visas125% HHS
Form I-864 Poverty Guidelines Calculator
F-1 VisaSEVP Portal
OPT STEM 150-Day Unemployment Tracker
Citizenship30-Month Rule
N-400 Naturalization Physical Presence Checker
View All US Calculators & Master Directory →

Frequently Asked Questions (FAQ)

Yes. U.S. law permits dual nationality. The Department of State explains that a U.S. citizen may hold another nationality and that U.S. law does not generally require a citizen to choose between U.S. citizenship and another nationality. The laws of the other country must also be checked.

U.S. citizens, including dual nationals, must use a valid U.S. passport to enter and leave the United States. A U.S. citizen is not eligible to obtain a U.S. visa for travel to the United States.

India does not allow a person to retain Indian citizenship after voluntarily acquiring foreign citizenship. Section 9 of the Citizenship Act, 1955 addresses termination of Indian citizenship in this situation. Former Indian citizens may be eligible to apply for OCI, which is a status for foreign nationals of Indian origin and is not Indian citizenship.

Yes. Since June 27, 2024, German nationals generally no longer lose German nationality merely because they acquire another nationality, and the previous retention-permit requirement was abolished. The reform is not retroactive; older cases must be assessed under the law applicable when the foreign nationality was acquired. Former German citizens may in some circumstances be eligible for reacquisition under Section 13 StAG.

U.S. citizens generally remain subject to U.S. federal tax rules on worldwide income even when living abroad. However, not every U.S. citizen automatically has to file Form 1040, an FBAR, or Form 8938. Filing and reporting depend on the applicable income, account, asset, and other statutory thresholds. The foreign country's tax rules may also apply.

Acquiring another nationality does not by itself automatically terminate U.S. citizenship. Under U.S. law and Supreme Court precedent, loss of U.S. nationality generally requires a voluntary expatriating act performed with the requisite intent to relinquish U.S. nationality. The Department of State makes the same distinction in its current dual-nationality guidance.
Official Government References

• U.S. Department of State — Dual Nationality: travel.state.gov/dual-nationality
• USCIS Citizenship & Naturalization Policy Manual: uscis.gov/policy-manual
• Government of Canada — Dual Canadian Citizens: canada.ca/dual-canadian-citizens
• German Federal Foreign Office — Nationality Law: auswaertiges-amt.de
• Indian Citizenship Online: indiancitizenshiponline.nic.in
• Passport Seva — Surrender Certificate: passportindia.gov.in
• OCI Services: ociservices.gov.in