Yes, dual citizens can have two passports, one issued by each country of citizenship, and using both is legal under U.S. law. The Supreme Court has held that an American cannot be stripped of citizenship without voluntarily giving it up, so acquiring a second passport does not put your U.S. one at risk.1Justia Law. Afroyim v. Rusk, 387 U.S. 253 (1967) The catches are on the other side of the ledger: the second country has to permit dual nationality, you have to show the right passport at the right border, and you pick up tax and reporting duties that many dual citizens never realize apply to them.
Check Whether the Other Country Allows It
The United States permits dual citizenship. Many countries do not. China, Japan, India, Singapore, Indonesia, and most Gulf states either prohibit it outright or treat naturalization elsewhere as automatic loss of the original nationality. A Chinese citizen who naturalizes as an American loses Chinese citizenship in China’s eyes. India does not allow dual citizenship at all, though it offers Overseas Citizenship of India, a separate status that grants residency and travel benefits without full nationality.
Japan requires citizens to choose one nationality by age 22. South Korea permits dual citizenship in limited circumstances and ties it to mandatory military service for men. The rules change, so confirm with both countries’ consulates before applying for a second passport. Losing your original citizenship by accident can be irreversible.
Why Getting a Second Passport Doesn’t Cost You Your U.S. One
In Afroyim v. Rusk, decided in 1967, the Supreme Court held that Congress has no power to take away someone’s citizenship unless that person voluntarily gives it up.1Justia Law. Afroyim v. Rusk, 387 U.S. 253 (1967) The decision overturned an earlier case in which the government had revoked a man’s citizenship for voting in a foreign election.
Federal law still lists acts that can lead to loss of nationality, including naturalizing in a foreign country, swearing allegiance to a foreign government, serving as an officer in a foreign military, and committing treason.2Office of the Law Revision Counsel. 8 USC 1481 – Loss of Nationality by Native-Born or Naturalized Citizen After Afroyim, none of these acts strips citizenship automatically. The government must prove you performed the act with the specific intent of giving up your U.S. nationality. In practice, the State Department presumes you intend to keep both citizenships unless you say otherwise, so naturalizing in Canada or taking a citizenship oath in the UK does not cost you your American passport.
One thing to understand about holding two passports: each country you’re a citizen of will treat you exclusively as its own citizen when you are on its soil. This “master nationality” principle means the country’s taxes, courts, and military obligations apply to you regardless of your other passport. The U.S. embassy in your second country generally cannot intervene in local legal matters, because that government sees you as one of its own first.
Which Passport to Show at Each Border
Federal law requires U.S. citizens to enter and leave the United States on their American passport.3Office of the Law Revision Counsel. 8 USC 1185 – Travel Control of Citizens and Aliens There is no exception for dual citizens. Showing up at a U.S. port of entry with only your foreign passport invites delays, extra questioning from Customs and Border Protection, and complications in your travel record.
Outside that rule, the general principle is to show each country’s passport when entering that country. Take a dual U.S.-Italian citizen flying from New York to Rome:
- At airline check-in for the outbound flight, show the Italian passport, so the airline sees you can enter Italy without a visa.
- At U.S. exit controls, if applicable, show the U.S. passport.
- At Italian immigration on arrival, show the Italian passport and enter as a citizen with no stay limits or work restrictions.
- Returning, show the U.S. passport at airline check-in so the airline knows you don’t need an ESTA or visa, then again at U.S. immigration on arrival.4U.S. Department of State. Visa Waiver Program
Using the destination country’s passport at check-in avoids ESTA approvals and tourist visas, saving money and time. Nothing about this is hidden. Airlines share passenger data with both governments through international security agreements, so using two passports is a matter of showing the right document at the right window, not concealing anything.
Update Global Entry and Similar Programs
If you have Global Entry, NEXUS, or SENTRI, your profile needs to reflect both passports. Adding a second citizenship to a Trusted Traveler account requires a visit to an enrollment center in person; you can’t make the change online or by phone.5U.S. Customs and Border Protection. Can I Add or Change My Citizenship Through My TTP Account Most centers at airports and public buildings accept walk-ins; some want a call ahead. If your profile doesn’t match the passport you scan at the kiosk, the system can reject you and send you to the regular inspection line.
Enroll in STEP for the Second Country
Dual citizens traveling to or living in their second country of citizenship should consider the State Department’s free Smart Traveler Enrollment Program. STEP sends security, health, and disaster alerts from the nearest U.S. embassy and helps consular staff locate you in an emergency.6Travel.State.Gov. STEP – Smart Traveler Enrollment Program Since dual citizens are in a gray area for consular assistance in their second country, STEP enrollment at least puts the embassy on notice that you’re there.
Tax and Foreign Account Reporting
This is where dual citizenship gets expensive. The United States taxes citizens on worldwide income no matter where they live. A dual citizen living in the second country still owes U.S. tax returns every year and may owe additional reporting on foreign accounts and assets.
Foreign Bank Account Reports
If you have signature authority over, or a financial interest in, foreign bank accounts whose combined value tops $10,000 at any point during the year, you must file a Report of Foreign Bank and Financial Accounts (FBAR) with the Financial Crimes Enforcement Network.7Financial Crimes Enforcement Network. Report Foreign Bank and Financial Accounts That $10,000 threshold is the aggregate across all your foreign accounts, not per account. A checking account with $6,000 and a savings account with $5,000 in another country puts you over the line.
FATCA Reporting
On top of the FBAR, the IRS requires Form 8938 for specified foreign financial assets above higher thresholds. Unmarried filers living in the United States report when foreign assets exceed $50,000 on the last day of the tax year or $75,000 at any point during the year. Married couples filing jointly have a $100,000 year-end threshold or $150,000 at any point.8Internal Revenue Service. Summary of FATCA Reporting for US Taxpayers Thresholds are significantly higher for taxpayers living abroad.
Catching Up on Missed Returns
Many dual citizens, especially those raised abroad who only recently learned about U.S. tax duties, have years of unfiled returns. The IRS Streamlined Filing Compliance Procedures let non-willful filers come into compliance without penalties, provided the IRS hasn’t already opened a civil examination or criminal investigation.9Internal Revenue Service. Streamlined Filing Compliance Procedures Addressing the gap before the IRS contacts you is much less painful than answering after they do.
When a Second Passport Causes Problems
Security Clearances and Federal Jobs
Holding a second passport can complicate federal careers. The adjudicative guidelines used across federal personnel security programs treat dual citizenship as a “foreign preference” concern evaluated case by case. Possessing or using a foreign passport, voting in foreign elections, accepting benefits from a foreign government, and serving in another country’s military can all be disqualifying for a security clearance.10U.S. Department of State. Dual Citizenship – Security Clearance Implications
The standard is “unquestioned allegiance to the United States” free from undue foreign influence, with any doubt resolved against the applicant. The State Department will not assign dual-citizen employees to a country where they hold citizenship, except in extraordinary circumstances. A clearance is not impossible for dual citizens, but the process takes longer and requires more documentation. Some applicants renounce their second citizenship voluntarily to simplify it.
Foreign Military Service
Several countries conscript their citizens, and an American passport doesn’t exempt you. South Korea is the prominent example: male citizens face conscription regardless of where they live. A dual Korean-American who has not completed service faces restrictions on visiting South Korea after age 25, and his postponement can be revoked if he stays more than six months or takes paid work there. Completing the service is one path to keeping both citizenships; afterward, the person can pledge not to exercise foreign nationality rights within Korea.
Israel, Turkey, Greece, and other countries have similar rules that can reach dual citizens. Before traveling to your second country, find out whether you have outstanding military obligations. Arriving at the border with an unresolved conscription notice can result in being detained or barred from leaving.
If You Decide to Give Up One Citizenship
Some dual citizens eventually renounce, whether for tax simplification, a clearance, or personal reasons. Renouncing U.S. citizenship requires appearing before a consular officer at a U.S. embassy abroad and paying a non-refundable $2,350 processing fee. The fee is not waivable, and you don’t get it back if your application for a Certificate of Loss of Nationality is denied.
Under federal law, you can lose U.S. nationality by voluntarily naturalizing in another country, swearing allegiance to a foreign government, serving as an officer in foreign armed forces, or formally renouncing before a consular officer, but only if you perform the act with specific intent to give up citizenship.2Office of the Law Revision Counsel. 8 USC 1481 – Loss of Nationality by Native-Born or Naturalized Citizen Without that intent, none of these acts automatically strips citizenship.
The financial consequences can be severe. Under IRC Section 877A, anyone renouncing U.S. citizenship may be classified as a “covered expatriate” if their net worth is $2 million or more, or if their average annual net income tax liability over the preceding five years exceeds a threshold (roughly $200,000 after inflation adjustments).11Office of the Law Revision Counsel. 26 USC 877A – Tax Responsibilities of Expatriation Covered expatriates face a mark-to-market “exit tax” that treats all worldwide assets as if sold on the day before expatriation, with an inflation-adjusted exclusion amount built from a $600,000 base. Anyone weighing renunciation for financial reasons should consult an international tax attorney first, because the exit tax can easily cost more than years of continued dual-citizen compliance.