U.S. law does not cap the number of citizenships an American can hold. You can be a citizen of the United States and one, two, or more other countries at the same time, and adding a foreign nationality will not cost you your American one unless you intend it to. The State Department’s own guidance uses the plural deliberately, referring to “another (foreign) nationality (or nationalities).”1U.S. Department of State. Dual Nationality The real ceiling is set by the other countries involved and by the obligations that stack up with each passport you add.
Why There Is No U.S. Limit
Federal law does not require an American to ask permission before naturalizing abroad, and it does not force a choice between nationalities.1U.S. Department of State. Dual Nationality Two Supreme Court decisions anchor that position. Afroyim v. Rusk held that Congress cannot strip citizenship without the citizen’s voluntary consent.2Justia U.S. Supreme Court Center. Afroyim v. Rusk Vance v. Terrazas added that the government must prove the person specifically intended to give up U.S. nationality when performing an act the statute lists.3U.S. Department of State. U.S. Citizenship Laws and Policy
The practical result is a strong presumption in your favor. When an American naturalizes in another country or takes a routine oath tied to that citizenship, the State Department presumes the person intends to keep U.S. nationality.4U.S. Department of State. Relinquishing U.S. Nationality Abroad Loss of citizenship in modern practice happens almost entirely through formal renunciation.
What Actually Limits the Number
Because the U.S. sets no cap, the count is controlled by the other governments. Some countries do not allow their citizens to hold a second nationality at all; the file names Japan, China, and India among them. Others let you hold multiple citizenships but attach conditions, such as mandatory military service or tax residency. Before pursuing a new passport, check that country’s rules on dual nationality and what obligations come with it.
How Americans Pick Up Additional Citizenships
Most second and third citizenships come through one of a handful of routes:
- Birth in a country that grants citizenship by place of birth, on top of the U.S. citizenship inherited from American parents.
- Descent from a parent, grandparent, or in some cases more distant ancestor. Italy, Ireland, and Poland are well-known ancestry routes.
- Naturalization abroad after meeting a country’s residency, language, and other requirements. Timelines range from a few years to a decade or more.
- Marriage to a foreign national, which in many countries now still requires residency and language milestones rather than granting citizenship automatically.
- Citizenship or residency by investment. Caribbean programs in St. Kitts and Nevis, Dominica, and Grenada start in the $200,000 to $250,000 range, while Malta and Greece offer residency tied to real estate or government-fund investments.
None of these puts your U.S. citizenship at risk on its own. The State Department confirms that acquiring foreign citizenship through these paths carries no legal consequence for American nationality.1U.S. Department of State. Dual Nationality
When Adding a Citizenship Could Cost You U.S. Status
Loss of U.S. nationality requires two things at once: you voluntarily perform one of the acts listed in the Immigration and Nationality Act, and you do it intending to give up your citizenship.3U.S. Department of State. U.S. Citizenship Laws and Policy The statute lists seven expatriating acts, including naturalizing in a foreign country after 18, swearing allegiance to a foreign government, serving as an officer in a foreign military or in one at war with the U.S., accepting a foreign government job that requires an oath or the country’s nationality, formally renouncing before a consular officer, formally renouncing in writing during wartime with Attorney General approval, and being convicted of treason.5Office of the Law Revision Counsel. 8 USC 1481 – Loss of Nationality by Native-Born or Naturalized Citizen
Performing one of these acts is not enough by itself. Without proven intent to abandon U.S. citizenship, you keep it. That is why a second, third, or fourth naturalization does not, in practice, threaten your American status.
The Obligations That Come With Each Citizenship
U.S. Taxes on Worldwide Income
The United States taxes its citizens on income earned anywhere in the world, regardless of where they live. An American citizen employed in Germany, paying German tax, and holding German citizenship still owes an annual U.S. return.6Internal Revenue Service. U.S. Citizens and Resident Aliens Abroad The same general rules cover income, estate, and gift tax filings as apply to residents at home.7Internal Revenue Service. U.S. Citizens and Residents Abroad – Filing Requirements
Two mechanisms soften the double hit. The Foreign Earned Income Exclusion lets qualifying Americans abroad exclude up to $132,900 in earned income for tax year 2026.8Internal Revenue Service. IRS Releases Tax Inflation Adjustments for Tax Year 2026 The Foreign Tax Credit offsets your U.S. bill by the income tax you already paid to the other country.6Internal Revenue Service. U.S. Citizens and Resident Aliens Abroad Both require actually filing the return; skip the filing and you forfeit them.
Foreign Account Reporting
Two separate reporting rules catch dual citizens off guard. If your foreign financial accounts, combined, exceed $10,000 at any point in the year, you owe an FBAR (FinCEN Report 114), filed electronically through the BSA E-Filing system rather than with your tax return.9Internal Revenue Service. Report of Foreign Bank and Financial Accounts (FBAR) Non-willful violations run up to $10,000 per account per year, and willful violations reach the greater of $100,000 or 50% of the account balance.10Office of the Law Revision Counsel. 31 USC 5321 – Civil Penalties
The Foreign Account Tax Compliance Act adds Form 8938, filed with your tax return, at higher thresholds that vary by filing status and residence.11Internal Revenue Service. Do I Need to File Form 8938, Statement of Specified Foreign Financial Assets A single filer in the U.S. hits the threshold at $50,000 in foreign assets on the last day of the year or $75,000 at any point; a married couple filing jointly in the U.S. at $100,000 or $150,000; a single filer abroad at $200,000 or $300,000; and a married couple abroad at $400,000 or $600,000. FBAR and Form 8938 are separate obligations with different thresholds, filing systems, and penalties. Many overseas Americans file the return and miss the FBAR entirely for years.
Passports
Federal regulation requires U.S. citizens to enter and leave the United States on a U.S. passport, even when they hold a foreign one.12eCFR. 22 CFR Part 53 – Passport Requirement and Exceptions In practice, dual citizens carry both and switch at each border.
Selective Service
Male U.S. citizens and dual nationals aged 18 to 25 must register with the Selective Service System within 30 days of their 18th birthday, whether they live in the U.S. or abroad.13Selective Service System. Who Needs to Register Holding another citizenship is not an exemption. Missing registration can later block federal student aid, federal employment, and naturalization for those still pursuing it.
Jury Duty
Dual citizenship does not exempt you from federal jury service. The qualification is U.S. citizenship, and holding another one is irrelevant.14United States Courts. Juror Qualifications, Exemptions and Excuses Living abroad usually supports a request to be excused, but you still have to respond to the summons.
Social Security Overlap
Working abroad can mean paying into two social security systems on the same earnings. The U.S. has totalization agreements with roughly 30 countries, including Canada, Germany, Australia, and the United Kingdom, that eliminate that double payment and let workers combine credits from both systems toward retirement benefits.15Social Security Administration. U.S. International Social Security Agreements
Limits on U.S. Help Abroad
One consequence of holding more than one citizenship is easy to miss. In the country of your other nationality, that country generally has the dominant claim over you, and the U.S. may not be able to intervene without its consent. The Foreign Affairs Manual acknowledges that U.S. consular efforts on behalf of a dual national “may or may not be accepted” by the other government.16U.S. Department of State – Foreign Affairs Manual. Dual Nationality Most consular notification treaties do not even require the detaining country to alert the U.S. embassy when the arrested person is also its own citizen. The risk is highest in countries with strained relations with the United States.
Security Clearances
A second citizenship does not automatically disqualify an applicant for a federal security clearance, but it draws scrutiny. Under Security Executive Agent Directive 4, foreign preference is a listed concern, and exercising the rights of a foreign citizenship, such as voting in foreign elections, using a foreign passport, or accepting benefits from a foreign government, can be treated as disqualifying.17Office of the Director of National Intelligence. Security Executive Agent Directive 4 – Adjudicative Guidelines A citizenship acquired passively at birth or through parents weighs in the applicant’s favor, and willingness to renounce the foreign nationality can mitigate concerns. The country involved matters, and different agencies and contractors apply the guidelines differently.
Giving Up U.S. Citizenship
Some dual citizens eventually renounce, often because the worldwide tax and reporting load stops making sense. The process is formal: an in-person appearance at a U.S. embassy or consulate, an oath of renunciation, and a $2,350 fee. The State Department issues a Certificate of Loss of Nationality, and renunciation is not final until approved.4U.S. Department of State. Relinquishing U.S. Nationality Abroad
The IRS then adds its own layer. A “covered expatriate” faces a mark-to-market exit tax that treats most assets as sold the day before expatriation. You become a covered expatriate if any one of three conditions applies: net worth of $2 million or more, average annual net income tax over the prior five years above the inflation-adjusted threshold (roughly $211,000 for 2026), or inability to certify five years of tax compliance.18Internal Revenue Service. Expatriation Tax Form 8854 is required in the year of expatriation and potentially afterward, with a $10,000 penalty for failure to file.19Internal Revenue Service. Instructions for Form 8854 – Initial and Annual Expatriation Statement Renunciation ends the annual filing obligation going forward, but everything through the date of expatriation, including back taxes and any missed FBARs, has to be squared away first.