A dual citizenship application is the process of formally claiming nationality in a second country while keeping your existing citizenship, and for U.S. citizens it is legal so long as you don’t voluntarily intend to give up your American status. The route you use depends on your connection to the second country: birth on its soil, descent from a citizen, long-term residence leading to naturalization, or a qualifying financial investment. Before filing anything, confirm the second country actually permits dual nationality, because a handful of governments will force you to choose. The State Department acknowledges that dual nationality is lawful but cautions that it “may hamper efforts by the U.S. Government to provide diplomatic and consular protection to individuals overseas.”1U.S. Department of State. 7 FAM 080 Dual Nationality That warning, along with tax and reporting obligations that follow you across borders, is the part most applicants underestimate.
The Four Routes to a Second Citizenship
Every application starts with figuring out which claim you can actually make.
Birth on a country’s soil. Some nations grant citizenship automatically to anyone born within their borders. The United States does this under 8 U.S.C. § 1401, which makes any person born in the U.S. and subject to its jurisdiction a citizen at birth.2Office of the Law Revision Counsel. 8 USC 1401 – Nationals and Citizens of United States at Birth A number of other countries, mostly in the Americas, follow a similar rule.
Descent from a citizen. Many countries let you claim nationality through a parent or grandparent, sometimes further back, even if you were born elsewhere. Italy’s citizenship law allows descendants of Italian citizens to apply for recognition through lineage, provided the chain of nationality was never formally broken.3Global Citizenship Observatory. Italy Act No. 91 of 5 February 1992 Ireland, Poland, Hungary, and others have their own descent rules, with different generational limits and documentation demands.
Naturalization. With no birth or ancestral claim, you can earn citizenship by living in a country long enough and meeting its residency, language, and character requirements. In the United States, the standard is five years of continuous residence as a lawful permanent resident, dropping to three years if you are married to a U.S. citizen.4U.S. Citizenship and Immigration Services. Continuous Residence and Physical Presence Requirements for Naturalization Other countries commonly require three to ten years.
Citizenship by investment. A smaller group of countries, mostly in the Caribbean, offer citizenship in exchange for a significant financial contribution, generally a donation to a national fund or a qualifying real estate purchase. Minimum contributions typically start around $130,000 and climb well past $400,000 depending on the country and investment type. Processing can be fast, sometimes under six months, but terms shift frequently and international scrutiny of these programs has grown.
Confirm the Other Country Allows Dual Nationality
This is the single biggest trap in the process. Naturalizing in a country that prohibits dual citizenship can force you to give up your existing nationality, and there is no reversing it once the renunciation is complete.
China, Japan, Singapore, India, and several Gulf states including Saudi Arabia and the UAE enforce strict single-citizenship policies. Austria and the Netherlands also restrict dual nationality, though both carve out exceptions for circumstances such as birth or marriage. India does not permit dual citizenship but offers an Overseas Citizenship of India card that grants many practical benefits short of full nationality. Verify your target country’s current rules before you start collecting documents, since these policies do change.
Keeping Your U.S. Citizenship Through the Process
Federal law identifies specific acts that can result in losing U.S. nationality, but only if you perform them voluntarily and with the intent to give up citizenship. Under 8 U.S.C. § 1481, those acts include obtaining naturalization in a foreign country, taking an oath of allegiance to a foreign government, serving as an officer in a foreign military, and formally renouncing citizenship before a U.S. consular officer abroad.5Office of the Law Revision Counsel. 8 USC 1481 – Loss of Nationality by Native-Born or Naturalized Citizen
Intent is the pivot. Simply acquiring a second passport does not automatically forfeit your American citizenship. The State Department presumes that a U.S. citizen who naturalizes in another country intends to keep both nationalities unless that person explicitly states otherwise. That protection is a matter of U.S. law only. The other country may treat the oath you take there as a renunciation of your prior nationality under its own rules, so get advice specific to both countries before proceeding.
Documents You Will Need to Gather
Every dual citizenship application comes down to proving who you are, where you were born, and how you connect to the country whose citizenship you want. Exact requirements vary, but the core package is similar everywhere:
- Certified birth certificates for you, and often for parents and grandparents in descent-based claims, issued by the vital records office with a raised seal or official stamp.
- Marriage and divorce records, needed to trace name changes and establish an unbroken familial chain across generations.
- Proof of your current nationality, usually a valid passport or certificate of naturalization.
- Residency evidence, documenting everywhere you have lived for the past five to ten years for naturalization-based claims.
- Ancestor naturalization records for descent claims. Italian consulates, for example, often require your Italian ancestor’s naturalization certificate from the country they immigrated to, to prove they had not already renounced Italian citizenship before your line was born.
Name discrepancies between documents cause more delays than anything else. If your birth certificate says “Katherine” and your marriage license says “Catherine,” you need a legal affidavit or a court-issued name correction to reconcile them. Organize the whole package chronologically so a reviewing officer can trace the lineage without hunting.
Each government has its own application paperwork. U.S. naturalization uses Form N-400, filed through USCIS.6U.S. Citizenship and Immigration Services. N-400, Application for Naturalization Italian consulates use a formal request for recognition of citizenship (the “richiesta riconoscimento della cittadinanza italiana”) along with several supplementary declarations depending on whether your Italian ancestor is living or deceased.7Ministero degli Affari Esteri e della Cooperazione Internazionale. Cittadinanza per Discendenza Iure Sanguinis Always download forms from the official government portal. Outdated versions circulate on third-party sites.
Authentication and Translation
A birth certificate from Ohio means nothing to an Italian consular officer unless it has been officially verified for international use. That verification is called an apostille, created by the 1961 Hague Convention to replace the older diplomatic authentication chain.8HCCH. Apostille Section The apostille is a standardized certificate attached to your document confirming that the signature and seal on it are genuine.
In the United States, the Secretary of State in the state that issued the document handles apostille requests. Fees generally range from $5 to $20 per document, and processing times vary significantly by state. Some offer walk-in service; others take weeks by mail. Start this step early.
If the receiving country uses a different official language, you also need certified translations. The translator must sign a statement confirming the translation is complete and accurate and that they are competent in both languages.9U.S. Department of State. Information About Translating Foreign Documents The certification should include the translator’s printed name, signature, and contact information; some consulates require the translation on official letterhead. A document without both an apostille and a certified translation will be rejected.
Filing and Processing Times
How you submit depends on which country’s citizenship you are pursuing. Form N-400 for U.S. naturalization can be filed online or by mail, with a filing fee of $710 online or $760 for a paper submission, and fee waivers available for applicants who qualify based on income.6U.S. Citizenship and Immigration Services. N-400, Application for Naturalization
Foreign applications often require an in-person consulate appointment, and those appointments are usually the bottleneck. Italian consulates in the United States have wait times that can stretch into years. Book as early as you can, and check the consulate’s website regularly for cancellations. Some consulates now allow document uploads through an online portal before or in place of the in-person visit. When mailing originals, use a tracked courier and keep complete copies of every document, since replacing a certified, apostilled birth certificate from a century ago is not a fast fix.
Processing times vary widely by route. U.S. naturalization through USCIS currently averages roughly 6 to 14 months from filing to oath ceremony, though some field offices run longer. Italian consulates can take two to five years for ancestry-based claims. Some countries process investment-based applications in under six months. Once your file is in the system, there is generally no way to speed it up.
Travel Restrictions During U.S. Naturalization
If you are the one applying for U.S. citizenship, time abroad still matters after you file. Any single trip lasting more than six months creates a presumption that you broke your continuous residence, and USCIS can use that to deny your application. You can rebut the presumption with evidence of maintained ties, such as your job, home, and immediate family in the U.S.10U.S. Citizenship and Immigration Services. USCIS Policy Manual Volume 12 Part D Chapter 3 – Continuous Residence A trip of one year or more automatically breaks continuous residence and resets the residency clock entirely, unless you filed an approved Form N-470 to preserve it before leaving.
After You File: Checks, Interview, and Oath
For U.S. naturalization, USCIS runs criminal background checks through the FBI and other interagency databases, and you will be scheduled for a biometrics appointment where your fingerprints, photograph, and signature are collected at a local Application Support Center.11U.S. Citizenship and Immigration Services. USCIS Policy Manual Volume 12 Part B Chapter 2 – Background and Security Checks The FBI clearance must post before your interview is scheduled. Some countries require an FBI Identity History Summary as part of the application package even when the citizenship claim is not through the U.S.
The USCIS interview is where the real evaluation happens for American naturalization. An officer reviews your N-400, asks about your background and residency history, and administers a two-part test covering English proficiency and civics knowledge.12U.S. Citizenship and Immigration Services. The Naturalization Interview and Test The English portion has three components: speaking (evaluated during the interview conversation), reading (one of three sentences read aloud correctly), and writing (one of three sentences written correctly). The civics test is oral: 20 questions drawn from a list of 128, with at least 12 correct required to pass. If you fail either portion, you get one more chance 60 to 90 days later.
Certain applicants can skip the English requirement. If you are 50 or older and have held a green card for at least 20 years, or 55 or older with at least 15 years as a permanent resident, you take the civics test in your native language with an interpreter. Applicants 65 or older with 20 years of permanent residence receive special consideration on the civics portion. Those with qualifying physical or mental disabilities may be exempt from both tests by filing Form N-648 with a licensed physician’s certification.13U.S. Citizenship and Immigration Services. Exceptions and Accommodations
The final U.S. step is a public ceremony where you take the Oath of Allegiance. The oath text includes language about renouncing allegiance to foreign governments, but as a practical matter it does not automatically terminate your other citizenship. Whether the other country treats the U.S. oath as a relinquishment of its nationality depends on that country’s own laws.14U.S. Citizenship and Immigration Services. USCIS Policy Manual Volume 12 Part J Chapter 2 – The Oath of Allegiance After the ceremony you receive a Certificate of Naturalization, which is your primary proof of citizenship and lets you apply for a U.S. passport. Foreign governments have their own oath or affirmation requirements and issue equivalent documentation.
If Your Application Is Denied
A USCIS denial of Form N-400 is not the end. You can request a hearing before a different immigration officer by filing Form N-336 within 30 calendar days of receiving the denial, or 33 days if the decision was mailed.15U.S. Citizenship and Immigration Services. Request for a Hearing on a Decision in Naturalization Proceedings Under Section 336 of the INA At that hearing you can submit new evidence or argue the original officer made an error. Miss the window and USCIS will generally reject the request without refunding the fee, though a late filing may be treated as a motion to reopen or reconsider if it meets those standards. If the hearing also results in denial, you can seek judicial review by filing a petition in federal district court. For foreign citizenship denials, appeals processes vary entirely by country, and some provide none at all.
What Changes Once You Hold Two Citizenships
U.S. Taxes Follow You
The United States taxes its citizens on worldwide income regardless of where they live. If you hold U.S. citizenship and add a second nationality, your U.S. tax obligations do not disappear because you move abroad or earn income in another country.16Internal Revenue Service. U.S. Citizens and Residents Abroad Filing Requirements You keep filing a U.S. federal return every year. Foreign tax credits and the Foreign Earned Income Exclusion can reduce double taxation but do not eliminate the filing requirement.
Foreign Account Reporting
If the combined value of your foreign financial accounts exceeds $10,000 at any point during the year, you must file a Report of Foreign Bank and Financial Accounts (FinCEN Form 114, the FBAR) with the Treasury Department by April 15, with an automatic extension to October 15.17FinCEN.gov. Report Foreign Bank and Financial Accounts Non-willful violations carry fines up to $10,000 per account per year; willful violations can reach 50 percent of the account balance or $100,000 per violation, whichever is greater.
Separately, FATCA requires Form 8938 with your tax return if your foreign financial assets clear certain thresholds. For U.S. residents that trigger is $50,000 on the last day of the year or $75,000 at any point, and double for married couples filing jointly. For filers living overseas, thresholds run to $200,000 or $300,000 for singles, and $400,000 or $600,000 for joint filers.18Internal Revenue Service. Summary of FATCA Reporting for U.S. Taxpayers FBAR and Form 8938 are separate filings with different thresholds sent to different agencies, and you may owe both. Dual citizens who open a bank account in their second country routinely trigger these requirements without knowing.
Limits on U.S. Consular Help
When you are inside the country of your other nationality, that country generally has the predominant claim on you under international practice. The State Department will still try to provide consular services to dual nationals but warns that the ability to assist “may be limited” and that the other country may not recognize your U.S. citizenship at all.1U.S. Department of State. 7 FAM 080 Dual Nationality If you get detained, face conscription, or run into legal trouble in your second country, the U.S. embassy may have limited leverage. Know the obligations attached to your other nationality, including any mandatory military service, before you travel there.
Security Clearances
If you hold or plan to seek a U.S. security clearance, dual citizenship draws extra scrutiny under Security Executive Agent Directive 4, particularly Guideline B (Foreign Influence) and Guideline C (Foreign Preference).19Office of the Director of National Intelligence. Security Executive Agent Directive 4 Adjudicative Guidelines Dual citizenship alone is not an automatic disqualifier, but how you exercise it matters: holding a foreign passport, voting in foreign elections, accepting foreign government benefits like healthcare or education subsidies, and serving in a foreign military all raise concerns. Full disclosure is essential. Failing to report a foreign passport, or giving inconsistent answers between your SF-86 and follow-up interviews, is treated far more seriously than the dual citizenship itself. Enter and exit the United States on your U.S. passport regardless of how many others you hold.