How to Become a French Citizen as a US Citizen

You can become a French citizen as a US citizen through one of four routes: naturalization after living in France, marriage to a French national, descent from a French parent, or service in the French Foreign Legion. France and the United States both allow dual nationality, so you keep your US passport when you naturalize.¹ Each path has its own residency clock and paperwork, but they share the same core eligibility rules and the same document-heavy filing process.

You Do Not Have to Give Up Your US Citizenship

US law does not force you to choose. Naturalizing in France carries no risk to your American passport.¹ French law is equally permissive and does not require new citizens to renounce their original nationality. You will hold two passports and carry the obligations of both systems, including continued US tax filing.

The Four Paths to French Citizenship

Naturalization After Five Years of Residency

This is the most common route for Americans. You need at least five continuous years of habitual residence in France before you can file.² The clock starts from the date you established habitual residence, not from a first tourist visit. You also need stable employment or financial resources and evidence of genuine integration into French society across that period.

The five-year requirement drops to two years if you completed two years of higher education at a French institution, or if you have rendered exceptional services to France.² Recognized refugees and people from French-speaking countries who speak French as a mother tongue also qualify for reduced timelines.

Marriage to a French National

If you are married to a French citizen, you can apply four years after the wedding, provided the couple has maintained a continuous community of life (living together, both materially and emotionally) since the marriage. The wait extends to five years if you spent any portion of the marriage outside France and your French spouse was not registered with a French consulate abroad, or if you have not lived continuously in France for at least three years since the marriage.³

The marriage must be legally recognized in France, and you must demonstrate French language proficiency. This path results in a declaration of nationality rather than a decree. Different administrative track, same citizenship at the end.

Descent From a French Parent

If at least one parent is a French citizen, French nationality generally passes to you automatically, though you may need a certificate of French nationality to prove it formally. A separate rule covers people born in France to foreign parents: they can claim French nationality at 18 if they have lived in France for at least five years since age 11.²

French Foreign Legion Service

A foreign legionnaire can apply for French nationality after five years of service, provided they have shown good conduct and a willingness to integrate into French society.⁴ It is a narrow path, but it replaces the standard civilian residency requirement.

Baseline Eligibility for Every Applicant

You must be at least 18 when you file. Your criminal record matters on both sides of the Atlantic. French law bars naturalization if you have been sentenced in France to a prison term of six months or more without suspension, or if you have been convicted of terrorism or crimes against France’s fundamental interests.⁵ These bars lift if the conviction has been formally rehabilitated or removed from your record. US convictions will also be examined as part of the overall moral character assessment.

French authorities require B2-level proficiency in French for both naturalization and citizenship by marriage. B2 means you can argue a point, follow French news, and hold a conversation about abstract topics without much strain. You can prove it with a TCF (Test de connaissance du français) result or a DELF/DALF diploma. A degree earned entirely in French may also satisfy the requirement. Medical exemptions exist with a doctor’s certification that a condition prevents you from passing the test.

Documents You Need to Gather

Document preparation is where most applicants underestimate the time and cost. Budget three to six months for this stage alone, particularly for the FBI check, apostilles, and sworn translations.

The standard package includes your birth certificate, marriage certificate if applicable, proof of current and past residency in France (utility bills, lease agreements, tax notices), proof of financial stability (French tax returns, employment contracts), evidence of integration into French society, French language test results, and completed application forms. The Cerfa n°12753 form for naturalization is available from the French Ministry of the Interior’s website, and you can also apply through the ministry’s online platform.⁶

The FBI Background Check

France requires a criminal background check from your country of origin. For Americans, that means an FBI Identity History Summary Check. The FBI charges $12 for the fingerprint-based check.⁷ You submit fingerprints directly to the FBI. The US Embassy in France strongly recommends getting fingerprinted in the United States before moving or during a return visit, because the Embassy does not provide fingerprinting services for private requests.⁸

Once you have the FBI results, you will likely need to send them to the US Department of State for an apostille, then have the apostilled document translated into French by a sworn translator.⁸ The full chain often takes several months.

Apostilles and Sworn Translations

All US-issued documents (birth certificates, court records, the FBI check) need an apostille before French authorities will accept them. In the US, apostilles come from your state’s Secretary of State office or, for federal documents, from the US Department of State. Fees generally run between $5 and $20 per document.

After apostilling, each document must be translated into French by a sworn translator (traducteur assermenté) officially registered with the French courts.⁹ Sworn translations typically cost €30 to €60 per page. A full application can easily run €200 to €400 in translation costs alone.

The Filing Fee

You must purchase a fiscal stamp (timbre fiscal) to submit your application. As of May 1, 2026, the fee is €255.¹⁰ You can buy the stamp online or at a tobacco shop in France.¹¹ If you buy a stamp and do not use it, you can request a refund.

Filing, Interview, and Decision

If you live in France, you file with the prefecture in your department of residence or through the Ministry of the Interior’s online platform.⁶ If you live abroad, you file through the French consulate in your jurisdiction. Keep a complete copy of everything. Once your file is accepted, you receive a receipt (récépissé) that starts the official processing clock.

You will then be summoned for an individual interview at the prefecture, the entretien d’assimilation.¹² It tests your spoken French in a real conversation and assesses your knowledge of French history, culture, and republican values. Expect questions about the colors of the flag, the date of Bastille Day, the national motto, key historical figures, and the structure of government. The interviewer may ask opinion-based questions about topics like secularism (laïcité) and civil liberties. The conversation always ends with some version of the same question: why do you want to become French? There is no written test. The Livret du Citoyen, available free from the Ministry of the Interior, is the standard preparation text.

French authorities have up to 18 months from the date of your receipt to respond to a naturalization application. The timeline drops to 12 months if you can prove at least 10 years of habitual residence in France.⁵ The administration can extend the deadline once by three months. In practice, most applications take 12 to 15 months. If you filed online, you can track the file through your personal space and respond to requests for additional documents through the portal.⁶

If approved, the Ministry of the Interior issues a naturalization decree published in the Journal Officiel de la République Française. Publication is the moment you legally become French. The prefecture then summons you to a citizenship welcome ceremony (cérémonie d’accueil dans la citoyenneté française), where you receive your declaration of nationality.¹² After that, you can apply for a French passport and national identity card.

If Your Application Is Denied

A denial does not close the door. You have two months from the date you are notified of the unfavorable decision to file an administrative appeal (recours hiérarchique) with the Minister responsible for naturalizations.¹³ If you filed online, the appeal must go through your personal space on the portal. If the Minister denies the appeal or does not respond within four months, you have two months to bring the case before the Administrative Tribunal of Nantes, which has exclusive national jurisdiction over citizenship denial cases.¹⁴ The tribunal cannot order the government to grant citizenship, but it can annul the decision and force the administration to re-examine the file.

Your US Tax Obligations Do Not Go Away

Many new dual citizens discover this too late. The United States taxes its citizens on worldwide income regardless of where they live. Becoming French and moving to France full-time does not reduce your US tax filing obligations by a single form.¹⁵ You will file both French and US returns every year. The US-France tax treaty helps prevent double taxation on most income, and the foreign earned income exclusion lets qualifying Americans abroad exclude a substantial amount of earned income from US tax. The filing requirement itself never goes away.

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 (FBAR, FinCEN Form 114) with the Treasury Department.¹⁶ The threshold is aggregate and counts every foreign account you have signature authority over, including a basic French checking account. Living in France almost guarantees you will cross the line.

Under FATCA, if you live abroad and your foreign financial assets exceed $200,000 on the last day of the tax year (or $300,000 at any point), you must report them on IRS Form 8938. For married couples filing jointly, the thresholds are $400,000 and $600,000.¹⁷ Penalties for missed filings are steep. Streamlined compliance procedures exist for taxpayers living abroad who have never filed and should have.

On the French side, becoming a tax resident exposes your worldwide real estate holdings to the Impôt sur la Fortune Immobilière (IFI). New French tax residents get a five-year exemption on real estate held outside France, so US property is not assessed during that initial window. After five years, your global real estate portfolio is in scope.

1
U.S. Department of State. Dual Nationality
2
Service Public. How to Obtain French Nationality
3
Service Public. French Nationality by Marriage
4
Légion Étrangère. Becoming a Legionnaire – Frequently Asked Questions
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Service Public. French Naturalization by Decree
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Service Public. Online Application for French Naturalization or Reintegration Into French Nationality
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Federal Register. FBI Criminal Justice Information Services Division User Fee Schedule
8
U.S. Embassy and Consulates in France. FBI Background Check and Fingerprinting Services
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Réfugiés.info. Obtain an Official Translation of a Document
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Service Public. Comment Acheter un Timbre Fiscal pour une Demande de Nationalite
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Service Public. Foreigner in France – How to Buy a Tax Stamp
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Réfugiés.info. Apply for French Nationality
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Service Public. French Naturalization by Decree
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Tribunal Administratif de Nantes. Le Tribunal Administratif de Nantes
15
Internal Revenue Service. US Citizens and Residents Abroad Filing Requirements
16
Internal Revenue Service. Report of Foreign Bank and Financial Accounts (FBAR)
17
Internal Revenue Service. Summary of FATCA Reporting for US Taxpayers