Country guide · France

The French 50-year rule: when citizenship by descent runs out (Article 30-3)

Michael Soucek·Last reviewed October 2026

Educational information only — not legal advice. Always verify with the relevant authority, consulate or registry office.

French citizenship passes down with no generation limit, but it doesn’t survive forever unused. Under Article 30-3 of the Civil Code, if your French line has been settled outside France for more than 50 years, and neither you nor your French parent was ever treated as French (no French passport, ID card, consular registration and the like), you can no longer prove French nationality by descent, and the court must record that it was lost. This is the “50-year rule”, or loss by désuétude (disuse), and it is what ends most grandparent and great-grandparent claims.

If the rule has caught your line, there is still a way back: a declaration under Article 21-14 for people with real ties to France. If it hasn’t, you prove your nationality with a certificate of French nationality (CNF). Both are covered below. For the wider picture, start with our French citizenship by descent guide.

What Article 30-3 of the Civil Code says

The article has two sentences. In French:

« Lorsqu’un individu réside ou a résidé habituellement à l’étranger, où les ascendants dont il tient par filiation la nationalité sont demeurés fixés pendant plus d’un demi-siècle, cet individu ne sera pas admis à faire la preuve qu’il a, par filiation, la nationalité française si lui-même et celui de ses père et mère qui a été susceptible de la lui transmettre n’ont pas eu la possession d’état de Français.

Le tribunal devra dans ce cas constater la perte de la nationalité française, dans les termes de l’article 23-6. »

In plain English: if you live (or have lived) abroad, and the ancestors you get French nationality from have stayed settled abroad for more than half a century, you aren’t allowed to prove French nationality by descent unless you, or the parent who could have passed it to you, had the possession d’état of a French national. In that case the court has to record that French nationality was lost.

Article 23-6 is the matching rule on loss. It lets a court record the loss of French nationality for someone French by descent who doesn’t have possession d’état and has never lived habitually in France, where the ancestors they got it from have had neither possession d’état nor residence in France for half a century. The judgment fixes the date it was lost, and it can decide that it was already lost by your ancestors, so that you were never French at all.

The conditions, one by one

The rule bites only when all of these are true:

  1. You live or have lived abroad. Article 23-6 applies only to someone who has never had their habitual residence in France.
  2. Your French ancestors in the line have been settled abroad for more than 50 years. A grandparent or parent who moved back to France within that time means the line wasn’t settled abroad for half a century. The Cour de cassation has held that this residence condition isn’t limited to your direct parent; it looks at the ancestors in the French branch.
  3. Neither you nor your French parent had possession d’état within those 50 years. Article 30-3 names only these two people. A grandparent’s own old French passport isn’t mentioned, although Article 23-6 looks at ancestors more broadly, so if your case rests on a grandparent’s papers, get advice from a French nationality lawyer.

How the 50 years are counted

  • The clock starts when the French line settled abroad. According to the Conseil constitutionnel’s commentary on its 2025 decision, the Cour de cassation counts the 50 years from the first day of expatriation (or, for former French territories, from the first day of independence; for Algeria, the 50 years ran out on 4 July 2012) and assesses them on the day the court case is filed.
  • The 50 years don’t have to have run before you were born. They can run out during your lifetime, which is how someone can be French at birth and later be unable to prove it.
  • Nothing after the deadline counts. Since a June 2019 ruling, the Cour de cassation treats Article 30-3 as an irrebuttable presumption of loss. A passport, consular registration, or even a court judgment recognising your parent as French that comes after the 50 years are up is ignored, even if the application was started before the deadline.
  • Minor children are protected in one case. The rule can’t be used against children who are minors when the court case is filed if it hasn’t first been used against their parent.

What counts as possession d’état de Français?

The Civil Code doesn’t define it. Courts treat it as behaving as a French national and being treated as one by French public authorities, judged from the evidence as a whole. Service-public.fr gives these examples of proof for you and your parent:

  • a French national ID card or passport
  • a French electoral card
  • a consular card, or registration on the register of French nationals living abroad
  • French military documents
  • a certificate of French nationality

The Conseil constitutionnel’s commentary adds the registration of your civil-status records (such as a birth transcribed by a consulate) in the French registers. It also notes legal writing that short trips to France don’t count on their own. Because the law looks at half a century without these ties, keep French documents current once you have them rather than letting a long gap open up again.

Grandparent and great-grandparent claims: how it plays out

Two hypothetical families show how the dates work:

  • A grandmother who settled in the US in 1965. She stayed French (she never naturalized before 1973). Her son, born in the US, never had a French passport or consular registration, and neither did his daughter. The 50 years ran out in 2015. The daughter can no longer prove French nationality by descent, and a passport her father got in 2020 wouldn’t change that. Her route is an Article 21-14 declaration, if she has real ties to France.
  • A grandfather who settled in Canada in 1990. The 50 years won’t run out until 2040. His grandchild can still apply for a certificate of French nationality now, and once the parent or grandchild holds French documents, the line has possession d’état inside the window.

Great-grandparent lines usually look like the first family: the ancestor left France long ago, and unless someone in the last two generations was treated as French, the rule has already applied. These lines also often break earlier, because before 9 January 1973 a French adult who voluntarily took another nationality generally lost French nationality, and before 10 August 1927 a French woman who married a foreigner automatically lost hers. See how to prove an ancestor never naturalized and our general guides to citizenship through grandparents and great-grandparents.

Is the rule still in force? The 2025 Conseil constitutionnel decision

Yes. In decision 2025-1130/1131/1132/1133 QPC of 11 April 2025, the Conseil constitutionnel upheld Article 30-3 as the Cour de cassation applies it. It accepted that ending the transmission of a nationality with no real effect serves the general interest, and it relied on three safeguards: the judge must check the conditions and weigh your evidence of possession d’état within the 50 years; the judge can’t record a loss that would leave you stateless; and you can still reclaim French nationality by declaration under Article 21-14. Most readers of this site hold another citizenship, so the statelessness safeguard won’t help them.

If the rule applies: reclaiming by declaration (Article 21-14)

Article 21-14 lets people who lost French nationality under Article 23-6, or who were refused under Article 30-3, claim French nationality by declaration. You must have either:

  • kept or acquired manifest ties with France of a cultural, professional, economic or family nature, or
  • actually served in a unit of the French army, or fought in French or allied armies in wartime.

The surviving spouse of someone who did that military service or fought can also use it. The law doesn’t list what proves “manifest ties”, so expect to document real, ongoing links such as family in France, regular stays, work or study connected to France, or French-language study.

Under Article 26, the declaration is made before the registry of a tribunal judiciaire or before a French consul, so from the US, Canada or Australia you file it at your French consulate. A receipt is issued once your documents are complete. On service-public.fr’s page for the closely related reintegration declaration, the authorities have six months from that receipt to register or refuse it, a refusal can be challenged in court within six months (a lawyer is required), and a registered declaration takes effect from the date you signed it. That page is about Article 24-2, not 21-14, and service-public.fr has no separate page for the 21-14 declaration, so ask your consulate for its own document list.

Two things to know: this is an acquisition, so you are French from the declaration, not from birth; and it is not the same as reintegration by decree, which requires you to live in France when the decree is signed, pass a civic exam and pay a €255 stamp duty.

If the rule doesn’t apply: get a certificate of French nationality

A certificate of French nationality (CNF) is the legal proof that you are French. A passport or ID card is only a presumption. If you were born abroad and live abroad, you apply to the nationality service (Pôle de la nationalité) of the Tribunal judiciaire de Paris, Parvis du Tribunal, Paris 17e. Official pages give different email addresses and phone numbers for it, so check the current contact in the service-public.fr directory before writing.

  1. Fill in, date and sign form cerfa 16237 after reading notice 52373. You must give an email address.
  2. Gather full-copy civil records (birth, marriage, death) for each generation from the French ancestor to you, in the original language, plus your ID, a recent colour photo and proof of address. Records from France can be ordered from the French civil registry; see our documents checklist.
  3. Add evidence of possession d’état for you and your French parent: passports, ID cards, consular registration, electoral cards, military papers. With the 50-year rule, this is often the deciding part of the file.
  4. Have foreign-language documents translated into French by a translator approved by a French court of appeal, and get apostilles where France requires them. See the apostille guide and certified translations.
  5. Send the originals by post (or hand them in). The consulate may ask to see originals. The procedure is free.

Timeline. The registry has six months from the receipt it issues once your file is complete, and can extend that twice by the same period: up to 18 months in all. Silence at the end counts as a refusal. A refusal can be appealed to the Paris court within six months, through a lawyer. If the registry refuses because of Article 30-3, the court will apply the same rule, which is when Article 21-14 becomes your route.

France allows dual citizenship, so a successful claim doesn’t cost you your current one. See dual citizenship by descent.

Frequently asked questions

What is the 50-year rule for French citizenship by descent?

Article 30-3 of the French Civil Code. If you live or have lived abroad, and the French ancestors you would inherit nationality from have been settled abroad for more than half a century, you are not allowed to prove French nationality by descent unless you or your French parent had the “possession d’état de Français”, meaning you were treated as French by French authorities (a passport, ID card, consular registration and so on). The court must then record that French nationality was lost.

How many generations back can French citizenship by descent go?

There is no generation limit in the law. Article 18 says a child with at least one French parent is French, and that can repeat in every generation. In practice the 50-year rule is the limit: once a French line has been settled abroad for more than 50 years without anyone in it being treated as French, the claim can no longer be proved.

Can I get French citizenship through my grandparent?

Possibly. Your parent would have been French at birth through your grandparent, and you through your parent. The question is whether the 50-year rule has already caught your line: if your grandparent settled abroad more than 50 years ago and neither you nor your parent ever had a French passport, ID card, consular registration or similar, you can no longer prove it by descent. If the 50 years haven’t run yet, act before they do.

Can I get French citizenship through a great-grandparent?

Rarely by descent. Most great-grandparent lines have been abroad for well over 50 years, and unless you or your parent was treated as French within that time, Article 30-3 bars the claim. Pre-1973 naturalizations abroad also broke many of these lines. If the rule applies, the realistic route is a declaration under Article 21-14, which requires manifest ties with France.

What counts as possession d’état de Français?

Behaving as a French national and being treated as one by French public authorities. Service-public.fr lists examples such as a French ID card, passport, electoral card, consular card or registration on the register of French nationals abroad, military documents or a certificate of French nationality. The court weighs the evidence as a whole. Under Article 30-3 it is your own and your French parent’s possession d’état that matters.

Can I get French nationality back if the 50-year rule applies?

Yes, by declaration under Article 21-14 of the Civil Code, if you have kept or acquired manifest cultural, professional, economic or family ties with France (or served in the French army, or fought in French or allied forces in wartime). From abroad you file it with the French consulate. It gives you French nationality from the declaration, not from birth.

How long does a certificate of French nationality take?

The court registry has six months from the receipt it issues once your file is complete, and it can extend that twice by the same period, so up to 18 months in all. If no decision arrives by then, the application counts as refused. The procedure is free.

Official sources

Checked against these sources on 24 October 2026. Légifrance blocked automated access that day, so the article texts were read in the Conseil constitutionnel’s reproduction. Case law on Article 30-3 keeps developing; confirm your situation with the Paris nationality service, your French consulate or a French nationality lawyer before you rely on it.