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Belgian Naturalization by Marriage

Belgium Citizenship

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At a glance

Belgium's marriage nationality declaration is for spouses of Belgian citizens who have built a life in Belgium. It generally requires five years of legal residence, three years living together in Belgium with the Belgian spouse, language ability, and social-integration proof.

Type
Citizenship through marriage
Relationship fit
Spouses or partners of a qualifying Belgium citizen
Core requirements
Marriage or partnership records and the sponsor's citizenship
What to know
Marriage alone rarely guarantees approval

Summary

A foreign spouse of a Belgian citizen can acquire Belgian nationality through a declaration of nationality under Article 12bis §1, 3° of the Code de la nationalité belge (CNB). This is still a 5-year legal-residence route, but it replaces the standard economic-participation requirement with the marriage or Belgian-child basis. The couple must also have lived together in Belgium for 3 years. Time the couple spent together abroad does not count.

The rest of the requirements substantially mirror the standard 5-year track: A2-level Dutch, French, or German, plus proof of social integration. Marriage does not waive the language or integration requirements. If you rely on 400+ hours of vocational training for social integration, Belgium also expects a smaller work record: at least 234 paid workdays in the last 5 years, or 3 quarters of Belgian self-employed social-security contributions.

Dual citizenship is permitted (since 2008), so U.S. applicants don't renounce.

Eligibility

Registered partnership (cohabitation légale / wettelijke samenwoning) does not qualify for this track — only civil marriage does. Partnered couples can still use the standard 5-year residence track.

What This Route Allows

If approved, this route can lead to citizenship in Belgium. Citizenship is the national status itself, not a residence permit: you can document the citizenship, apply for citizen identity or passport documents, and live in Belgium without a separate immigration permit.

What This Route Is Not

This is not automatic citizenship. Naturalization, registration, and restoration routes usually require an application, supporting documents, and a decision by the relevant authority.

Next Steps

  1. Confirm the cohabitation clock — the 3-year count depends on registered cohabitation in Belgium with your Belgian spouse. Pull the historique communal for both spouses.
  2. Ensure the marriage is registered in Belgium — if you married abroad, the foreign marriage certificate must be transcribed into the Belgian civil registry at your commune.
  3. Secure language proof — A2 applies. The integration course covers both language and integration in one step.
  4. Complete the integration course if you haven't already — inburgering (Flanders), parcours d'intégration (Wallonia), or the Bureau d'accueil pour primo-arrivants (Brussels).
  5. Get certified translations — any non-Belgian civil records must be officially translated into Dutch, French, or German and apostilled.
  6. File at your commune — the declaration is lodged with the officier de l'état civil of the commune where you're registered. The federal fee is currently €1,000, plus possible local document, translation, or copy costs.
  7. Respond to any parket review — the Crown Prosecutor's office can object to the declaration. Marriage-route files are occasionally flagged for genuineness review; keep your cohabitation documentation (shared leases, utility bills, tax filings) accessible.
  8. Register in the Registre National and apply for a Belgian passport at your commune.

Sources