EU citizenship derivative rights (Article 20 TFEU framework)

This route concerns Belgian citizenship by descent and the European Union citizenship rights that flow from it. Belgian nationality is acquired at birth by jus sanguinis transmission from a Belgian-national parent under Article 8 of the Code de la nationalité belge (CNB), the federal nationality code enacted by the Loi du 28 juin 1984 (M.B. 12 juillet 1984) and amended since, including by the Loi du 4 décembre 2012 and the Loi du 18 juin 2024.

Because nationality is an exclusive federal competence under Article 8 of the Belgian Constitution, the same rules apply throughout the country, but they are administered locally through the municipal civil registrar in each of the linguistic communities — the Communauté française (FR), the Vlaamse Gemeenschap (NL), and the Deutschsprachige Gemeinschaft (DE). A person who is already a Belgian resident files through the municipal civil status office; a person abroad files through a Belgian consulate.

Gender equality in descent transmission was established by the De Wachter reform (Loi du 13 juin 1991). For the earlier cohort affected by the pre-1991 patrilineal asymmetry, the Cour de cassation confirmed on 8 October 2020 that the equal-transmission rule applies retroactively. The later reforms refined the broader nationality framework: the Loi du 4 décembre 2012 introduced a continuous-integration pathway in place of the earlier declaration regime, and the Loi du 18 juin 2024 codified into Belgian law the proportionality framework drawn from the Court of Justice's Tjebbes (C-221/17) and Rottmann (C-135/08) case law.

Holding Belgian nationality automatically confers EU citizenship under Article 20 TFEU, together with the rights attached to it: free movement (Directive 2004/38), the right to vote and stand in European Parliament elections (Article 22(1) TFEU), and the right to vote in municipal elections in any Member State of residence (Article 22(2) TFEU). The outer limits and protections of this status have been shaped by the Court of Justice of the European Union, notably in Rottmann (C-135/08), Tjebbes (C-221/17), Zhu and Chen (C-200/02), and Ruiz Zambrano (C-34/09) — the last of which originated from a Belgian Conseil d'État reference and recognised derivative residence rights for the non-EU parent of a dependent EU-citizen child.

Eligibility framework: thresholds calibrated per Code de la nationalité belge (CNB) — Loi du 28 juin 1984 as amended by Loi du 4 décembre 2012 — CNN regime (5-year continuous integration pathway; replaced declaration regime). Language pillar: Dutch OR French OR German per linguistic community (Loi du 18 juillet 1966). Standard floor: 5 years continuous residence (one of three integration pathways under 2012 CNN regime). Region-specific integration: Region-specific integration: Flemish inburgering (VL) / Walloon parcours d'intégration (W) / Brussels primo-arrivants (BXL). EU-loss proportionality where relevant: CJEU Tjebbes C-221/17 + Rottmann C-135/08 — EU proportionality for nationality loss (codified BE 2024).

Standard documentation set for DSC pathway: ID + foreign passport, residence permit (where applicable), region-specific integration certificate (Flemish inburgering / Walloon parcours / Brussels primo-arrivants / DE-Community Dekret), language proficiency certificate (A2/B1 by sub-pathway), tax records (last 3 years), Procureur du Roi clearance. Filing fee EUR 150. See DOFI Vademecum 'Nationalité' 2025 for comprehensive checklists.

Route-specific documentation requirements: statutory anchor under TFEU Article 20; filiation chain documentation (birth/marriage/death certificates of BE ascendant + parent + applicant); Belgian-civil-registrar verification under Code civil Arts 312-330; DNA testing accepted for contested paternity (Cass. civ. 8 oct 2020 jus sanguinis equality framework). Apostille Aja 1961 for foreign documents + sworn French/Dutch/German translation. Federal Mediator complaint route available (~150 nationality complaints/year); DOFI Vademecum 'Nationalité' provides comprehensive sub-pathway checklists. Filing fee EUR 150 per declaration (Loi 4 décembre 2012 + Royal Decree fee schedule).

Timeline: variable depending on filiation evidence. Article 19 declaration: 3-6 months. Article 8 transmission: typically registered automatically at birth.

Procedural timeline + costs: declaration filed before the Officier de l'état civil (commune) + Parquet (4-month opposition window) + Tribunal de la famille. 4-month opposition window from the Parquet (Procureur du Roi). Decision communicated by registered post; absence of opposition = positive acquisition. Standard administrative fee (droit d'enregistrement) per 2024 Code; final inscription in registres de la nationalité. Anchor: Code de la nationalité belge (CNB) 1984 (Loi du 28 juin 1984) as amended by Loi 4 décembre 2012 (5-year continuous integration regime; replaced 'declaration' regime).

Procedural timeline + costs: declaration filed before the Officier de l'état civil (commune) + Parquet (Procureur du Roi — 4-month opposition window) + Tribunal de la famille. 4-month opposition window from the Parquet (Procureur du Roi). Decision communicated by registered post; absence of opposition = positive acquisition. Standard administrative fee (droit d'enregistrement) per 2024 Code; final inscription in registres de la nationalité. Anchor: Code de la nationalité belge (CNB) — Loi du 28 juin 1984 as amended by Loi du 4 décembre 2012 — CNN regime (5-year continuous integration pathway; replaced declaration regime).

The supranational anchor is Article 20 of the Treaty on the Functioning of the European Union (TFEU), which establishes Union citizenship for every person holding the nationality of a Member State. Articles 20-22 TFEU attach to that status the rights of free movement, of voting and standing in European Parliament elections (Article 22(1)), and of voting in municipal elections in any Member State of residence (Article 22(2)).

The scope and limits of this status have been shaped by the Court of Justice of the European Union:

• Rottmann (C-135/08) and Tjebbes (C-221/17) set the proportionality framework governing loss of nationality where that loss would also entail the loss of Union citizenship.
• Ruiz Zambrano (C-34/09), which originated from a Belgian Conseil d'Etat reference, established derivative residence rights for non-EU parents of a dependent EU-citizen child, and has had direct doctrinal influence on the Belgian family-residence and naturalisation framework.
• Zhu and Chen (C-200/02) addressed the residence rights of an EU-citizen child and the accompanying carer.

Belgian nationality code

The domestic foundation is the Code de la nationalité belge (CNB), enacted by the Loi du 28 juin 1984 and subsequently amended. Belgian descent is transmitted by jus sanguinis under Article 8 CNB. Key framework provisions include Articles 8, 9, 10, 11, 11bis, 12, 12bis, 13, 22, 23, 23/1 and 24.

Later amendments refined this regime:

• The Loi du 4 décembre 2012 introduced the integration-based nationality pathway (a five-year continuous integration route), replacing the earlier declaration regime.
• The Loi du 18 juin 2024 codified the EU proportionality test for loss of nationality into Belgian law, transposing the Rottmann and Tjebbes case law.

Jus sanguinis transmission has also been read in light of sex-equality: the Cour de cassation (civ., 8 October 2020) reaffirmed sex-equality in jus sanguinis across pre-1985 retroactive applications.

Inter-country adoption

Where Belgian nationality is acquired through inter-country adoption, the governing instruments are the Hague Adoption Convention 1993, implemented in Belgium by the Loi du 24 avril 2003, together with the administrative framework set out in the Arrete ministeriel of 1 March 2019.

Allocation of competences

Descent transmission is federal and uniform: the CNB applies identically across the French, Dutch and German language regions, and there is no regional variation in how jus sanguinis operates. Registration is handled by the civil registrar (Officier de l'etat civil / Ambtenaar van de Burgerlijke Stand) at the municipality of birth registration.

By contrast, the integration-certificate requirement that supports certain nationality pathways falls within regional competence under the Article 12bis allocation of competences, and is delivered through the distinct regional frameworks: the Flemish inburgering, the Walloon parcours d'integration, the Brussels primo-arrivants programme, and the German-speaking Community's Dekret.

Appeal mechanism: Conseil d'Etat admin-chamber review (60-day deadline post-decision); naturalization refusal subject to procedural-deficiency review only - substantive parliamentary discretion (Article 13) NOT directly reviewable. Federal Mediator complaint route (~150 nationality complaints/year). Constitutional Court access for statutory challenges.

Sub-jurisdictional appeal architecture: Conseil d'État (Raad van State / Staatsrat) administrative chamber (60-day filing window post-notification); review limited to procedural-deficiency for parliamentary discretion (Art 13 CNB) but full substantive review for ministerial decisions (Art 12bis). Cour Constitutionnelle (Grondwettelijk Hof) for statutory challenges (Loi 6 jan 1989 framework). Cour de Cassation 1ère chambre for civil-law nationality determinations. Constitutional Court access via C.C. 122/2013 + 73/2014 framework for ancillary residence + integration challenges.

Appeals: refusals/oppositions appealable to the Tribunal de la famille (1ère instance); further appeal to the Cour d'appel and Cour de Cassation per C.C. 73/2014 + 122/2013 + 198/2014 — Cour Constitutionnelle nationality jurisprudence; Conseil d'État + Cour de Cassation apex review. Administrative-grievance pathway via Federal Mediator (Médiateur fédéral) — administrative-grievance anchor; DOFI (Direction Office des Étrangers) Vademecum operational guidance. Substantive merits review under Code de la nationalité belge (CNB) — Loi du 28 juin 1984 as