Recouvrement de la nationalité belge (Article 24 CNB)

Recouvrement de la nationalité belge (Article 24 CNB) is the pathway by which a former Belgian recovers Belgian nationality after having lost it. It is available to ex-Belgians who lost their nationality — for example, those who lost it before 2008 through the voluntary acquisition of a foreign nationality, which at that time triggered automatic loss (ex lege) under the pre-reform Article 22 §1 of the Code de la nationalité belge (CNB). The Loi du 27 décembre 2006, effective 28 April 2008, lifted this rule, so that a Belgian who acquires another nationality after age 18 now retains Belgian nationality (Article 8 §2 CNB). The recovery route under Article 24 §1 CNB operates within this post-2008 framework, and its availability was confirmed by the Cour de cassation (Cass. 1ère ch., 13 décembre 2018).

Recovery is initiated by declaration. The applicant files a declaration at the municipal civil-status office (Officier de l'état civil, Article 12bis) or with the Office des Étrangers (Article 13). The Procureur du Roi issues an advisory opinion within 60 days, after which a ministerial or parliamentary decision is taken; on a positive outcome the National Register is updated. Adverse decisions may be challenged before the administrative chamber of the Conseil d'État within 60 days.

Belgian nationality is an exclusive federal competence (Constitution Art. 8) and is governed by the Code de la nationalité belge (Loi du 28 juin 1984, M.B. 12 juillet 1984), as subsequently amended. The route is operative across Belgium's three language regions (French, Dutch and German).

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 RST 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 Article 24 CNB; Article 24 CNB recouvrement track: prior-loss documentation (decree publication / foreign-naturalization decree), declaration to municipal civil registrar, residence in Belgium required at time of declaration (12-month minimum); Holocaust-restoration specific framework via dedicated Loi declaration pathway. 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 (Article 24 recouvrement: 6-12 months; collaboration restoration: TBD pending parliamentary action; Holocaust reparation: limited path).

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 operative provision is Article 24 CNB, which establishes recovery of nationality (recouvrement) for former Belgians who lost their nationality — typically those who, before 2008, lost it automatically through the voluntary acquisition of a foreign nationality. Recovery is effected by a declaration before the civil-status registrar, and Article 24 requires a period of 12 months' Belgian residence together with the restoration declaration.

The 2008 dual-nationality reform

Before 2008, Article 22 §1 CNB provided for automatic loss of Belgian nationality (ex lege) where a Belgian national voluntarily acquired a foreign nationality. The Loi du 27 décembre 2006 removed this automatic-loss rule with effect from 28 April 2008, after which dual nationality became acceptable in Belgium. This reform is the anchor for the recovery pathway: it lifted the automatic loss that had previously affected the persons now eligible to recover. Correspondingly, Article 8 §2 CNB confirms that, post-2008, a Belgian who acquires a foreign nationality after the age of 18 retains Belgian nationality.

Key jurisprudence

The Cour de cassation, 1ère chambre, 13 décembre 2018 (Cass. C.18.0123) confirmed the availability of recovery for ex-Belgians who lost their nationality before 2008 through automatic foreign-acquisition, and held that recouvrement is constitutive rather than declaratory in effect.

Procedural framework and competent authorities

Declarations are filed at the municipal civil-status office (Article 12bis CNB) or, where applicable, through the Office des Étrangers (Article 13 CNB). The Procureur du Roi issues an advisory opinion before the matter proceeds to ministerial or parliamentary decision, after which the National Register is updated on a positive outcome.

The broader CNB framework also reflects subsequent reforms, including the Loi du 4 décembre 2012 (introducing the integration-based naturalisation regime) and the Loi du 18 juin 2024, which codifies in Belgian law the EU-law proportionality assessment for nationality loss developed by the Court of Justice of the European Union in Tjebbes (C-221/17) and Rottmann (C-135/08). Regional integration requirements — Flemish inburgering, the Walloon parcours d'intégration, the Brussels primo-arrivants framework and the German-speaking Community Dekret — apply within the competence-allocation structure of Article 12bis.

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.

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 amended by Loi du 4 décembre 2012 — CNN regime (5-year continuous integration pathway; replaced declaration regime).