How to get Belgian citizenship in 2025 — naturalisation, marriage & descent

Belgian citizenship in 2025 provides full rights within Belgium and the European Union, including free movement, voting rights, and access to social benefits. Compared to residence, citizenship requires proof of integration, language proficiency, and in some cases a longer residence period. This guide covers naturalisation, marriage, and descent, along with recent 2025 changes.

Key terms to understand

• Belgian Nationality Code — the main law regulating citizenship procedures.
• Commune (municipality) — local authority where applications are filed.
• Naturalisation (ordinary) — procedure requiring 5 or 10 years of residence depending on integration.
• Facilitated naturalisation — shorter path for spouses of Belgian citizens.
• Descent (jus sanguinis) — automatic citizenship for children of Belgian parents.
• Integration requirements — proof of language, work, or education in Belgium.

Routes to Belgian citizenship

Belgian law recognizes three main pathways to nationality:

Step-by-step ordinary naturalisation in 2025

1. Reside legally in Belgium for at least 5 years with integration proof (work, studies, or community participation).
2. Obtain a residence card B or C before applying.
3. Submit application to your commune with supporting documents.
4. Provide language certificates (Dutch, French, or German — A2 minimum).
5. Commune forwards application to the public prosecutor and court for review.
6. Final decision registered in the civil registry.

Marriage-based facilitated naturalisation

1. Be legally married to a Belgian citizen for at least 3 years.
2. Prove cohabitation in Belgium for at least 6 months.
3. Provide marriage certificate and commune registration.
4. Show proof of integration: language skills and stable financial situation.
5. Submit application at the commune; decision follows legal review.

Citizenship by descent

Children born to at least one Belgian parent automatically acquire citizenship. If the child is born abroad, registration with the Belgian consulate before age 18 is required. In 2025, the process has been simplified through digital consular registration systems.

Documents checklist

• Valid passport and residence card (B or C)
• Birth certificate
• Marriage certificate (if applicable)
• Language certificate in Dutch, French, or German (A2 level)
• Proof of integration: employment, studies, or social participation
• Police clearance certificate
• Tax records and proof of stable income

Costs and timelines

Application fees range between €150 and €500 depending on commune. Processing time is typically 12–24 months. Facilitated cases are faster (6–12 months). Citizenship by descent is nearly immediate once documents are validated.

Integration and language requirements

Applicants must prove integration through one of the following: paid employment, professional activity, completion of studies in Belgium, or community participation. Language requirements are set at A2 in one of the national languages — Dutch, French, or German. Interviews may be conducted to confirm integration.

What changed in 2025

• Language exams now standardized nationwide, reducing commune discrepancies.
• Integration certificates must be issued by recognized institutions only.
• Digital applications available in major cities including Brussels, Antwerp, and Liège.
• Facilitated naturalisation applicants now subject to stricter fraud checks.

Common mistakes to avoid

• Confusing the 5-year rule (with integration) and 10-year rule (without integration).
• Submitting outdated language certificates not recognized by federal authorities.
• Failing to register marriage or cohabitation with the commune.
• Not maintaining continuous residence before application.

FAQ about Belgian citizenship

• How many years of residence are needed for Belgian citizenship? 5 years with integration, or 10 years without.
• Can I apply through marriage? Yes, after 3 years of marriage and cohabitation with a Belgian citizen.
• Is dual citizenship allowed? Yes, Belgium generally allows dual nationality.
• Do I need a language certificate? Yes, A2 in Dutch, French, or German is required.
• Can children born abroad gain Belgian citizenship? Yes, if registered with the Belgian consulate before age 18.

Expert opinion

“Belgian citizenship in 2025 rewards integration and language skills. Ordinary naturalisation remains strict, but marriage and descent provide clear alternative routes.” — VelesClub Int. Immigration Team

Next steps

Explore our platform and check the Residency & Citizenship hub for detailed guides. Visit our main page or go directly to the Residency & Citizenship hub.