Citizenship in Belgium
Naturalisation timelines, tests, and dual nationality
Belgian nationality is commonly acquired after five years of lawful residence, through a declaration that also requires knowledge of one of the three national languages, evidence of social integration and evidence of economic participation. A longer route exists after ten years with lighter conditions, and Belgium permits dual nationality, so acquiring it does not by itself require renouncing an existing citizenship.
| Main route | Declaration of nationality after roughly five years of lawful residence source |
| Language | Knowledge of Dutch, French or German at roughly A2 level |
| Social integration | Integration course, qualifying diploma, vocational training or a sustained work record |
| Economic participation | Commonly evidenced by around 468 days of work over five years |
| Longer route | Declaration after roughly ten years, with lighter conditions |
| Dual nationality | Permitted under Belgian law |
The five-year declaration
The most used route requires lawful residence in Belgium for roughly five years on an unlimited or qualifying permit, knowledge of one national language at around A2 level, proof of social integration and proof of economic participation. The declaration is lodged with the registrar at the commune of residence, and the file passes to the public prosecutor, who may object within a set period.
The three conditions are cumulative. Applicants who speak the language fluently but cannot document the required working days, or who have a long work record but no accepted language certificate, are refused on the missing element rather than assessed in the round.
Proving each condition
- Language. Accepted evidence commonly includes an official language certificate at roughly A2, a diploma from a Belgian institution in one of the national languages, or completion of certain training in that language.
- Social integration. Commonly evidenced by completing the integration programme of the relevant Community, a Belgian diploma, recognised vocational training, or an extended record of uninterrupted work.
- Economic participation. Commonly evidenced by around 468 days of employment with social contributions paid over the preceding five years, or by an equivalent record of self-employment with contributions.
The ten-year route
After roughly ten years of lawful residence a declaration is available with lighter requirements: language knowledge and evidence of participation in the life of the host community, without the separate economic participation test used at five years. It exists precisely for people whose work history is thin — those who have raised children, retired, or worked outside the formal contribution system — and it is the route many long-settled residents actually use.
Fees, timing and dual nationality
A registration duty is payable when the declaration is lodged, commonly around EUR 150, in addition to the cost of assembling and translating the file. The prosecutor's examination period means the outcome typically arrives several months after lodging rather than immediately.
Belgium abolished the automatic loss of Belgian nationality on voluntary acquisition of another, and does not itself require renunciation of a previous nationality. Whether you keep your original citizenship therefore depends on the law of that other country, not on Belgian law.
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Official sources
Checked against these pages in September 2026. Fees and processing times change without notice — confirm before you act.