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Belgian nationality as the spouse of a Belgian

If you are married to a Belgian, the real door is usually not parliamentary naturalisation. The normal route is a declaration of nationality, with five years of legal stay, three years of life together in Belgium and an integration file that actually holds up.

Understand the process
Last updated Editorial lead : Hiliyeh Bashir3 sources

What is the correct procedure?

For the spouse of a Belgian, the official FPS Justice page is clear: this is about a declaration of nationality, not default parliamentary naturalisation. Naturalisation remains an exceptional favour; if you meet the ordinary conditions, you are in declaration territory.

What does the municipality look at before forwarding the file?

The municipality checks completeness and admissibility: legal stay, marriage, life together in Belgium, social integration and readable official records. The file then goes for opinion to the public prosecutor, the Immigration Office and the State Security Service. This is not the stage to rely on unclear or incomplete documents.

Which order avoids rebuilding the file?

First verify actual eligibility, then gather the civil-status and integration records, obtain any necessary apostille or legalisation for foreign documents, and only after that translate the useful records. Translating before checking the exact category is the dumbest way to create waste.

Documents to prepare

  • Valid residence permit covering the required legal stay in Belgium
  • Marriage certificate and records proving life together in Belgium during the required period
  • Complete birth certificate and consistent identity records
  • Proof of social integration and, depending on the file, work or training records
  • Apostille or legalisation and then sworn translation of the necessary foreign documents

Steps to follow

  1. Verify eligibility

    Check the five years of legal stay, the three years of life together in Belgium and the applicable integration route.

  2. Gather the records and proof

    Prepare the marriage certificate, birth certificate, residence permits and proof of social integration.

  3. Authenticate and then translate

    Handle apostille or legalisation of foreign records before the sworn translation of the useful records.

  4. File with the municipality

    Submit a readable and complete file to obtain the receipt that triggers the opinion deadline.

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Frequently asked questions

+Is marriage to a Belgian enough on its own?
No. Marriage opens the correct category, but you still need the required legal stay, life together in Belgium and proof of social integration.
+Why not apply directly for naturalisation?
Because naturalisation is an exceptional favour. For the spouse of a Belgian who meets the ordinary conditions, the correct door is the declaration route.
+Is legal cohabitation enough for this guide?
No. This guide targets the route for the spouse married to a Belgian. Do not assume legal cohabitation automatically triggers the same category.
+When do you become Belgian if the prosecutor does not reply?
FPS Justice states that if no opinion is issued within four months after the receipt, the opinion is deemed positive and the nationality act is drawn up.
+Do foreign documents need translation before filing?
Yes if they are necessary for admissibility and the authority cannot use them directly. But handle apostille or legalisation first where required.

Official source

Official sources used

The references below are the public sources used to document this page. The competent authority always retains the final decision.

Official sourceFPS Justice - Declaration of nationalityOfficial sourceFPS Justice - Devenir belgeOfficial sourceFPS Justice - Naturalisation

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