Related documents
Marriage certificate, Birth certificate, Criminal record extract, Residence permit, Diploma
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.
Official fees + translation if needed4 months after receipt if the file is completeComplex
Last reviewed: 29 March 2026Editorial review: Equipe CertiDocsOfficial sources: 3
Overview
What this guide helps you sort out
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.
Steps
4
Documents
5
Official sources
3
What frames this file straight away
Before you even follow the procedure step by step, these are usually the axes that matter.
Common translations
Arabic-French, Turkish-French, Romanian-French, Russian-French, Portuguese-French
Related cities
Brussels, Antwerp, Liège
What the authority will really test here
In this kind of file, the blockage usually comes from proof, sequencing and consistency, not polished wording.
Records that need to line up
This procedure is usually read through Marriage certificate, Birth certificate, Criminal record extract. Names, dates and references need to stay aligned from one record to the next.
Which official reading matters
Brussels, Antwerp will compare the source record with Arabic-French, Turkish-French and wants the issuing authority, date and registry references to be easy to spot.
Order of formalities
The 3 official sources mainly help keep the sequence sharp: recent record first, any apostille or legalisation next, then the right filing step.
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 moment to gamble on fuzzy 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.
Good to know
Marriage to a Belgian != naturalisation
Naturalisation exists, but it is almost never the right first box for this situation. If your story starts with 'I am married to a Belgian', you should think declaration of nationality first.
Marriage alone is not enough
FPS Justice looks for a clear bundle: five years of legal stay, three years of life together in Belgium and proof of social integration. A nice marriage certificate without the rest will not get the file off the ground.
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Get matchedFrequently 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 sources
The links below provide the official baseline. They help verify the procedure but do not replace file-specific analysis or the decision of the competent authority.
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