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CertiDocsThe practical guide

Belgian nationality as the parent of a Belgian child

This declaration requires, among other conditions, five years of legal residence, knowledge of a national language and social integration. The category covers the spouse of a Belgian after three years of living together in Belgium, or the parent/adopter of a Belgian child meeting the statutory age condition. FPS Justice states that proof of social integration also proves language knowledge. Have your municipality check the conditions and supporting documents for your category.

Understand the process
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What is the right legal basis?

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This declaration requires, among other conditions, five years of legal residence, knowledge of a national language and social integration. The category covers the spouse of a Belgian after three years of living together in Belgium, or the parent/adopter of a Belgian child meeting the statutory age condition. FPS Justice states that proof of social integration also proves language knowledge. Have your municipality check the conditions and supporting documents for your category.

Official sourceFPS Justice - Declaration of nationality

Which order avoids waste?

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First verify exact eligibility for the category, then gather the parent's and child's records, authenticate foreign records where needed, and then translate the useful ones. Ordering translations before locking down the parental link and the child's Belgian status just makes life harder.

What amount should you budget?

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As checked on 3 October 2026, FPS Finance lists a standard duty of €1,030. Confirm the amount for your procedure before paying; attribution of nationality to minors is free. Translation and any municipal charges are separate budget items.

Official sourceFPS Finance - Nationality registration duty and payment evidence

Documents to prepare

  • Proof of the required legal stay in Belgium
  • Birth certificate of the Belgian child and records clearly showing parentage or adoption
  • Proof that the child is Belgian, and that identities are consistent across the records
  • Proof of social integration under the applicable official route
  • Check exemptions and accepted languages for the requested records. Apostille or legalisation of the original only if required; sworn translation only if requested, with its formalities checked separately.

Steps to follow

  1. Check eligibility

    Confirm the five years of legal stay and that the Belgian child really falls within the targeted category.

  2. Gather parent and child records

    Prepare the records proving parentage, the child's Belgian nationality and consistent identities.

  3. Authenticate and then translate

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

  4. File with the municipality

    File a complete dossier to obtain the receipt that starts the opinion deadline.

Good to know

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Frequently asked questions

+Is having a Belgian child enough on its own?
This declaration requires, among other conditions, five years of legal residence, knowledge of a national language and social integration. The category covers the spouse of a Belgian after three years of living together in Belgium, or the parent/adopter of a Belgian child meeting the statutory age condition. FPS Justice states that proof of social integration also proves language knowledge. Have your municipality check the conditions and supporting documents for your category.
+Is this the same route as the spouse-of-a-Belgian route?
No. FPS Justice places both under the declaration of nationality, but the anchoring proof is different.
+Does the child's birth certificate always need translation?
Yes if a foreign record is needed and the municipality cannot use it directly. But handle apostille or legalisation first where required.
+What happens if the prosecutor does not answer?
FPS Justice says that after four months without an opinion, the opinion is deemed positive, and the nationality act may be drawn up.
+Why do identities need to be so consistent between parent and child?
Because the entire category rests on that link. If names, dates or transliterations diverge, you weaken the very foundation of the file.

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 - NaturalisationOfficial sourceFPS Finance - Nationality registration duty and payment evidence

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