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Validate Belgium TIN (NN / RRN)

Free online Numéro national / Rijksregisternummer validator. Instant validation using OECD-compliant rules for Belgium tax identification numbers.

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Validate NN / RRN

Enterprise checks for Belgium tax identification numbers.

Instant one-by-one format validation

Country

Belgium

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NN / RRN format check

Enter a NN / RRN to validate for Belgium

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Paste values with or without separators. Validation also checks a normalized value.

Use a real NN / RRN sample to verify format compliance before filing.

About Belgium TIN (NN / RRN)

The Numéro national / Rijksregisternummer is the official tax identification number used in Belgium. Format: 11 digits (YY.MM.DD-XXX.XX) with mod-97 checksum

Valid Examples

  • 85.07.30-033.84
  • 00.01.01-001.79

Invalid Examples

  • 85.07.30-033.85 (Invalid checksum)
  • 85.07.30-033 (Incomplete)

Common Use Cases

  • Tax filing
  • Social security
  • Healthcare
  • Employment

Official source: SPF Finances

Frequently Asked Questions

What is the Numéro national?
The Numéro national (NN) or Rijksregisternummer (RRN) is Belgium's national registry number based on birth date. Format: YY.MM.DD-SSS.CC where CC is a mod-97 check.
How is the check number calculated?
The last 2 digits are calculated as 97 - (first 9 digits mod 97). For people born after 2000, the calculation uses '2' + first 9 digits.

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