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Belgium TIN validator
Check whether a Belgium NN / RRN follows the expected structure before you save it, send it to an API, or include it in a tax workflow.
Private by design
Your data stays in your browser
None of the TIN data you enter is ever saved to our servers — validation runs entirely on your device.
Validation Workspace
Validate NN / RRN
Enterprise checks for Belgium tax identification numbers.
Instant one-by-one format validation
How Belgium tax IDs are formatted
In Belgium, the tax identifier is commonly known as Numéro national / Rijksregisternummer (NN / RRN). The expected format is 11 digits (YY.MM.DD-XXX.XX) with mod-97 checksum. Teams usually need a Belgium NN / RRN check around tax filing, social security, healthcare, or before a record moves into billing, onboarding, or compliance review.
Valid examples
85.07.30-033.8400.01.01-001.79
Invalid examples
- 85.07.30-033.85 (Invalid checksum)
- 85.07.30-033 (Incomplete)
What this validator checks
Format and length
Confirms the number follows the expected Belgium pattern: 11 digits (YY.MM.DD-XXX.XX) with mod-97 checksum.
Checksum logic
Runs the checksum rule used by Belgium when the public format includes one, helping catch typos that still look correctly formatted.
Useful examples
Shows valid and invalid-looking samples so you can compare spacing, separators, letters, and digit counts before submitting real data.
When people usually check this number
- Tax filing
- Social security
- Healthcare
- Employment
A format match does not prove that a Belgium tax ID belongs to a specific person or business. Use the result as a first-pass data quality check, then confirm sensitive cases with official records.
Official source: SPF Finances
Last reviewed: May 23, 2026. We update country guidance when public format rules change.
How to check a Belgium NN / RRN
Use this check before a record reaches billing, tax reporting, or manual review.
Enter the NN / RRN
Paste or type the Belgium tax identifier exactly as it appears in your source record. Spaces and separators are fine when they are part of the expected format.
Review the format result
Check whether the number matches the known Belgium structure, including length, separators, letters, and checksum rules where public guidance includes them.
Confirm important records
For onboarding, tax reporting, or compliance work, treat the result as a data-quality signal and confirm high-risk records with SPF Finances or your internal process.
Frequently asked questions
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