Format guidance · Verified checks when available
Belgium TIN validator
Review the expected Belgium NN / RRNstructure before you save it, send it to an API, or include it in a tax workflow. Interactive validation appears only after this country's rules pass authoritative-source verification.
Private by design
Transient validation, no public history
TINs are sent securely to the canonical validation API, processed in real time, and not persistently stored by the public checker.
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 page covers
Format details below are guidance from public sources. Automated pass/fail results are offered only when the backend catalog marks this country as verified syntax.
Format and length
Confirms the number follows the expected Belgium pattern: 11 digits (YY.MM.DD-XXX.XX) with mod-97 checksum.
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 Belgium syntax currently implemented here. The result does not query a tax-authority registry or confirm ownership.
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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