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Reverse Tax Code Calculation

Decode information from an existing Tax Code

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The reverse calculation provides approximate information based on the tax code. Last name and first name may not be exact.

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This is some extra content

It will appear inside the main grid column, right below the calculator tool.

What can you discover?

👤 Surname consonants
✍️ Name consonants
⚧ Gender (Male/Female)
📅 Complete birth date
📍 Birth municipality and province
✅ Code validity

⚠️ Reverse calculation limitations

  • • Last name and first name cannot be determined with certainty
  • • The calculation only provides the extracted consonants
  • • The birth year may be ambiguous (1900 vs 2000)
  • • For official information, consult the Revenue Agency

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