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🔧 SIREN to VAT Number Converter

Enter a 9-digit French SIREN number to instantly get the corresponding French intra-community VAT number (numéro de TVA intracommunautaire).

🇫🇷 This tool works for France only. Every EU country has its own VAT number format and calculation rule, so this converter cannot be used for other countries.

SIREN Number
VAT Number

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About the SIREN to VAT Number Converter

This tool converts a French SIREN number (the 9-digit identifier assigned by INSEE to every company registered in France) into its official French intra-community VAT number (numéro de TVA intracommunautaire, format FR XX 123456789).

The French VAT number is derived from the SIREN using a standard checksum formula defined by the French tax administration, so it can be computed instantly without any lookup or external service.

Note: this conversion formula is specific to France. Every EU member state has its own VAT number format and its own calculation rule, so this tool cannot be used to derive VAT numbers for other countries.

Key Features

  • Instant conversion: Get the VAT number as soon as you type a valid SIREN
  • Format validation: Checks that the SIREN contains exactly 9 digits
  • Official formula: Uses the standard modulo-97 checksum used by the French tax authorities
  • Fully offline: Runs entirely in your browser, no data ever leaves your device

How to Use the Tool

  • Step 1: Enter a 9-digit SIREN number in the input field
  • Step 2: Click "Convert" (or the result updates automatically)
  • Step 3: Copy the generated VAT number with the 📋 button

Common Use Cases

  • Accountants and bookkeepers preparing invoices for French clients
  • Freelancers and business owners checking their own VAT number
  • Developers validating or generating VAT numbers for French entities in software
  • Anyone needing to quickly cross-check a SIREN against a VAT number

Tips & Best Practices

  • The SIREN must contain exactly 9 digits, with no spaces or letters
  • This tool calculates the VAT number mathematically from the SIREN; it does not verify that the SIREN itself corresponds to an existing, active company
  • To check whether a company is currently registered, use an official source such as the INSEE Sirene directory

Privacy & Security

Everything happens locally in your browser. The SIREN number you enter is never sent to any server, stored, or tracked.