Are you a foreigner living and working in Spain? Then you are sure to come across the número de soporte. This number is important for all kinds of official matters, such as filing your tax return. In this article, we explain in a simple way what the número de soporte is and where to find it.

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What is the número de soporte?

In Spain, as a foreigner, you have an NIE (Número de Identidad de Extranjero). This is your unique identification number. The número de soporte is a special number used by the tax authorities and other agencies to confirm your identity. It usually consists of 8 digits and is not the same as your regular NIE number. Think of it as an extra checkpoint that ensures that all your administrative matters run smoothly.

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Where can you find the número de soporte?

Depending on the document you have, the number may be in different places. Below we briefly explain where to look:

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TIE - Tarjeta de Identidad de Extranjero (for non-EU citizens).

• ‍Where: At the top right of the TIE card.‍
  
• How: The número de soporte starts with the letter E and consists of 8 digits.‍
  
• Tip: If the number is not fully 8 digits, add zeros to the left.‍
  
• Example: If your number is E654321, enter E00654321.
  

Border worker card

• ‍Where: Also on this card, you'll find the número de soporte on the top right.‍
  
• How: It works just like the TIE: an E followed by 8 digits (complete with zeros if necessary).
  

Registration certificate for EU citizens.

• ‍Where: This number is on the back of the certificate.
  
• ‍How: In official acts add the letter C before the number.‍
  
• Example: If your number is 1234567, use C01234567.‍
  
• Note: On some older certificates (folio format, for example), the number is on the front, in the upper right corner.
  

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Why is this number important?
The número de soporte is essential because it helps you prove your identity quickly and clearly to the IRS and other authorities. Whether you want to file a tax return, open a bank account or arrange other official business, this number makes it all a lot easier.