Tax IDs

Many countries use tax IDs (tax identification numbers or TINs) to identify taxpayers and facilitate the administration of their national tax affairs. 

In the US, a tax ID may be assigned by the Social Security Administration or by the Internal Revenue Service (IRS).

In the EU, tax ID specifications (structure, syntax, etc.) are set by the national authorities. Some countries even have a different tax ID structure for different categories of individuals (e.g. nationals and foreign residents). Check this page from the European Commission for more information. 

You can add tax IDs for your own business and for your customers: 

  • You can add your tax IDs in Settings > Tax IDs so that they are included on your invoices. 
  • You can add a tax ID for your customer in their contact file in Contacts.

Quaderno can automatically verify:

When one of these numbers is provided, Quaderno automatically checks the validity of number with the respective tax authority. You’ll see the tax ID status in the contact’s file:

  • Verified: The tax ID has been verified via one of the databases listed above.
  • Unavailable: For technical reasons, the databases listed above were not available when Quaderno tried to verify the tax ID. For customers outside the EU, Australia, and New Zealand, tax IDs will always have this status.
  • Unverified: If Quaderno tried to verify the tax ID and it was invalid, it would appear as unverified.
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