Alphanumeric invoice

An alphanumeric invoice is an invoice whose numbering consists of numbers, letters and other signs. Every invoice must have a serial or reference number in accordance with the invoicing regulations.

Do I need to use the alphanumeric invoice?

The Tax Agency only requires all invoices to be numbered, and the numbering must be correlative according to the date of creation. Alphanumeric invoices help to organise commercial documents and to extend the range of series of notes. In this way you can differentiate documents by customer or by fiscal year.

When is it necessary to use an alphanumeric invoice?

According to tax regulations, it is compulsory to use alphanumeric invoices in the following cases:

  • To differentiate the fiscal years of the company’s business activities.
  • When invoicing by recipient.
  • For judicial and administrative procedures.
  • To differentiate between different points of sale.
  • For credit or proforma invoices.

Recommendations of the Tax Agency for the numbering of invoices

  • Lower case letters should not be used.
  • The symbols to be used must be: middle dash “-“, full stop”, slash “/” and underscore “_”.
  • Do not use blank spaces at the beginning of the invoice.
  • No more than 30 characters in serial numbers is recommended.
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