Although we know perfectly well what an invoice is, its technical definition is "a document that reflects the delivery of a product or the provision of services, along with the due date and the amount to be paid in consideration." All invoices, regardless of the way in which they are sent (whether on paper or in electronic format), must include a series of mandatory fields. Article 6 of Royal Decree number 1496, Spanish law, which regulates the content of an invoice, establishes these fields as: Invoice number. Delivery date. Sender's and recipient's legal name. Sender's and recipient's Tax ID number. Sender's and recipient's legal address. Transaction description (tax base). Tax rate. Tax amount. Date of service (if different from the delivery date)
In order to comply with regulations and ensure that an electronic invoice has the same legal validity as a paper invoice, the corresponding electronic document must contain the same mandatory fields as any other invoice, must be signed with an electronic signature based on a recognized certificate and must be sent from one computer to another with the parties' mutual consent. This combination of factors provides a Telematic Invoice with sufficient reliability so as to indisputably guarantee its integrity and the authenticity of its origin.