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.
Itemized List of Services _ must be specific People want to know what they've paid for. Most people will not pay for something described merely as "Design." Tell them exactly what they have received: e.g. "Design of three_page static website for Sporting Goods Department." Be as specific as possible. In five years, would both you and the client know what you meant by your description? Also, specify whether the charge is project_based or hourly. Include Your Terms _ must be clear When do you expect the client to pay you? What happens if they miss the deadline? To be able to send follow_up or overdue notices or to charge interest, you need a rock_solid paper trail that no one can argue with.