Electronic invoices provide an important means of reducing the costs of processing, sending, distributing and maintaining invoices, resulting in a simplification of administrative procedures and a considerable reduction in the amount of time and space consumed, as the invoices are transmitted through telematic means, accomplished by applying technical certification mechanisms (electronic signatures), which guarantee the basic elements required in any invoice (the authenticity of its origin and integrity of its content) and allow them to be maintained in digital format, which affords immediate access to them at any given moment.
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.