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.
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)
Thank Them, and Ask Them to Thank You _ must be sincere Money is often a touchy subject, so politeness about it is a good idea. Your clients are paying you money that they've earned with blood, sweat and tears, so let them know you appreciate it. You should also invite them to contact you if they have any questions and, more importantly, make it clear that you appreciate their present (and future) business. Some people also welcome testimonials; for example, by adding, "Let us know how we did. Write a testimonial and sent to... " If you're building your website's testimonials page or want to complete the feedback loop, this is a great way to get clients to give feedback on your work. If they have suggestions for making the process smoother, it's also a great opportunity for you to improve.